We operate in two reportable segments: (1) Network Solutions and (2) Services & Support. Network Solutions includes hardware products and software defined next-generation virtualized solutions used in service provider or business networks, as well as prior-generation products. Services & Support includes our suite of ProCloud managed services, network installation, engineering and maintenance services and fee-based technical support and equipment repair/replacement plans.

We evaluate the performance of our segments based on gross profit; therefore, selling, general and administrative expenses, research and development expenses, interest and dividend income, interest expense, net investment gain (loss), other income (expense) and (provision) benefit for income taxes are reported on a company-wide, functional basis only. There is no inter-segment revenue.

The following table presents information about the sales and gross profit of our reportable segments for the three and nine months ended September 30, 2019 and 2018. We do not produce asset information by reportable segment; therefore, it is not reported.

	Three Months Ended
	September 30, 2019				September 30, 2018
(In thousands)	Sales		Gross Profit		Sales		Gross Profit
Network Solutions	$	94,018	$	37,574	$	121,043	$	51,100
Services & Support		20,074		8,757		19,292		7,348
Total	$	114,092	$	46,331	$	140,335	$	58,448

	Nine Months Ended
	September 30, 2019				September 30, 2018
(In thousands)	Sales		Gross Profit		Sales		Gross Profit
Network Solutions	$	359,007	$	151,654	$	341,359	$	133,175
Services & Support		55,267		20,304		47,830		15,002
Total	$	414,274	$	171,958	$	389,189	$	148,177

In addition to our reporting segments, we also report revenue for the following three categories – Access & Aggregation, Subscriber Solutions & Experience (formerly Customer Devices) and Traditional & Other Products.

The table below presents sales information by category for the three and nine months ended September 30, 2019 and 2018:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In thousands)	2019		2018		2019		2018
Access & Aggregation	$	65,114	$	91,901	$	274,313	$	258,323
Subscriber Solutions & Experience		42,476		38,552		119,731		103,213
Traditional & Other Products		6,502		9,882		20,230		27,653
Total	$	114,092	$	140,335	$	414,274	$	389,189

The following table represents sales information by geographic area for the three and nine months ended September 30, 2019 and 2018:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In thousands)	2019		2018		2019		2018
United States	$	83,144	$	83,730	$	230,960	$	214,039
International		30,948		56,605		183,314		175,150
Total	$	114,092	$	140,335	$	414,274	$	389,189