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Leases - Schedule of Lease costs (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Leases [Abstract]        
Operating lease cost $ 203 $ 0 $ 298 $ 0
Amortization of leased assets 274 261 858 759
Interest on lease liabilities 170 176 510 542
Net lease cost $ 647 $ 437 $ 1,666 $ 1,301