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Equity Incentive Plans (Tables) | 3 Months Ended
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Mar. 31, 2024
Equity Incentive Plan |
Summary of the Company's stock option activity | ​
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Weighted Average | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Grant Date | ​ | ​ | Weighted Average
​ |  | Shares |  | ​ | Fair Value |  | ​ | Exercise Price
Options outstanding as of December 31, 2023 |  | 2,574,299 | ​ | $ | 3.06 | ​ | $ | 4.52
Options granted |  | 1,097,500 |  | ​ | 2.74 | ​ | ​ | 4.31
Options exercised |  | (15,983) |  | ​ | 2.62 | ​ | ​ | 3.61
Options cancelled/forfeited |  | (125,000) |  | ​ | 3.47 | ​ | ​ | 4.77
Options outstanding as of March 31, 2024 |  | 3,530,816 |  | $ | 2.95 | ​ | $ | 4.45
Schedule of assumptions to determine grant-date fair value of stock options granted during the period | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​
​ | ​ | 2024 | ​ | 2023 | ​
Grant date fair value | $ | 2.74 | $ | 3.46 | ​
Volatility |  | 67 | % | 77 | %
Expected term (years) |  | 5.96 | ​ | 6.93 | ​
Risk-free interest rate |  | 4.27 | % | 3.38 | %
Expected dividend yield |  | — | ​ | — | ​
Schedule of stock-based compensation expense recognized for stock options granted to employees and non-employees | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31 | ​
​ |  | 2024 |  | 2023 |
Research and development |  | 182,237 |  | 166,869 |
General and administrative |  | 8,187 |  | 398,563 |
Total stock-based compensation | $ | 190,424 | $ | 565,432 | ​
Schedule of unvested restricted stock units | ​
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​ | ​ | ​ | ​ | ​ | ​ | Weighted Average
​ | ​ | ​ | ​ | ​ | ​ | Grant Date Fair
​ |  | ​ | Number of Shares | ​ | ​ | Value per Share
Outstanding as of December 31, 2023 | ​ | ​ | 493,799 | ​ | $ | 2.54
Granted | ​ | ​ | 25,000 | ​ | ​ | 4.37
Vested | ​ | ​ | (31,125) | ​ | ​ | 4.19
Cancelled/forfeited | ​ | ​ | (118,764) | ​ | ​ | 4.49
Outstanding as of March 31, 2024 | ​ | ​ | 368,910 | ​ | $ | 1.90
Total unrecognized expense remaining | ​ | $ | 689,297 | ​ | ​ | ​
Years expected to be recognized over | ​ | ​ | 3.00 | ​ | ​ | ​

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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