Summary of significant accounting policies (Details) - Amount of expense related to share-based payment arrangements - USD ($) $ in Thousands |
12 Months Ended | ||
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Jul. 31, 2017 |
Jul. 31, 2016 |
Jul. 31, 2015 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||
| Share Based Compensation | $ 831 | $ 525 | $ 429 |
| Cost of Clinical Laboratory Services [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||
| Share Based Compensation | 6 | 6 | 5 |
| Research and Development Expense [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||
| Share Based Compensation | 2 | ||
| Selling, General and Administrative Expenses [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||
| Share Based Compensation | $ 825 | $ 519 | $ 422 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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