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Leases - Schedule of lease cost (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Leases [Abstract]    
Operating lease cost $ 1,722 $ 1,666
Short-term lease cost 481 574
Variable lease cost 431 394
Net lease cost $ 2,634 $ 2,634