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Equity Incentive Plans (Tables) | 6 Months Ended
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Jun. 30, 2024
Equity Incentive Plans |
Schedule of Stock Option Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Options Outstanding
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Remaining | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Contractual | ​ | Aggregate
​ | ​ | ​ | ​ | Exercise | ​ | Term | ​ | Intrinsic
​ |  | Shares |  | Price |  | (Years) |  | Value (in thousands)
Outstanding at December 31, 2023 |  | 3,165,216 | ​ | $ | 5.04 |  | 5.9 | ​ | $ | 429
Granted |  | 1,784,054 | ​ | $ | 3.38 |  | ​ |  | ​ | —
Exercised | ​ | (37,282) | ​ | $ | 3.38 | ​ | ​ | ​ | $ | 24
Forfeited/Cancelled/Expired |  | (266,251) | ​ | $ | 15.36 |  | ​ |  | ​ | —
Outstanding at June 30, 2024 |  | 4,645,737 | ​ | $ | 3.83 |  | 7.1 | ​ | $ | 144
Vested and expected to vest at June 30, 2024 |  | 4,645,737 | ​ | $ | 3.83 |  | 7.1 | ​ | $ | 144
Exercisable at June 30, 2024 |  | 2,627,743 | ​ | $ | 4.14 |  | 5.3 | ​ | $ | 144
Schedule of Restricted Stock Awards and Restricted Stock Unit Activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted Avg
​ | ​ | ​ | ​ | Grant Date
​ |  | Shares |  | Fair Value
Outstanding at December 31, 2023 | ​ | 200,000 | ​ | $ | 2.39
Granted | ​ | 90,000 | ​ | $ | 3.38
Outstanding at June 30, 2024 | ​ | 290,000 | ​ | $ | 2.70
Schedule of Assumptions Used in the Black-Scholes Model | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30,
​ |  | 2024 | ​ | 2023
Risk-free interest rate | ​ | 4.24% - 4.25% | ​ | 3.54% - 4.2%
Expected volatility | ​ | 89.4% - 92.5% | ​ | 90.99% - 91.58%
Expected term (in years) | ​ | 5.12 - 7.0 | ​ | 5.5 - 7.00
Expected dividend yield | ​ | 0% | ​ | 0%
Schedule of Stock-Based Compensation Expenses | The table below summarizes the total share-based compensation expense included in the Company’s condensed consolidated statements of operations for the periods presented (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023
Research and development | ​ | $ | 323 | ​ | $ | 259 | ​ | $ | 375 | ​ | $ | 804
General and administrative | ​ |  | 1,012 | ​ |  | 2 | ​ |  | 1,494 | ​ |  | 314
Total stock-based compensation expense | ​ | $ | 1,335 | ​ | $ | 261 | ​ | $ | 1,869 | ​ | $ | 1,118

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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -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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