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v3.25.1

Equity Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Black-Scholes Weighted Average Assumptions | The Black-Scholes weighted average assumptions for all stock option awards granted during 2024 and 2023 were as follows:
|  | 2024 |  |  | 2023 |
|  | 2021 Plan |  |  | Inducement Grants |  |  | 2021 Plan |
Fair Value of Awards |  | $ | 0.91 |  |  |  | 0.94 |  |  |  | 0.48 |
Grant Price |  | $ | 1.07 |  |  |  | 1.1 |  |  |  | 0.59 |
Expected term (in years) |  |  | 6.20 |  |  |  | 6.25 |  |  |  | 5.63 |
Risk‑free interest rate |  |  | 4.04 | % |  |  | 4.10 | % |  |  | 4.09 | %
Dividend yield |  |  | — | % |  |  | — | % |  |  | — | %
Expected volatility |  |  | 109.61 | % |  |  | 109.64 | % |  |  | 105.33 | %
Options Outstanding and Vested and Currently Exercisable by Exercise Prices | The options outstanding and vested and currently exercisable by exercise prices as of December 31, 2024 were as follows:
Options outstanding |  |  | Options vested and exercisable |
|  |  |  |  |  | Weighted |  |  |  |  |  | Weighted |  |  | Weighted |
|  |  |  |  |  | average |  |  | Number of |  |  | average |  |  | average |
Exercise |  |  | Outstanding |  |  | remaining |  |  | options |  |  | Exercise |  |  | remaining |
price |  |  | (in shares) |  |  | life years |  |  | vested |  |  | price |  |  | life years |
$ | 0.47 - 0.49 |  |  |  | 1,063,600 |  |  |  | 8.50 |  |  |  | 716,950 |  |  | $ | 0.49 |  |  |  | 8.50 |
| 0.50 - 0.80 |  |  |  | 565,321 |  |  |  | 9.05 |  |  |  | 22,867 |  |  |  | 0.59 |  |  |  | 8.47 |
| 0.81 - 1.33 |  |  |  | 564,450 |  |  |  | 9.40 |  |  |  | 20,325 |  |  |  | 0.88 |  |  |  | 8.42 |
| 1.34 - 1.74 |  |  |  | 210,846 |  |  |  | 2.26 |  |  |  | 85,335 |  |  |  | 1.67 |  |  |  | 2.45 |
| 1.75 - 3.14 |  |  |  | 164,325 |  |  |  | 7.70 |  |  |  | 57,225 |  |  |  | 2.64 |  |  |  | 7.53 |
| 3.15 - 3.60 |  |  |  | 237,614 |  |  |  | 2.49 |  |  |  | 237,614 |  |  |  | 3.24 |  |  |  | 2.49 |
| 3.61 - 13.00 |  |  |  | 168,063 |  |  |  | 5.75 |  |  |  | 168,063 |  |  |  | 9.68 |  |  |  | 5.74 |
|  |  |  |  | 2,974,219 |  |  |  | 7.65 |  |  |  | 1,308,379 |  |  |  | 2.35 |  |  |  | 6.62 |
Share-based Compensation Expense | The following table shows the stock-based compensation expense related to vested stock option grants to employees and non-employees awarded under the stock plans and inducement grants by financial statement line item on the accompanying statements of comprehensive loss:
|  | 2024 |  |  | 2023 |
Research and development |  | $ | 179,911 |  |  |  | 159,816 |
Sales and marketing |  |  | 48,379 |  |  |  | (948 | )
General and administrative |  |  | 215,857 |  |  |  | 516,832 |
Total share-based compensation expense |  | $ | 444,147 |  |  |  | 675,700 |
2021 Stock Option Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock Option Plan Activity | Activity under the stock option plans was as follows:
|  | Number of options |  |  | Weighted average exercise price |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2022 |  |  | 931,550 |  |  | $ | 3.97 |  |  |  |
Granted |  |  | 1,301,200 |  |  |  | 0.59 |  |  |  |
Forfeited |  |  | (130,720 | ) |  |  | 1.97 |  |  |  |
Outstanding at December 31, 2023 |  |  | 2,102,030 |  |  | $ | 2.00 |  |  |  |
Granted |  |  | 1,359,821 |  |  |  | 1.07 |  |  |  |
Forfeited |  |  | (487,632 | ) |  |  | 1.84 |  |  |  |
Outstanding at December 31, 2024 |  |  | 2,974,219 |  |  | $ | 1.60 |  |  |  | 847,758 |
Vested and exercisable at December 31, 2024 |  |  | 1,308,379 |  |  | $ | 2.35 |  |  |  | 453,514 |
Stock options granted under the 2021 Plan for the years ended December 31 2024 and 2023 were as follows:
|  | 2024 |  |  | 2023 |
Employee |  |  | 1,286,921 |  |  |  | 1,211,200 |
Nonemployee |  |  | 72,900 |  |  |  | 90,000 |
Total |  |  | 1,359,821 |  |  |  | 1,301,200 |
Inducement Grants [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock Option Plan Activity | The inducement grants are summarized as follows:
|  |  |  |  | Weighted |  |  | Weighted |
|  |  |  |  | average |  |  | average |
|  | Number of |  |  | exercise |  |  | remaining |
|  | options |  |  | price |  |  | life years |
Outstanding at December 31, 2023 |  |  | 150,000 |  |  | $ | 2.42 |  |  |  | 8.40 |
Granted |  |  | 100,000 |  |  |  | 1.10 |  |  |  | 9.12 |
Outstanding at December 31, 2024 |  |  | 250,000 |  |  | $ | 1.89 |  |  |  | 8.07 |
Vested and exercisable at December 31, 2024 |  |  | 75,000 |  |  | $ | 2.42 |  |  |  | 7.36 |

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