Stockholders' Equity - Summary of Warrant Exercises (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Class of Warrant or Right [Line Items]    
Number of Warrants 53,093,902 0
Total Proceeds $ 558,000  
Mayne [Member]    
Class of Warrant or Right [Line Items]    
Number of Warrants 10,250,569  
Exercise Price $ 0.0878  
Total Proceeds $ 900,000  
Mayne [Member]    
Class of Warrant or Right [Line Items]    
Number of Warrants 33,333,333  
Exercise Price $ 0.0750  
Total Proceeds $ 2,500,001  
Mayne [Member]    
Class of Warrant or Right [Line Items]    
Number of Warrants 4,860,000  
Exercise Price $ 0.1200  
Total Proceeds $ 583,200  
Total Mayne Exercises [Member]    
Class of Warrant or Right [Line Items]    
Number of Warrants 48,443,902  
Total Proceeds $ 3,983,201  
May 2016 Financing Finders [Member]    
Class of Warrant or Right [Line Items]    
Number of Warrants 150,000  
Exercise Price $ 0.1200  
Total Proceeds $ 18,000  
May 2016 Financing Investors [Member]    
Class of Warrant or Right [Line Items]    
Number of Warrants 4,500,000  
Exercise Price $ 0.1200  
Total Proceeds $ 540,000  
Mayne and May 2016 [Member]    
Class of Warrant or Right [Line Items]    
Number of Warrants 53,093,902  
Total Proceeds $ 4,541,201