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Commitments and Contingencies - Summary of Maturities of Sublease Income and Operating Lease Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Sublease Income |  |
2021 | $ 5,201 |
2022 | 5,357 |
2023 | 5,518 |
2024 | 5,684 |
2025 | 5,854 |
Thereafter | 33,742 |
Total | 61,356 |
Operating Lease Liabilities |  |
2021 | 6,942 |
2022 | 6,268 |
2023 | 5,403 |
2024 | 5,547 |
2025 | 5,696 |
Thereafter | 30,760 |
Total | 60,616 |
Present value adjustment | (22,580) |
Total | $ 38,036 | $ 40,884

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