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Concentration of Customers (Tables)
6 Months Ended
Jan. 31, 2016
Concentration of Customers [Abstract]  
Schedule of revenues from transactions with single customer
  Three Months Ended
January 31,
  Six Months Ended
January 31,
 
  2016  2015  2016  2015 
  (in thousands) 
Customer 1 $41  $41  $83  $83 
Customer 2  21   21   43   45 
Customer 3  15   10   29   20