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Commitments and Contingencies - Future Minimum Lease Payments (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Commitments And Contingencies Disclosure [Abstract] |  |
2020 | $ 507 |
2021 | 517 |
2022 | 527 |
2023 | 715 |
2024 | 730 |
Thereafter | 3,533 |
Total | $ 6,529 |
2019 |  | $ 498
2020 |  | 508
2021 |  | 518
2022 |  | 529
2023 |  | 716
Thereafter |  | 4,203
Total |  | $ 6,972

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