Quarterly report pursuant to Section 13 or 15(d)

Convertible Preferred Stock - Additional Information (Detail)

v3.7.0.1
Convertible Preferred Stock - Additional Information (Detail)
Jul. 25, 2017
USD ($)
shares
$ / shares
May 10, 2017
USD ($)
Investor
$ / shares
shares
Jun. 30, 2017
shares
Dec. 31, 2016
shares
Class of Stock [Line Items]        
Number of accredited investors | Investor   3    
Preferred stock, shares outstanding     20,000,000 20,000,000
Series A Preferred Stock [Member]        
Class of Stock [Line Items]        
Preferred stock, shares outstanding   12,000,000    
Voting rights   No voting rights    
Series A Preferred Stock [Member] | Subsequent Event [Member]        
Class of Stock [Line Items]        
Gross proceed of preferred stock | $ $ 3,000,000      
Convertible shares of common stock 12,000,000      
Fixed conversion price | $ / shares $ 0.25      
Series A Preferred Stock [Member] | Maximum [Member]        
Class of Stock [Line Items]        
Gross proceed of preferred stock | $   $ 3,000,000    
Series A Preferred Stock [Member] | Preferred Stock Issued Upon Initial Closing [Member]        
Class of Stock [Line Items]        
Gross proceed of preferred stock | $   $ 1,302,000    
Warrants to purchase common stock, issued   4,621,037    
Term of warrants   7 years    
Warrants exercise price per share | $ / shares   $ 0.31    
Series A Preferred Stock [Member] | Preferred Stock Issued Upon Second Closing [Member] | Subsequent Event [Member]        
Class of Stock [Line Items]        
Gross proceed of preferred stock | $ $ 1,698,000      
Warrants to purchase common stock, issued 6,024,124      
Term of warrants 7 years      
Warrants exercise price per share | $ / shares $ 0.31