

<!--XBRL Document Created with Wdesk from Workiva-->
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    <link:label id="lab_us-gaap_InventoryRawMaterials_464AA0A7EE0385FBC1F18FED570A1FEC_label_en-US" xlink:label="lab_us-gaap_InventoryRawMaterials_464AA0A7EE0385FBC1F18FED570A1FEC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Raw Materials, Gross</link:label>
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    <link:label id="lab_us-gaap_InventoryWorkInProcess_E4988E05A571745A8A6F8FED570A84AF_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryWorkInProcess_E4988E05A571745A8A6F8FED570A84AF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Work-in-process</link:label>
    <link:label id="lab_us-gaap_InventoryWorkInProcess_E4988E05A571745A8A6F8FED570A84AF_label_en-US" xlink:label="lab_us-gaap_InventoryWorkInProcess_E4988E05A571745A8A6F8FED570A84AF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Work in Process, Gross</link:label>
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    <link:label id="lab_us-gaap_InventoryFinishedGoods_5CCB684289B509AD98A98FED570B9289_label_en-US" xlink:label="lab_us-gaap_InventoryFinishedGoods_5CCB684289B509AD98A98FED570B9289" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Finished Goods, Gross</link:label>
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    <link:label id="lab_us-gaap_InventoryNet_B336731586369A2832DB8FED570B056A_label_en-US" xlink:label="lab_us-gaap_InventoryNet_B336731586369A2832DB8FED570B056A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Net</link:label>
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    <link:label id="lab_us-gaap_DebtDisclosureAbstract_72713241AAE2D68F8176B9265F3F0A14_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract_72713241AAE2D68F8176B9265F3F0A14" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_72713241AAE2D68F8176B9265F3F0A14" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtDisclosureAbstract_72713241AAE2D68F8176B9265F3F0A14" xlink:to="lab_us-gaap_DebtDisclosureAbstract_72713241AAE2D68F8176B9265F3F0A14" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtDisclosureTextBlock_9115B1123CC9790338E2B9265F3FF44B_terseLabel_en-US" xlink:label="lab_us-gaap_DebtDisclosureTextBlock_9115B1123CC9790338E2B9265F3FF44B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt</link:label>
    <link:label id="lab_us-gaap_DebtDisclosureTextBlock_9115B1123CC9790338E2B9265F3FF44B_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureTextBlock_9115B1123CC9790338E2B9265F3FF44B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Disclosure [Text Block]</link:label>
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    <link:label id="lab_us-gaap_WarrantsAndRightsNoteDisclosureAbstract_1A7A48456BAE6CD62A2C95A6CEC1AB90_label_en-US" xlink:label="lab_us-gaap_WarrantsAndRightsNoteDisclosureAbstract_1A7A48456BAE6CD62A2C95A6CEC1AB90" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrants and Rights Note Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_WarrantsAndRightsNoteDisclosureAbstract" xlink:label="loc_us-gaap_WarrantsAndRightsNoteDisclosureAbstract_1A7A48456BAE6CD62A2C95A6CEC1AB90" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ClassOfWarrantOrRightTable_F9C67376F9F19BFE058A95A6CEC1BEF6_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightTable_F9C67376F9F19BFE058A95A6CEC1BEF6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Table]</link:label>
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightTable_F9C67376F9F19BFE058A95A6CEC1BEF6_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightTable_F9C67376F9F19BFE058A95A6CEC1BEF6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ClassOfWarrantOrRightTable" xlink:label="loc_us-gaap_ClassOfWarrantOrRightTable_F9C67376F9F19BFE058A95A6CEC1BEF6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_F9C67376F9F19BFE058A95A6CEC1BEF6" xlink:to="lab_us-gaap_ClassOfWarrantOrRightTable_F9C67376F9F19BFE058A95A6CEC1BEF6" xlink:type="arc" />
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightAxis_C550D89EFD33CE43288895A6CEC1362D_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightAxis_C550D89EFD33CE43288895A6CEC1362D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Axis]</link:label>
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightAxis_C550D89EFD33CE43288895A6CEC1362D_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightAxis_C550D89EFD33CE43288895A6CEC1362D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Axis]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_C550D89EFD33CE43288895A6CEC1362D" xlink:to="lab_us-gaap_ClassOfWarrantOrRightAxis_C550D89EFD33CE43288895A6CEC1362D" xlink:type="arc" />
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    <link:label id="lab_us-gaap_ClassOfWarrantOrRightDomain_4DA62EAA5746BCCCE83B95A6CEC11716_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightDomain_4DA62EAA5746BCCCE83B95A6CEC11716" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_4DA62EAA5746BCCCE83B95A6CEC11716" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_4DA62EAA5746BCCCE83B95A6CEC11716" xlink:to="lab_us-gaap_ClassOfWarrantOrRightDomain_4DA62EAA5746BCCCE83B95A6CEC11716" xlink:type="arc" />
    <link:label id="lab_astm_WarrantsIssuedInAugust2013Member_57E4CC16DF208BB7B75595A6CEC1EFB6_terseLabel_en-US" xlink:label="lab_astm_WarrantsIssuedInAugust2013Member_57E4CC16DF208BB7B75595A6CEC1EFB6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">August 2013 warrants</link:label>
    <link:label id="lab_astm_WarrantsIssuedInAugust2013Member_57E4CC16DF208BB7B75595A6CEC1EFB6_label_en-US" xlink:label="lab_astm_WarrantsIssuedInAugust2013Member_57E4CC16DF208BB7B75595A6CEC1EFB6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrants Issued In August2013 [Member]</link:label>
    <link:label id="lab_astm_WarrantsIssuedInAugust2013Member_57E4CC16DF208BB7B75595A6CEC1EFB6_documentation_en-US" xlink:label="lab_astm_WarrantsIssuedInAugust2013Member_57E4CC16DF208BB7B75595A6CEC1EFB6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the warrants issued by the entity in August 2013.</link:label>
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    <link:label id="lab_astm_WarrantsIssuedInSeptember2022Member_E29385827BA1E2E7ECB695A6CEC1FCA7_terseLabel_en-US" xlink:label="lab_astm_WarrantsIssuedInSeptember2022Member_E29385827BA1E2E7ECB695A6CEC1FCA7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">September 2022 Warrants</link:label>
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    <link:label id="lab_astm_WarrantsIssuedInSeptember2016Member_82E53D733C179B27729895A6CEC1E666_terseLabel_en-US" xlink:label="lab_astm_WarrantsIssuedInSeptember2016Member_82E53D733C179B27729895A6CEC1E666" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">September 2016 Warrants</link:label>
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    <link:label id="lab_us-gaap_RangeAxis_6BA1EDE429258A14325895BECC5BA9B3_label_en-US" xlink:label="lab_us-gaap_RangeAxis_6BA1EDE429258A14325895BECC5BA9B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range [Axis]</link:label>
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    <link:label id="lab_us-gaap_RightsMember_49683743C88F3A963C4495BECC5B2E47_terseLabel_en-US" xlink:label="lab_us-gaap_RightsMember_49683743C88F3A963C4495BECC5B2E47" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Series A Junior Participating Cumulative Preferred Stock</link:label>
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    <link:label id="lab_astm_ClassOfWarrantOrRightNumberOfRightsDeemedToBeDeliveredPerCommonStockShareIssuedOrTransferred_046E06E5F3EFB1C5DA8395BECC5BF87A_label_en-US" xlink:label="lab_astm_ClassOfWarrantOrRightNumberOfRightsDeemedToBeDeliveredPerCommonStockShareIssuedOrTransferred_046E06E5F3EFB1C5DA8395BECC5BF87A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right Number of Rights Deemed to be Delivered Per Common Stock Share Issued or Transferred</link:label>
    <link:label id="lab_astm_ClassOfWarrantOrRightNumberOfRightsDeemedToBeDeliveredPerCommonStockShareIssuedOrTransferred_046E06E5F3EFB1C5DA8395BECC5BF87A_documentation_en-US" xlink:label="lab_astm_ClassOfWarrantOrRightNumberOfRightsDeemedToBeDeliveredPerCommonStockShareIssuedOrTransferred_046E06E5F3EFB1C5DA8395BECC5BF87A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of rights deemed to be delivered for each share of common stock issued or transferred by the entity.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_ClassOfWarrantOrRightNumberOfRightsDeemedToBeDeliveredPerCommonStockShareIssuedOrTransferred" xlink:label="loc_astm_ClassOfWarrantOrRightNumberOfRightsDeemedToBeDeliveredPerCommonStockShareIssuedOrTransferred_046E06E5F3EFB1C5DA8395BECC5BF87A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PreferredStockSharesAuthorized_FEC9759EA34A9A085A2295BECC5B8266_verboseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockSharesAuthorized_FEC9759EA34A9A085A2295BECC5B8266" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Preferred stock, shares authorized (in shares)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_FEC9759EA34A9A085A2295BECC5B8266" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PreferredStockSharesIssued_004D33C95440005E7B2395BECC5C3C43_label_en-US" xlink:label="lab_us-gaap_PreferredStockSharesIssued_004D33C95440005E7B2395BECC5C3C43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock, Shares Issued</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaap_PreferredStockSharesIssued_004D33C95440005E7B2395BECC5C3C43" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_8DF264A808019FA8F0A595DEE75AF01A" xlink:type="locator" />
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    <link:label id="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired_DC8256E7880D1999D48E95BECC5C0409_terseLabel_en-US" xlink:label="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired_DC8256E7880D1999D48E95BECC5C0409" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of common stock to be acquired for rights to be exercisable by an individual or group</link:label>
    <link:label id="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired_DC8256E7880D1999D48E95BECC5C0409_label_en-US" xlink:label="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired_DC8256E7880D1999D48E95BECC5C0409" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right, Condition on Exercise of Rights Percentage of Common Stock Acquired</link:label>
    <link:label id="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired_DC8256E7880D1999D48E95BECC5C0409_documentation_en-US" xlink:label="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired_DC8256E7880D1999D48E95BECC5C0409" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the percentage of the entity's outstanding common stock that must be acquired for rights to become exercisable by an individual or group.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired" xlink:label="loc_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired_DC8256E7880D1999D48E95BECC5C0409" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired_DC8256E7880D1999D48E95BECC5C0409" xlink:to="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockAcquired_DC8256E7880D1999D48E95BECC5C0409" xlink:type="arc" />
    <link:label id="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockOwnedByPersonOrGroupCommencingTenderOffer_0E221D9AEB71C84DB0D795BECC5C610D_terseLabel_en-US" xlink:label="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockOwnedByPersonOrGroupCommencingTenderOffer_0E221D9AEB71C84DB0D795BECC5C610D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of common stock to be owned for rights to be exercisable by an individual or group commencing a tender offer</link:label>
    <link:label id="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockOwnedByPersonOrGroupCommencingTenderOffer_0E221D9AEB71C84DB0D795BECC5C610D_label_en-US" xlink:label="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockOwnedByPersonOrGroupCommencingTenderOffer_0E221D9AEB71C84DB0D795BECC5C610D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right, Condition on Exercise of Rights, Percentage of Common Stock Owned by Person or Group Commencing Tender Offer</link:label>
    <link:label id="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockOwnedByPersonOrGroupCommencingTenderOffer_0E221D9AEB71C84DB0D795BECC5C610D_documentation_en-US" xlink:label="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockOwnedByPersonOrGroupCommencingTenderOffer_0E221D9AEB71C84DB0D795BECC5C610D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the percentage of the entity's outstanding common stock that must be owned for rights to become exercisable by an individual or group commencing a tender offer.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockOwnedByPersonOrGroupCommencingTenderOffer" xlink:label="loc_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockOwnedByPersonOrGroupCommencingTenderOffer_0E221D9AEB71C84DB0D795BECC5C610D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockOwnedByPersonOrGroupCommencingTenderOffer_0E221D9AEB71C84DB0D795BECC5C610D" xlink:to="lab_astm_ClassOfWarrantOrRightConditionOnExerciseOfRightsPercentageOfCommonStockOwnedByPersonOrGroupCommencingTenderOffer_0E221D9AEB71C84DB0D795BECC5C610D" xlink:type="arc" />
