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Business Segment and Geographic Information (Tables)
9 Months Ended
Apr. 30, 2018
Business Segment and Geographic Information [Abstract]  
Schedule of net long-lived assets and total assets by geographic areas
    United States     Foreign     Total  
    (in thousands)  
Long-lived assets, net:                  
April 30, 2018   $ 3,163     $ 239     $ 3,402  
July 31, 2017   $ 2,537     $ 271     $ 2,808  
                         
Total assets:                        
April 30, 2018   $ 8,049     $ 4,509     $ 12,558  
July 31, 2017   $ 8,910     $ 3,621     $ 12,531