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Leases - Components of Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease cost $ 970 $ 1,944
Short-term lease cost 65 238
Variable lease cost 560 942
Total lease cost $ 1,595 $ 3,124