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Commitments and Contingencies - Future Payments under Obligation (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]    
2019 $ 5,308 $ 1,282
2020 6,180 638
2021   638
2022   192
Total $ 11,488 $ 2,750