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Balance Sheet Components - Summary of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]    
Development costs $ 23,679 $ 23,473
Employee-related expenses 9,250 15,838
Professional services 6,195 3,166
Other accrued expenses 457 124
Total accrued expenses $ 39,581 $ 42,601