Goodwill and Intangible Assets, Net - Schedule Of Carrying Values Of Goodwill Assigned To Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Balance at beginning of year			$ 119,694		$ 119,694	$ 123,304
Impairment	$ (82,714)	$ 0	(29,633)	$ (3,610)	(112,347)	(3,610)
Balance at end of year				119,694	7,347	119,694
Cell Therapy
Goodwill [Line Items]
Balance at beginning of year			112,347		112,347	112,347
Impairment					(112,347)
Balance at end of year				112,347	0	112,347
Degenerative Disease
Goodwill [Line Items]
Balance at beginning of year						3,610
Impairment						(3,610)
Biobanking
Goodwill [Line Items]
Balance at beginning of year			$ 7,347		7,347	7,347
Balance at end of year				$ 7,347	$ 7,347	$ 7,347