12. Segment Reporting

We view our operations and manage our business as one segment: the development, marketing and licensing of design assets and technologies. Factors used to identify our single segment include the financial information available for evaluation by our chief operating decision maker in making decisions about how to allocate resources and assess performance. While our technologies and services are sold into two principal markets, Creative Professional and OEM, expenses and assets are not formally allocated to these market segments, and operating results are assessed on an aggregate basis to make decisions about the allocation of resources. The following table presents revenue for these two major markets (in thousands):

 

		Three Months Ended March 31,
		2018				2017
Creative Professional		$	34,998			$	27,071
OEM			21,685				25,394
Total		$	56,683			$	52,465

Geographic segment information

We market our products and services principally through offices in the United States, United Kingdom, Germany, China, Republic of Korea and Japan. We report revenue based on the geographic location of our customers. For example, licenses may be sold to large international companies, which may be headquartered in the Republic of Korea, but the sales are received and recorded by our subsidiary located in the United States.

The following table summarizes revenue by customer location (in thousands of dollars, except percentages):

 

		Three Months Ended March 31,
		2018								2017
		Revenue				% of Total				Revenue				% of Total
United States		$	24,823				43.8	%		$	23,597				45.0	%
Japan			11,652				20.5				14,461				27.6
Europe, Middle East, and Africa (EMEA)			15,066				26.6				10,860				20.7
Rest of the World			5,142				9.1				3,547				6.7
Total		$	56,683				100.0	%		$	52,465				100.0	%

Long-lived assets, which include property and equipment, goodwill and intangibles, but exclude other assets, long-term investments and deferred tax assets, are attributed to geographic areas in which Company assets reside and is shown below (in thousands):

 

		March 31, 2018				December 31, 2017
Long-lived assets:
United States		$	313,210			$	314,930
United Kingdom			4,104				4,004
Germany			59,591				58,319
Asia (including Japan)			3,506				3,497
Total		$	380,411			$	380,750