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Subsequent Events - Additional Information (Detail) (USD $)
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6 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Nov. 30, 2013
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May 31, 2013
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May 31, 2012
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May 31, 2010
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May 31, 2013
Minimum
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Nov. 30, 2013
Convertible Debt
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May 31, 2013
Convertible Debt
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Jan. 03, 2014
Subsequent Event
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Dec. 04, 2013
Subsequent Event
Installment
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Dec. 23, 2013
Subsequent Event
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Dec. 31, 2013
Subsequent Event
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Aug. 30, 2013
Subsequent Event
Convertible Debt
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Jul. 31, 2013
Subsequent Event
Unsecured Convertible Promissory Notes
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Jul. 31, 2013
Subsequent Event
Unsecured Convertible Promissory Notes
Sale of Note Payable
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Jul. 31, 2013
Subsequent Event
Unsecured Convertible Promissory Notes
If Converted
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Jul. 31, 2013
Subsequent Event
Unsecured Convertible Promissory Notes
Minimum
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| Subsequent Event [Line Items] | ||||||||||||||||
| Issuance of promissory notes | $ 1,200,000 | |||||||||||||||
| Interest rate on notes | 5.00% | 5.00% | ||||||||||||||
| Maturity date | Feb. 01, 2014 | |||||||||||||||
| Proceeds from sale of securities | 3,000,000 | |||||||||||||||
| Convertible note conversion price Trigger per share | $ 0.65 | |||||||||||||||
| Conversion price decrease per share | $ 0.10 | |||||||||||||||
| Convertible note conversion price per share | $ 0.65 | $ 0.65 | $ 0.75 | $ 0.35 | ||||||||||||
| Warrant exercise period | 3 years | |||||||||||||||
| Warrants issued to purchase common stock | 80,000 | 923,072 | ||||||||||||||
| Common stock warrant exercise price | 0.75 | 0.75 | 0.50 | 0.75 | ||||||||||||
| Value Of Warrants | 1.30 | |||||||||||||||
| Class of warrant term | 5 years | |||||||||||||||
| Cash fee paid to a registered broker-dealer | 120,000 | |||||||||||||||
| Principal amount of notes | 7,221,250 | 6,588,250 | 4,621,250 | 6,021,250 | 920,000 | |||||||||||
| Aggregate principal amount plus accrued but unpaid interest | 2,350,000 | 567,000 | 146,456 | 100,000 | 12,071 | |||||||||||
| Common stock issued | 157,154 | 1,242,762 | ||||||||||||||
| Stock options , shares granted | 17,848,540 | 11,166,274 | 3,456,088 | 50,000 | ||||||||||||
| Stock options, exercise price | $ 1.09 | |||||||||||||||
| Stock option, vesting installments | 3 | |||||||||||||||
| Stock option , expire period | 5 years | |||||||||||||||
| Exercisable warrants, expire period | 5 years | 5 years | ||||||||||||||
| Percentage of deposit payment to consulting firm | 20.00% | |||||||||||||||
| Consulting fee | 789,917 | |||||||||||||||
| Aggregate principal amount plus accrued but unpaid interest | $ 2,151 | |||||||||||||||