Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity - Range of Expected Volatilities for Options (Detail)

v2.4.0.8
Stockholder's Equity - Range of Expected Volatilities for Options (Detail) (Service-Based Vesting Condition Options [Member])
9 Months Ended
Aug. 31, 2013
Service-Based Vesting Condition Options [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum expected volatility 108.75%
Maximum expected volatility 114.99%