Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Events After Reporting Date - Disclosure Of Shares Sold Pursuant To Share Purchase Agreement (Detail)

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Events After Reporting Date - Disclosure Of Shares Sold Pursuant To Share Purchase Agreement (Detail) - USD ($)
 12 Months Ended
Feb. 13, 2020
Feb. 06, 2020
Jan. 23, 2020
Jan. 18, 2020
Jan. 17, 2020
Jan. 10, 2020
Jan. 08, 2020
Jan. 06, 2020
Jan. 03, 2020
Dec. 23, 2019
Dec. 31, 2019
Aug. 29, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued                         21,675,849 12,686,723
Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued       4,408,048           973,000 7,784,444 1,777,325    
Issue of equity       $ 2,071,930           $ 423,440 $ 5,304,531      
January 3, 2020 [Member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued                 500,000          
Issue of equity                 $ 219,600          
January 6, 2020 [Member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued               500,000            
Issue of equity               $ 229,300            
January 8, 2020 [Member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued             400,000              
Issue of equity             $ 195,160              
January 10, 2020 [Member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued           500,000                
Issue of equity           $ 247,550                
January 17, 2020 [Member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued         600,000                  
Issue of equity         $ 303,000                  
January 23, 2020 [Member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued     600,000                      
Issue of equity     $ 295,320                      
February 6, 2020 [Member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued   600,000                        
Issue of equity   $ 282,000                        
February 13, 2020 [Member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued 708,048                          
Issue of equity $ 300,000                          
August 30, 2019 [member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued                     2,417,162      
Issue of equity                     $ 3,000,000      
November 8, 2019, One [member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued                     100,000      
Issue of equity                     $ 42,560      
November 8, 2019, Two [member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued                     100,000      
Issue of equity                     $ 42,560      
November 12, 2019, One [member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued                     100,000      
Issue of equity                     $ 42,970      
November 12, 2019,Two [member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued                     100,000      
Issue of equity                     $ 42,000      
November 13, 2019 [member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued                     100,000      
Issue of equity                     $ 42,970      
November 14, 2019 [member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued                     300,000      
Issue of equity                     $ 128,910      
November 15, 2019 [member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued                     2,500,000      
Issue of equity                     $ 1,074,250      
November 19, 2019 [member] | Events After Reporting Period [member] | Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure Of Shares Sold Pursuant To Share Purchase Agreement [Line Items]                            
Common stock shares issued                     2,067,282      
Issue of equity                     $ 888,311