    <link:label id="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValue_A18F138856918D827D2495BECC5CEA06_terseLabel_en-US" xlink:label="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValue_A18F138856918D827D2495BECC5CEA06" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Multiple of the value of common stock acquired (after conversion from preferred) to the exercise price of stock purchase right in the event of an acquiring person event</link:label>
    <link:label id="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValue_A18F138856918D827D2495BECC5CEA06_label_en-US" xlink:label="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValue_A18F138856918D827D2495BECC5CEA06" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Right Condition on Exercise of Rights Number of Multiples of Exercise Price Holder Can Receive in Common Stock Value</link:label>
    <link:label id="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValue_A18F138856918D827D2495BECC5CEA06_documentation_en-US" xlink:label="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValue_A18F138856918D827D2495BECC5CEA06" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of multiples of the exercise price of the right that the right holder will receive in value of the entity's common stock when an acquiring person event occurs.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValue" xlink:label="loc_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValue_A18F138856918D827D2495BECC5CEA06" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValue_A18F138856918D827D2495BECC5CEA06" xlink:to="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValue_A18F138856918D827D2495BECC5CEA06" xlink:type="arc" />
    <link:label id="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValueInEventOfMerger_027D82AE8D0B18A2E55695BECC5CD5E2_terseLabel_en-US" xlink:label="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValueInEventOfMerger_027D82AE8D0B18A2E55695BECC5CD5E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Multiple of the value of common stock acquired to the exercise price of stock purchase right in the event of a merger of the entity</link:label>
    <link:label id="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValueInEventOfMerger_027D82AE8D0B18A2E55695BECC5CD5E2_label_en-US" xlink:label="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValueInEventOfMerger_027D82AE8D0B18A2E55695BECC5CD5E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Right Condition on Exercise of Rights Number of Multiples of Exercise Price Holder Can Receive in Common Stock Value in Event of Merger</link:label>
    <link:label id="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValueInEventOfMerger_027D82AE8D0B18A2E55695BECC5CD5E2_documentation_en-US" xlink:label="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValueInEventOfMerger_027D82AE8D0B18A2E55695BECC5CD5E2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of multiples of the exercise price of the right that the right holder will receive in value of the entity's common stock when a merger of the entity occurs.</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValueInEventOfMerger_027D82AE8D0B18A2E55695BECC5CD5E2" xlink:to="lab_astm_ClassOfRightConditionOnExerciseOfRightsNumberOfMultiplesOfExercisePriceHolderCanReceiveInCommonStockValueInEventOfMerger_027D82AE8D0B18A2E55695BECC5CD5E2" xlink:type="arc" />
    <link:label id="lab_astm_ClassOfWarrantOrRightsRedemptionPricePerRight_BC612754596C618EF22595BECC5C7C0F_terseLabel_en-US" xlink:label="lab_astm_ClassOfWarrantOrRightsRedemptionPricePerRight_BC612754596C618EF22595BECC5C7C0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Redemption price per right (in dollars per right)</link:label>
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    <link:label id="lab_us-gaap_ClassOfStockDomain_88BC70E6B233CF7811F595A0E36F28D8_label_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain_88BC70E6B233CF7811F595A0E36F28D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Stock [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_88BC70E6B233CF7811F595A0E36F28D8" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CommonClassAMember_DE874AFD3AB74D796E3A95A0E36F6869_label_en-US" xlink:label="lab_us-gaap_CommonClassAMember_DE874AFD3AB74D796E3A95A0E36F6869" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Class A [Member]</link:label>
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    <link:label id="lab_us-gaap_SeriesAPreferredStockMember_0DFE20F4F3A4DABC776E95A0E36F85AD_label_en-US" xlink:label="lab_us-gaap_SeriesAPreferredStockMember_0DFE20F4F3A4DABC776E95A0E36F85AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Series A Preferred Stock [Member]</link:label>
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    <link:label id="lab_us-gaap_ClassOfStockLineItems_93C416A9E04D150AD21495A0E36F23D0_label_en-US" xlink:label="lab_us-gaap_ClassOfStockLineItems_93C416A9E04D150AD21495A0E36F23D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Stock [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ClassOfStockLineItems" xlink:label="loc_us-gaap_ClassOfStockLineItems_93C416A9E04D150AD21495A0E36F23D0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfStockLineItems_93C416A9E04D150AD21495A0E36F23D0" xlink:to="lab_us-gaap_ClassOfStockLineItems_93C416A9E04D150AD21495A0E36F23D0" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProceedsFromWarrantExercises" xlink:label="loc_us-gaap_ProceedsFromWarrantExercises_05860BBFFC27C461875A95A0E3701644" xlink:type="locator" />
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    <link:label id="lab_astm_ValueOfSharesOfCommonStockToBeSold_166D4B885D9E34E3693995A0E370654E_terseLabel_en-US" xlink:label="lab_astm_ValueOfSharesOfCommonStockToBeSold_166D4B885D9E34E3693995A0E370654E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Value of shares of common stock to be sold</link:label>
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    <link:label id="lab_astm_PeriodOverWhichSharesOfCommonStockToBePurchased_F2D572EA27B7BC29FA9995A0E370F65C_documentation_en-US" xlink:label="lab_astm_PeriodOverWhichSharesOfCommonStockToBePurchased_F2D572EA27B7BC29FA9995A0E370F65C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the period over which shares of common stock to be purchased as per the purchase agreement entered into by the entity.</link:label>
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    <link:loc xlink:href="astm-20161231.xsd#astm_NumberOfSharesOfCommonStockToBePurchasedBasedOnClosingSalePriceOfCommonStock" xlink:label="loc_astm_NumberOfSharesOfCommonStockToBePurchasedBasedOnClosingSalePriceOfCommonStock_942E5AA436ED4D3B63B895A0E370FF95" xlink:type="locator" />
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    <link:label id="lab_astm_ThresholdClosingSalePriceOfCommonStockOnDateOfRegularPurchaseToTriggerAcceleratedPurchasesOfAdditionalCommonStock_0A2D22DEBE2CB3EF88B995A0E370F17A_terseLabel_en-US" xlink:label="lab_astm_ThresholdClosingSalePriceOfCommonStockOnDateOfRegularPurchaseToTriggerAcceleratedPurchasesOfAdditionalCommonStock_0A2D22DEBE2CB3EF88B995A0E370F17A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Threshold closing sale price of the common stock on the date of a regular purchase to trigger purchase of additional amounts as accelerated purchases (in dollars per share) (equals or exceeds)</link:label>
    <link:label id="lab_astm_ThresholdClosingSalePriceOfCommonStockOnDateOfRegularPurchaseToTriggerAcceleratedPurchasesOfAdditionalCommonStock_0A2D22DEBE2CB3EF88B995A0E370F17A_label_en-US" xlink:label="lab_astm_ThresholdClosingSalePriceOfCommonStockOnDateOfRegularPurchaseToTriggerAcceleratedPurchasesOfAdditionalCommonStock_0A2D22DEBE2CB3EF88B995A0E370F17A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Threshold Closing Sale Price of Common Stock on Date of Regular Purchase to Trigger Accelerated Purchases of Additional Common Stock</link:label>
    <link:label id="lab_astm_ThresholdClosingSalePriceOfCommonStockOnDateOfRegularPurchaseToTriggerAcceleratedPurchasesOfAdditionalCommonStock_0A2D22DEBE2CB3EF88B995A0E370F17A_documentation_en-US" xlink:label="lab_astm_ThresholdClosingSalePriceOfCommonStockOnDateOfRegularPurchaseToTriggerAcceleratedPurchasesOfAdditionalCommonStock_0A2D22DEBE2CB3EF88B995A0E370F17A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the threshold closing sale price of the common stock on the date of a regular purchase to trigger accelerated purchases of additional shares of common stock, if directed by the entity as per the purchase agreement.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_ThresholdClosingSalePriceOfCommonStockOnDateOfRegularPurchaseToTriggerAcceleratedPurchasesOfAdditionalCommonStock" xlink:label="loc_astm_ThresholdClosingSalePriceOfCommonStockOnDateOfRegularPurchaseToTriggerAcceleratedPurchasesOfAdditionalCommonStock_0A2D22DEBE2CB3EF88B995A0E370F17A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_ThresholdClosingSalePriceOfCommonStockOnDateOfRegularPurchaseToTriggerAcceleratedPurchasesOfAdditionalCommonStock_0A2D22DEBE2CB3EF88B995A0E370F17A" xlink:to="lab_astm_ThresholdClosingSalePriceOfCommonStockOnDateOfRegularPurchaseToTriggerAcceleratedPurchasesOfAdditionalCommonStock_0A2D22DEBE2CB3EF88B995A0E370F17A" xlink:type="arc" />
    <link:label id="lab_astm_PeriodOfBusinessDaysOverWhichPurchasePriceOfSharesOfCommonStockWillBeDetermined_810BF38297FF7313536595A0E3708B00_terseLabel_en-US" xlink:label="lab_astm_PeriodOfBusinessDaysOverWhichPurchasePriceOfSharesOfCommonStockWillBeDetermined_810BF38297FF7313536595A0E3708B00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Period of business days over which purchase price of shares of common stock will be determined</link:label>
    <link:label id="lab_astm_PeriodOfBusinessDaysOverWhichPurchasePriceOfSharesOfCommonStockWillBeDetermined_810BF38297FF7313536595A0E3708B00_label_en-US" xlink:label="lab_astm_PeriodOfBusinessDaysOverWhichPurchasePriceOfSharesOfCommonStockWillBeDetermined_810BF38297FF7313536595A0E3708B00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Period of Business Days over which Purchase Price of Shares of Common Stock will be Determined</link:label>
    <link:label id="lab_astm_PeriodOfBusinessDaysOverWhichPurchasePriceOfSharesOfCommonStockWillBeDetermined_810BF38297FF7313536595A0E3708B00_documentation_en-US" xlink:label="lab_astm_PeriodOfBusinessDaysOverWhichPurchasePriceOfSharesOfCommonStockWillBeDetermined_810BF38297FF7313536595A0E3708B00" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the period of business days over which purchase price of shares of common stock will be determined as per the purchase agreement entered into by the entity.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_PeriodOfBusinessDaysOverWhichPurchasePriceOfSharesOfCommonStockWillBeDetermined" xlink:label="loc_astm_PeriodOfBusinessDaysOverWhichPurchasePriceOfSharesOfCommonStockWillBeDetermined_810BF38297FF7313536595A0E3708B00" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_PeriodOfBusinessDaysOverWhichPurchasePriceOfSharesOfCommonStockWillBeDetermined_810BF38297FF7313536595A0E3708B00" xlink:to="lab_astm_PeriodOfBusinessDaysOverWhichPurchasePriceOfSharesOfCommonStockWillBeDetermined_810BF38297FF7313536595A0E3708B00" xlink:type="arc" />
    <link:label id="lab_astm_FloorPriceForSaleOfSharesOfCommonStock_61A7A567716A1CE26C8E95A0E3705444_terseLabel_en-US" xlink:label="lab_astm_FloorPriceForSaleOfSharesOfCommonStock_61A7A567716A1CE26C8E95A0E3705444" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Floor price for sale of shares of common stock (in dollars per share) (less than)</link:label>
    <link:label id="lab_astm_FloorPriceForSaleOfSharesOfCommonStock_61A7A567716A1CE26C8E95A0E3705444_label_en-US" xlink:label="lab_astm_FloorPriceForSaleOfSharesOfCommonStock_61A7A567716A1CE26C8E95A0E3705444" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Floor Price for Sale of Shares of Common Stock</link:label>
    <link:label id="lab_astm_FloorPriceForSaleOfSharesOfCommonStock_61A7A567716A1CE26C8E95A0E3705444_documentation_en-US" xlink:label="lab_astm_FloorPriceForSaleOfSharesOfCommonStock_61A7A567716A1CE26C8E95A0E3705444" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the floor price for the sale of shares of common stock as per the purchase agreement entered into by the entity.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_FloorPriceForSaleOfSharesOfCommonStock" xlink:label="loc_astm_FloorPriceForSaleOfSharesOfCommonStock_61A7A567716A1CE26C8E95A0E3705444" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_FloorPriceForSaleOfSharesOfCommonStock_61A7A567716A1CE26C8E95A0E3705444" xlink:to="lab_astm_FloorPriceForSaleOfSharesOfCommonStock_61A7A567716A1CE26C8E95A0E3705444" xlink:type="arc" />
