Annual report pursuant to Section 13 and 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
Dec. 31, 2018
Dec. 31, 2017
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue $ 28,901 $ 2,765
Grant Agreements    
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue 0 1,673
Research And Development Agreements    
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue $ 28,901 $ 1,092