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Common Stock and Common Stock Payable Issued for Services - Additional Information (Detail) (USD $)
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12 Months Ended | 12 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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May 31, 2014
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May 31, 2013
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May 31, 2014
Minimum
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May 31, 2013
Minimum
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May 31, 2014
Maximum
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May 31, 2013
Maximum
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May 31, 2013
Director
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May 31, 2013
Director
Minimum
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May 31, 2013
Director
Maximum
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May 31, 2013
Consultant
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Dec. 28, 2012
Previous Principal Law Firm
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May 31, 2013
Previous Principal Law Firm
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May 31, 2014
Executives
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May 31, 2013
Executives
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| Common Stock Issued For Services [Line Items] | ||||||||||||||
| Common stock issued for services | 51,520 | 60,000 | 66,116 | 53,601 | ||||||||||
| Issue price per share | $ 0.40 | $ 0.56 | $ 0.67 | $ 0.89 | $ 0.80 | $ 1.60 | $ 2.68 | |||||||
| Stock-based compensation recognized | $ 928,413 | $ 3,261,951 | $ 49,000 | $ 161,000 | $ 0 | $ 108,000 | ||||||||
| Settlement of trade payable | 447,000 | |||||||||||||
| Cash payment for service from previous principal law firm | 45,000 | |||||||||||||
| Common stock issued for services, value | 80,000 | |||||||||||||
| Gain on settlement of accounts payable | 183,944 | 372,759 | 322,000 | |||||||||||
| Common stock payable | $ 117,778 | $ 108,000 | ||||||||||||