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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accrued Liabilities Current [Abstract]    
Payroll and related benefits $ 6,250 $ 8,926
Professional fees 1,101 1,541
Income taxes payable 74 1,447
Other 3,549 1,947
Accrued expenses and other current liabilities, Total $ 10,974 $ 13,861