Quarterly report pursuant to Section 13 or 15(d)

Stock Options - Option Activity (Details)

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Stock Options - Option Activity (Details) - Share-based Payment Arrangement, Option - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Stock Options      
Beginning balance (in shares) 1,183,908    
Granted (in shares) 0 0  
Exercised (in shares) 0    
Forfeited/Cancelled (in shares) (117,969)    
Expired (in shares) (5,800)    
Ending balance (in shares) 1,060,139   1,183,908
Unvested (in shares) 90,348    
Vested and exercisable (in shares) 969,791    
Weighted- Average Grant Date Fair Value per Share      
Outstanding, term 5 years 5 months 19 days   5 years 6 months 21 days
Unvested, term 4 years 11 months 4 days    
Vested and exercisable, term 5 years 6 months 7 days    
Weighted-Average Exercise Price per Share      
Beginning balance (in dollars per share) $ 14.96    
Granted (in dollars per share) 0    
Exercised (in dollars per share) 0    
Forfeited/Cancelled (in dollars per share) 11.81    
Expired (in dollars per share) 19.90    
Ending balance (in dollars per share) 15.28   $ 14.96
Unvested options (in dollars per share) 7.04    
Vested and exercisable (in dollars per share) $ 16.05