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Commitments and Contingencies - Future Commitments (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Remaining 2019 $ 2,400
2020 3,125
2021 2,700
2022 0
2023 0
2024 and thereafter 0
Total $ 8,225