Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details) - Schedule of share-based compensation expense by line item

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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