Quarterly report pursuant to Section 13 or 15(d)

Weighted Average Assumptions to Value Investor Warrants (Detail)

v3.3.1.900
Weighted Average Assumptions to Value Investor Warrants (Detail) - $ / shares
6 Months Ended 12 Months Ended
Nov. 30, 2015
May. 31, 2015
Detachable Common Stock Warrants    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Expected dividend yield 0.00% 0.00%
Stock price volatility   88.79%
Expected term 1 year 5 years
Risk-free interest rate 0.33%  
Investor Warrants    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Expected dividend yield 0.00%  
Stock price volatility 88.79%  
Expected term 5 years  
Minimum | Detachable Common Stock Warrants    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Stock price volatility 64.56%  
Risk-free interest rate   1.46%
Grant-date fair value $ 0.15 $ 0.52
Minimum | Investor Warrants    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Risk-free interest rate 1.46%  
Grant-date fair value $ 0.52  
Maximum | Detachable Common Stock Warrants    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Stock price volatility 69.30%  
Risk-free interest rate   1.58%
Grant-date fair value $ 0.18 $ 0.76
Maximum | Investor Warrants    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Risk-free interest rate 1.58%  
Grant-date fair value $ 0.76