Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail)

v3.7.0.1
BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) - USD ($)
9 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation, number of stock options outstanding 4,580,543  
Aggregate unrecognized compensation cost of unvested options $ 0  
Share based compensation, number of stock options expired during period 2,000  
Stand-Alone Grants    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation, number of options issued during period 4,607,943  
Share based compensation, number of options exercised during period 400  
Share based compensation, number of stock options expired during period 27,000  
Operating Expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation cost included in operating expenses $ 180,333 $ 4,044,171
Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,980,543 4,605,543