Fair Value of Options Granted Using Black-Scholes Option Pricing Model (Detail) |
6 Months Ended | |
|---|---|---|
May. 31, 2015 |
May. 31, 2014 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected volatility | 73.20% | 64.80% |
| Expected dividends | 0.00% | 0.00% |
| Expected term | 9 years 3 months 18 days | 6 years |
| Risk-free rate | 1.47% | 1.26% |