The Company operates an electronic platform for the trading of fixed-income securities and provides related data, analytics, compliance tools and post-trade services. The Company considers its operations to constitute a single business segment because of the highly integrated nature of these product and services, the financial markets in which the Company competes and 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 nine months ended September 30, 2019 and 2018, 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 of the Company. Revenues and long-lived assets are attributed to a 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 and nine months ended September 30, 2019 and 2018 and long-lived assets as of September 30, 2019 and December 31, 2018 was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
	(In thousands)
Revenues
United States	$	109,526	$	85,110	$	317,282	$	271,833
United Kingdom		21,417		15,882		62,390		49,828
Other		654		451		1,906		1,460
Total	$	131,597	$	101,443	$	381,578	$	323,121

	As of
	September 30, 2019		December 31, 2018
	(In thousands)
Long-lived assets, as defined
United States	$	59,146	$	55,200
United Kingdom		7,355		7,787
Other		30		23
Total	$	66,531	$	63,010