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Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accrued compensation and related costs $ 9,082 $ 10,765
Accrued professional services 4,337 4,544
Accrued development costs 1,804 1,965
Other accrued expenses 3,226 2,526
Total accrued liabilities $ 18,449 $ 19,800