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Income Taxes - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2004 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Taxes [Line Items] |  |  |  |
Valuation allowance of deferred tax assets |  | $ 698,228,000 | $ 705,034,000 |
Change in the valuation allowance |  | 6,800,000 | 9,940,000 | $ 19,631,000
Federal operating loss carryforwards |  | 2,000,000,000 |  |
State operating loss carryforwards |  | 1,300,000,000 |  |
Federal operation loss carryforwards, not subject to expiration |  | $ 494,000,000 |  |
Operating loss carryforwards, limitations on use |  | Pursuant to IRC Sections 382 and 383, annual use of the Company’s federal and California net operating loss and research and development credit carryforwards may be limited in the event a cumulative change in ownership of more than 50% occurs within a three-year period. |  |
Net operating loss carryforwards | $ 105,800,000 |  |  |
Net operating loss and credit carryforwards, annual use limitation | $ 13,000,000 |  |  |
Research and development credit expired |  | 2023 |  |
Research and development credits expire |  | $ 1,100,000 |  |
Unrecognized income tax interest and penalties |  | 0 | $ 0 | $ 0
Federal |  |  |  |
Income Taxes [Line Items] |  |  |  |
Research and development credits not expire |  | $ 54,200,000 |  |
Research and development credits begin to expire |  | 2024 |  |
State |  |  |  |
Income Taxes [Line Items] |  |  |  |
Research and development credits not expire |  | $ 22,800,000 |  |
Connecticut |  |  |  |
Income Taxes [Line Items] |  |  |  |
Research and development credits not expire |  | $ 19,800,000 |  |

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