Quarterly report pursuant to Section 13 or 15(d)

Warrants - Summary of warrant activity (Details)

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Warrants - Summary of warrant activity (Details) - Common Stock Warrants - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Number of Common Shares Issuable Upon Exercise of Outstanding Warrants        
Outstanding at beginning of year (in shares) 1,597,606 168,932 168,932  
Issued (in shares) 11,605,596      
Exercised (in shares) (50,000)      
Expired (in shares) (39,719) (11,112)    
Outstanding at end of year (in shares) 13,113,483 157,820 1,597,606 168,932
Weighted Average Exercise Price        
Outstanding at beginning of year (in usd per share) $ 21.22 $ 199.65 $ 199.65  
Issued (in usd per share) 1.12      
Exercised (in usd per share) 5.97      
Expired (in usd per share) 192.00 900.00    
Outstanding at end of year (in usd per share) $ 2.97 $ 150.40 $ 21.22 $ 199.65
Weighted Average Remaining Term in Years        
Outstanding 2 years 11 months 12 days 3 years 1 month 20 days 3 years 25 days 3 years 5 months 1 day
Issued 2 years 7 months 9 days