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License and Collaboration Agreements - Changes in Deferred Revenue Balance from Collaboration Agreements (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Deferred revenue, Beginning balance $ 24,636
Recognition of previously unearned revenue (9,465)
Deferred revenue, Ending balance $ 15,171