Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.3.0.814
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
May. 31, 2015
May. 31, 2010
Summary Of Significant Accounting Policies [Line Items]        
Common stock, par value $ 0.001   $ 0.001  
Net loss $ (8,895,015) $ (3,379,520)    
Accumulated (deficit) (80,417,317)   $ (71,522,302)  
Balance in excess of federally insured limits 2,586,000   1,164,000  
Impairment charges 0 $ 0    
Pre-launch inventory qualified for capitalization $ 0   0  
Estimated future unvested option forfeitures 0.00%      
Direct costs associated with the convertible notes     $ 708,000  
Amortization of debt issuance costs $ 350,339      
Common stock options and warrants to purchase 40,003,836 30,936,361    
Additional common shares if convertible debt is converted to common stock 5,374,733      
Unrecognized benefits $ 0      
Reclassification Adjustment        
Summary Of Significant Accounting Policies [Line Items]        
Common stock, par value $ 0.001   $ 0.001  
Preferred stock, par value $ 0.001   0.001  
Convertible Debt        
Summary Of Significant Accounting Policies [Line Items]        
Debt instrument, face amount $ 4,031,050      
Equity Securities        
Summary Of Significant Accounting Policies [Line Items]        
Deferred offering costs $ 1,000,000      
Series B Convertible Preferred Stock        
Summary Of Significant Accounting Policies [Line Items]        
Common stock, par value       $ 0.001
Preferred stock, par value $ 0.001   $ 0.001 $ 0.001
Preferred Stock Shares authorized to be issued 400,000   400,000  
Common stock options and warrants to purchase 95,100   95,100  
Common shares issued upon conversion of preferred stock 951,000      
Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Preferred Stock Shares authorized to be issued 5,000,000      
Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Income tax examination, year under examination 2012