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Leases - Schedule of components of lease expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost [1] $ 889 $ 2,728
Finance lease cost:    
Amortization of right-of-use assets 78 232
Interest on lease liability 89 272
Total finance lease cost 167 504
Total lease cost $ 1,056 $ 3,232
[1] includes variable lease costs which are immaterial