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Concentration of Customers (Tables)
3 Months Ended
Oct. 31, 2015
Concentration of Customers [Abstract]  
Schedule of revenues from transactions with single customer
  Three Months Ended
October 31,
 
  2015  2014 
  (in thousands) 
Customer 1 $41  $41 
Customer 2  21   24 
Customer 3  15   10