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Common Stock Issued for Services - Additional Information (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 9 Months Ended | 112 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||
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Dec. 28, 2012
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Feb. 28, 2013
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Feb. 28, 2013
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Feb. 28, 2013
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Feb. 28, 2012
Consultant
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Feb. 29, 2012
Consultant
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Feb. 28, 2013
Consultant
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Feb. 28, 2012
Consultant
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Feb. 29, 2012
Consultant
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Feb. 28, 2013
Director
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Feb. 28, 2013
Director
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Feb. 28, 2013
Director
Transaction 01
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Feb. 28, 2013
Director
Transaction 02
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| Common Stock Issued For Services [Line Items] | |||||||||||||
| Common stock issued | 66,116 | 72,500 | 60,000 | 72,500 | 12,500 | 24,040 | |||||||
| Issue price per share | $ 2.80 | $ 2.68 | $ 2.80 | $ 1.00 | |||||||||
| Stock-based compensation recognized | $ 0 | $ 203,000 | $ 161,000 | $ 203,000 | $ 12,500 | $ 37,500 | |||||||
| 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 | ||||||||||||
| Gain on satisfaction of trade payables | $ 322,333 | $ 372,759 | $ 710,101 | ||||||||||