Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Stockholders' Equity - Significant Option Groups Exercisable Option and its Price and Contractual Life (Detail)
3 Months Ended
Feb. 28, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Outstanding | shares 993,865
Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 9 months
Outstanding, Weighted Average Exercise Price $ 2.78
Exercisable, Outstanding | shares 970,821
Exercisable, Weighted Average Exercise Price $ 2.68
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 8 months 8 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 267,500
Outstanding, Weighted Average Remaining Contractual Life (Years) 2 years 1 month 17 days
Outstanding, Weighted Average Exercise Price $ 2.72
Exercisable, Outstanding | shares 267,500
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 11 months 1 day
Outstanding, Weighted Average Exercise Price $ 3.18
Exercisable, Outstanding | shares 223,062
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 1 month 2 days
Outstanding, Weighted Average Exercise Price $ 6.95
Exercisable, Outstanding | shares 23,334
Exercisable, Weighted Average Exercise Price $ 6.98
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 51,636
Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 9 months 29 days
Outstanding, Weighted Average Exercise Price $ 7.85
Exercisable, Outstanding | shares 34,425
Exercisable, Weighted Average Exercise Price $ 7.85