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Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Accrued compensation and related costs $ 10,664 $ 12,703
Accrued professional services 3,186 3,489
Accrued development costs 1,543 1,468
Other accrued expenses 4,152 3,291
Total accrued liabilities $ 19,545 $ 20,951