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)

v3.19.3
Stockholders' Equity - Significant Option Groups Outstanding and Exercisable Option and its Price and Contractual Life (Detail)
9 Months Ended
Aug. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Outstanding | shares 1,103,830
Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 2 months 8 days
Outstanding, Weighted Average Exercise Price $ 3.26
Exercisable, Outstanding | shares 1,004,312
Exercisable, Weighted Average Exercise Price $ 2.83
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) 2 years 4 months 6 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 265,000
Outstanding, Weighted Average Remaining Contractual Life (Years) 2 years 4 months 9 days
Outstanding, Weighted Average Exercise Price $ 2.72
Exercisable, Outstanding | shares 265,000
Exercisable, Weighted Average Exercise Price $ 2.72
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) 6 years 6 months 7 days
Outstanding, Weighted Average Exercise Price $ 3.18
Exercisable, Outstanding | shares 227,229
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) 7 years 7 months 2 days
Outstanding, Weighted Average Exercise Price $ 6.95
Exercisable, Outstanding | shares 24,167
Exercisable, Weighted Average Exercise Price $ 6.97
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 164,101
Outstanding, Weighted Average Remaining Contractual Life (Years) 8 years 2 months 1 day
Outstanding, Weighted Average Exercise Price $ 7.63
Exercisable, Outstanding | shares 65,416
Exercisable, Weighted Average Exercise Price $ 7.69