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)

v3.20.2
Stockholders' Equity - Significant Option Groups Outstanding and Exercisable Option and its Price and Contractual Life (Detail)
9 Months Ended
Aug. 31, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Outstanding | shares 1,121,743
Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 5 months 19 days
Outstanding, Weighted Average Exercise Price $ 3.52
Exercisable, Outstanding | shares 1,047,166
Exercisable, Weighted Average Exercise Price $ 3.23
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) 1 year 4 months 2 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 245,000
Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 4 months 6 days
Outstanding, Weighted Average Exercise Price $ 2.78
Exercisable, Outstanding | shares 245,000
Exercisable, Weighted Average Exercise Price $ 2.78
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 204,729
Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 5 months 23 days
Outstanding, Weighted Average Exercise Price $ 3.14
Exercisable, Outstanding | shares 204,729
Exercisable, Weighted Average Exercise Price $ 3.14
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 3,833
Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 10 months 2 days
Outstanding, Weighted Average Exercise Price $ 6.52
Exercisable, Outstanding | shares 2,944
Exercisable, Weighted Average Exercise Price $ 6.51
Range 5 [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 238,681
Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years 5 months 26 days
Outstanding, Weighted Average Exercise Price $ 7.57
Exercisable, Outstanding | shares 171,993
Exercisable, Weighted Average Exercise Price $ 7.62
Range 6 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices Minimum 9.01
Range of Exercise Prices Maximum $ 10.00
Outstanding, Outstanding | shares 7,000
Outstanding, Weighted Average Remaining Contractual Life (Years) 9 years 11 months 8 days
Outstanding, Weighted Average Exercise Price $ 9.10