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Income taxes (Details) (USD $)
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12 Months Ended | 12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|
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Jul. 31, 2013
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Jul. 31, 2012
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Jul. 31, 2013
Domestic Tax Authority [Member]
Minimum [Member]
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Jul. 31, 2013
Domestic Tax Authority [Member]
Maximum [Member]
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Jul. 31, 2013
U.S. Federal Tax [Member]
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Jul. 31, 2013
Minimum [Member]
Research Tax Credit Carryforward [Member]
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Jul. 31, 2013
Minimum [Member]
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Jul. 31, 2013
Maximum [Member]
Research Tax Credit Carryforward [Member]
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Jul. 31, 2013
Maximum [Member]
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| Income taxes (Details) [Line Items] | |||||||||
| Deferred Tax Liabilities, Net | $ 200,000 | $ 938,000 | |||||||
| Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 102,500,000 | ||||||||
| Operating Loss Carryforwards Expiration Year | 2018 | 2033 | |||||||
| Deferred Tax Assets Research and Development and Other Tax Credit Carryforwards | 1,013,000 | 795,000 | 900,000 | ||||||
| Tax Credit Carryforward Expiration Year | 2025 | 2033 | |||||||
| Foreign Loss Carryforwards | 3,700,000 | ||||||||
| Operating Loss Carryforwards On Acquisitions | 700,000 | ||||||||
| Undistributed Earnings of Foreign Subsidiaries | 252,000 | ||||||||
| Liability for Uncertain Tax Position | $ 0 | ||||||||
| Income Tax Examination, Year under Examination | 2010 | 2012 | |||||||
| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from research and development and other tax credit carry forwards. No definition available.
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| X | ||||||||||
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- Definition
Value of foreign loss carry forwards as of the reporting date. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Liability for uncertain tax position. No definition available.
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| X | ||||||||||
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- Definition
Operating loss carryforwards expiration year. No definition available.
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| X | ||||||||||
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- Definition
Amount of operating loss carry forwards on acquisitions. No definition available.
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| X | ||||||||||
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- Definition
Tax credit carryforward expiration year. No definition available.
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| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates. No definition available.
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| X | ||||||||||
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tax year being audited in the income tax examination, in CCYY format. No definition available.
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| X | ||||||||||
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- Definition
Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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