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Stock Option Plans (Tables) | 9 Months Ended
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Sep. 30, 2023
Stock Option Plans |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Options Outstanding
​ |  | ​ |  | ​ |  | Weighted ‑
​ | ​ | Shares | ​ | ​ | ​ | Average
​ | ​ | Available | ​ | Number of | ​ | Exercise
​ |  | for Grant |  | Options |  | Price
Balance at December 31, 2022 |  | 4,017,011 |  | 7,006,250 | ​ | $ | 5.25
Additional shares authorized |  | 1,862,000 |  | — | ​ |  | —
Options granted |  | (1,002,000) |  | 1,002,000 | ​ |  | 1.10
Options exercised |  | — |  | (23,168) | ​ |  | 0.52
Options forfeited |  | 222,410 |  | (222,410) | ​ |  | 5.98
Balance at September 30, 2023 |  | 5,099,421 |  | 7,762,672 | ​ | $ | 4.71
​

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