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Leases - Operating lease costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Leases        
Operating lease costs $ 1,308 $ 1,232 $ 2,572 $ 2,566
Variable lease costs 10 37 10 57
Total lease costs $ 1,318 $ 1,269 $ 2,582 $ 2,623