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[Member] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Assets, fair value Assets, Fair Value Disclosure Name Measure Name Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Other current assets Increase (Decrease) in Other Current Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Entity Filer Category Entity Filer Category Short-term investments Short-Term Investments Single Reportable Segment Single Reportable Segment [Member] Single Reportable Segment M A C I Implants and kits MACI Implants And Kits [Member] MACI Implants And Kits Through Intermediary Sales Channel, Through Intermediary [Member] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Contingent consideration License Agreement, Contingent Consideration License Agreement, Contingent Consideration Basis of Presentation Basis of Accounting [Text Block] Operating lease expense Operating Lease, Expense Company Selected Measure Amount Company Selected Measure Amount Investments, Debt and Equity Securities [Abstract] Depreciation and amortization expense Depreciation, Depletion and Amortization SOFR Secured Overnight Financing Rate (SOFR) [Member] Consideration payment for license License Agreement, Consideration License Agreement, Consideration Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Current assets: Assets, Current [Abstract] Provider or Facility Provider or Facility [Member] Provider or Facility [Member] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Cost of product sales Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] 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