Restructuring - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Impairment of clinical trial assets			$ 1,974	$ 0
Impairment of goodwill			535	0
Restructuring expenses incurred	$ 208	$ 0	3,464	$ 0
Regenerative Medicine
Restructuring Cost and Reserve [Line Items]
Impairment of goodwill			535
June 2023 Restructuring
Restructuring Cost and Reserve [Line Items]
Severance arrangements	1,800		2,100
Impairment of clinical trial assets			2,100
June 2023 Restructuring | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	300		300
June 2023 Restructuring | Termination of Contract
Restructuring Cost and Reserve [Line Items]
Restructuring expenses incurred	200		$ 800
Adjustment to reduce accrual of contract termination costs	$ 200