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Leases - Lease expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lease cost:    
Operating lease cost $ 269 $ 802
Short-term lease cost 6 30
Variable lease cost 53 165
Finance lease cost:    
Amortization of leased assets 134 386
Interest on lease liabilities 51 173
Total net lease cost $ 513 $ 1,556