Income taxes (Details) - Components of loss before income taxes - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
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Jul. 31, 2015 |
Apr. 30, 2015 |
Jan. 31, 2015 |
Oct. 31, 2014 |
Jul. 31, 2014 |
Apr. 30, 2014 |
Jan. 31, 2014 |
Oct. 31, 2013 |
Jul. 31, 2015 |
Jul. 31, 2014 |
Jul. 31, 2013 |
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| Income taxes (Details) - Components of loss before income taxes [Line Items] | |||||||||||
| Loss before taxes | $ 8,523 | $ (3,003) | $ (4,206) | $ (3,606) | $ (3,162) | $ (448) | $ (3,570) | $ (2,725) | $ (2,292) | $ (9,905) | $ (18,949) |
| Domestic Tax Authority [Member] | |||||||||||
| Income taxes (Details) - Components of loss before income taxes [Line Items] | |||||||||||
| Loss before taxes | (615) | (8,702) | (15,419) | ||||||||
| Foreign Tax Authority [Member] | |||||||||||
| Income taxes (Details) - Components of loss before income taxes [Line Items] | |||||||||||
| Loss before taxes | $ (1,677) | $ (1,203) | $ (3,530) | ||||||||
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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