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Concentration of Customers (Tables)
6 Months Ended
Jan. 31, 2015
Concentration of Customers [Abstract]  
Scheudle of revenues from transactions with single customer

  Three Months Ended
January 31,
  Six Months Ended
January 31,
 
  2015  2014  2015  2014 
  (in thousands) 
Customer 1 $41  $42  $83  $83 
Customer 2  21   35   45   59 
Customer 3  10  na   20  na