    <link:label id="lab_astm_ThresholdOnPercentageOfOutstandingSharesOfCommonStockThatCanBeBeneficiallyOwnedByCounterparty_FB3AF4F0E5704878024595A0E3708C89_terseLabel_en-US" xlink:label="lab_astm_ThresholdOnPercentageOfOutstandingSharesOfCommonStockThatCanBeBeneficiallyOwnedByCounterparty_FB3AF4F0E5704878024595A0E3708C89" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Threshold on percentage of outstanding shares of the common stock that can be beneficially owned by counterparty</link:label>
    <link:label id="lab_astm_ThresholdOnPercentageOfOutstandingSharesOfCommonStockThatCanBeBeneficiallyOwnedByCounterparty_FB3AF4F0E5704878024595A0E3708C89_label_en-US" xlink:label="lab_astm_ThresholdOnPercentageOfOutstandingSharesOfCommonStockThatCanBeBeneficiallyOwnedByCounterparty_FB3AF4F0E5704878024595A0E3708C89" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Threshold on Percentage of Outstanding Shares of Common Stock that can be Beneficially Owned by Counterparty</link:label>
    <link:label id="lab_astm_ThresholdOnPercentageOfOutstandingSharesOfCommonStockThatCanBeBeneficiallyOwnedByCounterparty_FB3AF4F0E5704878024595A0E3708C89_documentation_en-US" xlink:label="lab_astm_ThresholdOnPercentageOfOutstandingSharesOfCommonStockThatCanBeBeneficiallyOwnedByCounterparty_FB3AF4F0E5704878024595A0E3708C89" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the threshold on percentage of outstanding shares of the common stock that can be beneficially owned by counterparty to the agreement.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_ThresholdOnPercentageOfOutstandingSharesOfCommonStockThatCanBeBeneficiallyOwnedByCounterparty" xlink:label="loc_astm_ThresholdOnPercentageOfOutstandingSharesOfCommonStockThatCanBeBeneficiallyOwnedByCounterparty_FB3AF4F0E5704878024595A0E3708C89" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_ThresholdOnPercentageOfOutstandingSharesOfCommonStockThatCanBeBeneficiallyOwnedByCounterparty_FB3AF4F0E5704878024595A0E3708C89" xlink:to="lab_astm_ThresholdOnPercentageOfOutstandingSharesOfCommonStockThatCanBeBeneficiallyOwnedByCounterparty_FB3AF4F0E5704878024595A0E3708C89" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockSharesIssued_1FF116A0E0DCC75D69D895A0E3705224_positiveLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_1FF116A0E0DCC75D69D895A0E3705224" xlink:role="http://www.xbrl.org/2003/role/positiveLabel" xlink:type="resource" xml:lang="en-US">Number of shares of common stock sold (in shares)</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesIssued_1FF116A0E0DCC75D69D895A0E3705224_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_1FF116A0E0DCC75D69D895A0E3705224" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Shares, Issued</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_1FF116A0E0DCC75D69D895A0E3705224" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesIssued_1FF116A0E0DCC75D69D895A0E3705224" xlink:to="lab_us-gaap_CommonStockSharesIssued_1FF116A0E0DCC75D69D895A0E3705224" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_2F99F2DB3F4E7DE1022F95A0E36F8E1A_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_2F99F2DB3F4E7DE1022F95A0E36F8E1A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from issuance of common stock</link:label>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_2F99F2DB3F4E7DE1022F95A0E36F8E1A_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_2F99F2DB3F4E7DE1022F95A0E36F8E1A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Issuance of Common Stock</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_2F99F2DB3F4E7DE1022F95A0E36F8E1A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_2F99F2DB3F4E7DE1022F95A0E36F8E1A" xlink:to="lab_us-gaap_ProceedsFromIssuanceOfCommonStock_2F99F2DB3F4E7DE1022F95A0E36F8E1A" xlink:type="arc" />
    <link:label id="lab_astm_AtTheMarketSalesAgreementMaximumAggregateProceeds_E704C6DC1385DA9315B195A0E36F3940_terseLabel_en-US" xlink:label="lab_astm_AtTheMarketSalesAgreementMaximumAggregateProceeds_E704C6DC1385DA9315B195A0E36F3940" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">At-the-market sales agreement, maximum aggregate proceeds</link:label>
    <link:label id="lab_astm_AtTheMarketSalesAgreementMaximumAggregateProceeds_E704C6DC1385DA9315B195A0E36F3940_label_en-US" xlink:label="lab_astm_AtTheMarketSalesAgreementMaximumAggregateProceeds_E704C6DC1385DA9315B195A0E36F3940" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">At-The-Market Sales Agreement, Maximum Aggregate Proceeds</link:label>
    <link:label id="lab_astm_AtTheMarketSalesAgreementMaximumAggregateProceeds_E704C6DC1385DA9315B195A0E36F3940_documentation_en-US" xlink:label="lab_astm_AtTheMarketSalesAgreementMaximumAggregateProceeds_E704C6DC1385DA9315B195A0E36F3940" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">At-The-Market Sales Agreement, Maximum Aggregate Proceeds</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_AtTheMarketSalesAgreementMaximumAggregateProceeds" xlink:label="loc_astm_AtTheMarketSalesAgreementMaximumAggregateProceeds_E704C6DC1385DA9315B195A0E36F3940" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_AtTheMarketSalesAgreementMaximumAggregateProceeds_E704C6DC1385DA9315B195A0E36F3940" xlink:to="lab_astm_AtTheMarketSalesAgreementMaximumAggregateProceeds_E704C6DC1385DA9315B195A0E36F3940" xlink:type="arc" />
    <link:label id="lab_astm_PercentageOfGrossProceedsPayableAsCommission_31471F90C5997497CD8295A0E37005EF_terseLabel_en-US" xlink:label="lab_astm_PercentageOfGrossProceedsPayableAsCommission_31471F90C5997497CD8295A0E37005EF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of gross proceeds payable as commission</link:label>
    <link:label id="lab_astm_PercentageOfGrossProceedsPayableAsCommission_31471F90C5997497CD8295A0E37005EF_label_en-US" xlink:label="lab_astm_PercentageOfGrossProceedsPayableAsCommission_31471F90C5997497CD8295A0E37005EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of Gross Proceeds Payable as Commission</link:label>
    <link:label id="lab_astm_PercentageOfGrossProceedsPayableAsCommission_31471F90C5997497CD8295A0E37005EF_documentation_en-US" xlink:label="lab_astm_PercentageOfGrossProceedsPayableAsCommission_31471F90C5997497CD8295A0E37005EF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the percentage of gross proceeds payable as commission.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_PercentageOfGrossProceedsPayableAsCommission" xlink:label="loc_astm_PercentageOfGrossProceedsPayableAsCommission_31471F90C5997497CD8295A0E37005EF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_PercentageOfGrossProceedsPayableAsCommission_31471F90C5997497CD8295A0E37005EF" xlink:to="lab_astm_PercentageOfGrossProceedsPayableAsCommission_31471F90C5997497CD8295A0E37005EF" xlink:type="arc" />
    <link:label id="lab_astm_AttheMarketSalesAgreementSharesIssued_83BE54398840FD61FFEF95A0E3706A9C_terseLabel_en-US" xlink:label="lab_astm_AttheMarketSalesAgreementSharesIssued_83BE54398840FD61FFEF95A0E3706A9C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">At-the-market sales agreement, shares issued (in shares)</link:label>
    <link:label id="lab_astm_AttheMarketSalesAgreementSharesIssued_83BE54398840FD61FFEF95A0E3706A9C_label_en-US" xlink:label="lab_astm_AttheMarketSalesAgreementSharesIssued_83BE54398840FD61FFEF95A0E3706A9C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">At-the-Market Sales Agreement, Shares Issued</link:label>
    <link:label id="lab_astm_AttheMarketSalesAgreementSharesIssued_83BE54398840FD61FFEF95A0E3706A9C_documentation_en-US" xlink:label="lab_astm_AttheMarketSalesAgreementSharesIssued_83BE54398840FD61FFEF95A0E3706A9C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">At-the-Market Sales Agreement, Shares Issued</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_AttheMarketSalesAgreementSharesIssued" xlink:label="loc_astm_AttheMarketSalesAgreementSharesIssued_83BE54398840FD61FFEF95A0E3706A9C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_AttheMarketSalesAgreementSharesIssued_83BE54398840FD61FFEF95A0E3706A9C" xlink:to="lab_astm_AttheMarketSalesAgreementSharesIssued_83BE54398840FD61FFEF95A0E3706A9C" xlink:type="arc" />
    <link:label id="lab_astm_AtTheMarketSalesAgreementProceedsFromIssuanceOfCommonStock_661CCB507A6A0CF5C0DE95A0E3703EE9_terseLabel_en-US" xlink:label="lab_astm_AtTheMarketSalesAgreementProceedsFromIssuanceOfCommonStock_661CCB507A6A0CF5C0DE95A0E3703EE9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">At-the-market-sales agreement, proceeds from issuance of common stock</link:label>
    <link:label id="lab_astm_AtTheMarketSalesAgreementProceedsFromIssuanceOfCommonStock_661CCB507A6A0CF5C0DE95A0E3703EE9_label_en-US" xlink:label="lab_astm_AtTheMarketSalesAgreementProceedsFromIssuanceOfCommonStock_661CCB507A6A0CF5C0DE95A0E3703EE9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">At-The-Market-Sales Agreement, Proceeds From Issuance Of Common Stock</link:label>
    <link:label id="lab_astm_AtTheMarketSalesAgreementProceedsFromIssuanceOfCommonStock_661CCB507A6A0CF5C0DE95A0E3703EE9_documentation_en-US" xlink:label="lab_astm_AtTheMarketSalesAgreementProceedsFromIssuanceOfCommonStock_661CCB507A6A0CF5C0DE95A0E3703EE9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">At-The-Market-Sales Agreement, Proceeds From Issuance Of Common Stock</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_AtTheMarketSalesAgreementProceedsFromIssuanceOfCommonStock" xlink:label="loc_astm_AtTheMarketSalesAgreementProceedsFromIssuanceOfCommonStock_661CCB507A6A0CF5C0DE95A0E3703EE9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_AtTheMarketSalesAgreementProceedsFromIssuanceOfCommonStock_661CCB507A6A0CF5C0DE95A0E3703EE9" xlink:to="lab_astm_AtTheMarketSalesAgreementProceedsFromIssuanceOfCommonStock_661CCB507A6A0CF5C0DE95A0E3703EE9" xlink:type="arc" />
    <link:label id="lab_astm_CommonStockRemainingCapacity_66B690EF9D351C2103E295A0E370B2FF_terseLabel_en-US" xlink:label="lab_astm_CommonStockRemainingCapacity_66B690EF9D351C2103E295A0E370B2FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount of net capacity remaining on the ATM</link:label>
    <link:label id="lab_astm_CommonStockRemainingCapacity_66B690EF9D351C2103E295A0E370B2FF_label_en-US" xlink:label="lab_astm_CommonStockRemainingCapacity_66B690EF9D351C2103E295A0E370B2FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock Remaining Capacity</link:label>
    <link:label id="lab_astm_CommonStockRemainingCapacity_66B690EF9D351C2103E295A0E370B2FF_documentation_en-US" xlink:label="lab_astm_CommonStockRemainingCapacity_66B690EF9D351C2103E295A0E370B2FF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount of remaining capacity of common stock.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_CommonStockRemainingCapacity" xlink:label="loc_astm_CommonStockRemainingCapacity_66B690EF9D351C2103E295A0E370B2FF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_CommonStockRemainingCapacity_66B690EF9D351C2103E295A0E370B2FF" xlink:to="lab_astm_CommonStockRemainingCapacity_66B690EF9D351C2103E295A0E370B2FF" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues_FAE2AE020FE4869177EC95A0E36F891A_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues_FAE2AE020FE4869177EC95A0E36F891A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of common shares sold (in shares)</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues_FAE2AE020FE4869177EC95A0E36F891A_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesNewIssues_FAE2AE020FE4869177EC95A0E36F891A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Shares, New Issues</link:label>
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    <link:label id="lab_astm_UnderwritersDiscount_0E5A9FA704E697998CD395A0E370240A_label_en-US" xlink:label="lab_astm_UnderwritersDiscount_0E5A9FA704E697998CD395A0E370240A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Underwriters Discount</link:label>
    <link:label id="lab_astm_UnderwritersDiscount_0E5A9FA704E697998CD395A0E370240A_documentation_en-US" xlink:label="lab_astm_UnderwritersDiscount_0E5A9FA704E697998CD395A0E370240A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information about underwriters' discount on common stock.</link:label>
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    <link:label id="lab_us-gaap_ConversionOfStockSharesConverted1_68E795004E14058E2D9B95A0E370B150_label_en-US" xlink:label="lab_us-gaap_ConversionOfStockSharesConverted1_68E795004E14058E2D9B95A0E370B150" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Conversion of Stock, Shares Converted</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConversionOfStockSharesConverted1" xlink:label="loc_us-gaap_ConversionOfStockSharesConverted1_68E795004E14058E2D9B95A0E370B150" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConversionOfStockSharesConverted1_68E795004E14058E2D9B95A0E370B150" xlink:to="lab_us-gaap_ConversionOfStockSharesConverted1_68E795004E14058E2D9B95A0E370B150" xlink:type="arc" />
