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Stock-Based Compensation and Warrants (Tables) | 12 Months Ended
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Dec. 31, 2021
Stock-Based Compensation and Warrants |
Schedule of assumptions used for awards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31, |
​ |  | 2021 |  | 2020 |
Exercise price | ​ | $ | 0.33 | ​ | $ | 0.42 | ​
Expected dividends | ​ |  | 0 | % | ​ | 0 | %
Expected volatility | ​ |  | 92 | % | ​ | 88 | %
Risk free interest rate | ​ |  | 1.12 | % | ​ | 0.31 | %
Expected life of option (years) | ​ |  | 4.3 | ​ | ​ | 4.3 | ​
Summary of stock option activity | A summary of stock option activity for the years ended December 31, 2021 and 2020 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | Weighted Average |  | Aggregate
​ | ​ | ​ | ​ | Average Exercise | ​ | Remaining | ​ | Intrinsic
​ | ​ | Options | ​ | Price | ​ | Contractual Life | ​ | Value
Balance - December 31, 2019 |  | 2,502,012 | ​ | $ | 3.62 |  | 6.51 years | ​ | $ | 153,353
​ |  |  | ​ |  |  |  |  | ​ |  |
Granted |  | 1,540,000 | ​ | ​ | 0.42 |  |  | ​ |  |
Exercised |  | — | ​ | ​ | — |  |  | ​ | ​ | ​
Expired |  | (14,944) | ​ | ​ | 17.57 |  |  | ​ |  |
Forfeited |  | (29,650) | ​ | ​ | 0.55 |  |  | ​ |  |
Balance - December 31, 2020 |  | 3,997,418 | ​ | ​ | 2.35 |  | 6.09 years | ​ | ​ | —
​ |  |  | ​ |  |  |  |  | ​ |  |
Granted |  | 2,260,000 | ​ | ​ | 0.33 |  |  | ​ |  |
Exercised |  | — | ​ | ​ | — |  |  | ​ | ​ | ​
Expired |  | (2,143) | ​ | ​ | 45.15 |  |  | ​ |  |
Forfeited |  | — | ​ | ​ | — |  |  | ​ |  |
​ |  |  | ​ |  |  |  |  | ​ |  |
Balance -December 31, 2021 - outstanding |  | 6,255,275 | ​ | $ | 1.61 |  | 5.58 years | ​ | $ | —
​ |  | ​ | ​ |  |  |  |  | ​ |  |
Balance - December 31, 2021 - exercisable |  | 2,786,934 | ​ | $ | 3.16 |  | 4.44 years | ​ | $ | —
​ |  |  | ​ |  |  |  |  | ​ |  |
Grant date fair value of options granted - December 31, 2021 |  |  | ​ | $ | 501,000 |  |  | ​ |  |
​ |  |  | ​ |  |  |  |  | ​ |  |
Weighted average grant date fair value - December 31, 2021 |  |  | ​ | $ | 0.22 |  |  | ​ |  |
​ |  |  | ​ |  | ​ |  |  | ​ |  |
Grant date fair value of options granted - December 31, 2020 |  |  | ​ | $ | 412,000 |  |  | ​ |  |
​ |  |  | ​ |  |  |  |  | ​ |  |
Weighted average grant date fair value - December 31, 2020 |  |  | ​ | $ | 0.27 |  |  | ​ |  |
Schedule of options outstanding and exercisable | The options outstanding and exercisable at December 31, 2021 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options Outstanding | ​ | Options Exercisable
​ | ​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ |  | ​ | ​ |  | Weighted
​ | ​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​ | Weighted | ​ | Average
​ | ​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | ​ | ​ | Average | ​ | Remaining
Range of | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | ​ | ​ | Exercise | ​ | Contractual
Exercise Price | ​ | Options | ​ | Price | ​ | Life | ​ | Options | ​ | Price | ​ | Life
$ | 0.00 – $40.00 |  | 6,189,257 | ​ | $ | 0.75 |  | 6 years |  | 2,720,916 | ​ | $ | 1.25 |  | 4 years
​ | 41.00 – $70.00 |  | 6,221 | ​ |  | 52.07 |  | 2 years |  | 6,221 | ​ |  | 52.07 |  | 2 years
​ | 71.00 – $102.00 |  | 59,797 | ​ | ​ | 85.19 |  | 2 years |  | 59,797 | ​ | ​ | 85.19 |  | 2 years
Summary of all warrant activity | A summary of all warrant activity for the Company for the years ended December 31, 2021 and 2020 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of |  | Weighted Average
​ | ​ | Warrants | ​ | Exercise Price
Balance at December 31,2019 |  | 18,714,999 | ​ | $ | 3.24
Granted |  | — | ​ |  | —
Exercised |  | — | ​ |  | —
Forfeited |  | (714,286) | ​ |  | 50.05
Balance at December 31,2020 |  | 18,000,713 | ​ |  | 0.69
Granted |  | — | ​ |  | —
Exercised |  | (11,655,747) | ​ |  | —
Forfeited |  | — | ​ |  | 0.69
Balance at December 31,2021 |  | 6,344,966 | ​ | $ | 0.69
Summary of all outstanding and exercisable warrants | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | ​ |  | ​ |  | Weighted Average
​ | ​ | ​ | Warrants | ​ | Warrants | ​ | Remaining
Exercise Price | ​ | Outstanding | ​ | Exercisable | ​ | Contractual Life
$ | 0.69 |  | 6,344,252 |  | 6,344,252 |  | 0.99 years
​ | 18.20 |  | 714 |  | 714 |  | 1.78 years
$ | 0.69 |  | 6,344,966 |  | 6,344,966 |  | 1.78 years

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