Annual report pursuant to Section 13 and 15(d)

Activity Related to Notes (Detail)

v3.10.0.1
Activity Related to Notes (Detail) - USD ($)
12 Months Ended
Jan. 31, 2018
May 31, 2018
May 31, 2016
May 31, 2017
Debt Instrument [Line Items]        
Note repayment   $ (259,157) $ (789,140)  
2017 Short Term Convertible Notes        
Debt Instrument [Line Items]        
Face amount of Notes   6,038,500   $ 1,150,000
Unamortized discount       (92,000)
Registered direct equity offering   (5,788,500)    
Note repayment $ (259,000) $ (250,000)    
Carrying value of Notes, net       $ 1,058,000
Short-Term Convertible Notes        
Debt Instrument [Line Items]        
Face amount of Notes 6,300,000   3,981,050  
Note repayment $ (259,000)   (789,000)  
Conversions     (525,000)  
Payments upon maturity     (762,250)  
Short-Term Convertible Notes | Tender Offer        
Debt Instrument [Line Items]        
Conversions     $ (2,693,800)