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Leases - Lease Costs (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 costs $ 326 $ 333 $ 980 $ 712
Short term lease costs 32 29 94 96
Variable lease costs 231 172 803 322
Total lease costs $ 589 $ 534 $ 1,877 $ 1,130