Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.5.0.2
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Aug. 31, 2016
Aug. 31, 2015
May 31, 2015
Aug. 24, 2016
May 31, 2016
Mar. 18, 2016
Mar. 17, 2016
Apr. 30, 2010
Summary Of Significant Accounting Policies [Line Items]                
Net loss $ (5,354,385) $ (8,895,015)            
Accumulated (deficit) (102,580,299)       $ (97,225,914)      
Balance in excess of federally insured limits 4,200,000       9,400,000      
Impairment charges 0 0            
Pre-launch inventory qualified for capitalization $ 0       $ 0      
Estimated future unvested forfeitures 0.00%              
Common stock, shares authorized 350,000,000     350,000,000 250,000,000 250,000,000 200,000,000 100,000,000
Direct costs associated with the convertible notes     $ 709,000          
Amortization of debt issuance costs   $ 350,339            
Common stock options and warrants to purchase 62,588,165 40,003,836            
Unrecognized benefits $ 0              
Equity Securities                
Summary Of Significant Accounting Policies [Line Items]                
Deferred offering costs 61,000 $ 1,000,000            
Short-Term Convertible Notes                
Summary Of Significant Accounting Policies [Line Items]                
Amortization of debt issuance costs $ 0 $ 350,339            
Series B Convertible Preferred Stock                
Summary Of Significant Accounting Policies [Line Items]                
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