Business Segment and Geographic Information (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Jul. 31, 2016
Business Segment Information [Line Items]
Long-lived assets, net	$ 2,706	$ 1,966
Total assets	12,487	12,433
United States [Member]
Business Segment Information [Line Items]
Long-lived assets, net	2,462	1,719
Total assets	8,884	8,576
Foreign [Member]
Business Segment Information [Line Items]
Long-lived assets, net	244	247
Total assets	$ 3,603	$ 3,857