Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Significant Option Groups Exercisable Option and its Price and Contractual Life (Detail)

v3.8.0.1
Stockholders' Equity - Significant Option Groups Exercisable Option and its Price and Contractual Life (Detail)
3 Months Ended
Feb. 28, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Outstanding | shares 1,019,729
Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 4 months 17 days
Outstanding, Weighted Average Exercise Price $ 2.51
Exercisable, Outstanding | shares 999,518
Exercisable, Weighted Average Exercise Price $ 2.45
Range 1 [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 | shares 422,500
Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 8 months 9 days
Outstanding, Weighted Average Exercise Price $ 1.73
Exercisable, Outstanding | shares 422,500
Exercisable, Weighted Average Exercise Price $ 1.73
Range 2 [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 | shares 345,000
Outstanding, Weighted Average Remaining Contractual Life (Years) 2 years 6 months 14 days
Outstanding, Weighted Average Exercise Price $ 2.69
Exercisable, Outstanding | shares 345,000
Exercisable, Weighted Average Exercise Price $ 2.69
Range 3 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices Minimum 3.01
Range of Exercise Prices Maximum $ 4.00
Outstanding, Outstanding | shares 227,229
Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years 11 months 1 day
Outstanding, Weighted Average Exercise Price $ 3.18
Exercisable, Outstanding | shares 218,896
Exercisable, Weighted Average Exercise Price $ 3.18
Range 4 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices Minimum 6.01
Range of Exercise Prices Maximum $ 7.00
Outstanding, Outstanding | shares 25,000
Outstanding, Weighted Average Remaining Contractual Life (Years) 9 years 1 month 2 days
Outstanding, Weighted Average Exercise Price $ 6.95
Exercisable, Outstanding | shares 13,122
Exercisable, Weighted Average Exercise Price $ 7.00