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Revenue

3 Months Ended

Mar. 31, 2019

Revenue From Contract With Customer [Abstract]

3. REVENUE

The following is a description of the principal activities from which we generate our revenue by reportable segment.

Network Solutions Segment

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. The majority of the revenue from this segment is from hardware sales. In certain transactions, we are also the lessor in sales-type lease arrangements for network equipment. These arrangements typically include network equipment, network implementation services and maintenance services. See Note 12 for additional information.

Services & Support Segment

To complement our Network Solutions segment, we offer a complete portfolio of maintenance, network implementation and solutions integration and managed services, which include hosted cloud services and subscription services.

In addition to our reporting segments, we also report revenue in the following three categories – Access & Aggregation, Subscriber Solutions & Experience, and Traditional & Other Products.

The following table disaggregates our revenue by major source for the three months ended March 31, 2019:

(In thousands)	Network Solutions		Services & Support		Total
Access & Aggregation	$	85,673	$	14,105	$	99,778
Subscriber Solutions & Experience⁽¹⁾		34,719		2,034		36,753
Traditional & Other Products		5,430		1,830		7,260
Total	$	125,822	$	17,969	$	143,791

⁽¹⁾

^{Subscriber Solutions & Experience was formerly reported as Customer Devices. With the increasing focus on enhancing the customer experience for both our business and consumer broadband customers and the addition of SmartRG during the fourth quarter of 2018, Subscriber Solutions & Experience more accurately represents this revenue category.}

The following table disaggregates our revenue by major source for the three months ended March 31, 2018:

(In thousands)	Network Solutions		Services & Support		Total
Access & Aggregation	$	69,385	$	12,295	$	81,680
Subscriber Solutions & Experience⁽¹⁾		28,777		1,324		30,101
Traditional & Other Products		7,091		1,934		9,025
Total	$	105,253	$	15,553	$	120,806

⁽¹⁾

As of March 31, 2019, we did not have any significant performance obligations related to customer contracts that had an original expected duration of one year or more, other than maintenance services, which are satisfied over time.

The following table provides information about receivables, contract assets and unearned revenue from contracts with customers:

(In thousands)	March 31, 2019		December 31, 2018
Accounts receivable, net	$	99,032	$	99,385
Contract assets	$	2,333	$	3,766
Unearned revenue	$	15,230	$	17,940
Non-current unearned revenue	$	4,514	$	5,296

$6.9 million of the outstanding unearned revenue balance at December 31, 2018 was recognized as revenue during the three months ended March 31, 2019.