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Related Party Transactions (Tables)
 9 Months Ended
Oct. 31, 2015
Related Party Transactions [Abstract]  
Revenue recognized from related party
The following table shows revenue recognized from these customers:
 
Three months ended October 31,
 
Nine months ended October 31,
 
2015
 
2014
 
2015
 
2014
Revenues from customers
$
6,902

 
$
10,311

 
$
14,054

 
$
21,466

Percentage of total revenues
2.4
%
 
3.5
%
 
1.7
%
 
2.7
%