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Leases - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease cost $ 1,011 $ 995 $ 3,423 $ 3,337
Short-term lease cost 6 45 19 771
Variable lease cost 227 329 779 925
Sublease income (84) (84) (252) (252)
Total lease cost $ 1,160 $ 1,285 3,969 4,781
Cash paid for amounts included in the measurement of lease liabilities     3,063 4,084
Right-of-use assets obtained in exchange for lease obligations—operating leases     $ 3,207 $ 7,578