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Stock Option Plan (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Stock Option Plan [Abstract] |  |
Schedule of Activity Under the Plan is Set Forth | Activity under the Plan is set forth below:
|  | Options Outstanding |
Stock Option Activity |  | Shares Available for Grant |  |  | Number of Options |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Term (in years) |
Balances at January 1, 2025 |  |  | 1,560,091 |  |  |  | 2,972,055 |  |  | $ | 0.40 |  |  |  | 3.00 |
Options granted |  |  | (1,560,091 | ) |  |  | 1,560,091 |  |  | $ | 1.26 |  |  |  |  |
Options exercised |  |  | — |  |  |  | — |  |  | $ | — |  |  |  |  |
Options expired |  |  | — |  |  |  | — |  |  | $ | — |  |  |  |  |
Options cancelled/forfeited |  |  | 11,896 |  |  |  | (11,896 | ) |  | $ | 0.63 |  |  |  |  |
Balances at June 30, 2025 |  |  | 11,896 |  |  |  | 4,520,250 |  |  | $ | 0.70 |  |  |  | 6.48 |
Exercisable at June 30, 2025 |  |  |  |  |  |  | 2,364,814 |  |  | $ | 1.04 |  |  |  | 5.48 |
Vested and expected to vest at June 30, 2025 |  |  |  |  |  |  | 4,520,250 |  |  |  | 0.70 |  |  |  | 6.48 |
|  | Options Outstanding |
Stock Option Activity |  | Shares Available for Grant |  |  | Number of Options |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Term (in years) |
Balances at December 31, 2023 |  |  | 1,550,091 |  |  |  | 2,982,055 |  |  | $ | 0.40 |  |  |  | 3.70 |
Options granted |  |  | — |  |  |  | — |  |  | $ | — |  |  |  |  |
Options exercised |  |  | — |  |  |  | — |  |  | $ | — |  |  |  |  |
Options expired |  |  | 10,000 |  |  |  | (10,000 | ) |  | $ | 0.001 |  |  |  |  |
Options cancelled/forfeited |  |  | — |  |  |  | — |  |  | $ | — |  |  |  |  |
Balances at June 30, 2024 |  |  | 1,560,091 |  |  |  | 2,972,055 |  |  | $ | 0.40 |  |  |  | 3.53 |
Exercisable at June 30, 2024 |  |  |  |  |  |  | 1,464,429 |  |  | $ | 0.49 |  |  |  | 4.88 |
Vested and expected to vest at June 30, 2024 |  |  |  |  |  |  | 2,972,055 |  |  |  | 0.40 |  |  |  | 3.53 |
| Activity under the Plan is set forth below:
|  | Options Outstanding |
Stock Option Activity |  | Shares Available for Grant |  |  | Number of Options |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Term (in years) |
Balances at January 1, 2024 |  |  | 1,550,091 |  |  |  | 2,982,055 |  |  | $ | 0.40 |  |  |  | 3.70 |
Options granted |  |  | — |  |  |  | — |  |  | $ | — |  |  |  |  |
Options exercised |  |  | — |  |  |  | — |  |  | $ | — |  |  |  |  |
Options expired |  |  | 10,000 |  |  |  | (10,000 | ) |  | $ | 0.001 |  |  |  |  |
Options cancelled/forfeited |  |  | — |  |  |  | — |  |  | $ | — |  |  |  |  |
Balances at December 31, 2024 |  |  | 1,560,091 |  |  |  | 2,972,055 |  |  | $ | 0.40 |  |  |  | 3.00 |
Exercisable at December 31, 2024 |  |  |  |  |  |  | 1,548,910 |  |  | $ | 0.49 |  |  |  | 4.32 |
Vested and expected to vest at December 31, 2024 |  |  |  |  |  |  | 2,972,055 |  |  |  | 0.40 |  |  |  | 3.00 |
Schedule of Stock Compensation Expense by Function Recognized for the Years | The following table is a summary of stock compensation expense by function recognized for the three and six months ended June 30, 2025 and 2024 (in thousands):
|  | Six months ended June 30, |
|  | 2025 |  |  | 2024 |
General Administrative |  | $ | 33 |  |  | $ | 4 |
Research and development |  |  | 54 |  |  |  | 7 |
|  | $ | 87 |  |  | $ | 11 |
|  | Three months ended June 30, |
|  | 2025 |  |  | 2024 |
General Administrative |  | $ | 31 |  |  | $ | 2 |
Research and development |  |  | 51 |  |  |  | 4 |
|  | $ | 82 |  |  | $ | 6 |
| The following table is a summary of stock compensation expense by function recognized for the years ended December 31, 2024 and 2023 (in thousands):
|  | Years ended December 31, |
|  | 2024 |  |  | 2023 |
General Administrative |  | $ | 7 |  |  | $ | 10 |
Research and development |  |  | 14 |  |  |  | 23 |
|  | $ | 21 |  |  | $ | 33 |

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