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Significant Accounting Policies (Details 2) (USD $)
|
9 Months Ended | 12 Months Ended | 54 Months Ended | 63 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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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, 2012
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Apr. 30, 2013
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Apr. 30, 2013
Research and development expense
Non-employees
|
Apr. 30, 2012
Research and development expense
Non-employees
|
Apr. 30, 2013
Research and development expense
Non-employees
|
Apr. 30, 2012
Research and development expense
Non-employees
|
Jul. 31, 2012
Research and development expense
Non-employees
|
Apr. 30, 2013
General and administrative expense
Non-employees
|
Apr. 30, 2012
General and administrative expense
Non-employees
|
Apr. 30, 2013
General and administrative expense
Non-employees
|
Apr. 30, 2012
General and administrative expense
Non-employees
|
Jul. 31, 2012
General and administrative expense
Non-employees
|
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| Stock options to non-employees | ||||||||||||||||
| Stock-based compensation expense recognized | $ 34,500 | $ 249,000 | $ 249,000 | $ 83,000 | $ 332,000 | $ 366,500 | $ 3,000 | $ 8,000 | $ 9,000 | $ 8,000 | $ 25,000 | $ 62,000 | $ 25,000 | $ 236,000 | $ 25,000 | $ 133,000 |