Quarterly report pursuant to Section 13 or 15(d)

Stock Options - Fair Value of Options Granted (Detail)

v2.4.0.8
Stock Options - Fair Value of Options Granted (Detail)
3 Months Ended 9 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2013
Aug. 31, 2012
Service-Based Vesting Condition Options [Member]
       
Weighted average values:        
Expected dividends 0.00% 0.00% 0.00% 0.00%
Expected volatility 108.75% 115.76% 110.46% 112.50%
Risk free interest rate 1.35% 0.74% 1.15% 0.90%
Expected life 5 years 5 years 5 years 5 years 7 months 6 days
Performance and Market-Based Vesting Condition Options [Member]
       
Weighted average values:        
Expected dividends       0.00%
Expected volatility       107.03%
Risk free interest rate       1.00%
Expected life       6 years 4 months 24 days