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Commitments and Contingencies - Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]    
Operating lease cost $ 1,868 $ 1,351
Variable lease cost 210 139
Total lease costs $ 2,078 $ 1,490