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Commitments and Contingencies - Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]        
Operating lease cost $ 843 $ 877 $ 2,581 $ 2,645
Variable lease cost 65 112 135 336
Short-term lease cost 237 71 368 206
Total lease cost $ 1,145 $ 1,060 $ 3,084 $ 3,187