Annual report pursuant to Section 13 and 15(d)

Warrants (Details)

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Warrants (Details) - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Number of Awards      
Non-vested Outstanding at beginning of year (in shares) 30,000    
Non-vested Outstanding at end of year (in shares) 229,373 30,000  
Common Stock Warrants      
Number of Awards      
Non-vested Outstanding at beginning of year (in shares) 1,597,606 168,932  
Issued (in shares) 11,605,596 2,159,395  
Exercised (in shares) (66,400) (719,609)  
Expired (in shares)   (11,112)  
Expired (in shares) (72,503)    
Non-vested Outstanding at end of year (in shares) 13,064,299 1,597,606 168,932
Weighted Average Exercise Price      
Outstanding at beginning of year (in usd per share) $ 21.22 $ 199.65  
Issued (in usd per share) 0.55 7.38  
Exercised (in usd per share) 5.97 5.06  
Expired (in usd per share) 108.80 900.00  
Outstanding at end of year (in usd per share) $ 2.40 $ 21.22 $ 199.65
Weighted Average Remaining Term in Years      
Outstanding 2 years 5 months 4 days 3 years 25 days 3 years 5 months 1 day
Issued 3 years 7 days 2 years 6 months 18 days