Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Cash, Cash Equivalents and Restricted Cash [Abstract]
Cash and cash equivalents	$ 13,029	$ 9,902
Restricted cash	314	259
Total cash, cash equivalents and restricted cash	13,343	10,161	$ 8,703	$ 6,889
Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Short-term investments	$ 200	$ 300