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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Stock-Based Compensation |
Schedule of share-based compensation expense | Stock-based compensation expense was included in general and administrative as follows in the accompanying statements of comprehensive loss:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year Ended | ​
​ | December 31, | ​
​ | ​ | 2022 | ​ |  | 2021 | ​
General and administrative | $ | 854 | ​ | $ | 662 | ​
​
Schedule of stock option plan activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted‑ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | Aggregate | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Intrinsic | ​
​ | ​ | Number of | ​ | Exercise | ​ | Contractual | ​ | Value | ​
​ | ​ | Options | ​ | Price | ​ | Term (years) | ​ | (in thousands) | ​
Outstanding at January 1, 2021 | ​ | 30,676 | ​ | $ | 108.32 | ​ | 8.5 | ​ | $ | — | ​
Granted | ​ | 22,555 | ​ | $ | 67.80 | ​ | — | ​ | $ | — | ​
Exercised | ​ | (6,096) | ​ | $ | 17.90 | ​ | — | ​ | $ | 364 | ​
Forfeited/Cancelled | ​ | (14,637) | ​ | $ | 57.89 | ​ | — | ​ | $ | — | ​
Outstanding at December 31, 2021 | ​ | 32,498 | ​ | $ | 119.72 | ​ | 9.3 | ​ | $ | — | ​
Granted | ​ | 5,995 | ​ | $ | 17.83 | ​ | — | ​ | $ | — | ​
Exercised | ​ | - | ​ | $ | — | ​ | — | ​ | $ | — | ​
Forfeited/Cancelled | ​ | (2,000) | ​ | $ | 181.20 | ​ | — | ​ | $ | — | ​
Outstanding at December 31, 2022 | ​ | 36,493 | ​ | $ | 99.62 | ​ | 8.5 | ​ | $ | - | ​
Vested and expected to vest at December 31, 2022 | ​ | 36,493 | ​ | $ | 99.62 | ​ | 8.5 | ​ | $ | - | ​
Options exercisable at December 31, 2022 | ​ | 17,903 | ​ | $ | 146.70 | ​ | 8.1 | ​ | $ | - | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
Schedule of unvested stock options | The following table summarizes the Company’s unvested stock options as of and for the year ended December 31, 2022:
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant Date
​ | ​ | Options | ​ | Fair Value
Nonvested at January 1, 2022 | ​ | 25,725 | ​ | $ | 59.09
Granted | ​ | 5,995 | ​ | $ | 12.43
Vested | ​ | (12,018) | ​ | $ | 64.90
Forfeited/Cancelled | ​ | (1,112) | ​ | $ | 117.26
Nonvested as of December 31, 2022 | ​ | 18,590 | ​ | $ | 36.81
​
Schedule of assumptions used in the Black Scholes option-pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended
​ | ​ | ​ | December 31,
​ |  | ​ | 2022 | ​ | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expected stock price volatility | ​ | ​ | ​ | 80.7-85.2 | % | ​ | ​ | 79.0-80.4 | %
Expected life of options (years) | ​ | ​ | ​ | 5.5-5.8 | ​ | ​ | ​ | 5.8 | ​
Expected dividend yield | ​ | ​ | ​ | — | % | ​ | ​ | — | %
Risk free interest rate | ​ | ​ | ​ | 1.72-3.08 | % | ​ | ​ | 0.93-1.33 | %
​

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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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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