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 $)
 6 Months Ended
May 31, 2013
Y
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Outstanding 1,118,926
Outstanding, Weighted Average Remaining Contractual Life (Years) 6.91
Outstanding, Weighted Average Exercise Price $ 2.11
Exercisable, Outstanding 958,111
Exercisable, Weighted Average Exercise Price $ 2.07
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) 1.90
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 520,926
Outstanding, Weighted Average Remaining Contractual Life (Years) 7.34
Outstanding, Weighted Average Exercise Price $ 1.69
Exercisable, Outstanding 510,929
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 590,500
Outstanding, Weighted Average Remaining Contractual Life (Years) 6.59
Outstanding, Weighted Average Exercise Price $ 2.50
Exercisable, Outstanding 439,682
Exercisable, Weighted Average Exercise Price $ 2.54
Range 4 [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