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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Stock-Based Compensation |
Schedule of Stock option plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2014 | ​ | 2023 | ​ | ​
​ |  | Plan |  | Plan |  | Total
Outstanding or Exercised as of December 31, 2021 |  | 11,184,450 |  | — |  | 11,184,450
Available for future issuance under plan |  | 1,550,004 |  | — |  | 1,550,004
Total authorized by plan |  | 12,734,454 |  | — |  | 12,734,454
​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding or Exercised as of December 31, 2022 |  | 11,168,061 |  | — |  | 11,168,061
Available for future issuance under plan |  | 1,495,760 |  | — |  | 1,495,760
Totals authorized by plan |  | 12,663,821 |  | — |  | 12,663,821
​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding or Exercised as of December 31, 2023 |  | — |  | 8,791,833 |  | 8,791,833
Available for future issuance under plan |  | — |  | 3,849,804 |  | 3,849,804
Totals authorized by plan |  | — |  | 12,641,637 |  | 12,641,637
Schedule of summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average
​ | ​ | Number of | ​ | Average | ​ | Remaining Life
​ |  | Options |  | Exercise Price |  | (years)
Outstanding at December 31, 2020 |  | 2,633,175 | ​ | $ | 3.09 |  | 6.53
Granted |  | 1,100,500 | ​ |  | 17.23 |  |
Exercised |  | (739,956) | ​ |  | 3.36 |  |
Expired or Forfeited | ​ | (170,085) | ​ | ​ | 8.58 | ​ | ​
Outstanding at December 31, 2021 |  | 2,823,634 | ​ | $ | 7.67 |  | 7.95
Granted |  | 442,000 | ​ |  | 5.45 |  |
Exercised |  | (145,185) | ​ |  | 2.56 |  |
Expired or Forfeited |  | (314,776) | ​ |  | 9.27 |  |
Outstanding at December 31, 2022 |  | 2,805,673 | ​ | $ | 7.80 |  | 7.28
Granted |  | 180,000 | ​ |  | 4.43 |  |
Exercised |  | (28,240) | ​ |  | 1.33 |  |
Expired or Forfeited |  | (46,125) | ​ |  | 11.33 |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2023 |  | 2,911,308 | ​ | $ | 7.60 |  | 6.30
Summary of assumptions used to compute the fair value of stock options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2023 |  | 2022 |  | 2021 |
Assumptions for Black-Scholes: |  | ​ |  |  | ​ |  |  | ​ |  | ​
Expected term in years |  | ​ | 6.0 to 6.1 |  | ​ | 6.1 |  | ​ | 6.1 to 6.5 | ​
Volatility |  | ​ | 86.97% to 88.42 | % | ​ | 85.44% to 87.09 | % | ​ | 82.8% to 86.0 | %
Risk-free interest rate |  | ​ | 3.58% to 4.43 | % | ​ | 2.18% to 3.95 | % | ​ | 0.96% to 1.25 | %
Expected annual dividends |  | ​ | None |  | ​ | None |  | ​ | None | ​
Value of options granted: |  | ​ |  |  | ​ |  |  | ​ |  | ​
Number of options granted |  | ​ | 180,000 |  | ​ | 442,000 |  | ​ | 1,100,500 | ​
Weighted average fair value per share |  | $ | 3.34 |  | $ | 4.04 |  | $ | 12.40 | ​
Fair value of options granted |  | $ | 600,345 |  | $ | 1,783,710 |  | $ | 13,642,976 | ​

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