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Private Placements and Public Offerings (Details 2) (USD $)
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1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 54 Months Ended | 63 Months Ended | 11 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 0 Months Ended | |||||||
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Jun. 30, 2011
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Mar. 31, 2011
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Apr. 30, 2012
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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, 2012
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Apr. 30, 2013
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Dec. 12, 2012
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Mar. 28, 2012
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Jun. 24, 2011
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Jun. 24, 2011
Common Stock
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Mar. 28, 2012
Warrants
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Mar. 31, 2012
Warrants
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Jul. 31, 2012
Warrants
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Jul. 31, 2011
Warrants
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Jun. 24, 2011
Warrants issued with March 2011 Private Placement
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Mar. 28, 2012
Series A Warrant
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Jun. 24, 2011
Series B Warrant
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| Derivative Liabilities | |||||||||||||||||||
| Proceeds available for allocation | $ 0 | $ 0 | |||||||||||||||||
| Estimated fair value of derivative liabilities | 657,604 | 3,808,590 | 657,604 | ||||||||||||||||
| Total proceeds of private placement | 3,000,000 | 1,092,000 | 3,000,000 | ||||||||||||||||
| Fair value of derivative liabilities in excess of proceeds | (808,590) | (808,590) | (808,590) | (808,590) | |||||||||||||||
| Adjustments to fair value of derivative liabilities | $ 1,613,329 | $ 4,192,781 | $ 4,192,781 | $ (1,041,795) | $ 3,150,986 | $ 3,150,985 | $ 4,192,781 | $ (1,041,795) | |||||||||||
| Derivative liabilities valuation assumptions using Monte Carlo valuation model | |||||||||||||||||||
| Closing price per share of common stock (in dollars per share) | $ 0.25 | $ 0.75 | $ 0.22 | $ 0.93 | |||||||||||||||
| Exercise price per share (in dollars per share) | $ 0.50 | $ 1.20 | |||||||||||||||||
| Expected volatility (as a percent) | 125.00% | 125.00% | 91.60% | ||||||||||||||||
| Risk-free interest rate (as a percent) | 1.05% | 1.05% | 1.35% | ||||||||||||||||
| Floor price (in dollars per share) | $ 0.26 | $ 0.50 | $ 0.50 | ||||||||||||||||
| Remaining expected term of underlying securities | 4 years 2 months 26 days | 4 years 2 months 26 days | 4 years 10 months 24 days | ||||||||||||||||