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Stock Options - Additional Information (Detail) (USD $)
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6 Months Ended | 12 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | |||||||||||||||||
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May 31, 2013
Executives and Consultants [Member]
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Nov. 30, 2012
Executives and Consultants [Member]
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May 31, 2013
Service-Based Vesting Condition Options [Member]
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Nov. 30, 2012
Service-Based Vesting Condition Options [Member]
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May 31, 2013
Performance Shares [Member]
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Nov. 30, 2012
Performance Shares [Member]
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May 31, 2013
Market-Based Vesting Condition Options [Member]
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May 31, 2012
Market-Based Vesting Condition Options [Member]
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May 31, 2013
Performance and Market-Based Vesting Condition Options [Member]
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Nov. 30, 2012
Performance and Market-Based Vesting Condition Options [Member]
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May 31, 2013
Stock Option [Member]
Service-Based Vesting Condition Options [Member]
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May 31, 2012
Stock Option [Member]
Service-Based Vesting Condition Options [Member]
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May 31, 2012
Stock Option [Member]
Performance Shares [Member]
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May 31, 2012
Stock Option [Member]
Performance and Market-Based Vesting Condition Options [Member]
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May 31, 2012
Stock Option [Member]
Performance and Market-Based Vesting Condition Options [Member]
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May 31, 2013
2000 Plan [Member]
Employee Stock Incentive Plan [Member]
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Nov. 30, 2012
2000 Plan [Member]
Employee Stock Incentive Plan [Member]
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May 31, 2013
2000 Plan [Member]
Service-Based Vesting Condition Options [Member]
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May 31, 2013
2006 Plan [Member]
Employee Stock Incentive Plan [Member]
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Nov. 30, 2012
2006 Plan [Member]
Employee Stock Incentive Plan [Member]
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May 31, 2013
2006 Plan [Member]
Service-Based Vesting Condition Options [Member]
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May 31, 2012
2012 Plan [Member]
Employee Stock Incentive Plan [Member]
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May 31, 2013
2012 Plan [Member]
Employee Stock Incentive Plan [Member]
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Nov. 30, 2012
2012 Plan [Member]
Employee Stock Incentive Plan [Member]
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May 31, 2013
2012 Plan [Member]
Service-Based Vesting Condition Options [Member]
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May 31, 2013
2012 Plan [Member]
Performance Options [Member]
Employee Stock Incentive Plan [Member]
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May 31, 2013
Minimum [Member]
2000 Plan [Member]
Employee Stock Incentive Plan [Member]
Y
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May 31, 2013
Maximum [Member]
2000 Plan [Member]
Employee Stock Incentive Plan [Member]
Y
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||||||||||||
| Common stock for issuance pursuant to stock options or restricted stock | 2,250,000 | 1,000,000 | 1,500,000 | |||||||||||||||||||||||||
| Term of options | 5 | 7 | ||||||||||||||||||||||||||
| Vesting period ranging from, date of grant | 3 years | |||||||||||||||||||||||||||
| Options exercisable period after termination | 90 days | |||||||||||||||||||||||||||
| Granted, Shares | 1,118,926 | 1,183,098 | 640,000 | 640,000 | 17,500 | 60,589 | 1,000,000 | |||||||||||||||||||||
| Shares issued under 2000 stock incentive plan | 0 | 149,095 | 1,500,000 | |||||||||||||||||||||||||
| Share issued | 741,426 | 762,509 | ||||||||||||||||||||||||||
| Increase in common stock reserved for issuance | 2,500,000 | |||||||||||||||||||||||||||
| Weighted average grant date fair value of options | $ 1.67 | $ 1.51 | $ 1.38 | $ 1.28 | ||||||||||||||||||||||||
| Number of share issued to option holder | 7,500 | |||||||||||||||||||||||||||
| Options exercised | $ 11,825 | |||||||||||||||||||||||||||
| Share receive for option exercises | 7,500 | 33,562 | ||||||||||||||||||||||||||
| Number of option surrendered | 70,172 | 26,749 | ||||||||||||||||||||||||||
| Issuance of common stock to cover the total cost of exercising the stock option | 6,813 | |||||||||||||||||||||||||||
| Unrecognized compensation cost related to non-vested share-based compensation arrangements granted | 616,000 | 616,000 | 101,700 | 151,000 | 151,000 | 151,000 | ||||||||||||||||||||||
| Weighted-average period | 1 year 3 months 18 days | |||||||||||||||||||||||||||
| Total fair value of shares vested | 131,000 | |||||||||||||||||||||||||||
| Granted, Shares | 13,500 | 0 | 0 | |||||||||||||||||||||||||
| Granted, Shares | 213,334 | 426,666 | ||||||||||||||||||||||||||
| Share based compensation recognized on achievement of performance targets | 0 | 0 | ||||||||||||||||||||||||||
| Compensation expenses recognized without performance target achievement | $ 0 | $ 0 | ||||||||||||||||||||||||||