12. SEGMENT INFORMATION

We operate in two principal segments – contract research services and research products. Our Services segment provides research and development support on a contract basis directly to pharmaceutical companies. Because Seventh Wave and Smithers Avanza are consulting-based contract research laboratories whose core business involves providing integrated services for discovery and preclinical drug development, we consider them part of our Services segment. As such, the financial results are shown in the Services segment data below. Our Products segment provides liquid chromatography, electrochemical and physiological monitoring products to pharmaceutical companies, universities, government research centers, and medical research institutions. We evaluate performance and allocate resources based on these segments. Certain of our assets are not directly attributable to the Services or Products segments. These assets are grouped into the Corporate segment and include cash and cash equivalents, deferred income taxes, refundable income taxes, debt issue costs and certain other assets. We do not allocate such items to the principal segments because they are not used to evaluate their financial position. The accounting policies of these segments are the same as those described in the summary of significant accounting policies.

(a) Operating Segments


	Years Ended September 30,
	2019		2018
Revenue:
Services	$	39,048	$	22,440
Products		4,568		3,906
	$	43,616	$	26,346
Operating income (loss):
Services	$	5,579	$	3,306
Products		(95)		(280)
Corporate		(5,636)		(3,573)
	$	(153)	$	14

Interest Expense		(642)		(274)
Other income		9		6
Income (loss) before income taxes	$	(786)	$	(254)


	Years Ended September 30,					Years Ended September 30,
	2019		2018			2019		2018
Identifiable assets:					Depreciation and amortization:
Services	$	35,122	$	24,514	Services	$	2,017	$	1,204
Products		3,596		3,469	Products		19		21
Corporate		3,262		3,285	Corporate		681		650
	$	41,980	$	31,268		$	2,717	$	1,875

Goodwill, net:					Capital expenditures:
Services	$	3,617	$	3,072	Services	$	5,936	$	1,021
Products		—		—	Products		29		9
Corporate		—		—	Corporate		913		287
	$	3,617	$	3,072		$	6,878	$	1,317

(b) Geographic Information


	Years Ended
	September 30,
	2019		2018
Sales to External Customers:
United States	$	39,634	$	22,290
Other North America		218		163
Pacific Rim		2,407		3,073
Europe		1,217		670
Other		140		150
	$	43,616	$	26,346

Long-lived Assets:
United States	$	29,484	$	23,136
	$	29,484	$	23,136

In fiscal 2019, our Services group continued its presence at several important existing clients. In fiscal 2019, one client accounted for approximately 6.7% of total sales and 8.0% of total trade accounts receivable at September 30, 2019. In fiscal 2018, this client accounted for approximately 11.2% of total sales and 4.0% of total trade accounts receivable at September 30, 2018. The client discussed is included in our Services segment. There can be no assurance that our business will move away from dependence upon a limited number of client relationships.