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v3.25.2

Stock Option Plans and Warrants to Purchase Common Stock (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Grant 2015 Plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of shares available for grant under the 2015 plan | ​
​ | ​ | ​
Shares available for grant at January 1, 2024 |  | 5,943,590
Options granted |  | (173,740)
Options forfeited |  | 272
Options exercised | ​ | —
Shares available for grant at December 31, 2024 |  | 5,770,122
Stock options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of activity under the 2005 plan and the 2015 plan | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Exercise
​ |  | Options |  | Price
Balance outstanding at December 31, 2022 |  | 11,946 | ​ | $ | 435.32
Granted |  | 45,715 | ​ |  | 10.45
Forfeited |  | (1,052) | ​ |  | 533.80
Cancelled | ​ | — | ​ | ​ | —
Exercised | ​ | — | ​ | ​ | —
Balance outstanding at December 31, 2023 |  | 56,609 | ​ | $ | 90.58
Granted |  | 173,740 | ​ |  | 3.35
Forfeited |  | (430) | ​ |  | 1,549.28
Cancelled | ​ | — | ​ | ​ | —
Exercised |  | — | ​ |  | —
Balance outstanding at December 31, 2024 |  | 229,919 | ​ | $ | 21.94
Schedule of weighted-average exercise price, by price range, for outstanding options to purchase common stock | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Weighted | ​ | ​ | ​ | ​
​ | ​ | Average | ​ | ​ | ​ | ​
​ | ​ | Remaining | ​ | ​ | ​ | ​
​ | ​ | Contractual | ​ | Outstanding | ​ | Exercisable
Price Range |  | Life in Years |  | Options |  | Options
$3.31 – $10.78 |  | 9.74 |  | 218,268 |  | 61,868
$129.60 – $640.80 |  | 5.83 |  | 11,382 |  | 10,848
$1,776.00 – $3,624.00 | ​ | 1.05 | ​ | 269 | ​ | 269
Total |  | 9.54 |  | 229,919 |  | 72,985
Share-based Payment Arrangement |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of share-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Share-based compensation |  | 2024 |  | 2023
Research and development | ​ | $ | 131,917 | ​ | $ | 150,466
General and administrative | ​ |  | 197,898 | ​ |  | 219,716
Total | ​ | $ | 329,815 | ​ | $ | 370,182
Warrants |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of warrant activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | ​ | Exercise
​ |  | Warrants |  | Price
Balance at December 31, 2022 |  | ​ | 42 | ​ | $ | 468.00
Granted |  | ​ | 673,455 | ​ |  | 14.56
Exercised |  | ​ | (264,815) | ​ |  | 0.002
Expired |  | ​ | (42) | ​ |  | 468.00
Balance at December 31, 2023 |  | ​ | 408,640 | ​ | $ | 24.00
Granted(1) |  | ​ | 2,334,382 | ​ |  | 2.73
Exercised |  | ​ | (1,275,441) | ​ |  | 3.71
Expired |  | ​ | — | ​ |  | —
Balance at December 31, 2024 | ​ | ​ | 1,467,581 | ​ | $ | 11.01
(1) | Excludes pre-funded warrants issued in connection with public offerings.
​
Schedule of remaining life, by grant date, for outstanding warrants | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Remaining | ​ | ​ | ​ | ​
​ | ​ | Exercise | ​ | Contractual | ​ | Outstanding | ​ | Exercisable
Grant Date |  | Price |  | Life in Years |  | Warrants |  | Warrants
May 09, 2023 | ​ | $ | 24.00 |  | 3.36 |  | 408,640 |  | 408,640
April 22, 2024 | ​ | ​ | 6.40 | ​ | 4.31 | ​ | 4,253 | ​ | 4,253
July 10, 2024 | ​ | ​ | 6.00 | ​ | 4.53 | ​ | 1,054,688 | ​ | 1,054,688
Total | ​ | ​ | ​ | ​ | ​ |  | 1,467,581 |  | 1,467,581
​

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