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Leases - Lease Cost (Details) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease expense $ 557 $ 1,110
Short-term lease expense 22 41
Variable lease expense 95 184
Total lease expense $ 674 $ 1,335