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Stock Options - Stock option activity (Details) - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Option Number of Shares    
Options outstanding as of beginning 4,851,666  
Granted 58,000  
Options outstanding as of end 4,909,666 4,851,666
Options exercisable as of end 1,906,098  
Weighted-Average Exercise Price Per Share    
Options outstanding as of beginning (in shares) $ 1.91  
Granted (in shares) 1.81  
Options outstanding as of end (in shares) 1.91 $ 1.91
Options exercisable as of end (in shares) $ 1.68  
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