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Leases - Summary of Operating Lease Costs (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Lease Cost [Abstract]        
Operating lease cost $ 1,298 $ 1,153 $ 3,844 $ 3,321