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Leases - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost $ 1,078 $ 3,162
Short-term lease cost 2 12
Variable lease cost 49 234
Total lease cost 1,129 3,408
RoU assets obtained in exchange for new operating lease liabilities (non-cash) 676 2,752
Operating (use of cash) from operating leases $ (1,120) $ (3,192)