License and Collaboration Agreements - Changes in Deferred Revenue Balance from Collaboration Agreements (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred revenue, Beginning balance	$ 8,071
Recognition of previously unearned revenue	(5,516)
Deferred revenue, Ending balance	$ 2,555