Income Taxes (Details 1) - USD ($) $ in Thousands	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Deferred income tax assets (liabilities):
Net operating loss carryforward	$ 57,098	$ 53,383
Accrued expenses	338	314
Stock based compensation	(464)	(329)
Deferred revenue on litigation settlements		313
Valuation allowance	(56,972)	(53,681)	$ (50,191)	$ (50,797)
TOTAL NET DEFERRED INCOME TAX ASSETS (LIABILITIES)