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Leases - Operating lease costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases        
Operating lease costs $ 1,151 $ 1,652 $ 3,717 $ 5,237
Variable lease costs 67   124 12
Total lease costs $ 1,218 $ 1,652 $ 3,841 $ 5,249