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License and Collaboration Agreements - Changes in Deferred Revenue Balance from Collaboration Agreements (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Deferred revenue, Beginning balance | $ 24,636
Recognition of previously unearned revenue | (6,715)
Deferred revenue, Ending balance | $ 17,921

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