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Segment and Geographic Information
12 Months Ended
Dec. 31, 2015
Segment Reporting [Abstract]  
Segment and Geographic Information
Segment and Geographic Information
Revenue by country is based on the billing address of the seller. The following table summarizes revenue by geographic area (in thousands):
 
 
Year Ended 
 December 31,
 
2013
 
2014
 
2015
United States
$
103,428

 
$
153,866

 
$
213,389

International
21,594

 
41,725

 
60,110

Revenue
$
125,022

 
$
195,591

 
$
273,499


No individual international country’s revenue exceeded 5% of total revenue. All significant long-lived assets are located in the United States.