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Significant Customers and Geographic Information (Tables)
 6 Months Ended
Jul. 31, 2017
Geographic Areas Revenues From External Customers [Abstract]  
Revenues by Geographic Area

During the three and six months ended July 31, 2017 and July 31, 2016, revenues by geographic area, based on billing addresses of the customers, were as follows (in thousands):

 

 

 

Three Months Ended

 

 

Six Months Ended

 

 

 

July 31,

 

 

July 31,

 

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

United States

 

$

28,751

 

 

$

21,942

 

 

$

56,062

 

 

$

42,610

 

Foreign countries

 

 

15,800

 

 

 

9,190

 

 

 

29,626

 

 

 

17,705

 

Total revenues

 

$

44,551

 

 

$

31,132

 

 

$

85,688

 

 

$

60,315