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Business Segment and Geographic Information (Details) - USD ($)
$ in Thousands
Apr. 30, 2018
Jul. 31, 2017
Business Segment Information [Line Items]    
Long-lived assets, net $ 3,402 $ 2,808
Total assets 12,558 12,531
United States [Member]    
Business Segment Information [Line Items]    
Long-lived assets, net 3,163 2,537
Total assets 8,049 8,910
Foreign [Member]    
Business Segment Information [Line Items]    
Long-lived assets, net 239 271
Total assets $ 4,509 $ 3,621