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Lease Obligations - Schedule of lease costs (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Leases [Abstract]        
Operating lease cost $ 95   $ 95  
Amortization of leased assets 292 $ 249 584 $ 498
Interest on lease liabilities 166 179 340 366
Net lease cost $ 553 $ 428 $ 1,019 $ 864