Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v3.19.1
Subsequent Events - Additional Information (Detail) - USD ($)
1 Months Ended
Apr. 05, 2019
Apr. 02, 2019
Mar. 20, 2019
Mar. 14, 2019
Mar. 12, 2019
Mar. 29, 2019
Feb. 28, 2019
Nov. 30, 2018
Aug. 31, 2018
May 31, 2018
Subsequent Event [Line Items]                    
Exercise price of warrants, per share                   $ 1.00
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years         5 years        
Common Stock, Shares, Issued             304,679,081     216,881,790
Shares Issued, Price Per Share             $ 0.50 $ 0.50 $ 0.50  
Common Stock                    
Subsequent Event [Line Items]                    
Shares Issued, Price Per Share               $ 0.50 $ 0.50  
Subsequent Event                    
Subsequent Event [Line Items]                    
Exercise price of warrants, per share $ 0.50   $ 0.50              
Warrants to purchase common shares, shares 785,700   3,895,200              
preferred stock, par or stated value     $ 0.001              
Proceeds from Issuance or Sale of Equity $ 4,000,000   $ 3,200,000              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           40,000        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price           $ 0.48        
Common Stock, Shares, Issued 8,730,000                  
Shares Issued, Price Per Share $ 0.50                  
Percentage of Common Stock Issued To Investors to Total Number Of Shares 9.00%                  
Subsequent Event | Common Stock                    
Subsequent Event [Line Items]                    
Shares Issued, Price Per Share $ 0.50                  
Subsequent Event | Convertible Notes Payable                    
Subsequent Event [Line Items]                    
Outstanding balance of convertible note including accrued unpaid interest       $ 5,300,000            
Convertible note, redeemed amount   $ 125,000   $ 250,000 $ 150,000          
Subsequent Event | Series C convertible preferred stock                    
Subsequent Event [Line Items]                    
preferred stock, par or stated value     $ 1,000              
preferred stock, shares authorized     5,000              
Preferred Stock, Dividend Rate, Percentage     10.00%              
Convertible Preferred Stock Conversion Price     $ 0.50              
Preferred Stock, Shares Issued     3,246              
Subsequent Event | Warrants                    
Subsequent Event [Line Items]                    
Warrants to purchase common shares, shares 4,365,000                  
Private Placement                    
Subsequent Event [Line Items]                    
Exercise price of warrants, per share             $ 0.75      
Warrants to purchase common shares, shares             23,487,585      
Private Placement | Warrants                    
Subsequent Event [Line Items]                    
Exercise price of warrants, per share             $ 0.75      
Warrants to purchase common shares, shares             23,487,585      
Private Placement | Subsequent Event                    
Subsequent Event [Line Items]                    
Warrants to purchase common shares, shares     1,000,000