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Leases - Operating lease costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Leases        
Operating lease costs $ 1,119 $ 1,283 $ 3,744 $ 3,855
Variable lease costs 40   91 10
Total lease costs $ 1,159 $ 1,283 $ 3,835 $ 3,865