Private Placements and Public Offering (Details 2) (USD $)
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1 Months Ended | 12 Months Ended | 54 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | ||||||
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Jun. 30, 2011
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Mar. 31, 2011
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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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Mar. 28, 2012
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Jun. 24, 2011
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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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Mar. 28, 2012
Warrants
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Jul. 31, 2012
Warrants issued with March 2011 Private Placement
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Derivative Liabilities | ||||||||||||
Estimated fair value of derivative liabilities | $ 657,604 | $ 3,808,590 | ||||||||||
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 | |||||||||
Adjustments to fair value of derivative liabilities | $ 4,192,781 | $ (1,041,795) | $ 3,150,986 | $ 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 | $ 0.93 | $ 0.22 | ||||||||
Exercise price per share (in dollars per share) | $ 1.20 | $ 0.50 | ||||||||||
Expected volatility (as a percent) | 125.00% | 91.60% | ||||||||||
Risk-free interest rate (as a percent) | 1.05% | 1.35% | ||||||||||
Floor price (in dollars per share) | $ 0.50 | $ 0.50 | ||||||||||
Remaining expected term of underlying securities | 4 years 2 months 26 days | 4 years 10 months 24 days |