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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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