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Segment and Geographic Information (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Summary of Revenue By Geography
The following table summarizes revenue by geography for the three and nine months ended September 30, 2017 and 2016 (in thousands): 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Domestic
$
31,878

 
$
23,650

 
$
93,860

 
$
80,715

International
12,770

 
7,095

 
32,315

 
18,461

Total
$
44,648

 
$
30,745

 
$
126,175

 
$
99,176