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Leases - Lease costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Fixed lease cost $ 4,097 $ 1,431 $ 7,896 $ 3,078
Variable lease cost 890 184 1,914 488
Short-term lease cost 175 94 340 235
Total operating lease cost $ 5,162 $ 1,709 $ 10,150 $ 3,801