Segments and Information about Revenues by Geographic Region (Tables)
9 Months Ended
Sep. 30, 2013
Segment Reporting [Abstract]  
Reconciliation of Revenue from Segments to Consolidated
The following table presents our revenues by geographic region of end users who purchased products or services for the periods presented below:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2013
 
2012
 
2013
 
2012
 
(in thousands)
United States and Canada
$
49,887

 
$
27,086

 
$
122,905

 
$
72,338

International
11,192

 
5,040

 
28,076

 
13,589

Total revenues
$
61,079

 
$
32,126

 
$
150,981

 
$
85,927