Annual report pursuant to Section 13 and 15(d)

Related Party Transactions - Additional Information (Detail)

v3.10.0.1
Related Party Transactions - Additional Information (Detail) - USD ($)
 12 Months Ended
Nov. 08, 2017
Jul. 28, 2017
Jul. 26, 2017
Jun. 23, 2015
May 31, 2018
May 31, 2017
May 31, 2016
Mar. 23, 2018
Jun. 30, 2016
May 31, 2015
Feb. 06, 2015
Sep. 26, 2014
Related Party Transaction [Line Items]                        
Warrants to purchase common shares, shares               3,027,263        
Private Equity Offering                        
Related Party Transaction [Line Items]                        
Proceeds from private equity offering         $ 17,600,000 $ 729,500 $ 37,600,000          
Warrants to purchase common shares, shares         35,286,904       182,375      
Exercise price of warrants, per share         $ 0.75 $ 1.00     $ 1.35      
Alpha Venture Capital Partners, L.P.                        
Related Party Transaction [Line Items]                        
Warrants to purchase common shares, shares   33,333                    
Exercise price of warrants, per share   $ 1.00                    
Alpha Venture Capital Partners, L.P. | 2-Year Unsecured Convertible Promissory Note                        
Related Party Transaction [Line Items]                        
Face amount of notes                   $ 2,000,000 $ 1,500,000 $ 2,000,000
Common stock issued upon conversion of notes       1,000,000                
Alpha Venture Capital Partners, L.P. | Short Term Convertible Promissory Notes                        
Related Party Transaction [Line Items]                        
Purchased short term convertible promissory note interest   7.00%                    
Proceeds from private equity offering   $ 50,000                    
Jordan G. Naydenov | Private Equity Offering                        
Related Party Transaction [Line Items]                        
Warrants to purchase common shares, shares     66,666                  
Exercise price of warrants, per share     $ 1.00                  
Jordan G. Naydenov | Short Term Convertible Promissory Notes | Private Equity Offering                        
Related Party Transaction [Line Items]                        
Purchased short term convertible promissory note interest     7.00%                  
Proceeds from private equity offering     $ 100,000                  
Anthony D Caracciolo                        
Related Party Transaction [Line Items]                        
Warrants to purchase common shares, shares           333,333            
Exercise price of warrants, per share         $ 1.00 $ 1.35            
Anthony D Caracciolo | Private Equity Offering                        
Related Party Transaction [Line Items]                        
Stock and warrants issued during period value common stock and warrants $ 100,000                      
Anthony D Caracciolo | Short Term Convertible Promissory Notes                        
Related Party Transaction [Line Items]                        
Purchased short term convertible promissory note interest           7.00%            
Proceeds from private equity offering           $ 1,000,000