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Leases - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]        
Operating lease cost $ 1,255 $ 1,158 $ 2,412 $ 2,342
Short-term lease cost 7 311 13 726
Variable lease cost 262 296 552 596
Sublease income (84) (84) (168) (168)
Total lease cost $ 1,440 $ 1,681 2,809 3,496
Cash paid for amounts included in the measurement of lease liabilities     1,622 2,557
Right-of-use assets obtained in exchange for lease obligations—operating leases     $ 3,207 $ 2,802