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Summary of Significant Accounting Policies - Summary of Future Minimum Lease Payments (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Operating Lease Commitments  
2019 (excluding the nine months ended September 30, 2019) $ 1,936
2020 11,219
2021 11,470
2022 11,369
2023 8,743
Thereafter 43,257
Total lease payments 87,994
Less imputed interest (22,365)
Total $ 65,629