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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jul. 31, 2018
Jul. 31, 2017
Available-for-sale securities:    
Marketable securities $ 5,972 $ 58,272
Rafael convertible promissory notes   6,300
Total   64,572
Fair Value Measurements, Recurring basis [Member] | Level 1 [Member]    
Available-for-sale securities:    
Marketable securities 2,052 12,151
Rafael convertible promissory notes  
Total   12,151
Fair Value Measurements, Recurring basis [Member] | Level 2 [Member]    
Available-for-sale securities:    
Marketable securities 3,920 46,121
Rafael convertible promissory notes  
Total   46,121
Fair Value Measurements, Recurring basis [Member] | Level 3 [Member]    
Available-for-sale securities:    
Marketable securities
Rafael convertible promissory notes   6,300
Total   $ 6,300