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Equity-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity-based Compensation |
Schedule of total equity-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Research and development | ​ | $ | (4) | ​ | $ | 56 | ​ | $ | 30 | ​ | $ | 161
General and administrative | ​ |  | 76 | ​ |  | 73 | ​ |  | 234 | ​ |  | 181
Total equity-based compensation | ​ | $ | 72 | ​ | $ | 129 | ​ | $ | 264 | ​ | $ | 342
Schedule of fair value of options granted using the Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 30,
​ |  | 2021 |  | 2020
Fair value of common stock | ​ | $1.75 - $6.15 |  | $1.20
Expected volatility | ​ | 100.82% - 101.83% |  | 104.60% - 109.34%
Risk-free interest rate | ​ | 0.67% - 1.06% |  | 0.38% - 1.60%
Dividend yield | ​ | 0.00% |  | 0.00%
Expected term (years) | ​ | 5.00 - 6.22 |  | 5.00 - 6.25
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, 2020 |  | 4,587,865 | ​ | $ | 0.98 |  | ​ |  |  |
Options granted |  | 67,232 | ​ | $ | 2.25 |  | ​ |  |  |
Options exercised |  | (25,783) | ​ | $ | 0.73 |  | ​ |  |  |
Options forfeited |  | (161,479) | ​ | $ | 1.12 |  | ​ |  |  |
Options expired |  | (148,843) | ​ | $ | 0.94 |  | ​ |  |  |
Balance, September 30, 2021 |  | 4,318,992 | ​ | $ | 1.00 | ​ | $ | 22,213 |  | 6.4
Exercisable as of September 30, 2021 |  | 3,023,934 | ​ | $ | 0.92 | ​ | $ | 15,800 |  | 5.6
Vested and expected to vest as of September 30, 2021 |  | 3,982,080 | ​ | $ | 1.00 | ​ | $ | 20,494 |  | 6.3

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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