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Leases - Operating lease costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Leases        
Operating lease costs $ 1,298 $ 1,308 $ 2,660 $ 2,572
Variable lease costs 49 10 51 10
Total lease costs $ 1,347 $ 1,318 $ 2,711 $ 2,582