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    <link:label id="lab_us-gaap_ConversionOfStockSharesIssued1_4402681547CD9E246F8695A0E3713623_label_en-US" xlink:label="lab_us-gaap_ConversionOfStockSharesIssued1_4402681547CD9E246F8695A0E3713623" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Conversion of Stock, Shares Issued</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConversionOfStockSharesIssued1" xlink:label="loc_us-gaap_ConversionOfStockSharesIssued1_4402681547CD9E246F8695A0E3713623" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConversionOfStockSharesIssued1_4402681547CD9E246F8695A0E3713623" xlink:to="lab_us-gaap_ConversionOfStockSharesIssued1_4402681547CD9E246F8695A0E3713623" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConversionOfStockAmountConverted1_20D64DE9195E45A40B6295A0E371564B_terseLabel_en-US" xlink:label="lab_us-gaap_ConversionOfStockAmountConverted1_20D64DE9195E45A40B6295A0E371564B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Conversion of stock, amount converted</link:label>
    <link:label id="lab_us-gaap_ConversionOfStockAmountConverted1_20D64DE9195E45A40B6295A0E371564B_label_en-US" xlink:label="lab_us-gaap_ConversionOfStockAmountConverted1_20D64DE9195E45A40B6295A0E371564B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Conversion of Stock, Amount Converted</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConversionOfStockAmountConverted1" xlink:label="loc_us-gaap_ConversionOfStockAmountConverted1_20D64DE9195E45A40B6295A0E371564B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConversionOfStockAmountConverted1_20D64DE9195E45A40B6295A0E371564B" xlink:to="lab_us-gaap_ConversionOfStockAmountConverted1_20D64DE9195E45A40B6295A0E371564B" xlink:type="arc" />
    <link:label id="lab_us-gaap_PreferredStockTextBlock_65DCB05BA8786B41AE5D8C124F70FD0C_terseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockTextBlock_65DCB05BA8786B41AE5D8C124F70FD0C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Preferred Stock</link:label>
    <link:label id="lab_us-gaap_PreferredStockTextBlock_65DCB05BA8786B41AE5D8C124F70FD0C_label_en-US" xlink:label="lab_us-gaap_PreferredStockTextBlock_65DCB05BA8786B41AE5D8C124F70FD0C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PreferredStockTextBlock" xlink:label="loc_us-gaap_PreferredStockTextBlock_65DCB05BA8786B41AE5D8C124F70FD0C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PreferredStockTextBlock_65DCB05BA8786B41AE5D8C124F70FD0C" xlink:to="lab_us-gaap_PreferredStockTextBlock_65DCB05BA8786B41AE5D8C124F70FD0C" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_A7D404C88EDB389598468FED56FCD531_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_A7D404C88EDB389598468FED56FCD531" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued expenses</link:label>
    <link:label id="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_A7D404C88EDB389598468FED56FCD531_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_A7D404C88EDB389598468FED56FCD531" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued Liabilities, Current [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccruedLiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_A7D404C88EDB389598468FED56FCD531" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_A7D404C88EDB389598468FED56FCD531" xlink:to="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_A7D404C88EDB389598468FED56FCD531" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccruedBonusesCurrent_79180DB243A33B5ED5218FED56FD6879_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedBonusesCurrent_79180DB243A33B5ED5218FED56FD6879" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Bonus</link:label>
    <link:label id="lab_us-gaap_AccruedBonusesCurrent_79180DB243A33B5ED5218FED56FD6879_label_en-US" xlink:label="lab_us-gaap_AccruedBonusesCurrent_79180DB243A33B5ED5218FED56FD6879" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued Bonuses, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccruedBonusesCurrent" xlink:label="loc_us-gaap_AccruedBonusesCurrent_79180DB243A33B5ED5218FED56FD6879" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedBonusesCurrent_79180DB243A33B5ED5218FED56FD6879" xlink:to="lab_us-gaap_AccruedBonusesCurrent_79180DB243A33B5ED5218FED56FD6879" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_9302B354020FD6A6018D8FED56FD592A_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_9302B354020FD6A6018D8FED56FD592A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee related accruals</link:label>
    <link:label id="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_9302B354020FD6A6018D8FED56FD592A_label_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_9302B354020FD6A6018D8FED56FD592A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee-related Liabilities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_9302B354020FD6A6018D8FED56FD592A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_9302B354020FD6A6018D8FED56FD592A" xlink:to="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_9302B354020FD6A6018D8FED56FD592A" xlink:type="arc" />
    <link:label id="lab_astm_AccruedExpensesCurrent_C050DE09B9A1D357A91E8FED56FD512D_terseLabel_en-US" xlink:label="lab_astm_AccruedExpensesCurrent_C050DE09B9A1D357A91E8FED56FD512D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued expenses</link:label>
    <link:label id="lab_astm_AccruedExpensesCurrent_C050DE09B9A1D357A91E8FED56FD512D_label_en-US" xlink:label="lab_astm_AccruedExpensesCurrent_C050DE09B9A1D357A91E8FED56FD512D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued Expenses, Current</link:label>
    <link:label id="lab_astm_AccruedExpensesCurrent_C050DE09B9A1D357A91E8FED56FD512D_documentation_en-US" xlink:label="lab_astm_AccruedExpensesCurrent_C050DE09B9A1D357A91E8FED56FD512D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents accrued expenses, current.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_AccruedExpensesCurrent" xlink:label="loc_astm_AccruedExpensesCurrent_C050DE09B9A1D357A91E8FED56FD512D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_AccruedExpensesCurrent_C050DE09B9A1D357A91E8FED56FD512D" xlink:to="lab_astm_AccruedExpensesCurrent_C050DE09B9A1D357A91E8FED56FD512D" xlink:type="arc" />
    <link:label id="lab_astm_AccruedExpensesOtherCurrent_673D9F47719957FA20D48FED56FDF1DE_terseLabel_en-US" xlink:label="lab_astm_AccruedExpensesOtherCurrent_673D9F47719957FA20D48FED56FDF1DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_astm_AccruedExpensesOtherCurrent_673D9F47719957FA20D48FED56FDF1DE_label_en-US" xlink:label="lab_astm_AccruedExpensesOtherCurrent_673D9F47719957FA20D48FED56FDF1DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued Expenses, Other, Current</link:label>
    <link:label id="lab_astm_AccruedExpensesOtherCurrent_673D9F47719957FA20D48FED56FDF1DE_documentation_en-US" xlink:label="lab_astm_AccruedExpensesOtherCurrent_673D9F47719957FA20D48FED56FDF1DE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents other accrued expenses, current.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_AccruedExpensesOtherCurrent" xlink:label="loc_astm_AccruedExpensesOtherCurrent_673D9F47719957FA20D48FED56FDF1DE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_F5500C9BE75B850E75738FED56FDEB4D_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_F5500C9BE75B850E75738FED56FDEB4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued Liabilities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_F5500C9BE75B850E75738FED56FDEB4D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AccountingPoliciesAbstract_615ECA19AE1DD914F2738C124FCD463C_label_en-US" xlink:label="lab_us-gaap_AccountingPoliciesAbstract_615ECA19AE1DD914F2738C124FCD463C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounting Policies [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_615ECA19AE1DD914F2738C124FCD463C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_615ECA19AE1DD914F2738C124FCD463C" xlink:to="lab_us-gaap_AccountingPoliciesAbstract_615ECA19AE1DD914F2738C124FCD463C" xlink:type="arc" />
    <link:label id="lab_us-gaap_SignificantAccountingPoliciesTextBlock_0E687B6F9E0E69D179448C124FCD6276_terseLabel_en-US" xlink:label="lab_us-gaap_SignificantAccountingPoliciesTextBlock_0E687B6F9E0E69D179448C124FCD6276" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of Significant Accounting Policies</link:label>
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    <link:label id="lab_us-gaap_StraightLineRent_32D80D99DDAB9C307FA1AF73DBC9811D_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_StraightLineRent_32D80D99DDAB9C307FA1AF73DBC9811D" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Deferred rent expense</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_713F3B8706D46C8E2657AF73DBCA305C_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_713F3B8706D46C8E2657AF73DBCA305C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used for investing activities</link:label>
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    <link:label id="lab_us-gaap_TitleOfIndividualAxis_CFE3E3C6F0ED1165511BAC0477C7F092_label_en-US" xlink:label="lab_us-gaap_TitleOfIndividualAxis_CFE3E3C6F0ED1165511BAC0477C7F092" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Title of Individual [Axis]</link:label>
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    <link:label id="lab_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_7C03332B280ADBF6599DAC0477C70EA4_terseLabel_en-US" xlink:label="lab_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_7C03332B280ADBF6599DAC0477C70EA4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Relationship to Entity [Domain]</link:label>
    <link:label id="lab_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_7C03332B280ADBF6599DAC0477C70EA4_label_en-US" xlink:label="lab_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_7C03332B280ADBF6599DAC0477C70EA4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Relationship to Entity [Domain]</link:label>
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    <link:label id="lab_astm_NonEmployeeMember_FD0CF3A5C591B4B0FBA4AC0477C80A2A_terseLabel_en-US" xlink:label="lab_astm_NonEmployeeMember_FD0CF3A5C591B4B0FBA4AC0477C80A2A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-employee</link:label>
    <link:label id="lab_astm_NonEmployeeMember_FD0CF3A5C591B4B0FBA4AC0477C80A2A_label_en-US" xlink:label="lab_astm_NonEmployeeMember_FD0CF3A5C591B4B0FBA4AC0477C80A2A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non Employee [Member]</link:label>
    <link:label id="lab_astm_NonEmployeeMember_FD0CF3A5C591B4B0FBA4AC0477C80A2A_documentation_en-US" xlink:label="lab_astm_NonEmployeeMember_FD0CF3A5C591B4B0FBA4AC0477C80A2A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the non-employee director of the entity.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_NonEmployeeMember" xlink:label="loc_astm_NonEmployeeMember_FD0CF3A5C591B4B0FBA4AC0477C80A2A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9E23F844F3F3743DBFFDAC0477C84D88_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9E23F844F3F3743DBFFDAC0477C84D88" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock-Based Compensation</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9E23F844F3F3743DBFFDAC0477C84D88" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_3AD047FBE93AB55F75F7AC0477C848EA_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_3AD047FBE93AB55F75F7AC0477C848EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_3AD047FBE93AB55F75F7AC0477C848EA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_3AD047FBE93AB55F75F7AC0477C848EA" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_3AD047FBE93AB55F75F7AC0477C848EA" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_674BE955AAFAF0892E46AC0477C87FAD" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_AF427657519B1A222864AC0477C85CF7" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_961397ED81EE7A47148DAC0477C83D41" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_297CD721909FB627A2FFAC0477CAAD45_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_297CD721909FB627A2FFAC0477CAAD45" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Granted (in dollars per share)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_297CD721909FB627A2FFAC0477CAAD45" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_398820672A7284E0E476AC0477CA150C_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_398820672A7284E0E476AC0477CA150C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercised (in dollars per share)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_398820672A7284E0E476AC0477CA150C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_4CD77B0D6CD8AB944938AC0477CA1533_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_4CD77B0D6CD8AB944938AC0477CA1533" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expired (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_4CD77B0D6CD8AB944938AC0477CA1533_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_4CD77B0D6CD8AB944938AC0477CA1533" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_4CD77B0D6CD8AB944938AC0477CA1533" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_669533A6B6BA93262025AC0477CA0726_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_669533A6B6BA93262025AC0477CA0726" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forfeited or expired (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_669533A6B6BA93262025AC0477CA0726_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_669533A6B6BA93262025AC0477CA0726" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price</link:label>
