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Leases - Schedule of Operating Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease cost (including variable costs) $ 2,501 $ 1,604 $ 7,012 $ 4,660
Variable costs including non-lease component $ 407 $ 748 1,576 2,051
Cash paid for amounts included in the measurement of operating lease liabilities (included in net cash used in operating activities in thousands):        
Operating cash flows from operating leases     $ 3,443 $ 3,068