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Commitments -Summary of Future Minimum Lease Payments under Non-Cancelable Operating Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2019 $ 2,041
2020 2,105
2021 2,195
2022 2,265
2023 2,339
2024 and beyond 4,487
Total $ 15,432