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Balance Sheet Details - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]    
Accrued consulting and professional fees $ 16,086 $ 9,395
Accrued compensation and benefits 11,805 15,260
Accrued research and development services 8,900 9,487
Accrued sales allowances 5,853 3,591
Other 3,237 2,511
Accrued liabilities $ 45,881 $ 40,244