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Concentration of Customers (Tables)
9 Months Ended
Apr. 30, 2015
Concentration of Customers [Abstract]  
Scheudle of revenues from transactions with single customer

  Three Months Ended
April 30,
  Nine Months Ended
April 30,
 
  2015  2014  2015  2014 
 (in thousands) 
Customer 1 $41  $41  $124  $124 
Customer 2  21   28   66   87 
Customer 3  10   10   29   29