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Stock Options - Stock option activity (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Option Number of Shares |  |  |
Options outstanding as of beginning | 4,851,666 | 2,759,264 | 2,709,964
Granted | 58,000 | 2,149,152 | 335,300
Canceled |  | (56,750) | (286,000)
Options outstanding as of end | 4,909,666 | 4,851,666 | 2,759,264
Options exercisable as of end | 1,906,098 | 1,592,088 |
Option Exercise Price Per Share |  |  |
Options outstanding as of beginning (in shares), Minimum | $ 0.30 | $ 0.30 | $ 0.30
Options outstanding as of beginning (in shares), Maximum | 5.00 | 3.76 | 2.00
Granted (in shares), Minimum |  | 1.67 | 3.13
Granted (in shares), Maximum |  | 5.00 | 3.76
Cancelled (in shares), Minimum |  | 0.30 | 0.30
Cancelled (in shares), Maximum |  | 2.00 | 3.13
Options outstanding as of ending (in shares), Minimum |  | 0.30 | 0.30
Options outstanding as of ending (in shares), Maximum |  | 5.00 | 3.76
Exercisable (in shares), Minimum |  | 0.30 |
Exercisable (in shares), Maximum |  | 3.76 |
Weighted-Average Exercise Price Per Share |  |  |
Options outstanding as of beginning (in shares) | 1.91 | 1.66 | 1.48
Granted (in shares) | 1.81 | 2.19 | 3.17
Canceled (in shares) |  | 0.49 | 1.70
Options outstanding as of end (in shares) | 1.91 | 1.91 | $ 1.66
Options exercisable as of end (in shares) | $ 1.68 | $ 1.49 |
Weighted-Average Remaining Contractual Term |  |  |
Weighted-Average Remaining Contractual Term | 8 years 2 months 12 days | 8 years 4 months 24 days |
Weighted-Average Exercisable Remaining Contractual Term | 7 years 1 month 6 days |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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