Related Party Transactions (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Sublease income			$ 1,210	$ 705
General and administrative	$ 7,810	$ 8,351	29,991	$ 26,054
Prepaid expenses and other current assets	12,130		12,130				$ 7,129
Oxford Biomedica [Member]
Related Party Transaction [Line Items]
Sublease income			1,200
Expenses recognized under the transitional services	(200)		(500)
Amount due to OXB Solutions	100		100
General and administrative	800		1,700
Prepaid expenses and other current assets	5,500		5,500
Receivables from affiliates	3,700		3,700
Supply Agreement [Member]
Related Party Transaction [Line Items]
Recorded purchases			$ 7,300
Supply Agreement [Member] | Oxford Biomedica [Member]
Related Party Transaction [Line Items]
Clinical supply requirements			50.00%
Purchases of drug substance	6,000		$ 7,500
Recorded purchases	$ 2,200		$ 10,200
Supply Agreement [Member] | Oxford Biomedica [Member] | Forecast [Member]
Related Party Transaction [Line Items]
Purchase Commitment Amount					$ 29,700	$ 27,500