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Segment information Segment information (Tables)
3 Months Ended
Mar. 31, 2019
Segment Reporting [Abstract]  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas
For the three months ended March 31, 2019 and 2018, revenue by geographic area was as follows:
 
 
Three Months Ended March 31,
(In thousands)
 
2019
 
2018
United States
 
$
58,654

 
$
52,317

International
 
7,907

 
3,672

Revenue
 
$
66,561

 
$
55,989