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Related Party Transactions (Tables)
 9 Months Ended
Oct. 31, 2013
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,
 
2013
 
2012
 
2013
 
2012
Revenues from customers
$
13,945

 
$
7,377

 
$
50,282

 
$
38,651

Percentage of total revenues
5.1
%
 
2.7
%
 
6.7
%
 
5.1
%