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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jul. 31, 2017 | Jul. 31, 2016
--- | --- | ---
Available-for-sale securities: |  |
Marketable securities | $ 58,272 | $ 52,949
Rafael convertible promissory notes | 6,300 | 2,000
Total | 64,572 | 54,949
Fair Value Measurements, Recurring basis [Member] | Level 1 [Member] |  |
Available-for-sale securities: |  |
Marketable securities | 12,151 | 12,445
Rafael convertible promissory notes |  |
Total | 12,151 | 12,445
Fair Value Measurements, Recurring basis [Member] | Level 2 [Member] |  |
Available-for-sale securities: |  |
Marketable securities | 46,121 | 40,504
Rafael convertible promissory notes |  |
Total | 46,121 | 40,504
Fair Value Measurements, Recurring basis [Member] | Level 3 [Member] |  |
Available-for-sale securities: |  |
Marketable securities |  |
Rafael convertible promissory notes | 6,300 | 2,000
Total | $ 6,300 | $ 2,000

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