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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  
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