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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease cost [1],[2] $ 153 $ 309
Finance lease cost:    
Amortization of leased assets 157 318
Interest on lease liabilities 8 18
Total finance lease cost $ 165 $ 336
[1] Includes short term lease costs of $13,000 and $29,000 for the three and six months ended June 30, 2019
[2] Includes short term lease costs of $32,000 and $66,000 for the three and six months ended June 30, 2019, respectively.