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    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_761D20E24356766A4103B4CBDCA0B360_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_761D20E24356766A4103B4CBDCA0B360" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable (net of allowance for doubtful accounts of $225 and $68, respectively)</link:label>
    <link:label id="lab_us-gaap_AccountsReceivableNetCurrent_761D20E24356766A4103B4CBDCA0B360_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_761D20E24356766A4103B4CBDCA0B360" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Receivable, Net, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_761D20E24356766A4103B4CBDCA0B360" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InventoryNet_C09E7E0B5076DEF68F6DB4CBDCA1B4A0_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_C09E7E0B5076DEF68F6DB4CBDCA1B4A0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventory</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_C09E7E0B5076DEF68F6DB4CBDCA1B4A0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNet_C09E7E0B5076DEF68F6DB4CBDCA1B4A0" xlink:to="lab_us-gaap_InventoryNet_C09E7E0B5076DEF68F6DB4CBDCA1B4A0" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherAssetsCurrent_B48B75C3C06EFA015A43B4CBDCA1EA82_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_B48B75C3C06EFA015A43B4CBDCA1EA82" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current assets</link:label>
    <link:label id="lab_us-gaap_OtherAssetsCurrent_B48B75C3C06EFA015A43B4CBDCA1EA82_label_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_B48B75C3C06EFA015A43B4CBDCA1EA82" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_B48B75C3C06EFA015A43B4CBDCA1EA82" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsCurrent_BD46472F9484BBF6531AB4CBDCA13A76_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_BD46472F9484BBF6531AB4CBDCA13A76" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current assets</link:label>
    <link:label id="lab_us-gaap_AssetsCurrent_BD46472F9484BBF6531AB4CBDCA13A76_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_BD46472F9484BBF6531AB4CBDCA13A76" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_BD46472F9484BBF6531AB4CBDCA13A76" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrent_BD46472F9484BBF6531AB4CBDCA13A76" xlink:to="lab_us-gaap_AssetsCurrent_BD46472F9484BBF6531AB4CBDCA13A76" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_C414A2033C38A2767654B4CBDCA15C62_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_C414A2033C38A2767654B4CBDCA15C62" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property and equipment, net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_C414A2033C38A2767654B4CBDCA15C62" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_C414A2033C38A2767654B4CBDCA15C62" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentNet_C414A2033C38A2767654B4CBDCA15C62" xlink:type="arc" />
    <link:label id="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_66DE78800DF4CB159754B4CBDCA13BE9_terseLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_66DE78800DF4CB159754B4CBDCA13BE9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible assets</link:label>
    <link:label id="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_66DE78800DF4CB159754B4CBDCA13BE9_label_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_66DE78800DF4CB159754B4CBDCA13BE9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intangible Assets, Net (Excluding Goodwill)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_66DE78800DF4CB159754B4CBDCA13BE9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_66DE78800DF4CB159754B4CBDCA13BE9" xlink:to="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_66DE78800DF4CB159754B4CBDCA13BE9" xlink:type="arc" />
    <link:label id="lab_us-gaap_Assets_2EC888C351F15081BDD4B4CBDCA18E57_totalLabel_en-US" xlink:label="lab_us-gaap_Assets_2EC888C351F15081BDD4B4CBDCA18E57" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total assets</link:label>
    <link:label id="lab_us-gaap_Assets_2EC888C351F15081BDD4B4CBDCA18E57_label_en-US" xlink:label="lab_us-gaap_Assets_2EC888C351F15081BDD4B4CBDCA18E57" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_2EC888C351F15081BDD4B4CBDCA18E57" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Assets_2EC888C351F15081BDD4B4CBDCA18E57" xlink:to="lab_us-gaap_Assets_2EC888C351F15081BDD4B4CBDCA18E57" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_DBFEDB2244CA15EFFBFCB4CBDCA1EE80_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_DBFEDB2244CA15EFFBFCB4CBDCA1EE80" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">LIABILITIES AND SHAREHOLDERS&#8217; EQUITY</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_DBFEDB2244CA15EFFBFCB4CBDCA1EE80_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_DBFEDB2244CA15EFFBFCB4CBDCA1EE80" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities and Equity [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_DBFEDB2244CA15EFFBFCB4CBDCA1EE80" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_E9119946BEF99EBCB034B4CBDCA13AE1_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_E9119946BEF99EBCB034B4CBDCA13AE1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current liabilities:</link:label>
    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_E9119946BEF99EBCB034B4CBDCA13AE1_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_E9119946BEF99EBCB034B4CBDCA13AE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Current [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_E9119946BEF99EBCB034B4CBDCA13AE1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_E9119946BEF99EBCB034B4CBDCA13AE1" xlink:to="lab_us-gaap_LiabilitiesCurrentAbstract_E9119946BEF99EBCB034B4CBDCA13AE1" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsPayableCurrent_1773622FE1F59E16BFE2B4CBDCA166BF_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_1773622FE1F59E16BFE2B4CBDCA166BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable</link:label>
    <link:label id="lab_us-gaap_AccountsPayableCurrent_1773622FE1F59E16BFE2B4CBDCA166BF_label_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_1773622FE1F59E16BFE2B4CBDCA166BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Payable, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_1773622FE1F59E16BFE2B4CBDCA166BF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsPayableCurrent_1773622FE1F59E16BFE2B4CBDCA166BF" xlink:to="lab_us-gaap_AccountsPayableCurrent_1773622FE1F59E16BFE2B4CBDCA166BF" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_6A6544008EB8C372C8D0B4CBDCA20F3B_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_6A6544008EB8C372C8D0B4CBDCA20F3B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued expenses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_6A6544008EB8C372C8D0B4CBDCA20F3B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_6A6544008EB8C372C8D0B4CBDCA20F3B" xlink:to="lab_us-gaap_AccruedLiabilitiesCurrent_6A6544008EB8C372C8D0B4CBDCA20F3B" xlink:type="arc" />
    <link:label id="lab_us-gaap_WarrantsAndRightsOutstanding_04C80193CF7520827F03B4CBDCA231A6_terseLabel_en-US" xlink:label="lab_us-gaap_WarrantsAndRightsOutstanding_04C80193CF7520827F03B4CBDCA231A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warrant liabilities</link:label>
    <link:label id="lab_us-gaap_WarrantsAndRightsOutstanding_04C80193CF7520827F03B4CBDCA231A6_label_en-US" xlink:label="lab_us-gaap_WarrantsAndRightsOutstanding_04C80193CF7520827F03B4CBDCA231A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrants and Rights Outstanding</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_WarrantsAndRightsOutstanding" xlink:label="loc_us-gaap_WarrantsAndRightsOutstanding_04C80193CF7520827F03B4CBDCA231A6" xlink:type="locator" />
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    <link:label id="lab_astm_LineofCreditandTermLoanCreditAgreementCurrentNetofDeferredCosts_F1BD15FE1CEFE19862A0B4CBDCA2E5A9_terseLabel_en-US" xlink:label="lab_astm_LineofCreditandTermLoanCreditAgreementCurrentNetofDeferredCosts_F1BD15FE1CEFE19862A0B4CBDCA2E5A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current portion of term loan credit agreement, net of deferred costs of $110</link:label>
    <link:label id="lab_astm_LineofCreditandTermLoanCreditAgreementCurrentNetofDeferredCosts_F1BD15FE1CEFE19862A0B4CBDCA2E5A9_label_en-US" xlink:label="lab_astm_LineofCreditandTermLoanCreditAgreementCurrentNetofDeferredCosts_F1BD15FE1CEFE19862A0B4CBDCA2E5A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit and Term Loan Credit Agreement, Current, Net of Deferred Costs</link:label>
    <link:label id="lab_astm_LineofCreditandTermLoanCreditAgreementCurrentNetofDeferredCosts_F1BD15FE1CEFE19862A0B4CBDCA2E5A9_documentation_en-US" xlink:label="lab_astm_LineofCreditandTermLoanCreditAgreementCurrentNetofDeferredCosts_F1BD15FE1CEFE19862A0B4CBDCA2E5A9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line of Credit and Term Loan Credit Agreement, Current, Net of Deferred Costs</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_LineofCreditandTermLoanCreditAgreementCurrentNetofDeferredCosts" xlink:label="loc_astm_LineofCreditandTermLoanCreditAgreementCurrentNetofDeferredCosts_F1BD15FE1CEFE19862A0B4CBDCA2E5A9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherLiabilitiesCurrent_D539B6C289691826F8C7B4CBDCA2FA64_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesCurrent_D539B6C289691826F8C7B4CBDCA2FA64" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_D539B6C289691826F8C7B4CBDCA2FA64" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LiabilitiesCurrent_71D35EB884DE464F0CC5B4CBDCA2095D_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_71D35EB884DE464F0CC5B4CBDCA2095D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current liabilities</link:label>
    <link:label id="lab_us-gaap_LiabilitiesCurrent_71D35EB884DE464F0CC5B4CBDCA2095D_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_71D35EB884DE464F0CC5B4CBDCA2095D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_71D35EB884DE464F0CC5B4CBDCA2095D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesCurrent_71D35EB884DE464F0CC5B4CBDCA2095D" xlink:to="lab_us-gaap_LiabilitiesCurrent_71D35EB884DE464F0CC5B4CBDCA2095D" xlink:type="arc" />
    <link:label id="lab_astm_LineofCreditandTermLoanCreditAgreementNoncurrentNetofDeferredCosts_D411C5922D312C8D67C5B4CBDCA25CC8_terseLabel_en-US" xlink:label="lab_astm_LineofCreditandTermLoanCreditAgreementNoncurrentNetofDeferredCosts_D411C5922D312C8D67C5B4CBDCA25CC8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving and term loan credit agreement, net of deferred costs of $293</link:label>
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    <link:label id="lab_us-gaap_Liabilities_A6DC482F01DAEFFF4978B4CBDCA27E7E_label_en-US" xlink:label="lab_us-gaap_Liabilities_A6DC482F01DAEFFF4978B4CBDCA27E7E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_A6DC482F01DAEFFF4978B4CBDCA27E7E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Liabilities_A6DC482F01DAEFFF4978B4CBDCA27E7E" xlink:to="lab_us-gaap_Liabilities_A6DC482F01DAEFFF4978B4CBDCA27E7E" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_11476556E131DA0E5AC0B4CBDCA287A0" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PreferredStockValueOutstanding_5981BD3DA0717D41354AB4CBDCA25015_label_en-US" xlink:label="lab_us-gaap_PreferredStockValueOutstanding_5981BD3DA0717D41354AB4CBDCA25015" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock, Value, Outstanding</link:label>
