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Cash and Cash Equivalents and Liquidity (Details) (USD $)
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3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 63 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Apr. 30, 2013
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Apr. 30, 2012
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Jan. 31, 2013
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Jul. 31, 2008
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Apr. 30, 2013
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Apr. 30, 2012
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Jul. 31, 2012
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Jul. 31, 2011
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Jul. 31, 2010
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Jul. 31, 2009
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Apr. 30, 2013
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| Cash and Cash Equivalents and Liquidity | |||||||||||
| Losses in all previous reporting periods from inception to date | $ 1,728,659 | $ 811,574 | $ 3,648,913 | $ 7,187 | $ 5,377,572 | $ 771,391 | $ 2,364,852 | $ 3,758,817 | $ 36,158 | $ 33,714 | $ 11,578,300 |