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Geographical Information
12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Geographical Information
Geographical Information
The following table is a summary of revenues by geographic region based on client billing address and has been estimated based on the amounts billed to clients during the periods (in thousands).
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
United States
 
$
188,303

 
$
151,484

 
$
120,037

International
 
11,922

 
10,606

 
8,831

Total revenue
 
$
200,225

 
$
162,090

 
$
128,868

The following table summarizes total property and equipment, net in the respective locations (in thousands).
 
 
December 31,
 
 
2017
 
2016
 
2015
United States
 
$
17,949

 
$
13,025

 
$
10,939

International
 
1,939

 
1,663

 
2,286

Property and equipment, net
 
$
19,888

 
$
14,688

 
$
13,225