Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity - Significant Option Groups Outstanding and Exercisable Option and its Price and Contractual Life (Detail)

v3.2.0.727
Stockholder's Equity - Significant Option Groups Outstanding and Exercisable Option and its Price and Contractual Life (Detail) - May. 31, 2015 - $ / shares
Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Outstanding 984,764
Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 4 months 24 days
Outstanding, Weighted Average Exercise Price $ 2.14
Exercisable, Outstanding 976,428
Exercisable, Weighted Average Exercise Price $ 2.14
Range 1 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices Minimum 0.42
Range of Exercise Prices Maximum $ 1.00
Outstanding, Outstanding 2,500
Outstanding, Weighted Average Remaining Contractual Life (Years) 2 months 16 days
Outstanding, Weighted Average Exercise Price $ 0.68
Exercisable, Outstanding 2,500
Exercisable, Weighted Average Exercise Price $ 0.68
Range 2 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices Minimum 1.01
Range of Exercise Prices Maximum $ 2.00
Outstanding, Outstanding 466,764
Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 11 months 23 days
Outstanding, Weighted Average Exercise Price $ 1.72
Exercisable, Outstanding 465,931
Exercisable, Weighted Average Exercise Price $ 1.72
Range 3 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices Minimum 2.01
Range of Exercise Prices Maximum $ 3.00
Outstanding, Outstanding 515,500
Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 10 months 24 days
Outstanding, Weighted Average Exercise Price $ 2.53
Exercisable, Outstanding 507,997
Exercisable, Weighted Average Exercise Price $ 2.53