Segment and Geographic Information

12 Months Ended

Dec. 31, 2019

Operating segments are defined as components of an enterprise for which discrete financial information is available that is evaluated regularly by the chief operating decision maker, or CODM, for purposes of allocating resources and evaluating financial performance. The Company's CODM reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. As such, the Company's operations constitute a single operating segment and one reportable segment.

Substantially all assets were held in the United States during the years ended December 31, 2019 and 2018. The following table summarizes revenue by geography for the years ended December 31, 2019, 2018 and 2017 (in thousands):



	2019		2018		2017
Revenue by geography:
Domestic	$	97,162	$	99,901	$	95,722
International	32,797		31,317		26,813
Total	$	129,959	$	131,218	$	122,535

The Company's revenue from external customers based in the United Kingdom totaled $13.0 million, $12.3 million and $11.7 million for the years ended December 31, 2019, 2018 and 2017, respectively.