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Acquisition Obligation (Details) (USD $)
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3 Months Ended | 9 Months Ended | 12 Months Ended | 54 Months Ended | 63 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | ||||||||||
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Apr. 30, 2013
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Apr. 30, 2012
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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, 2012
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Apr. 30, 2013
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Mar. 28, 2012
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Mar. 24, 2012
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Jun. 24, 2011
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Mar. 31, 2012
First Amendment
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Sep. 30, 2011
First Amendment
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Sep. 28, 2011
First Amendment
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Mar. 31, 2012
Second Amendment
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Mar. 24, 2012
Second Amendment
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Sep. 30, 2011
September 2011
First Amendment
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Sep. 28, 2011
September 2011
First Amendment
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Mar. 24, 2012
March 2012
Second Amendment
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| Acquisition obligation | ||||||||||||||||||
| Acquisition obligation, portion modified by amendment | $ 750,000 | $ 1,150,000 | ||||||||||||||||
| Acquisition obligation payment rescheduled to end of month when due | 100,000 | 150,000 | ||||||||||||||||
| Acquisition obligation payment rescheduled later date | 650,000 | 1,000,000 | ||||||||||||||||
| Number of days following the receipt of $5,000,000 when scheduled acquisition obligation payment will be due | 30 days | |||||||||||||||||
| Net proceeds from financings amount that will trigger payment of remaining balance within 30 days | 5,000,000 | |||||||||||||||||
| Class Of Warrant (in shares) | 31,000,000 | 12,000,000 | 1,000,000 | 3,000,000 | ||||||||||||||
| Incremental borrowing rate used to discount acquisition obligation (as a percent) | 5.00% | 5.00% | ||||||||||||||||
| Imputed interest discount | 174,000 | 174,000 | 132,000 | 145,000 | ||||||||||||||
| Non-cash interest expense due to amendments | 19,000 | 35,000 | 71,000 | 121,000 | 152,000 | |||||||||||||
| Non-cash interest expense, amortization of discount | 39,000 | 115,000 | 115,000 | 113,000 | ||||||||||||||
| Short-term imputed interest discounts | 33,000 | 33,000 | 83,000 | 83,000 | 33,000 | |||||||||||||
| Long-term imputed interest discounts | 21,000 | 21,000 | ||||||||||||||||
| Loss on extinguishment of debt | 761,492 | 761,492 | 761,492 | 761,492 | 761,492 | 761,492 | ||||||||||||
| Fair value of acquisition obligation | $ 2,504,178 | |||||||||||||||||