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Related Party Transactions (Tables)
 6 Months Ended
Jul. 31, 2015
Related Party Transactions [Abstract]  
Revenue recognized from related party
The following table shows revenue recognized from these customers:
 
Three months ended July 31,
 
Six months ended July 31,
 
2015
 
2014
 
2015
 
2014
Revenues from customers
$
4,086

 
$
5,105

 
$
7,152

 
$
11,155

Percentage of total revenues
1.5
%
 
2.0
%
 
1.3
%
 
2.2
%