Related Party Transactions (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Sublease income			$ (1,240)	$ (470)
General and administrative	$ 8,034	$ 9,042	22,181	$ 17,703
Prepaid expenses and other current assets	12,917		12,917				$ 7,129
Oxford Biomedica [Member]
Related Party Transaction [Line Items]
Sublease income	(900)		(1,200)
Expenses recognized under the transitional services	(200)		(200)
Amount due to OXB Solutions	100		100
General and administrative	1,400		2,000
Prepaid expenses and other current assets	4,500		4,500
Receivables from affiliates	3,200		3,200
Supply Agreement [Member]
Related Party Transaction [Line Items]
Recorded purchases			$ 7,000
Supply Agreement [Member] | Oxford Biomedica [Member]
Related Party Transaction [Line Items]
Clinical supply requirements			50.00%
Purchases of drug substance	1,500		$ 1,500
Recorded purchases	$ 6,900		$ 8,000
Supply Agreement [Member] | Oxford Biomedica [Member] | Forecast [Member]
Related Party Transaction [Line Items]
Purchase Commitment Amount					$ 29,700	$ 27,500