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Leases - Components of lease expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lease Cost    
Operating lease cost $ 1,345 $ 4,241
Short-term lease cost 114 415
Variable lease cost 99 279
Total lease cost $ 1,558 $ 4,935