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    <link:label id="lab_astm_BuildingImprovementsAndLeaseholdImprovementsMember_E2CD75553DF65078C2208C124FCD5BB2_documentation_en-US" xlink:label="lab_astm_BuildingImprovementsAndLeaseholdImprovementsMember_E2CD75553DF65078C2208C124FCD5BB2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to building improvements and leasehold improvements.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_BuildingImprovementsAndLeaseholdImprovementsMember" xlink:label="loc_astm_BuildingImprovementsAndLeaseholdImprovementsMember_E2CD75553DF65078C2208C124FCD5BB2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_BuildingImprovementsAndLeaseholdImprovementsMember_E2CD75553DF65078C2208C124FCD5BB2" xlink:to="lab_astm_BuildingImprovementsAndLeaseholdImprovementsMember_E2CD75553DF65078C2208C124FCD5BB2" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_E36853791B82DBFCB2278C124FCD6AC6_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_E36853791B82DBFCB2278C124FCD6AC6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_E36853791B82DBFCB2278C124FCD6AC6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_E36853791B82DBFCB2278C124FCD6AC6" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentLineItems_E36853791B82DBFCB2278C124FCD6AC6" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_E056DE8F16E9A04E13818C124FCDB840_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_E056DE8F16E9A04E13818C124FCDB840" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Useful lives</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_E056DE8F16E9A04E13818C124FCDB840_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_E056DE8F16E9A04E13818C124FCDB840" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Useful Life</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_E056DE8F16E9A04E13818C124FCDB840" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_E056DE8F16E9A04E13818C124FCDB840" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_E056DE8F16E9A04E13818C124FCDB840" xlink:type="arc" />
    <link:label id="lab_astm_ScheduleOfFutureMinimumRentalPaymentsForOperatingAndCapitalLeasesTableTextBlock_F387707EA7DF8964CC3F8C124E055569_terseLabel_en-US" xlink:label="lab_astm_ScheduleOfFutureMinimumRentalPaymentsForOperatingAndCapitalLeasesTableTextBlock_F387707EA7DF8964CC3F8C124E055569" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of future minimum payments related to leases</link:label>
    <link:label id="lab_astm_ScheduleOfFutureMinimumRentalPaymentsForOperatingAndCapitalLeasesTableTextBlock_F387707EA7DF8964CC3F8C124E055569_label_en-US" xlink:label="lab_astm_ScheduleOfFutureMinimumRentalPaymentsForOperatingAndCapitalLeasesTableTextBlock_F387707EA7DF8964CC3F8C124E055569" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Future Minimum Rental Payments For Operating And Capital Leases Table Text Block</link:label>
    <link:label id="lab_astm_ScheduleOfFutureMinimumRentalPaymentsForOperatingAndCapitalLeasesTableTextBlock_F387707EA7DF8964CC3F8C124E055569_documentation_en-US" xlink:label="lab_astm_ScheduleOfFutureMinimumRentalPaymentsForOperatingAndCapitalLeasesTableTextBlock_F387707EA7DF8964CC3F8C124E055569" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure of operating and capital leases.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_ScheduleOfFutureMinimumRentalPaymentsForOperatingAndCapitalLeasesTableTextBlock" xlink:label="loc_astm_ScheduleOfFutureMinimumRentalPaymentsForOperatingAndCapitalLeasesTableTextBlock_F387707EA7DF8964CC3F8C124E055569" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_ScheduleOfFutureMinimumRentalPaymentsForOperatingAndCapitalLeasesTableTextBlock_F387707EA7DF8964CC3F8C124E055569" xlink:to="lab_astm_ScheduleOfFutureMinimumRentalPaymentsForOperatingAndCapitalLeasesTableTextBlock_F387707EA7DF8964CC3F8C124E055569" xlink:type="arc" />
    <link:label id="lab_astm_SeriesB1PreferredStockMember_6B559E8957D00FD60384A4AD2310BD62_terseLabel_en-US" xlink:label="lab_astm_SeriesB1PreferredStockMember_6B559E8957D00FD60384A4AD2310BD62" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Series B-1 non-voting convertible preferred stock</link:label>
    <link:label id="lab_astm_SeriesB1PreferredStockMember_6B559E8957D00FD60384A4AD2310BD62_label_en-US" xlink:label="lab_astm_SeriesB1PreferredStockMember_6B559E8957D00FD60384A4AD2310BD62" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Series B1 Preferred Stock [Member]</link:label>
    <link:label id="lab_astm_SeriesB1PreferredStockMember_6B559E8957D00FD60384A4AD2310BD62_documentation_en-US" xlink:label="lab_astm_SeriesB1PreferredStockMember_6B559E8957D00FD60384A4AD2310BD62" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Convertible preferred shares with no voting rights, reported as temporary equity not forming the part of equity.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_SeriesB1PreferredStockMember" xlink:label="loc_astm_SeriesB1PreferredStockMember_6B559E8957D00FD60384A4AD2310BD62" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_SeriesB1PreferredStockMember_6B559E8957D00FD60384A4AD2310BD62" xlink:to="lab_astm_SeriesB1PreferredStockMember_6B559E8957D00FD60384A4AD2310BD62" xlink:type="arc" />
    <link:label id="lab_us-gaap_ClassOfStockLineItems_79217D03034FC1082B7DA4AD2310D35D_verboseLabel_en-US" xlink:label="lab_us-gaap_ClassOfStockLineItems_79217D03034FC1082B7DA4AD2310D35D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Series B Convertible Preferred Stock</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ClassOfStockLineItems" xlink:label="loc_us-gaap_ClassOfStockLineItems_79217D03034FC1082B7DA4AD2310D35D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfStockLineItems_79217D03034FC1082B7DA4AD2310D35D" xlink:to="lab_us-gaap_ClassOfStockLineItems_79217D03034FC1082B7DA4AD2310D35D" xlink:type="arc" />
    <link:label id="lab_astm_StockIssuedDuringPeriodOfferingPricePerShare_1F65534B8649525307CAA4AD2310E329_terseLabel_en-US" xlink:label="lab_astm_StockIssuedDuringPeriodOfferingPricePerShare_1F65534B8649525307CAA4AD2310E329" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Offering price per share (in dollars per share)</link:label>
    <link:label id="lab_astm_StockIssuedDuringPeriodOfferingPricePerShare_1F65534B8649525307CAA4AD2310E329_label_en-US" xlink:label="lab_astm_StockIssuedDuringPeriodOfferingPricePerShare_1F65534B8649525307CAA4AD2310E329" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period Offering Price Per Share</link:label>
    <link:label id="lab_astm_StockIssuedDuringPeriodOfferingPricePerShare_1F65534B8649525307CAA4AD2310E329_documentation_en-US" xlink:label="lab_astm_StockIssuedDuringPeriodOfferingPricePerShare_1F65534B8649525307CAA4AD2310E329" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the offering price per share of preferred stock issued during the period.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_StockIssuedDuringPeriodOfferingPricePerShare" xlink:label="loc_astm_StockIssuedDuringPeriodOfferingPricePerShare_1F65534B8649525307CAA4AD2310E329" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_StockIssuedDuringPeriodOfferingPricePerShare_1F65534B8649525307CAA4AD2310E329" xlink:to="lab_astm_StockIssuedDuringPeriodOfferingPricePerShare_1F65534B8649525307CAA4AD2310E329" xlink:type="arc" />
    <link:label id="lab_astm_PreferredStockPeriodOfClosingOfOfferingAfterWhichSharesAreConvertible_AB8603C06844A915CBFDA4AD23106833_terseLabel_en-US" xlink:label="lab_astm_PreferredStockPeriodOfClosingOfOfferingAfterWhichSharesAreConvertible_AB8603C06844A915CBFDA4AD23106833" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Period of closing of offering after which shares are convertible</link:label>
    <link:label id="lab_astm_PreferredStockPeriodOfClosingOfOfferingAfterWhichSharesAreConvertible_AB8603C06844A915CBFDA4AD23106833_label_en-US" xlink:label="lab_astm_PreferredStockPeriodOfClosingOfOfferingAfterWhichSharesAreConvertible_AB8603C06844A915CBFDA4AD23106833" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock, Period of Closing of Offering after which Shares are Convertible</link:label>
    <link:label id="lab_astm_PreferredStockPeriodOfClosingOfOfferingAfterWhichSharesAreConvertible_AB8603C06844A915CBFDA4AD23106833_documentation_en-US" xlink:label="lab_astm_PreferredStockPeriodOfClosingOfOfferingAfterWhichSharesAreConvertible_AB8603C06844A915CBFDA4AD23106833" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the period of closing of offering after which shares are convertible.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_PreferredStockPeriodOfClosingOfOfferingAfterWhichSharesAreConvertible" xlink:label="loc_astm_PreferredStockPeriodOfClosingOfOfferingAfterWhichSharesAreConvertible_AB8603C06844A915CBFDA4AD23106833" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_PreferredStockPeriodOfClosingOfOfferingAfterWhichSharesAreConvertible_AB8603C06844A915CBFDA4AD23106833" xlink:to="lab_astm_PreferredStockPeriodOfClosingOfOfferingAfterWhichSharesAreConvertible_AB8603C06844A915CBFDA4AD23106833" xlink:type="arc" />
    <link:label id="lab_astm_PreferredStockConversionPricePerShare_3C9162E4537C4A1A8928A4AD23108C03_terseLabel_en-US" xlink:label="lab_astm_PreferredStockConversionPricePerShare_3C9162E4537C4A1A8928A4AD23108C03" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Conversion price per share (in dollars per share)</link:label>
    <link:label id="lab_astm_PreferredStockConversionPricePerShare_3C9162E4537C4A1A8928A4AD23108C03_label_en-US" xlink:label="lab_astm_PreferredStockConversionPricePerShare_3C9162E4537C4A1A8928A4AD23108C03" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock Conversion Price Per Share</link:label>
    <link:label id="lab_astm_PreferredStockConversionPricePerShare_3C9162E4537C4A1A8928A4AD23108C03_documentation_en-US" xlink:label="lab_astm_PreferredStockConversionPricePerShare_3C9162E4537C4A1A8928A4AD23108C03" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the conversion price per share of convertible preferred stock.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_PreferredStockConversionPricePerShare" xlink:label="loc_astm_PreferredStockConversionPricePerShare_3C9162E4537C4A1A8928A4AD23108C03" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_PreferredStockConversionPricePerShare_3C9162E4537C4A1A8928A4AD23108C03" xlink:to="lab_astm_PreferredStockConversionPricePerShare_3C9162E4537C4A1A8928A4AD23108C03" xlink:type="arc" />
    <link:label id="lab_astm_ConvertiblePreferredStockConversionRatioShares_03B5AF085EA78462B4C2A4AD23101A13_terseLabel_en-US" xlink:label="lab_astm_ConvertiblePreferredStockConversionRatioShares_03B5AF085EA78462B4C2A4AD23101A13" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Conversion ratio, the number of shares of common stock received per share of convertible preferred stock</link:label>
    <link:label id="lab_astm_ConvertiblePreferredStockConversionRatioShares_03B5AF085EA78462B4C2A4AD23101A13_label_en-US" xlink:label="lab_astm_ConvertiblePreferredStockConversionRatioShares_03B5AF085EA78462B4C2A4AD23101A13" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Convertible Preferred Stock Conversion Ratio, Shares</link:label>
    <link:label id="lab_astm_ConvertiblePreferredStockConversionRatioShares_03B5AF085EA78462B4C2A4AD23101A13_documentation_en-US" xlink:label="lab_astm_ConvertiblePreferredStockConversionRatioShares_03B5AF085EA78462B4C2A4AD23101A13" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents, in the form of a ratio, the number of shares of common stock received in conversion per share of convertible preferred stock.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_ConvertiblePreferredStockConversionRatioShares" xlink:label="loc_astm_ConvertiblePreferredStockConversionRatioShares_03B5AF085EA78462B4C2A4AD23101A13" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_ConvertiblePreferredStockConversionRatioShares_03B5AF085EA78462B4C2A4AD23101A13" xlink:to="lab_astm_ConvertiblePreferredStockConversionRatioShares_03B5AF085EA78462B4C2A4AD23101A13" xlink:type="arc" />
    <link:label id="lab_astm_PreferredStockCumulativeDividendRatePercentage_E3F13A5299DF29A42EBEA4AD231002CB_terseLabel_en-US" xlink:label="lab_astm_PreferredStockCumulativeDividendRatePercentage_E3F13A5299DF29A42EBEA4AD231002CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of cumulative dividend rate</link:label>
    <link:label id="lab_astm_PreferredStockCumulativeDividendRatePercentage_E3F13A5299DF29A42EBEA4AD231002CB_label_en-US" xlink:label="lab_astm_PreferredStockCumulativeDividendRatePercentage_E3F13A5299DF29A42EBEA4AD231002CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock, Cumulative Dividend Rate, Percentage</link:label>
    <link:label id="lab_astm_PreferredStockCumulativeDividendRatePercentage_E3F13A5299DF29A42EBEA4AD231002CB_documentation_en-US" xlink:label="lab_astm_PreferredStockCumulativeDividendRatePercentage_E3F13A5299DF29A42EBEA4AD231002CB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the cumulative percentage rate used to calculate dividend payments on preferred stock.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_PreferredStockCumulativeDividendRatePercentage" xlink:label="loc_astm_PreferredStockCumulativeDividendRatePercentage_E3F13A5299DF29A42EBEA4AD231002CB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_PreferredStockCumulativeDividendRatePercentage_E3F13A5299DF29A42EBEA4AD231002CB" xlink:to="lab_astm_PreferredStockCumulativeDividendRatePercentage_E3F13A5299DF29A42EBEA4AD231002CB" xlink:type="arc" />
    <link:label id="lab_astm_AccumulatedUndeclaredDividendsShares_2222B8C1829014F855B0A4AD23105542_terseLabel_en-US" xlink:label="lab_astm_AccumulatedUndeclaredDividendsShares_2222B8C1829014F855B0A4AD23105542" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated shares but undeclared dividends (in shares)</link:label>
