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Stock Incentive and Employee Benefit Plan (Additional Information) (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2024 | Feb. 13, 2023 | Oct. 17, 2022 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Jan. 17, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of option outstanding to purchase common stock |  |  |  | 34,361,000 |  | 34,361,000 |  | 33,124,000 |
Common stock, shares outstanding |  |  |  | 131,721,935 |  | 131,721,935 |  | 100,015,665 |
Options granted weighted-average grant date fair value |  |  |  |  |  | $ 0.81 |  |  |
Total intrinsic value of option exercise |  |  |  |  |  | $ 19,200 |  |  |
Stock-based compensation expenses |  |  |  |  |  | 10,884,000 | $ 10,813,000 |  |
Employee benefit plan contributions by employer |  |  |  |  |  | 500,000 | 300,000 |  |
Stock issued for services, shares | 10,000,000 | 4,000,000 |  |  |  |  |  |  |
Accrued legal fees |  |  |  | $ 0 |  | $ 0 |  |  |
2022 Equity Incentive Plan |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of option outstanding to purchase common stock |  |  |  | 34,361,475 |  | 34,361,475 |  |  |
Common stock shares reserved for future issuance |  |  |  | 20,129,644 |  | 20,129,644 |  |  |
2023 Inducement Plan |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  |  |  |  |  |  |  | 1,400,000
Stock-based compensation expenses |  |  |  | $ 3,700,000 | $ 3,500,000 | $ 10,900,000 | 10,800,000 |  |
Unrecognized compensation cost related to unvested stock option grants |  |  |  | $ 31,500,000 |  | $ 31,500,000 |  |  |
Weighted average period over grant |  |  |  |  |  | 2 years 7 months 6 days |  |  |
2022 Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock shares reserved for future issuance |  |  |  | 2,875,759 |  | 2,875,759 |  |  |
Stock-based compensation expenses |  |  |  | $ 74,200 | $ 0 | $ 196,300 | $ 0 |  |
Shares issued under ESPP, shares |  |  |  |  |  | 167,369 |  |  |
Purchase price of the common stock percentage |  |  | 85.00% |  |  |  |  |  |
2022 Employee Stock Purchase Plan | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock shares reserved for future issuance |  |  |  | 4,476,601 |  | 4,476,601 |  |  |
Semnur 2024 Stock Option Plan |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock shares reserved for future issuance |  |  |  | 40,000,000 |  | 40,000,000 |  |  |

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