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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | 10. Stock-Based Compensation From time to time, we issue stock options and restricted stock as compensation for services rendered by our directors and employees. Restricted Stock On March 28, 2025, we granted 73,000 shares of restricted common stock to certain employees. The grants of restricted common stock were made in accordance with the 2015 Plan and 2024 Plan and were subject to vesting, as follows: 24,327 shares vested on March 28, 2025; 24,327 shares vest on March 28, 2026, and 24,346 shares vest on March 28, 2027. As of March 28, 2025, 6,872 shares, representing an amount of $83,299, were surrendered to the Company by grant recipients in satisfaction of tax withholding obligations, and subsequently cancelled. On March 19, 2024, we granted 127,500 shares of restricted common stock to certain employees. The grants of restricted common stock were made in accordance with the 2015 Plan and were subject to vesting, as follows: 42,495 shares vested on March 19, 2024; 42,495 shares vest on April 2, 2025, and 42,510 shares vest on April 2, 2026. As of April 2, 2025, 12,599 shares, representing an amount of $179,925, were surrendered to the Company by grant recipients in satisfaction of tax withholding obligations, and subsequently cancelled. As of April 2, 2024, 10,315 shares, representing an amount of $69,526 were surrendered to the Company by grant recipients in satisfaction of tax withholding obligations, and subsequently cancelled. Stock compensation is being recognized over the vesting period. For the three and nine months ended September 30, 2025, $156,558 and $743,977, respectively, was recorded on the issuance of the common stock. For the three and nine months ended September 30, 2024, respectively, $136,019 and $669,937 was recorded on the issuance of the common stock. Stock Options On June 21, 2025, we granted non-employee directors stock options to purchase 27,000 shares at an exercise price of $12.88 per share under the 2023 Non-Employee Director Compensation Plan. The options fully vested upon grant. The total fair value of $246,282 for these stock options was recognized as expense upon grant. The weighted-average grant date fair value of options granted during the nine months ended September 30, 2025 was $9.12. The assumptions that were used in calculating such values, were based on estimates at the grant date in the table as follows: Schedule of Estimated Values of Stock Option Grants Valuation Assumptions
|  | Grant Date June 21, 2025 |
Risk-free interest rate |  |  | 3.96 | %
Expected term |  |  | 5 years |
Expected volatility |  |  | 88.39 | %
Expected dividend yield |  |  | 0.00 | %
On August 16, 2024, we granted non-employee directors stock options to purchase 36,000 shares at an exercise price of $8.78 per share, the fair market value of the shares on the grant date, under the 2023 Non-Employee Director Compensation Plan, with 100% vesting upon grant. The total fair value of $241,735 for these stock options was recognized upon grant. On September 4, 2024, we granted employees stock options to purchase 14,500 shares at an exercise price of $10.12 per share, the fair market value of the shares on the grant date, under the 2015 Plan, with annual vesting through 2027 based on service time. The total fair value of $118,347 for these stock options is being recognized over the vesting period. The weighted-average grant date fair value of options granted during the nine months ended September 30, 2024 was $7.13. The assumptions that were used in calculating such values, were based on estimates at the grant date in the table as follows:
|  | Grant Date August 16, 2024 |  |  | Grant Date September 4, 2024 |
Risk-free interest rate |  |  | 3.77 | % |  |  | 3.61 | %
Weighted average expected term |  |  | 5 years |  |  |  | 6 years |
Expected volatility |  |  | 100.97 | % |  |  | 101.00 | %
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
A summary of stock option activity during the nine months ended September 30, 2025 and 2024 is as follows: Schedule of Stock Options Activity
|  |  |  |  |  |  |  | Weighted- |
|  |  |  |  | Weighted- |  |  | Average |
|  | Shares |  |  | Average |  |  | Remaining |
|  | Under |  |  | Exercise |  |  | Contractual |
|  | Option |  |  | Price |  |  | Life |
Outstanding at January 1, 2025 |  |  | 374,411 |  |  | $ | 6.22 |  |  |  | 8 years |
Exercised |  |  | (37,488 | ) |  |  | 5.13 |  |  |  |  |
Granted |  |  | 27,000 |  |  |  | 12.88 |  |  |  |  |
Forfeited |  |  | (4,000 | ) |  |  | 4.63 |  |  |  |  |
Outstanding at September 30, 2025 |  |  | 363,923 |  |  | $ | 6.83 |  |  |  | 7 years |
Exercisable at September 30, 2025 |  |  | 354,208 |  |  | $ | 6.74 |  |  |  | 6 years |
|  |  |  |  |  |  |  | Weighted- |
|  |  |  |  | Weighted- |  |  | Average |
|  |  |  |  | Average |  |  | Remaining |
|  | Shares |  |  | Exercise |  |  | Contractual |
|  | Under Option |  |  | Price |  |  | Life |
Outstanding at January 1, 2024 |  |  | 357,887 |  |  | $ | 5.69 |  |  |  | 8 years |
Granted |  |  | 50,500 |  |  |  | 9.16 |  |  |  |  |
Forfeited |  |  | (4,000 | ) |  |  | 4.63 |  |  |  |  |
Outstanding at September 30, 2024 |  |  | 404,387 |  |  | $ | 6.14 |  |  |  | 7 years |
Exercisable at September 30, 2024 |  |  | 314,888 |  |  | $ | 5.97 |  |  |  | 7 years |
During the three and nine months ended September 30, 2025 and 2024, stock-based compensation for options was $9,862 and $387,914, respectively, and $354,006 and $584,918, respectively. As of September 30, 2025 and December 31, 2024, there were $75,612 and $213,247, respectively, of total unrecognized compensation costs related to stock options granted under our stock option agreements. The unrecognized compensation cost is expected to be recognized over a weighted-average period of two years. The total fair value of stock options that vested during the nine months ended September 30, 2025 and 2024 was $676,102 and $696,620, respectively.

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