    <link:label id="lab_astm_AccumulatedUndeclaredDividendsShares_2222B8C1829014F855B0A4AD23105542_label_en-US" xlink:label="lab_astm_AccumulatedUndeclaredDividendsShares_2222B8C1829014F855B0A4AD23105542" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Undeclared Dividends Shares</link:label>
    <link:label id="lab_astm_AccumulatedUndeclaredDividendsShares_2222B8C1829014F855B0A4AD23105542_documentation_en-US" xlink:label="lab_astm_AccumulatedUndeclaredDividendsShares_2222B8C1829014F855B0A4AD23105542" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the accumulated shares but undeclared dividends related to convertible preferred stock.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_AccumulatedUndeclaredDividendsShares" xlink:label="loc_astm_AccumulatedUndeclaredDividendsShares_2222B8C1829014F855B0A4AD23105542" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_AccumulatedUndeclaredDividendsShares_2222B8C1829014F855B0A4AD23105542" xlink:to="lab_astm_AccumulatedUndeclaredDividendsShares_2222B8C1829014F855B0A4AD23105542" xlink:type="arc" />
    <link:label id="lab_us-gaap_PreferredStockRedemptionPricePerShare_6F4A9BE460671C9B7C05A4AD2310EA38_terseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockRedemptionPricePerShare_6F4A9BE460671C9B7C05A4AD2310EA38" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Redemption price (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_PreferredStockRedemptionPricePerShare_6F4A9BE460671C9B7C05A4AD2310EA38_label_en-US" xlink:label="lab_us-gaap_PreferredStockRedemptionPricePerShare_6F4A9BE460671C9B7C05A4AD2310EA38" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Preferred Stock, Redemption Price Per Share</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PreferredStockRedemptionPricePerShare" xlink:label="loc_us-gaap_PreferredStockRedemptionPricePerShare_6F4A9BE460671C9B7C05A4AD2310EA38" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PreferredStockRedemptionPricePerShare_6F4A9BE460671C9B7C05A4AD2310EA38" xlink:to="lab_us-gaap_PreferredStockRedemptionPricePerShare_6F4A9BE460671C9B7C05A4AD2310EA38" xlink:type="arc" />
    <link:label id="lab_us-gaap_TemporaryEquityIssuePeriodIncreaseOrDecrease_7D5899FDA78F041EE020A4AD2310E63C_negatedLabel_en-US" xlink:label="lab_us-gaap_TemporaryEquityIssuePeriodIncreaseOrDecrease_7D5899FDA78F041EE020A4AD2310E63C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Reclassification of Series B preferred stock into shareholders' equity</link:label>
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    <link:label id="lab_us-gaap_EarningsPerSharePolicyTextBlock_59260CE1515A17BAE078A4AD24AAADA7_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerSharePolicyTextBlock_59260CE1515A17BAE078A4AD24AAADA7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Loss Per Share Attributable to Common Shareholders</link:label>
    <link:label id="lab_us-gaap_EarningsPerSharePolicyTextBlock_59260CE1515A17BAE078A4AD24AAADA7_label_en-US" xlink:label="lab_us-gaap_EarningsPerSharePolicyTextBlock_59260CE1515A17BAE078A4AD24AAADA7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EarningsPerSharePolicyTextBlock" xlink:label="loc_us-gaap_EarningsPerSharePolicyTextBlock_59260CE1515A17BAE078A4AD24AAADA7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_FD347C1E4063E27B3EBCA4AD24AB6022_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_FD347C1E4063E27B3EBCA4AD24AB6022" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial Instruments</link:label>
    <link:label id="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_FD347C1E4063E27B3EBCA4AD24AB6022_label_en-US" xlink:label="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_FD347C1E4063E27B3EBCA4AD24AB6022" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value of Financial Instruments, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:label="loc_us-gaap_FairValueOfFinancialInstrumentsPolicy_FD347C1E4063E27B3EBCA4AD24AB6022" xlink:type="locator" />
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    <link:label id="lab_astm_WarrantsPolicyTextBlock_C91EFC9632B0BB17DC28A4AD24AB162B_terseLabel_en-US" xlink:label="lab_astm_WarrantsPolicyTextBlock_C91EFC9632B0BB17DC28A4AD24AB162B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warrants</link:label>
    <link:label id="lab_astm_WarrantsPolicyTextBlock_C91EFC9632B0BB17DC28A4AD24AB162B_label_en-US" xlink:label="lab_astm_WarrantsPolicyTextBlock_C91EFC9632B0BB17DC28A4AD24AB162B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrants [Policy Text Block]</link:label>
    <link:label id="lab_astm_WarrantsPolicyTextBlock_C91EFC9632B0BB17DC28A4AD24AB162B_documentation_en-US" xlink:label="lab_astm_WarrantsPolicyTextBlock_C91EFC9632B0BB17DC28A4AD24AB162B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure of accounting policy for warrants.</link:label>
    <link:loc xlink:href="astm-20161231.xsd#astm_WarrantsPolicyTextBlock" xlink:label="loc_astm_WarrantsPolicyTextBlock_C91EFC9632B0BB17DC28A4AD24AB162B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_astm_WarrantsPolicyTextBlock_C91EFC9632B0BB17DC28A4AD24AB162B" xlink:to="lab_astm_WarrantsPolicyTextBlock_C91EFC9632B0BB17DC28A4AD24AB162B" xlink:type="arc" />
    <link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_207C124D9AEBCD362535A4AD24AB87F1_terseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_207C124D9AEBCD362535A4AD24AB87F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Recent Accounting Pronouncements</link:label>
    <link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_207C124D9AEBCD362535A4AD24AB87F1_label_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_207C124D9AEBCD362535A4AD24AB87F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">New Accounting Pronouncements, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:label="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_207C124D9AEBCD362535A4AD24AB87F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_207C124D9AEBCD362535A4AD24AB87F1" xlink:to="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_207C124D9AEBCD362535A4AD24AB87F1" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_AFEBC7AA7F0B3470D77E900C9AA3892D_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_AFEBC7AA7F0B3470D77E900C9AA3892D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating leases</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_AFEBC7AA7F0B3470D77E900C9AA3892D_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_AFEBC7AA7F0B3470D77E900C9AA3892D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_AFEBC7AA7F0B3470D77E900C9AA3892D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_AFEBC7AA7F0B3470D77E900C9AA3892D" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_AFEBC7AA7F0B3470D77E900C9AA3892D" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2476EBFA7BF54706D1BF900C9AA3CEFF_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2476EBFA7BF54706D1BF900C9AA3CEFF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2476EBFA7BF54706D1BF900C9AA3CEFF_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2476EBFA7BF54706D1BF900C9AA3CEFF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Due</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2476EBFA7BF54706D1BF900C9AA3CEFF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2476EBFA7BF54706D1BF900C9AA3CEFF" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_2476EBFA7BF54706D1BF900C9AA3CEFF" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_63CD7C9ACF8870F07627900C9AA3F2F8_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_63CD7C9ACF8870F07627900C9AA3F2F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2017</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_63CD7C9ACF8870F07627900C9AA3F2F8_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_63CD7C9ACF8870F07627900C9AA3F2F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments Due, Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_63CD7C9ACF8870F07627900C9AA3F2F8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_63CD7C9ACF8870F07627900C9AA3F2F8" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_63CD7C9ACF8870F07627900C9AA3F2F8" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_F07A8D30C34D605A8EBC900C9AA45E44_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_F07A8D30C34D605A8EBC900C9AA45E44" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2018</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_F07A8D30C34D605A8EBC900C9AA45E44_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_F07A8D30C34D605A8EBC900C9AA45E44" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Two Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_F07A8D30C34D605A8EBC900C9AA45E44" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_F07A8D30C34D605A8EBC900C9AA45E44" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_F07A8D30C34D605A8EBC900C9AA45E44" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_119B9009DC800FFCA18E900C9AA44BC5_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_119B9009DC800FFCA18E900C9AA44BC5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_119B9009DC800FFCA18E900C9AA44BC5_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_119B9009DC800FFCA18E900C9AA44BC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Three Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_119B9009DC800FFCA18E900C9AA44BC5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_119B9009DC800FFCA18E900C9AA44BC5" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_119B9009DC800FFCA18E900C9AA44BC5" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_4A946EBE439F427957DE900C9AA4E42A_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_4A946EBE439F427957DE900C9AA4E42A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_4A946EBE439F427957DE900C9AA4E42A_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_4A946EBE439F427957DE900C9AA4E42A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Four Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_4A946EBE439F427957DE900C9AA4E42A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_4A946EBE439F427957DE900C9AA4E42A" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_4A946EBE439F427957DE900C9AA4E42A" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_AEA3D2267F94C30088E7900C9AA4D6F0_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_AEA3D2267F94C30088E7900C9AA4D6F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_AEA3D2267F94C30088E7900C9AA4D6F0_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_AEA3D2267F94C30088E7900C9AA4D6F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due in Five Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_AEA3D2267F94C30088E7900C9AA4D6F0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_AEA3D2267F94C30088E7900C9AA4D6F0" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_AEA3D2267F94C30088E7900C9AA4D6F0" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_3845424B81696C23D28C900C9AA42DF4_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_3845424B81696C23D28C900C9AA42DF4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">More than 5 Years</link:label>
    <link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_3845424B81696C23D28C900C9AA42DF4_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_3845424B81696C23D28C900C9AA42DF4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Future Minimum Payments, Due Thereafter</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_3845424B81696C23D28C900C9AA42DF4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_3845424B81696C23D28C900C9AA42DF4" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_3845424B81696C23D28C900C9AA42DF4" xlink:type="arc" />
    <link:label id="lab_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_52FAA68B5F6AC5702629900C9AA47816_terseLabel_en-US" xlink:label="lab_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_52FAA68B5F6AC5702629900C9AA47816" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase commitments</link:label>
    <link:label id="lab_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_52FAA68B5F6AC5702629900C9AA47816_label_en-US" xlink:label="lab_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_52FAA68B5F6AC5702629900C9AA47816" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Obligation, Fiscal Year Maturity [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PurchaseObligationFiscalYearMaturityAbstract" xlink:label="loc_us-gaap_PurchaseObligationFiscalYearMaturityAbstract_52FAA68B5F6AC5702629900C9AA47816" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PurchaseObligation_3C385C51C2768739456D900C9AA49A5F_totalLabel_en-US" xlink:label="lab_us-gaap_PurchaseObligation_3C385C51C2768739456D900C9AA49A5F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_PurchaseObligation_3C385C51C2768739456D900C9AA49A5F_label_en-US" xlink:label="lab_us-gaap_PurchaseObligation_3C385C51C2768739456D900C9AA49A5F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Obligation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PurchaseObligation" xlink:label="loc_us-gaap_PurchaseObligation_3C385C51C2768739456D900C9AA49A5F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PurchaseObligationDueInNextTwelveMonths_A1491534EA0577EDCE26900C9AA4FDD9_verboseLabel_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInNextTwelveMonths_A1491534EA0577EDCE26900C9AA4FDD9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">2017</link:label>
