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Net loss per share (Details)
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3 Months Ended | 6 Months Ended | ||
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Jan. 31, 2014
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Jan. 31, 2013
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Jan. 31, 2014
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Jan. 31, 2013
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Unvested Restricted Stock [Member]
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| Net loss per share (Details) [Line Items] | ||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 23,000 | 22,000 | 24,000 |
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Outstanding Options [Member]
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| Net loss per share (Details) [Line Items] | ||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 1,341,000 | 780,000 | 1,032,000 | 733,000 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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