Quarterly report pursuant to Section 13 or 15(d)

Stock Options - Significant Option Groups Outstanding and Exercisable Option and its Price and Contractual Life (Detail)

v2.4.0.8
Stock Options - Significant Option Groups Outstanding and Exercisable Option and its Price and Contractual Life (Detail) (USD $)
9 Months Ended
Aug. 31, 2013
Y
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Outstanding 1,128,926
Outstanding, Weighted Average Remaining Contractual Life (Years) 6.72
Outstanding, Weighted Average Exercise Price $ 2.11
Exercisable, Outstanding 994,147
Exercisable, Weighted Average Exercise Price $ 2.10
Range 1 [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices Minimum $ 0.42
Range of Exercise Prices Maximum $ 1.00
Outstanding, Outstanding 7,500
Outstanding, Weighted Average Remaining Contractual Life (Years) 1.65
Outstanding, Weighted Average Exercise Price $ 0.78
Exercisable, Outstanding 7,500
Exercisable, Weighted Average Exercise Price $ 0.78
Range 2 [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 533,426
Outstanding, Weighted Average Remaining Contractual Life (Years) 7.18
Outstanding, Weighted Average Exercise Price $ 1.70
Exercisable, Outstanding 506,134
Exercisable, Weighted Average Exercise Price $ 1.69
Range 3 [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 588,000
Outstanding, Weighted Average Remaining Contractual Life (Years) 6.36
Outstanding, Weighted Average Exercise Price $ 2.50
Exercisable, Outstanding 480,513
Exercisable, Weighted Average Exercise Price $ 2.54