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, 2019 |
Jul. 31, 2018 |
Jul. 31, 2017 |
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| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Share Based Compensation | $ 939 | $ 813 | $ 831 |
| Cost of Clinical Laboratory Services [Member] | |||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Share Based Compensation | 6 | ||
| Selling, General and Administrative Expenses [Member] | |||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | |||
| Share Based Compensation | $ 939 | $ 813 | $ 825 |
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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 Amount of noncash expense for share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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