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Equity Incentive Plan (Tables) | 12 Months Ended
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Dec. 31, 2021
Summary of company's stock options activity and related information | A summary of the Company’s stock option activity and related information is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2021 | ​ | 2020
​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ |  | ​ | ​ |  | Weighted
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​ | Weighted | ​ | Average
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | ​ | ​ | Average | ​ | Remaining
​ | ​ | Stock | ​ | Exercise | ​ | Life | ​ | Stock | ​ | Exercise | ​ | Life
​ | ​ | Options | ​ | Price | ​ | (in years) | ​ | Options | ​ | Price | ​ | (in years)
Outstanding at January 1 |  | 391,650 | ​ | $ | 5.70 |  | 8.1 |  | 169,980 | ​ | $ | 8.13 |  | 9.1
Granted |  | 131,821 | ​ | $ | 11.42 |  |  |  | 226,691 | ​ | $ | 4.84 |  |
Exercised |  | (27,934) | ​ | $ | 3.27 |  |  |  | — | ​ |  |  |  |
Forfeited / Expired |  | (2,651) | ​ | $ | 8.04 |  |  |  | (5,021) | ​ | $ | 49.39 |  |
Outstanding at December 31 |  | 492,886 | ​ | $ | 7.35 |  | 7.6 |  | 391,650 | ​ | $ | 5.70 |  | 8.1
Exercisable at December 31 |  | 378,470 | ​ | $ | 6.17 |  | 7.1 |  | 364,567 | ​ | $ | 5.91 |  | 8.0
Schedule of additional information about stock options outstanding | The following table sets forth additional information about stock options outstanding at December 31, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | ​ | ​ |  | ​
​ | ​ | ​ | ​ | Average | ​ | Weighted | ​ | ​
​ | ​ | ​ | ​ | Remaining | ​ | Average | ​ | ​
​ | ​ | Options | ​ | Life | ​ | Exercise | ​ | Options
Range of Exercise Prices | ​ | Outstanding | ​ | (in years) | ​ | Price | ​ | Exercisable
$1.99 – $2.85 |  | 184,557 |  | 6.5 | ​ | $ | 2.51 |  | 170,641
$4.25 – $8.04 |  | 161,770 |  | 8.6 | ​ | $ | 7.09 |  | 161,270
$10.41 – $17.25 |  | 142,206 |  | 8.0 | ​ | $ | 12.67 |  | 42,206
$31.50 – $79.40 |  | 4,353 |  | 4.6 | ​ | $ | 48.50 |  | 4,353
​ |  | 492,886 |  |  | ​ |  |  |  | 378,470
Employee Stock Option [Member] |
Schedule of assumptions used in the black-scholes model | The assumptions used in the Black-Scholes model are as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended December 31, |
​ |  | 2021 |  | 2020 |
Average risk-free interest rate |  | 0.97 | % | 0.83 | %
Expected dividend yield |  | — | % | — | %
Expected life |  | 5.31 to 6.00 years |  | 5.00 to 6.25 years | ​
Expected volatility |  | 90 | % | 90 | %

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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 -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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