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Leases - Summary of Operating Lease Costs (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Lease Cost [Abstract]        
Operating lease cost $ 1,271 $ 1,170 $ 2,546 $ 2,168