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)

v3.20.1
Stockholders' Equity - Significant Option Groups Outstanding and Exercisable Option and its Price and Contractual Life (Detail)
3 Months Ended
Feb. 29, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Outstanding | shares 1,114,743
Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 11 months 8 days
Outstanding, Weighted Average Exercise Price $ 3.49
Exercisable, Outstanding | shares 1,006,623
Exercisable, Weighted Average Exercise Price $ 3.06
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 10 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 245,000
Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 10 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 11 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) 6 years 4 months 6 days
Outstanding, Weighted Average Exercise Price $ 6.52
Exercisable, Outstanding | shares 2,111
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 11 months 26 days
Outstanding, Weighted Average Exercise Price $ 7.57
Exercisable, Outstanding | shares 132,283
Exercisable, Weighted Average Exercise Price $ 7.62