Registration statement for securities of certain foreign private issuers

Subsequent events - Additional Information (Detail)

v3.20.1
Subsequent events - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
May 06, 2020
USD ($)
$ / shares
shares
May 06, 2020
CAD ($)
shares
May 06, 2020
CAD ($)
Jan. 03, 2020
USD ($)
$ / shares
shares
Apr. 28, 2020
USD ($)
Mar. 25, 2020
USD ($)
$ / shares
shares
Mar. 25, 2020
CAD ($)
shares
Jan. 28, 2020
shares
$ / shares
Aug. 29, 2019
USD ($)
shares
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 23, 2019
USD ($)
shares
Disclosure of non-adjusting events after reporting period [line items]                            
Shares issued | shares | shares                   54,216,877   39,907,681    
Common stock value outstanding                   $ 198,693,476   $ 194,859,415 $ 170,502,394  
Weighted average remaining contractual life of outstanding share options                       5 years 3 months 25 days    
Amount allocated to common shares                   $ 1,011,120 $ 7,002,043 $ 7,002,043 $ 59,998  
Warrant exercised | shares                   2,400,000   1,018,506 6,500  
Proceeds from warrant exercised                   $ 38,000        
Over Allotment Option 1 [Member]                            
Disclosure of non-adjusting events after reporting period [line items]                            
Warrant exercised | shares                     1,018,506      
Proceeds from warrant exercised                     $ 3,259,219      
Aspire Agreement [Member]                            
Disclosure of non-adjusting events after reporting period [line items]                            
Gross proceeds from offerings                   $ 3,000,000   $ 3,000,000    
Events After Reporting Period [Member]                            
Disclosure of non-adjusting events after reporting period [line items]                            
Number of share options granted in share-based payment arrangement | shares               25,765            
Weighted average remaining contractual life of outstanding share options               7 years            
Weighted average exercise price of share options granted in share-based payment arrangement | $ / shares               $ 0.657            
Warrant exercised | shares                   200,000        
Proceeds from warrant exercised                   $ 38,000        
Events After Reporting Period [Member] | Senior secured promissory note [Member]                            
Disclosure of non-adjusting events after reporting period [line items]                            
Borrowings         $ 1,500,000                  
Borrowings interest rate         8.00%                  
Maturity date         April 28, 2023                  
Wainwright [Member] | Events After Reporting Period [Member]                            
Disclosure of non-adjusting events after reporting period [line items]                            
Gross proceeds from offerings $ 2,000,000                          
Price per share | $ / shares $ 0.36268                          
Number of warrants to purchase common stock | shares 2,757,252 2,757,252       490,000 490,000              
Exercise price per share | $ / shares $ 0.3002         $ 0.2125                
Warrants expiration period 5 years 6 months 5 years 6 months                        
Cash commissions             $ 83,300              
Warrants expiration period           Mar. 25, 2025 Mar. 25, 2025              
Sale of offering units | shares 5,514,504 5,514,504                        
Wainwright [Member] | Events After Reporting Period [Member] | Over Allotment Option 1 [Member]                            
Disclosure of non-adjusting events after reporting period [line items]                            
Number of warrants to purchase common stock | shares 386,015 386,015                        
Cash commissions   $ 140,000                        
Warrants expiration period Nov. 06, 2025 Nov. 06, 2025                        
Common stock price per share | $ / shares $ 0.45335                          
Institutional Investors [Member] | Events After Reporting Period [Member]                            
Disclosure of non-adjusting events after reporting period [line items]                            
Shares issued | shares | shares           7,000,000                
Gross proceeds from offerings           $ 1,200,000                
Share price | $ / shares           $ 0.17                
Number of warrants to purchase common stock | shares           3,500,000 3,500,000              
Net proceeds from offering     $ 1,613,800     $ 885,000                
Exercise price per share | $ / shares           $ 0.19                
Warrants expiration period           5 years 5 years              
Fair value of warrants           $ 618,100                
Amount allocated to common shares           $ 571,900                
Cambridge Design Partnership Limited [Member] | Events After Reporting Period [Member]                            
Disclosure of non-adjusting events after reporting period [line items]                            
Common stock shares issued for consideration other than cash | shares       501,148                    
Price per share | $ / shares       $ 0.50                    
Common stock value outstanding       $ 250,574                    
Aspire Capital Fund LLC [Member] | Aspire Agreement [Member]                            
Disclosure of non-adjusting events after reporting period [line items]                            
Capital Issued Commitments                 $ 35,000,000         $ 35,000,000
Shares issued | shares | shares                 1,777,325 7,784,444   7,784,444   973,000
Gross proceeds from offerings                 $ 3,000,000