Annual report pursuant to Section 13 and 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
Sep. 30, 2016
Jun. 30, 2016
May 31, 2017
May 31, 2016
Equity and Equity Units Offering Disclosure [Line Items]            
Common stock, par value         $ 0.001 $ 0.001
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 1,066,667   576,451  
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
Common stock, par value           $ 0.001
Proceeds from private equity offering       $ 729,500   $ 37,600,000
Term of warrants       5 years   5 years
Warrants to purchase common shares, shares         774,097  
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
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%