The Company operates an electronic multi-party platform for the trading of fixed-income securities and provides related data, analytics, compliance tools and post-trade services. The Company’s operations constitute a single business segment because of the highly integrated nature of these products and services, of the financial markets in which the Company competes and of the Company’s worldwide business activities. The Company believes that results by geographic region or client sector are not necessarily meaningful in understanding its business.

For the years ended December 31, 2019, 2018 and 2017, the U.K. was the only individual foreign country in which the Company had a subsidiary that accounted for 10% or more of the total revenues or total long-lived assets. Revenues and long-lived assets are attributed to geographic area based on the location of the particular subsidiary. Long-lived assets are defined as furniture, equipment, leasehold improvements and capitalized software. Information regarding revenue for the three years ended December 31, 2019, 2018 and 2017 and long-lived assets as of December 31, 2019 and 2018 follows:

	Year Ended December 31,
	2019		2018		2017
	(In thousands)
Revenues
United States	$	424,731	$	367,373	$	332,982
United Kingdom		84,076		66,241		58,991
Other		2,545		1,951		1,449
Total	$	511,352	$	435,565	$	393,422

	As of December 31,
	2019		2018
	(In thousands)
Long-lived assets, as defined
United States	$	62,356	$	55,200
United Kingdom		9,410		7,787
Other		29		23
Total	$	71,795	$	63,010