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Summary of Significant Accounting Policies - Loss per share, Warrants and Options expirations (Details) - $ / shares
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jan. 02, 2022
Dec. 15, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded 4,694,202 10,109,874    
Weighted average exercise price, outstanding warrants $ 2.41 $ 2.96    
Weighted average exercise price, outstanding options $ 2.30 $ 2.75    
Common Stock Warrants, Number Of Expirations     3,268,200 2,403,385
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded 59,872 5,731,464    
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded 2,195,306 1,939,386    
Convertible debt securities        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded 2,439,024 2,439,024