Registration statement for securities of certain foreign private issuers

Subsequent events - Disclosure Of Shares Sold Pursuant To Share Purchase Agreement (Details)

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Subsequent events - Disclosure Of Shares Sold Pursuant To Share Purchase Agreement (Details) - Aspire Agreement [Member] - Aspire Capital Fund LLC [Member] - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 13, 2020
Feb. 06, 2020
Jan. 10, 2020
Jan. 08, 2020
Jan. 06, 2020
Jan. 03, 2020
Jan. 23, 2020
Jan. 18, 2020
Jan. 17, 2020
Dec. 23, 2019
Mar. 31, 2020
Dec. 31, 2019
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                        
Issue of equity                   $ 423,440 $ 5,304,531 $ 5,304,531
Events After Reporting Period [Member]                        
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                        
Common stock shares issued               4,408,048        
Issue of equity               $ 2,071,930        
Events After Reporting Period [Member] | Grant Date February Thirteen Two Thousand Twenty [Member]                        
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                        
Common stock shares issued 708,048                      
Issue of equity $ 300,000                      
Events After Reporting Period [Member] | Grant Date February Six Two Thousand Twenty [Member]                        
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                        
Common stock shares issued   600,000                    
Issue of equity   $ 282,000                    
Events After Reporting Period [Member] | Grant Date January Twenty Three Two Thousand Twenty [Member]                        
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                        
Common stock shares issued             600,000          
Issue of equity             $ 295,320          
Events After Reporting Period [Member] | Grant Date Seventeen Two Thousand Twenty [Member]                        
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                        
Common stock shares issued                 600,000      
Issue of equity                 $ 303,000      
Events After Reporting Period [Member] | Grant Date January Ten Two Thousand Twenty [Member]                        
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                        
Common stock shares issued     500,000                  
Issue of equity     $ 247,550                  
Events After Reporting Period [Member] | Grant Date January Eight Two Thousand Twenty [Member]                        
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                        
Common stock shares issued       400,000                
Issue of equity       $ 195,160                
Events After Reporting Period [Member] | Grant Date January Six Two Thousand Twenty [Member]                        
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                        
Common stock shares issued         500,000              
Issue of equity         $ 229,300              
Events After Reporting Period [Member] | Grant Date January Three Two Thousand Twenty [Member]                        
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                        
Common stock shares issued           500,000            
Issue of equity           $ 219,600