Quarterly report pursuant to Section 13 or 15(d)

Private Securities Offerings - Additional Information (Detail)

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Private Securities Offerings - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2017
Feb. 28, 2017
Jan. 31, 2017
Sep. 30, 2016
Jun. 30, 2016
May 31, 2016
Placement Agent            
Equity and Equity Units Offering Disclosure [Line Items]            
Exercise price of warrants, per share $ 0.825 $ 0.825 $ 0.825 $ 0.825    
Term of warrants 5 years 5 years 5 years 5 years    
Warrants to purchase common shares, shares 122,799 453,652 122,799 1,066,667    
Private Equity Offering            
Equity and Equity Units Offering Disclosure [Line Items]            
Exercise price of warrants, per share         $ 1.00  
Warrant covering common stock shares purchased, percentage         25.00%  
Common stock sold at private equity offering         729,500 48,659,338
Term of warrants         5 years 5 years
Warrants to purchase common shares, shares   774,097        
Proceeds from private equity offering         $ 729,500 $ 37,600,000
Private Equity Offering | Minimum            
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%
Private Equity Offering | Maximum            
Equity and Equity Units Offering Disclosure [Line Items]            
Exercise price of warrants, per share           $ 1.00
Warrant covering common stock shares purchased, percentage           25.00%
Private Equity Offering | Placement Agent            
Equity and Equity Units Offering Disclosure [Line Items]            
Warrants to purchase common shares, shares           4,960,314
Aggregate cash fee           $ 3,900,000
Vested restricted stock awards           2,700,000
Private Equity Offering | Warrants            
Equity and Equity Units Offering Disclosure [Line Items]            
Exercise price of warrants, per share         $ 1.35  
Warrants to purchase common shares, shares         182,375 23,254,230