Goodwill and intangible assets (Details) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jan. 31, 2020 |
Jul. 31, 2019 |
|
| Goodwill and intangible assets (Details) [Line Items] | ||
| Goodwill | $ 7,452 | $ 7,452 |
| Intangible Assets, Amortization Period [Member] | ||
| Goodwill and intangible assets (Details) [Line Items] | ||
| Finite-Lived Intangible Asset, Useful Life | 1 year | |
| Clinical Services [Member] | ||
| Goodwill and intangible assets (Details) [Line Items] | ||
| Goodwill | $ 7,452 | $ 7,452 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
|
| X | ||||||||||
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|