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Common Stock and Common Stock Payable Issued for Services - Additional Information (Detail) (USD $)
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1 Months Ended | 12 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 28, 2012
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May 31, 2013
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May 31, 2012
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May 31, 2011
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May 31, 2010
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May 31, 2009
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May 31, 2008
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May 31, 2007
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Nov. 30, 2013
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May 31, 2013
Transaction 02
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May 31, 2012
Transaction 02
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Nov. 30, 2013
Director And Consultants
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Nov. 30, 2012
Director And Consultants
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Nov. 30, 2013
Director And Consultants
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Nov. 30, 2012
Director And Consultants
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May 31, 2013
Director
Transaction 01
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May 31, 2012
Director
Transaction 01
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May 31, 2013
Director
Transaction 01
Minimum
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May 31, 2013
Director
Transaction 01
Maximum
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May 31, 2013
Director
Transaction 02
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May 31, 2013
Consultant
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May 31, 2012
Consultant
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| Common Stock Issued For Services [Line Items] | ||||||||||||||||||||||
| Common stock issued | 66,116 | 108,000 | 400,000 | 51,520 | 10,000 | 60,000 | ||||||||||||||||
| Issue price per share | $ 1.30 | $ 0.80 | $ 1.60 | $ 2.68 | ||||||||||||||||||
| Stock-based compensation recognized | $ 3,261,951 | $ 1,692,290 | $ 952,316 | $ 1,671,118 | $ 371,996 | $ 461,602 | $ 535,984 | $ 388,000 | $ 0 | $ 21,000 | $ 0 | $ 186,000 | $ 49,000 | $ 35,000 | $ 161,000 | $ 203,000 | ||||||
| Settlement of trade payable | 447,000 | |||||||||||||||||||||
| Cash payment for service from previous principal law firm | 45,000 | |||||||||||||||||||||
| Common stock issued for service from previous principal law firm, value | 80,000 | 184,500 | 6,468 | |||||||||||||||||||
| Gain on satisfaction of trade payables | $ 322,000 | |||||||||||||||||||||