Revenue - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) pharmacy	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) pharmacy	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Number of specialty pharmacies | pharmacy	2		2
Allowance for doubtful accounts	$ 6,300		$ 6,300		$ 7,000
Change in estimate of uncollectible (percent)			0.50%
Change in revenue recognized due to 0.5% change in uncollectible percentage			$ 300
Product sales, net	38,326	$ 33,718	111,004	$ 106,025
MACI implants and kits | Time-and-materials contract | Time-and-materials contract
Disaggregation of Revenue [Line Items]
Product sales, net	$ 898	$ 644	$ 2,331	$ 1,901