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Business Segment and Geographic Information (Details) - USD ($)
$ in Thousands
Jul. 31, 2017
Jul. 31, 2016
Business Segment Information [Line Items]    
Long-lived assets, net $ 2,808 $ 1,966
Total assets 12,531 12,433
United States [Member]    
Business Segment Information [Line Items]    
Long-lived assets, net 2,537 1,719
Total assets 8,910 8,576
Foreign [Member]    
Business Segment Information [Line Items]    
Long-lived assets, net 271 247
Total assets $ 3,621 $ 3,857