Quarterly report pursuant to Section 13 or 15(d)

Offerings of Common Stock and Warrants - General Information (Details)

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Offerings of Common Stock and Warrants - General Information (Details)
 1 Months Ended
Oct. 01, 2020
USD ($)
$ / shares
shares
Jun. 16, 2020
USD ($)
$ / shares
Dec. 09, 2019
USD ($)
$ / shares
Oct. 24, 2019
$ / shares
shares
Sep. 04, 2019
$ / shares
shares
Feb. 04, 2019
USD ($)
$ / shares
shares
Jan. 31, 2021
item
$ / shares
shares
Jun. 30, 2022
USD ($)
shares
Goldman Warrant, Purchase Warrant for Common Shares                
Warrants                
Issued warrants (in shares)           1    
Exercise price (in dollars per share) | $ / shares   $ 2.61 $ 3.80     $ 8.86    
Aggregate shares called by warrants (in shares)           404,634   463,067
Aggregate shares called by each warrant (in shares)           404,634    
Purchase price of warrants | $           $ 150,000    
Date from which warrants exercisable           Aug. 04, 2019    
Maturity date           Feb. 04, 2024    
Expected proceeds from warrants | $   $ 1,186,313            
Amortization of debt discount (additional debt discount) | $   $ (100,000) $ (300,000)          
Value of warrants | $               $ 2,300,000
Goldman 2020 Warrant, Purchase Warrant for Common Shares                
Warrants                
Issued warrants (in shares) 1              
Exercise price (in dollars per share) | $ / shares $ 4.76              
Aggregate shares called by warrants (in shares) 291,295              
Aggregate shares called by each warrant (in shares) 291,295              
Date from which warrants exercisable Oct. 01, 2020              
Maturity date Feb. 04, 2024              
Private placement, purchase price | $ $ 10,000              
Value of warrants | $ $ 800,000              
September 2019 Pre-Funded Common Stock Warrants                
Warrants                
Exercise price (in dollars per share) | $ / shares       $ 0.001        
Aggregate shares called by warrants (in shares)         440,000      
Purchase price per warrant (in dollars per share) | $ / shares         $ 5.00      
Warrants exercised (in shares)       440,000        
September 2019 Series D Common Stock Warrants                
Warrants                
Outstanding warrants (in shares)               75,000
Exercise price (in dollars per share) | $ / shares         $ 6.12   $ 6.12  
Aggregate shares called by warrants (in shares)         765,000      
Term         5 years      
Date from which warrants exercisable         Apr. 02, 2020      
Maturity date         Apr. 02, 2025      
Shares as percentage of Registered Direct Offering (as a percent)         75.00%      
Number of warrant holders | item             3  
Warrants exercised (in shares)             690,000  
Warrants exercised, shares issued (in shares)             352,279