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Leases - Description of Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Finance Lease Cost    
Amortization of finance lease right-of-use assets $ 4 $ 19
Interest on finance lease obligations 3 12
Operating lease costs 410 820
Total $ 417 $ 851