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Leases - Lease costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]        
Fixed lease cost $ 1,970 $ 835 $ 4,089 $ 1,647
Variable lease cost 507 161 734 304
Short-term lease cost 88 88 165 141
Total operating lease cost $ 2,565 $ 1,084 $ 4,988 $ 2,092