Regeneron License and Collaboration Arrangement - Summary of Change in Company's Contract Liabilities (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Contract Asset
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Additions			$ 10,000
Additions (Deductions)	[1]		(10,000)
Contract Liability
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Balance at beginning of period		$ 13,980	21,883
Additions			10,000
Additions (Deductions)		(9,175)	(17,903)	[1]
Balance at end of period		$ 4,805	$ 13,980

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