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Stock Options and Warrants - Additional Information (Detail) (USD $)
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6 Months Ended | 109 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | |||||||||
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Nov. 30, 2012
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Nov. 30, 2012
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Nov. 30, 2012
Investor
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Nov. 30, 2012
2004 Stock Incentive Plan
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Nov. 30, 2011
2004 Stock Incentive Plan
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Nov. 30, 2012
2004 Stock Incentive Plan
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Nov. 30, 2011
2004 Stock Incentive Plan
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Nov. 30, 2012
2004 Stock Incentive Plan
Stock Options
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Nov. 30, 2012
2004 Stock Incentive Plan
Stock Options
Director
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Nov. 30, 2012
2004 Stock Incentive Plan
Stock Options
Employees
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Nov. 30, 2012
2004 Stock Incentive Plan
Warrant
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Nov. 30, 2012
2004 Stock Incentive Plan
Warrant
Consultant
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Nov. 30, 2012
2004 Stock Incentive Plan
Warrant
Consultant
Minimum
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Nov. 30, 2012
2004 Stock Incentive Plan
Warrant
Consultant
Maximum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||
| Authorized shares that can be purchased for options and warrants issued | 7,600,000 | 7,600,000 | ||||||||||||
| Shares available for future stock option grants | 3,658,500 | |||||||||||||
| Stock options granted, shares | 9,145,676 | 125,000 | 225,000 | |||||||||||
| Stock options granted, exercise price | $ 1.70 | $ 1.55 | $ 1.80 | |||||||||||
| Vesting terms of options granted to directors | Vest in quarterly increments over one year | |||||||||||||
| Expiration date of stock option | 5 years | 3 years | ||||||||||||
| Grant date fair value of options | $ 0.92 | $ 0.89 | ||||||||||||
| Percentage of stock options vested immediately | 50.00% | |||||||||||||
| Fifty percent of remaining options vesting date | 2013-10 | |||||||||||||
| Shares against which warrants granted to consultants | 750,000 | 515,000 | ||||||||||||
| Warrants granted, exercise price | $ 1.00 | $ 5.00 | ||||||||||||
| Warrants latest vesting date | Apr. 30, 2013 | |||||||||||||
| Warrants expiration dates | 2014-09 | 2015-10 | ||||||||||||
| Fair value of warrants | $ 0.56 | |||||||||||||
| Exercise price | $ 0.25 | |||||||||||||
| Warrants to purchase common shares, shares | 7,530,676 | |||||||||||||
| Grant date fair value of warrants | $ 0.77 | |||||||||||||
| Net cash proceeds from exercise of common stock warrants | $ 192,500 | $ 547,750 | $ 192,500 | |||||||||||
| Compensation expense related to stock options and warrants | 1,128,000 | 742,000 | 550,000 | 2,354,000 | 791,000 | |||||||||
| Grant date fair value of options and warrants vested | 6,433,000 | 245,000 | 8,525,000 | 456,000 | ||||||||||
| Unrecognized compensation costs | $ 2,402,000 | $ 2,402,000 | ||||||||||||
| Weighted average period over which unrecognized compensation costs is expected to be recognized | 1 year 9 months 4 days | |||||||||||||