Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Stockholders' Equity - Significant Option Groups Outstanding and Exercisable Option and its Price and Contractual Life (Detail)
 6 Months Ended
May 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Outstanding | shares 1,065,365
Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 2 months 19 days
Outstanding, Weighted Average Exercise Price $ 2.77
Exercisable, Outstanding | shares 1,016,358
Exercisable, Weighted Average Exercise Price $ 2.57
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 5 months 4 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 339,000
Outstanding, Weighted Average Remaining Contractual Life (Years) 2 years 3 months 29 days
Outstanding, Weighted Average Exercise Price $ 2.70
Exercisable, Outstanding | shares 339,000
Exercisable, Weighted Average Exercise Price $ 2.70
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 8 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) 8 years 10 months 2 days
Outstanding, Weighted Average Exercise Price $ 6.95
Exercisable, Outstanding | shares 18,747
Exercisable, Weighted Average Exercise Price $ 7.00
Range Five [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices Minimum 7.01
Range of Exercise Prices Maximum $ 8.00
Outstanding, Outstanding | shares 51,636
Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 6 months 29 days
Outstanding, Weighted Average Exercise Price $ 7.85
Exercisable, Outstanding | shares 17,215
Exercisable, Weighted Average Exercise Price $ 7.85