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Information about Geographic Areas (Tables)
 6 Months Ended
Jun. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
Americas
$
17,005

 
$
27,341

 
$
32,833

 
$
39,552

Europe & Middle East
6,392

 
5,237

 
12,150

 
9,653

Asia Pacific
1,602

 
2,014

 
3,101

 
3,451

Total revenue
$
24,999

 
$
34,592

 
$
48,084

 
$
52,656