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Anti-dilutive shares excluded from diluted net income (loss) per common share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Employee stock purchase plan and service-based stock options Employee Stock And Employee Stock Option [Member] Employee Stock And Employee Stock Option [Member] Leases Lessee, Operating Leases [Text Block] Termination Date Trading Arrangement Termination Date Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Long-term investments Long-term Investments [Member] Long-term Investments [Member] Long-term investments Debt Securities, Available-for-Sale, Noncurrent Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Basic (in 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[Member] MACI Implants And Kits Amortization of debt issuance costs Amortization of Debt Issuance Costs Entity Tax Identification Number Entity Tax Identification Number Contingent consideration License Agreement, Contingent Consideration License Agreement, Contingent Consideration Inventory: Inventory, Net [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Stock-Based Compensation Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Stock options granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Consideration payment for license License Agreement, Consideration License Agreement, Consideration Provider or Facility Provider or Facility [Member] Provider or Facility [Member] Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Raw materials Inventory, Raw Materials, Gross Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Line of credit facility, commitment fee (in percent) Line of Credit Facility, Commitment Fee Percentage Additions to property and equipment included in accounts payable Capital Expenditures Incurred but Not yet Paid Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity NexoBrid License and Supply Agreements License Agreement [Text Block] License Agreement [Text Block] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other current liabilities Other Liabilities, Current Time-and-materials contract Time-and-Materials Contract [Member] Stock-based compensation expense Shares Granted, Value, Share-Based Payment Arrangement, after Forfeiture Statement Statement [Line Items] Variable Rate [Axis] Variable Rate [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Counterparty Name [Axis] Counterparty Name [Axis] Common Stock Common Stock [Member] Estimated Fair Value Debt securities, fair value Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate notes Corporate Debt Securities [Member] Net decrease in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Product [Member]