Quarterly report pursuant to Section 13 or 15(d)

Private Equity Offerings - Additional Information (Detail)

v3.19.1
Private Equity Offerings - Additional Information (Detail) - USD ($)
 1 Months Ended 9 Months Ended
Jun. 15, 2018
Feb. 13, 2019
Feb. 28, 2019
May 31, 2018
Equity and Equity Units Offering Disclosure [Line Items]        
Exercise price of warrants, per share       $ 1.00
Common stock, par value     $ 0.001  
Placement Agent        
Equity and Equity Units Offering Disclosure [Line Items]        
Exercise price of warrants, per share $ 0.55 $ 0.50 0.50  
Warrants to purchase common shares, shares 133,600 965,563    
Percentage of shares, issued as warrants 8.00% 9.00%    
Term of warrants 5 years      
Private Equity Offering        
Equity and Equity Units Offering Disclosure [Line Items]        
Exercise price of warrants, per share     $ 0.75  
Warrant covering common stock shares purchased, percentage     50.00%  
Common stock sold at private equity offering     46,975,170  
Common stock, par value     $ 0.001  
Warrants to purchase common shares, shares     23,487,585  
Proceeds from issuance of common shares     $ 23,500,000  
Term of warrants     5 years  
Private Equity Offering | Placement Agent        
Equity and Equity Units Offering Disclosure [Line Items]        
Exercise price of warrants, per share     $ 0.50  
Warrants to purchase common shares, shares     4,446,917  
Percentage of shares, issued as warrants     10.00%  
Term of warrants     5 years  
Payment of one time non-accountable fees     $ 25,000  
Private Equity Offering | Warrants        
Equity and Equity Units Offering Disclosure [Line Items]        
Exercise price of warrants, per share     $ 0.75  
Warrants to purchase common shares, shares     23,487,585