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Commitments - Summary of Future Minimum Lease Payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 3,756
2020 3,891
2021 3,979
2022 4,052
2023 4,023
Thereafter 15,952
Total $ 35,653