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Equity-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2023
Equity-based Compensation |
Schedule of fair value of options granted using the Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30, | ​
​ |  | 2023 |  | 2022 |
Fair value of common stock | ​ | $1.65 – $2.99 |  | $1.92 – $3.05 | ​
Expected volatility |  | 91.53% – 92.68% |  | 91.09% – 92.72% | ​
Risk-free interest rate |  | 3.46% – 4.21% |  | 1.87% –  3.25% | ​
Dividend yield |  | 0.00% |  | 0.00% | ​
Expected term (years) |  | 6.18 – 6.36 |  | 5.50 – 6.08 | ​
Summary of activity for options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Options Outstanding
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Weighted- | ​ | Aggregate | ​ | Average
​ | ​ | ​ | ​ | Average | ​ | Intrinsic | ​ | Remaining
​ | ​ | Number of | ​ | Exercise | ​ | Value | ​ | Contractual Life
​ |  | Options |  | Price |  | (in 000’s) |  | (In Years)
Balance, December 31, 2022 |  | 3,679,468 | ​ | $ | 5.13 |  | $ | 2,085 |  | 6.7
Options granted |  | 576,269 | ​ | $ | 2.06 |  | ​ | ​ |  | ​
Options exercised |  | — | ​ | $ | — |  | ​ | ​ |  | ​
Options forfeited |  | (79,742) | ​ | $ | 1.95 |  | ​ | ​ |  | ​
Options expired |  | (6,818) | ​ | $ | 1.54 |  | ​ | ​ |  | ​
Balance, June 30, 2023 |  | 4,169,177 | ​ | $ | 4.77 | ​ | $ | 1,513 |  | 7.0
Exercisable as of June 30, 2023 |  | 2,669,797 | ​ | $ | 4.80 | ​ | $ | 1,309 | ​ | 6.0
Schedule of restricted stock units award activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of |  | ​ | Weighted-Average
​ | ​ | Restricted | ​ | ​ | Grant Date
​ | ​ | Stock Units | ​ | ​ | Fair Value
Outstanding at December 31, 2022 | ​ | — | ​ | $ | —
Granted | ​ | 539,419 | ​ | $ | 2.07
Vested | ​ | — | ​ | $ | —
Forfeited | ​ | (19,825) | ​ | $ | —
Outstanding at June 30, 2023 | ​ | 519,594 | ​ | $ | 2.07
Schedule of total equity-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ |  | Six Months Ended June 30,
​ |  | 2023 |  | 2022 |  |  | 2023 |  | 2022
Research and development | ​ | $ | 156 | ​ | $ | 82 | ​ | ​ | $ | 313 | ​ | $ | 316
General and administrative | ​ |  | 869 | ​ |  | 810 | ​ | ​ |  | 1,899 | ​ |  | 1,577
Total equity-based compensation | ​ | $ | 1,025 | ​ | $ | 892 | ​ | ​ | $ | 2,212 | ​ | $ | 1,893

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