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Business Segment and Geographic Information (Tables)
12 Months Ended
Jul. 31, 2017
Business Segment and Geographic Information [Abstract]  
Schedule of net long-lived assets and total assets by geographic areas
 
(in thousands)   United States     Foreign     Total  
Long-lived assets, net:                  
July 31, 2017   $ 2,537     $ 271     $ 2,808  
July 31, 2016     1,719       247       1,966  
Total assets:                        
July 31, 2017   $ 8,910     $ 3,621     $ 12,531  
July 31, 2016     8,576       3,857       12,433