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Information about Geographic Areas (Tables)
 6 Months Ended
Jun. 30, 2017
Segment Reporting [Abstract]  
Classification of Revenue by Geography
Revenue by geography was as follows (in thousands):            
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Americas
$
27,341

 
$
16,319

 
$
39,552

 
$
26,404

Europe & Middle East
5,237

 
4,880

 
9,653

 
7,733

Asia Pacific
2,014

 
1,428

 
3,451

 
3,187

Total revenue
$
34,592

 
$
22,627

 
$
52,656

 
$
37,324