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Leases - Summary of Operating and Finance Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Operating lease costs:    
Fixed $ 259 $ 411
Short term 9 27
Total 268 438
Finance lease costs:    
Amortization of ROU asset 91 182
Interest 5 11
Total $ 96 $ 193