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Leases - Schedule of Additional Information of Operating Leases (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Cash paid for amounts included in the measurement of lease liabilities $ 1,343 $ 4,029
ROU assets obtained in exchange for new liabilities $ 1,066 $ 3,119