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Investment in Rafael Pharmaceuticals, Inc. (Tables) | 12 Months Ended
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Jul. 31, 2017
Investment in Rafael Pharmaceuticals, Inc. [Abstract] |
Schedule of consolidated balance sheets |
July 31 (in thousands) |  | 2017 |  |  | 2016 |
Convertible promissory note (at fair value) |  | $ | 6,300 |  |  | $ | 2,000 |
Warrants (at cost) |  |  | 5,400 |  |  |  | — |
Right to receive additional shares (at cost) |  |  | 400 |  |  |  | — |
Total investment in Rafael |  | $ | 12,100 |  |  | $ | 2,000 |

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