Stockholders' Equity (Details) - Schedule of share-based compensation expense by line item (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share Based Payment Arrangement	$ 103	$ 142
Cost of Clinical Laboratory Services [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share Based Payment Arrangement	2	2
Research and Development Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share Based Payment Arrangement	1	1
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share Based Payment Arrangement	$ 100	$ 139