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Commitments and Contingencies - Narratives (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2023	Jun. 30, 2023	Dec. 31, 2021	Mar. 01, 2023
Commitments and Contingencies
Financing liability		$ 1,821
Accrued settlement		200
Penn License Agreement | Penn
Commitments and Contingencies
Annual payments to be made		25,000	$ 10,000
Additional milestone payments for first CAR-M product		1,700
Penn License Agreement | Penn | Maximum
Commitments and Contingencies
Milestone payments		10,900
Additional milestone payments		30,000
Novartis Agreement
Commitments and Contingencies
Agreement term	5 years
Renewal term	1 year
Amount payable per calendar year for reserved capacity				$ 1,000
Termination fee payable				$ 4,000
Lab Equipment
Commitments and Contingencies
Financing liability		$ 2,600

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