Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.8.0.1
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Nov. 30, 2017
Nov. 30, 2016
May 31, 2017
Aug. 24, 2017
Aug. 24, 2016
Mar. 18, 2016
Mar. 17, 2016
Apr. 30, 2010
Summary Of Significant Accounting Policies [Line Items]                    
Net loss $ (10,947,685) $ (5,467,336) $ (22,575,959) $ (10,821,721)            
Accumulated (deficit) (145,565,674)   (145,565,674)   $ (122,989,715)          
Balance in excess of federally insured limits 1,200,000   1,200,000   1,500,000          
Impairment charges 0 $ 0 0 $ 0            
Pre-launch inventory qualified for capitalization $ 0   $ 0   $ 0          
Estimated future unvested forfeitures     0.00%              
Common stock, shares authorized 375,000,000   375,000,000   350,000,000 375,000,000 350,000,000 250,000,000 200,000,000 100,000,000
Amortization of discount on convertible notes     $ 1,172,995              
Direct costs associated with the convertible notes     400,000              
Amortization of debt issuance costs     $ 282,129              
Common stock options and warrants to purchase     87,551,801 64,415,987            
Unrecognized benefits $ 0   $ 0              
Equity Securities                    
Summary Of Significant Accounting Policies [Line Items]                    
Deferred offering costs 400,000   400,000   $ 1,800,000          
Short-Term Convertible Notes                    
Summary Of Significant Accounting Policies [Line Items]                    
Debt discount 493,000   493,000   92,000          
Amortization of debt issuance costs     300,000              
Short-Term Convertible Notes | Detachable Common Stock Warrants                    
Summary Of Significant Accounting Policies [Line Items]                    
Debt discount $ 1,600,000   1,600,000   92,000.0          
Amortization of discount on convertible notes     $ 1,200,000   $ 0          
Series B Convertible Preferred Stock                    
Summary Of Significant Accounting Policies [Line Items]                    
Preferred Stock Shares authorized to be issued 400,000   400,000   400,000          
Common stock options and warrants to purchase 92,100   92,100   92,100          
Common shares issued upon conversion of preferred stock     921,000              
Maximum                    
Summary Of Significant Accounting Policies [Line Items]                    
Preferred Stock Shares authorized to be issued 5,000,000   5,000,000