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Segment Information and Information about Geographic Area (Tables)
9 Months Ended
Sep. 30, 2013
Segment Reporting [Abstract]  
Revenues by geographic area
Revenues by geographic area, based on the location of the customer, are as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2013
 
2012
 
2013
 
2012
 
(in thousands)
United States
$
19,943

 
$
16,063

 
$
55,750

 
$
45,644

Other
7,806

 
7,319

 
23,173

 
21,119

Total revenues
$
27,749

 
$
23,382

 
$
78,923

 
$
66,763