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Balance Sheet Details - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]    
Accrued compensation and benefits $ 15,260 $ 14,382
Accrued consulting and professional fees 9,395 9,488
Accrued research and development services 9,487 8,551
Accrued sales allowances 3,591 1,999
Other 2,511 1,609
Accrued liabilities $ 40,244 $ 36,029