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Leases - Components of Lease Expense (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 $ 643 $ 596 $ 1,935 $ 1,773
Short-term lease cost 96 47 245 137
Variable lease costs 67 105 282 304
Total lease expense $ 806 $ 748 $ 2,462 $ 2,214