Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Components of Deferred Revenue (Detail)

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Balance Sheet Components - Components of Deferred Revenue (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue $ 3,585 $ 1,870
Grant Agreement    
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue 2,493 620
Collaboration Agreements    
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue $ 1,092 $ 1,250