Revenue - Summary of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Product sales, net	$ 45,581	$ 38,326	$ 132,520	$ 111,004
NexoBrid	0	225	0	667
Total revenue	45,581	38,551	132,520	111,671
Accounting Standards Update 2014-09 | Change in estimates related to prior periods
Disaggregation of Revenue [Line Items]
Product sales, net	2,275	(428)	1,945	1,142
M A C I Implants and kits
Disaggregation of Revenue [Line Items]
Product sales, net	37,589	31,009	108,114	85,617
Through Intermediary | MACI implants and kits | Contract rate
Disaggregation of Revenue [Line Items]
Product sales, net	22,598	19,377	68,220	50,718
Through Intermediary | MACI implants and kits | Time-and-materials contract
Disaggregation of Revenue [Line Items]
Product sales, net	5,030	4,207	13,526	12,015
Time-and-materials contract | MACI implants and kits | Time-and-materials contract
Disaggregation of Revenue [Line Items]
Product sales, net	1,432	898	2,974	2,331
Provider or Facility | MACI implants and kits | Contract rate
Disaggregation of Revenue [Line Items]
Product sales, net	5,797	6,457	19,932	17,846
Provider or Facility | NexoBrid
Disaggregation of Revenue [Line Items]
NexoBrid	598	225	598	667
Directly to consumer | Biopsy kits
Disaggregation of Revenue [Line Items]
Product sales, net	457	498	1,517	1,565
Directly to consumer | Epicel
Disaggregation of Revenue [Line Items]
Product sales, net	$ 7,394	$ 7,317	$ 23,808	$ 25,387