Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Components of Deferred Revenue (Detail)

v3.19.1
Balance Sheet Components - Components of Deferred Revenue (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue $ 21,372 $ 28,901
Grant Agreements    
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue 0 0
Research And Development Agreements    
Deferred Revenue Arrangement [Line Items]    
Total deferred revenue $ 21,372 $ 28,901