Revenue - Schedule of Accounts Receivable, Unbilled Services, and Deferred Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts receivable:
Accounts receivable, beginning balance	$ 96,210	$ 454,993
Additions	1,472,768	1,768,457
Deductions	(1,264,062)	(2,127,240)
Accounts receivable, ending balance	304,916	96,210
Allowance for doubtful accounts:
Allowance for doubtful accounts, beginning balance	(13,835)	0
Additions		(13,835)
Deductions	6,159	0
Allowance for doubtful accounts, end balance	(7,676)	(13,835)
Deferred revenue
Deferred revenue, beginning balance	549,551	1,595,472
Additions	581,569	46,908
Deductions	(267,599)	(1,092,829)
Deferred revenue, ending balance	863,521	549,551
Disaggregation of Revenue [Line Items]
Bad debt expense		13,835
Deductions	6,159	0
Deferred revenue, current	241,310	370,137	$ 1,400,000
Deferred revenue, noncurrent	622,210	179,414	172,500
Deferred revenue	863,521	549,551	$ 1,595,472
Revenue
Deferred revenue
Deferred revenue, beginning balance	273,800
Deferred revenue, ending balance	151,100	273,800
Disaggregation of Revenue [Line Items]
Deferred revenue	151,100	273,800
Gavi Advance Purchase Agreement- COVAX Facility
Disaggregation of Revenue [Line Items]
Collaboration agreement upfront payment amount	696,400	697,400
Amended and Restated UK Supply Agreement
Disaggregation of Revenue [Line Items]
Collaboration agreement upfront payment amount	$ 112,500	$ 819,000