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Leases - Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Operating lease costs $ 326 $ 296 $ 653 $ 380
Short term lease costs 31 29 62 67
Variable lease costs 195 92 572 149
Total lease costs $ 552 $ 417 $ 1,287 $ 596