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Commitments and Contingencies - Summary of Maturities of Sublease Income and Operating Lease Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Sublease Income |  |
2020 (remaining) | $ 1,286 |
2021 | 5,201 |
2022 | 5,357 |
2023 | 5,518 |
2024 | 5,684 |
Thereafter | 39,596 |
Total | 62,642 |
Operating Lease Liabilities |  |
2020 (remaining) | 1,730 |
2021 | 6,925 |
2022 | 6,239 |
2023 | 5,377 |
2024 | 5,521 |
Thereafter | 36,373 |
Total | 62,165 |
Present value adjustment | (23,497) |
Total | $ 38,668 | $ 40,884

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