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Segment Information (Tables)
 9 Months Ended
Sep. 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
 
Nine Months Ended
 
September 30,
 
September 30,
 
2012
 
2013
 
2012
 
2013
Net revenue:
 
 
 
 
 
 
 
United States
$
47,737

 
$
51,717

 
$
149,169

 
$
146,400

Europe, Middle East and Africa
3

 
—

 
12

 
2

Asia
483

 
886

 
1,348

 
1,364

Total net revenue
$
48,223

 
$
52,603

 
$
150,529

 
$
147,766