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Leases - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease cost $ 735 $ 1,011 $ 2,537 $ 3,423
Short-term lease cost 0 6 12 19
Variable lease cost 207 227 754 779
Sublease income (84) (84) (252) (252)
Total lease cost $ 858 $ 1,160 3,051 3,969
Cash paid for amounts included in the measurement of lease liabilities     3,291 3,063
Right-of-use assets obtained in exchange for lease obligations—operating leases     $ 1,777 $ 3,207