| Schedule of stock-based compensation expense for stock options |
Stock-based compensation expense recognized in selling, general, and administrative, and research and development are as follows: | | | | | | | | | | | | | | | | | | | Three Months Ended March 31, | | | | 2026 | | 2025 | | | | | | Options | $ | 1,682 | | | $ | 554,659 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Total | $ | 1,682 | | | $ | 554,659 | | | | | |
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| Schedule of stock option activity |
The following is a summary of the stock option activity under the 2010 Plan for the three months ended March 31, 2026: | | | | | | | | | | | | | | | | | | | | | | | | | Shares | | Weighted- Average Exercise Price per Share($) | | Weighted- Average Remaining Contractual Term (Years) | | Aggregate Intrinsic Value($) | | Outstanding - December 31, 2025 | 12 | | | 1,250,911.84 | | | 2.90 | | — | | | Granted | — | | | — | | | — | | | — | | | Exercised | — | | | — | | | — | | | — | | | Forfeited | — | | | — | | | — | | | — | | | Expired/Cancelled | (1) | | | 1,199,983.10 | | | — | | | — | | | Outstanding - March 31, 2026 | 11 | | | 1,257,054.00 | | | 2.99 | | — | | | | | | | | | | | Options Exercisable at March 31, 2026 | 11 | | | 1,257,054.00 | | | 2.99 | | — | | Options Vested at March 31, 2026 | 11 | | | 1,257,054.00 | | | 2.99 | | — | | | | | | | | | |
The following is a summary of the stock option activity under the 2020 Plan for the three months ended March 31, 2026: | | | | | | | | | | | | | | | | | | | | | | | | | Shares | | Weighted- Average Exercise Price per Share ($) | | Weighted- Average Remaining Contractual Term (Years) | | Aggregate Intrinsic Value($) | | Outstanding - December 31, 2025 | 10,467 | | | 3,262.29 | | | 9.88 | | — | | | Granted | — | | | — | | | — | | | — | | | Exercised | — | | | — | | | — | | | — | | | Forfeited | — | | | — | | | — | | | — | | | Expired/Cancelled | (1) | | | 2,376,000.00 | | | — | | | — | | | Outstanding - March 31, 2026 | 10,467 | | | 3,136.34 | | | 9.64 | | — | | | | | | | | | | | Options Exercisable at March 31, 2026 | 10,467 | | | 3,127.63 | | | 9.64 | | — | | Options Vested at March 31, 2026 | 10,467 | | | 3,136.34 | | | 9.64 | | — | | | | | | | | | |
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