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 6 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Nov. 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  
Term of warrants 5 years   5 years  
Warrants to purchase common shares, shares 1,066,667   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 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