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Derivative Liabilities (Details Textual) (USD $)	3 Months Ended
Derivative Liabilities (Details Textual) (USD $)	Oct. 31, 2012	Oct. 31, 2011	Jul. 31, 2012
Derivative warrant liability fair value	$ (624,797)		$ (1,811,746)
Revaluation Of Warrants [Member]
Derivative, Average Remaining Maturity	3 years 9 months 4 days
Derivative Instruments, Gain Recognized in Income	358,714	3,128,459
Derivative warrant liability fair value	$ 4,347,710		$ 4,081,627

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

The amount of gain recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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