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Segment and Geographic Information
 12 Months Ended
Dec. 31, 2019
Segment Reporting [Abstract]  
Segment and Geographic Information Segment and Geographic Information
The following table summarizes revenue by geography for the years ended December 31 (in thousands): 
 201920182017
Domestic$176,187  $161,716  $128,997  
International84,165  65,027  47,740  
Total$260,352  $226,743  $176,737  
With respect to geographic information, revenue is attributed to respective geographies based on the contracting address of the customer. Revenue from external customers attributed to the United Kingdom were 12.2% of our total revenue for the year ended December 31, 2019. There were no individual foreign countries from which more than 10% of our total revenue was attributable for the years ended December 31, 2018 and 2017. Substantially all of our long-lived assets were held in the United States as of December 31, 2019 and December 31, 2018.