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Segment Information (Tables)
6 Months Ended
Jun. 30, 2013
Segment Reporting [Abstract]  
Net revenue by geographic area
Net revenue is recorded in the geographic area in which the sale originated. Information concerning principal geographic areas in which we operate is as follows (in thousands): 
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2012
 
2013
 
2012
 
2013
Net revenue:
 
 
 
 
 
 
 
United States
$
47,346

 
$
50,518

 
$
101,433

 
$
94,682

Europe, Middle East and Africa
4

 
1

 
9

 
2

Asia
358

 
164

 
864

 
479

Total net revenue
$
47,708

 
$
50,683

 
$
102,306

 
$
95,163