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Information about Geographic Areas (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Classification of Revenue by Geography
Revenue by geography was as follows (in thousands):            
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Americas
$
20,060

 
$
16,784

 
$
59,612

 
$
43,188

Europe & Middle East
4,911

 
4,934

 
14,564

 
12,667

Asia Pacific
2,045

 
2,215

 
5,496

 
5,402

Total revenue
$
27,016

 
$
23,933

 
$
79,672

 
$
61,257