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Equity Incentive Plan (Tables) | 12 Months Ended
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Dec. 31, 2022
Summary of company's stock options activity and related information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2021
​ |  | ​ |  | ​ | ​ |  | 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 |  | 492,886 | ​ | $ | 7.35 |  | 7.6 |  | 391,650 | ​ | $ | 5.70 |  | 8.1
Granted |  | 61,062 | ​ | $ | 11.09 |  | ​ |  | 131,821 | ​ | $ | 11.42 |  | ​
Exercised |  | (3,750) | ​ | $ | 5.36 |  | ​ |  | (27,934) | ​ | $ | 3.27 |  | ​
Forfeited / Expired |  | (36,250) | ​ | $ | 10.45 |  | ​ |  | (2,651) | ​ | $ | 8.04 |  | ​
Outstanding at December 31 |  | 513,948 | ​ | $ | 7.59 |  | 6.6 |  | 492,886 | ​ | $ | 7.35 |  | 7.6
Exercisable at December 31 |  | 443,284 | ​ | $ | 6.78 |  | 6.2 |  | 378,470 | ​ | $ | 6.17 |  | 7.1
​
Schedule of additional information about stock options outstanding | The following table sets forth additional information about stock options outstanding at December 31, 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | ​ | ​ |  | ​
​ | ​ | ​ | ​ | Average | ​ | Weighted | ​ | ​
​ | ​ | ​ | ​ | Remaining | ​ | Average | ​ | ​
​ | ​ | Options | ​ | Life | ​ | Exercise | ​ | Options
Range of Exercise Prices | ​ | Outstanding | ​ | (in years) | ​ | Price | ​ | Exercisable
$1.99 – $2.85 |  | 181,557 |  | 5.3 | ​ | $ | 2.52 |  | 181,557
$4.25 – $9.31 |  | 176,736 |  | 7.5 | ​ | $ | 7.33 |  | 176,736
$10.41 – $17.25 |  | 151,302 |  | 7.2 | ​ | $ | 12.82 |  | 80,638
$31.50 – $79.40 |  | 4,353 |  | 3.6 | ​ | $ | 48.50 |  | 4,353
​ |  | 513,948 |  |  | ​ |  |  |  | 443,284
​
Schedule of restricted stock unit (RSU) and performance stock unit (PSU) activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2021
​ |  | RSUs |  | ​ | PSUs |  | RSUs |  | PSUs
Outstanding at January 1 |  | 100,000 |  | ​ | — |  | — |  | ​ | —
Granted |  | 117,000 |  | ​ | 114,000 |  | 100,000 |  | ​ | —
Vested |  | (33,334) |  | ​ | — |  | — |  | ​ | —
Outstanding at December 31 |  | 183,666 |  | ​ | 114,000 |  | 100,000 | ​ | $ | —
​
Employee Stock Option |
Schedule of assumptions used in the black-scholes model | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended December 31, |
​ |  | 2022 |  | 2021 |
Average risk-free interest rate |  | 2.67 | % | 0.97 | %
Expected dividend yield |  | — | % | — | %
Expected life |  | 5.25 to 6.00 years |  | 5.31 to 6.00 years | ​
Expected volatility |  | 90 | % | 90 | %
​

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- Definition Tabular disclosure of activity for outstanding award under share-based payment arrangement excluding share and unit options and nonvested award. + 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 (c)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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