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Stock Options and Warrants - Additional Information (Detail) (USD $)
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6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Nov. 30, 2013
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Nov. 30, 2012
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Nov. 30, 2013
Maximum
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Nov. 30, 2013
Minimum
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Nov. 30, 2013
Common Stock Warrants
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Nov. 30, 2013
Holders of Notes
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Oct. 23, 2013
Private Equity Offering
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Nov. 30, 2013
Private Equity Offering
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Nov. 30, 2013
Private Equity Offering
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Nov. 30, 2013
Private Equity Offering
After amendment
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Nov. 30, 2013
Stock Options
Consultant
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Nov. 30, 2013
2012 Equity Incentive Plan
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Nov. 30, 2012
2012 Equity Incentive Plan
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Nov. 30, 2013
2012 Equity Incentive Plan
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Nov. 30, 2012
2012 Equity Incentive Plan
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Nov. 30, 2013
2012 Equity Incentive Plan
Stock Options
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Nov. 30, 2013
2012 Equity Incentive Plan
Stock Options
Director
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Nov. 30, 2013
2012 Equity Incentive Plan
Stock Options
Director
Maximum
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Nov. 30, 2013
2012 Equity Incentive Plan
Stock Options
Director
Minimum
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Nov. 30, 2013
2012 Equity Incentive Plan
Stock Options 2
Director
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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 issuance | 3,000,000 | |||||||||||||||||||
| Shares available for future stock-based grants | 1,742,874 | |||||||||||||||||||
| Stock options , shares granted | 17,848,540 | 305,000 | 233,836 | |||||||||||||||||
| Stock options granted, exercise price | $ 0.74 | $ 0.75 | $ 0.99 | $ 0.80 | ||||||||||||||||
| Percentage of option awards vest at per quarter | 25.00% | |||||||||||||||||||
| Stock options, vesting period | 1 year | |||||||||||||||||||
| Grant date fair value of options | $ 0.43 | $ 0.48 | ||||||||||||||||||
| Warrants exercisable period | 5 years | |||||||||||||||||||
| Number of warrants issued | 923,072 | |||||||||||||||||||
| Exercisable warrants, exercise price | 0.75 | 0.50 | 0.75 | 0.75 | 0.75 | 0.75 | ||||||||||||||
| Warrants attached with convertible promissory notes | $ 1,200,000 | |||||||||||||||||||
| Number of shares issued | 2 | 2 | 20,989,494 | 2 | ||||||||||||||||
| Warrants to purchase common shares, shares | 1 | |||||||||||||||||||
| Value of unit at conversion right | $ 1.30 | |||||||||||||||||||
| Exercisable warrants, expire period | 5 years | 5 years | 7 years | |||||||||||||||||
| Stock options, termination date | Sep. 04, 2018 | |||||||||||||||||||
| Stock options, number of shares vested on date of issuance | 50,000 | |||||||||||||||||||
| Stock options, number of shares vested monthly after initial issuance | 15,000 | |||||||||||||||||||
| Consulting agreement term | 18 months | 6 months | ||||||||||||||||||
| Stock warrants exercised | 50,000 | |||||||||||||||||||
| Warrants exercise price per share | $ 1.00 | |||||||||||||||||||
| Proceeds from exercise of warrants | 50,000 | 193,000 | ||||||||||||||||||
| Number of common stock warrants issued | 11,153,850 | 11,153,850 | 4,940,092 | |||||||||||||||||
| Proceeds from units sold at private equity offering | 14,500,000 | 14,500,000 | ||||||||||||||||||
| Purchase Price of warrant | 1.30 | 1.30 | ||||||||||||||||||
| Warrant to purchase common share | 1 | 1 | 1 | |||||||||||||||||
| Grant date fair value of warrants | $ 1.03 | |||||||||||||||||||
| Compensation expense related to stock options and warrants | 261,000 | 487,000 | 742,000 | 2,354,000 | ||||||||||||||||
| Grant date fair value of options | 459,000 | 1,574,000 | 6,433,000 | 8,525,000 | ||||||||||||||||
| Grant date fair value of warrants vested | 459,000 | 1,574,000 | 6,433,000 | 8,525,000 | ||||||||||||||||
| Unrecognized compensation costs | $ 1,506,000 | $ 1,506,000 | ||||||||||||||||||
| Weighted average period over which unrecognized compensation costs is expected to be recognized | 2 years 1 month 2 days | |||||||||||||||||||