Regeneron License and Collaboration Arrangement - Summary of Change in Company's Contract Liabilities (Details) - Contract Liability - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Balance at beginning of period		$ 4,805	$ 13,980
Additions (Deductions) (1)	[1]	(4,805)	(833)
Balance at end of period		$ 0	$ 13,147

[1] Deductions to contract liabilities relate to deferred revenue recognized as revenue during the reporting period. Deductions are shown net of additions that 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 six months ended June 30, 2021.