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Balance Sheet Details - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]    
Accrued consulting and professional fees $ 19,325 $ 9,395
Accrued compensation and benefits 17,028 15,260
Accrued research and development services 10,367 9,487
Accrued sales allowances 5,849 3,591
Other 3,829 2,511
Accrued liabilities $ 56,398 $ 40,244