Accrued Liabilities, Other Current Liabilities and Other Liabilities (Details) - Accrued liabilities - USD ($) $ in Thousands	Jul. 31, 2016	Jul. 31, 2015
Accrued liabilities [Abstract]
Payroll, benefits, severance and commissions	$ 3,956	$ 3,907
Legal	954	4,183
Professional fees	503	678
Research and development	300	300
Other	2,498	2,229
	$ 8,211	$ 11,297