Regeneron License and Collaboration Arrangement - Summary of Change in Company's Contract Liabilities (Details) - Contract Liability - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Balance at beginning of period		$ 4,805	$ 13,980
Additions (Deductions) (1)	[1],[2]	(4,805)	(3,981)
Balance at end of period		$ 0	$ 17,961

[1] Additions are the result of a reduction to cumulative revenue recognized as a result of a change in overall estimated costs, primarily due to an extension of time to fulfill the combined performance obligation, which was recorded as a change in estimate during the three months ended March 31, 2021.

[2] Deductions to contract liabilities relate to deferred revenue recognized as revenue during the reporting period.