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Leases - Operating lease costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases        
Operating lease costs $ 1,232 $ 1,693 $ 2,566 $ 3,575
Variable lease costs 37 2 57 12
Total lease costs $ 1,269 $ 1,695 $ 2,623 $ 3,587