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Leases - Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Lease Costs      
Operating lease costs $ 2,482 $ 2,418 $ 2,070
Variable lease costs 629 677 538
Total lease costs $ 3,111 $ 3,095 $ 2,608