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Fair Value Measurements (Details) - USD ($) $ in Thousands | Apr. 30, 2018 | Jul. 31, 2017
--- | --- | ---
Available-for-sale securities: |  |  |
Marketable securities |  | $ 10,570 | $ 58,272
Rafael Pharma Series D Note |  |  | 6,300
Total |  |  | 64,572
Fair Value Measurements, Recurring basis [Member] | Level 1 [Member] |  |  |
Available-for-sale securities: |  |  |
Marketable securities | [1] | 1,794 | 12,151
Rafael Pharma Series D Note | [1] |  |
Total | [1] |  | 12,151
Fair Value Measurements, Recurring basis [Member] | Level 2 [Member] |  |  |
Available-for-sale securities: |  |  |
Marketable securities | [2] | 8,776 | 46,121
Rafael Pharma Series D Note | [2] |  |
Total | [2] |  | 46,121
Fair Value Measurements, Recurring basis [Member] | Level 3 [Member] |  |  |
Available-for-sale securities: |  |  |
Marketable securities | [3] |  |
Rafael Pharma Series D Note | [3] |  | 6,300
Total | [3] |  | $ 6,300
[1] | quoted prices in active markets for identical assets or liabilities
[2] | observable inputs other than quoted prices in active markets for identical assets and liabilities
[3] | no observable pricing inputs in the market

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