The following is a description of the principal activities from which revenue is generated by reportable segment:

Network Solutions Segment - 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 Segment - Includes maintenance, network implementation, solutions integration and managed services, which include hosted cloud services and subscription services.

In addition to our reportable segments, revenue is also reported for the following three categories – Access & Aggregation, Subscriber Solutions & Experience and Traditional & Other Products.

The following tables disaggregate revenue by reportable segment and revenue category for the three and six months ended June 30, 2020 and 2019:

	Three Months Ended
	June 30, 2020						June 30, 2019
(In thousands)	Network Solutions		Services & Support		Total		Network Solutions		Services & Support		Total
Access & Aggregation	$	69,721	$	13,055	$	82,776	$	96,262	$	13,159	$	109,421
Subscriber Solutions & Experience		38,081		2,312		40,393		38,444		2,058		40,502
Traditional & Other Products		3,521		2,025		5,546		4,461		2,007		6,468
Total	$	111,323	$	17,392	$	128,715	$	139,167	$	17,224	$	156,391

	Six Months Ended
	June 30, 2020						June 30, 2019
(In thousands)	Network Solutions		Services & Support		Total		Network Solutions		Services & Support		Total
Access & Aggregation	$	122,776	$	25,966	$	148,742	$	181,935	$	27,264	$	209,199
Subscriber Solutions & Experience		78,064		4,508		82,572		73,163		4,092		77,255
Traditional & Other Products		7,855		4,069		11,924		9,891		3,837		13,728
Total	$	208,695	$	34,543	$	243,238	$	264,989	$	35,193	$	300,182

Revenue allocated to remaining performance obligations represents contract revenues that have not yet been recognized for contracts with a duration of greater than one year. As of June 30, 2020, 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. As a practical expedient, for certain contracts we recognize revenue equal to the amounts that we are entitled to invoice, which correspond to the value of completed performance obligations to date. The amount related to these performance obligations was $16.0 million and $13.6 million as of June 30, 2020 and December 31, 2019, respectively. The Company expects to recognize 62% of the $16.0 million as of June 30, 2020 over the next 12 months, with the remainder to be recognized thereafter.

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

(In thousands)	June 30, 2020		December 31, 2019
Accounts receivable, net	$	95,335	$	90,531
Contract assets⁽¹⁾	$	1,028	$	2,812
Unearned revenue	$	12,090	$	11,963
Non-current unearned revenue	$	6,166	$	6,012

Of the outstanding unearned revenue balances as of December 31, 2019 and December 31, 2018, $2.4 million and $3.6 million were recognized as revenue during the three months ended June 30, 2020 and 2019, respectively, and $8.1 million and $10.5 million were recognized as revenue during the six months ended June 30, 2020 and 2019, respectively.