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Leases - Lease Cost and Other Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Leases [Abstract]    
Operating lease cost $ 1,472 $ 2,899
Short-term lease cost 326 [1] 803 [1]
Total lease cost 1,798 3,702
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash flows from operating leases $ (1,472) $ (2,899)
Weighted-average remaining lease term (years) for operating leases 4 years 4 years
Weighted-average discount rate (2) operating leases 8.00% [2] 8.00% [2]
[1] Includes an immaterial amount of variable lease cost.
[2] Our discount rate is primarily based on our incremental borrowing rate in accordance with ASC 842.