Revenue - Schedule of disaggregation of revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Product sales, net	$ 276,259	$ 237,224	$ 197,516
NexoBrid	0	0	0
Total revenue	276,259	237,224	197,516
Change in estimates related to prior periods
Disaggregation of Revenue [Line Items]
Product sales, net	1,059	2,529	2,157
Total MACI implants, kits, and instruments
Disaggregation of Revenue [Line Items]
Product sales, net	239,506	197,309	164,800
Through Intermediary | MACI implants, kits, and instruments | Contract rate
Disaggregation of Revenue [Line Items]
Product sales, net	180,234	141,806	105,948
Through Intermediary | MACI implants, kits, and instruments | Time-and-materials contract
Disaggregation of Revenue [Line Items]
Product sales, net	14,444	15,058	22,203
Time-and-materials contract | MACI implants, kits, and instruments | Time-and-materials contract
Disaggregation of Revenue [Line Items]
Product sales, net	5,791	4,603	4,921
Provider or Facility | MACI implants, kits, and instruments | Contract rate
Disaggregation of Revenue [Line Items]
Product sales, net	35,371	31,217	27,484
Provider or Facility | NexoBrid
Disaggregation of Revenue [Line Items]
NexoBrid	4,687	3,292	1,142
Directly to consumer | Biopsy kits and instruments - direct bill
Disaggregation of Revenue [Line Items]
Product sales, net	2,607	2,096	2,087
Directly to consumer | Epicel
Disaggregation of Revenue [Line Items]
Product sales, net	$ 32,066	$ 36,623	$ 31,574