    <link:label id="lab_us-gaap_PurchaseObligationDueInNextTwelveMonths_A1491534EA0577EDCE26900C9AA4FDD9_label_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInNextTwelveMonths_A1491534EA0577EDCE26900C9AA4FDD9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Obligation, Due in Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PurchaseObligationDueInNextTwelveMonths" xlink:label="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_A1491534EA0577EDCE26900C9AA4FDD9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_A1491534EA0577EDCE26900C9AA4FDD9" xlink:to="lab_us-gaap_PurchaseObligationDueInNextTwelveMonths_A1491534EA0577EDCE26900C9AA4FDD9" xlink:type="arc" />
    <link:label id="lab_us-gaap_PurchaseObligationDueInSecondYear_7319CA70F1DE1DBB0D80900C9AA4D378_verboseLabel_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInSecondYear_7319CA70F1DE1DBB0D80900C9AA4D378" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">2018</link:label>
    <link:label id="lab_us-gaap_PurchaseObligationDueInSecondYear_7319CA70F1DE1DBB0D80900C9AA4D378_label_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInSecondYear_7319CA70F1DE1DBB0D80900C9AA4D378" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Obligation, Due in Second Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PurchaseObligationDueInSecondYear" xlink:label="loc_us-gaap_PurchaseObligationDueInSecondYear_7319CA70F1DE1DBB0D80900C9AA4D378" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PurchaseObligationDueInSecondYear_7319CA70F1DE1DBB0D80900C9AA4D378" xlink:to="lab_us-gaap_PurchaseObligationDueInSecondYear_7319CA70F1DE1DBB0D80900C9AA4D378" xlink:type="arc" />
    <link:label id="lab_us-gaap_PurchaseObligationDueInThirdYear_386459ECF2440240DEB5900C9AA42018_terseLabel_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInThirdYear_386459ECF2440240DEB5900C9AA42018" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
    <link:label id="lab_us-gaap_PurchaseObligationDueInThirdYear_386459ECF2440240DEB5900C9AA42018_label_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInThirdYear_386459ECF2440240DEB5900C9AA42018" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Obligation, Due in Third Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PurchaseObligationDueInThirdYear" xlink:label="loc_us-gaap_PurchaseObligationDueInThirdYear_386459ECF2440240DEB5900C9AA42018" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PurchaseObligationDueInThirdYear_386459ECF2440240DEB5900C9AA42018" xlink:to="lab_us-gaap_PurchaseObligationDueInThirdYear_386459ECF2440240DEB5900C9AA42018" xlink:type="arc" />
    <link:label id="lab_us-gaap_PurchaseObligationDueInFourthYear_AB36C3186805F5347BF2900C9AA48156_terseLabel_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInFourthYear_AB36C3186805F5347BF2900C9AA48156" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_us-gaap_PurchaseObligationDueInFourthYear_AB36C3186805F5347BF2900C9AA48156_label_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInFourthYear_AB36C3186805F5347BF2900C9AA48156" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Obligation, Due in Fourth Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PurchaseObligationDueInFourthYear" xlink:label="loc_us-gaap_PurchaseObligationDueInFourthYear_AB36C3186805F5347BF2900C9AA48156" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PurchaseObligationDueInFifthYear_E5D7131607EB5397398C900C9AA5C40A_terseLabel_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInFifthYear_E5D7131607EB5397398C900C9AA5C40A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_us-gaap_PurchaseObligationDueInFifthYear_E5D7131607EB5397398C900C9AA5C40A_label_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueInFifthYear_E5D7131607EB5397398C900C9AA5C40A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Obligation, Due in Fifth Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PurchaseObligationDueInFifthYear" xlink:label="loc_us-gaap_PurchaseObligationDueInFifthYear_E5D7131607EB5397398C900C9AA5C40A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PurchaseObligationDueInFifthYear_E5D7131607EB5397398C900C9AA5C40A" xlink:to="lab_us-gaap_PurchaseObligationDueInFifthYear_E5D7131607EB5397398C900C9AA5C40A" xlink:type="arc" />
    <link:label id="lab_us-gaap_PurchaseObligationDueAfterFifthYear_488036E9B5AD46F21639900C9AA5962C_terseLabel_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueAfterFifthYear_488036E9B5AD46F21639900C9AA5962C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">More than 5 Years</link:label>
    <link:label id="lab_us-gaap_PurchaseObligationDueAfterFifthYear_488036E9B5AD46F21639900C9AA5962C_label_en-US" xlink:label="lab_us-gaap_PurchaseObligationDueAfterFifthYear_488036E9B5AD46F21639900C9AA5962C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Obligation, Due after Fifth Year</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PurchaseObligationDueAfterFifthYear" xlink:label="loc_us-gaap_PurchaseObligationDueAfterFifthYear_488036E9B5AD46F21639900C9AA5962C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PurchaseObligationDueAfterFifthYear_488036E9B5AD46F21639900C9AA5962C" xlink:to="lab_us-gaap_PurchaseObligationDueAfterFifthYear_488036E9B5AD46F21639900C9AA5962C" xlink:type="arc" />
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_3BAC1EAC724B0AC1FCC7900C9AA55052_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_3BAC1EAC724B0AC1FCC7900C9AA55052" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital leases</link:label>
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_3BAC1EAC724B0AC1FCC7900C9AA55052_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_3BAC1EAC724B0AC1FCC7900C9AA55052" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_3BAC1EAC724B0AC1FCC7900C9AA55052" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_3BAC1EAC724B0AC1FCC7900C9AA55052" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_3BAC1EAC724B0AC1FCC7900C9AA55052" xlink:type="arc" />
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_E44C0963154B4670206C900C9AA5748A_totalLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_E44C0963154B4670206C900C9AA5748A" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_E44C0963154B4670206C900C9AA5748A_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_E44C0963154B4670206C900C9AA5748A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases, Future Minimum Payments Due</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_E44C0963154B4670206C900C9AA5748A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_E44C0963154B4670206C900C9AA5748A" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_E44C0963154B4670206C900C9AA5748A" xlink:type="arc" />
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_2D5CE3FA43891921A2A0900C9AA51A7D_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_2D5CE3FA43891921A2A0900C9AA51A7D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2017</link:label>
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_2D5CE3FA43891921A2A0900C9AA51A7D_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_2D5CE3FA43891921A2A0900C9AA51A7D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases, Future Minimum Payments Due, Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_2D5CE3FA43891921A2A0900C9AA51A7D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_2D5CE3FA43891921A2A0900C9AA51A7D" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_2D5CE3FA43891921A2A0900C9AA51A7D" xlink:type="arc" />
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_A97DB3CBADC23D2E7039900C9AA53273_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_A97DB3CBADC23D2E7039900C9AA53273" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2018</link:label>
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_A97DB3CBADC23D2E7039900C9AA53273_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_A97DB3CBADC23D2E7039900C9AA53273" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases, Future Minimum Payments Due in Two Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_A97DB3CBADC23D2E7039900C9AA53273" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_A97DB3CBADC23D2E7039900C9AA53273" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_A97DB3CBADC23D2E7039900C9AA53273" xlink:type="arc" />
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_763C01F39F887C8194BA900C9AA52B4D_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_763C01F39F887C8194BA900C9AA52B4D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_763C01F39F887C8194BA900C9AA52B4D_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_763C01F39F887C8194BA900C9AA52B4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases, Future Minimum Payments Due in Three Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_763C01F39F887C8194BA900C9AA52B4D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_763C01F39F887C8194BA900C9AA52B4D" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_763C01F39F887C8194BA900C9AA52B4D" xlink:type="arc" />
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_0E377C22A9294B855C34900C9AA563D8_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_0E377C22A9294B855C34900C9AA563D8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_0E377C22A9294B855C34900C9AA563D8_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_0E377C22A9294B855C34900C9AA563D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases, Future Minimum Payments Due in Four Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_0E377C22A9294B855C34900C9AA563D8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_0E377C22A9294B855C34900C9AA563D8" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_0E377C22A9294B855C34900C9AA563D8" xlink:type="arc" />
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6F7F90394C9A5ACEAC6B900C9AA5C54F_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6F7F90394C9A5ACEAC6B900C9AA5C54F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6F7F90394C9A5ACEAC6B900C9AA5C54F_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6F7F90394C9A5ACEAC6B900C9AA5C54F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Leases, Future Minimum Payments Due in Five Years</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6F7F90394C9A5ACEAC6B900C9AA5C54F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6F7F90394C9A5ACEAC6B900C9AA5C54F" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6F7F90394C9A5ACEAC6B900C9AA5C54F" xlink:type="arc" />
    <link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_2A96DAA95162B8153959900C9AA53907_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_2A96DAA95162B8153959900C9AA53907" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">More than 5 years</link:label>
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    <link:label id="lab_astm_OneOtherThirdPartyCustomerInUsMember_FDD5691002CE54A33AA3902D2C128BF0_documentation_en-US" xlink:label="lab_astm_OneOtherThirdPartyCustomerInUsMember_FDD5691002CE54A33AA3902D2C128BF0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to one other third party customer in the U.S.</link:label>
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    <link:label id="lab_us-gaap_ConcentrationRiskLineItems_86B0EFDC347FF617947B902D2C126121_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskLineItems_86B0EFDC347FF617947B902D2C126121" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Concentration Risk [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConcentrationRiskLineItems" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_86B0EFDC347FF617947B902D2C126121" xlink:type="locator" />
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    <link:label id="lab_astm_NumberOfCustomers_07F30D861A8524746DA8902D2C13A55C_label_en-US" xlink:label="lab_astm_NumberOfCustomers_07F30D861A8524746DA8902D2C13A55C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Customers</link:label>
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    <link:label id="lab_us-gaap_ConcentrationRiskPercentage1_86F361E9476803617DDE902D2C13A5A2_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskPercentage1_86F361E9476803617DDE902D2C13A5A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Concentration Risk, Percentage</link:label>
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    <link:label id="lab_us-gaap_SalesRevenueNet_C5A64FEF3AB2C37D799A901C80C18F29_terseLabel_en-US" xlink:label="lab_us-gaap_SalesRevenueNet_C5A64FEF3AB2C37D799A901C80C18F29" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenues</link:label>
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