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Information about Geographic Areas (Tables)
6 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Product revenue by geography based on billing address of customers The following table presents the total revenue by geographic area of our customers for each period presented (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
United States
$
12,042

 
$
11,674

 
$
22,158

 
$
23,505

Europe
9,109

 
7,748

 
17,582

 
15,384

Asia-Pacific
4,799

 
3,866

 
10,740

 
8,853

Other
478

 
624

 
1,196

 
1,703

Total revenue
$
26,428

 
$
23,912

 
$
51,676

 
$
49,445