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Stock Options (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Stock Options |  |
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Option |  | Weighted-Average |  | Weighted-Average
​ | ​ | Number of | ​ | Exercise | ​ | Remaining
​ |  | Shares |  | Price Per Share |  | Contractual Term
Options outstanding as of January 1, 2023 |  | 4,851,666 | ​ | $ | 1.91 |  | 8.4
Granted |  | 58,000 | ​ |  | 1.81 |  |
Exercised |  | — | ​ |  | — |  |
Canceled |  | — | ​ |  | — |  |
Options outstanding as of March 31, 2023 |  | 4,909,666 | ​ | $ | 1.91 |  | 8.2
Options exercisable as of March 31, 2023 |  | 1,906,098 | ​ | $ | 1.68 |  | 7.1
| ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Option |  | Option |  | Weighted-Average
​ | ​ | Number of | ​ | Exercise | ​ | Exercise
​ |  | Shares |  | Price Per Share |  | Price Per Share
Options outstanding at January 1, 2021 |  | 2,709,964 | ​ | $0.30 - $2.00 |  | $ | 1.48
Granted |  | 335,300 | ​ | $3.13 - $3.76 |  | $ | 3.17
Exercised |  | — | ​ | — |  |  | —
Canceled |  | (286,000) | ​ | $0.30 - $3.13 |  | $ | 1.70
Options outstanding at December 31, 2021 |  | 2,759,264 | ​ | $0.30 - $3.76 |  | $ | 1.66
Granted | ​ | 2,149,152 | ​ | $1.67 - $5.00 | ​ | $ | 2.19
Exercised | ​ | — | ​ | — | ​ | ​ | —
Canceled | ​ | (56,750) | ​ | $0.30 - $2.00 | ​ | $ | 0.49
Options outstanding at December 31, 2022 | ​ | 4,851,666 | ​ | $0.30 - $5.00 | ​ | $ | 1.91
Options exercisable at December 31, 2022 |  | 1,592,088 | ​ | $0.30 - $3.76 |  | $ | 1.49
Schedule of grant date fair value black scholes valuation assumptions |  | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31, |
​ | ​ | 2022 | ​ | 2021 |
Expected term |  | 7.21 | years | 7.0 | years
Volatility |  | 27.03 | % | 30.3 | %
Dividend rate |  | 0.0 | % | 0.0 | %
Discount rate |  | 3.32 | % | 1.2 | %

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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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