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Revenue | 3 Months Ended
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Mar. 31, 2021
Revenue From Contract With Customer [Abstract] |
Revenue | 3. REVENUE 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. See Note 17 for additional information on reportable segments. Revenue by Category In addition to our reporting segments, revenue is also reported for the following three categories – Access & Aggregation, Subscriber Solutions & Experience and Traditional & Other Products. The following table disaggregates revenue by reportable segment and revenue category:
|  | For the Three Months Ended |
|  | March 31, 2021 |  |  | March 31, 2020 |
(In thousands) |  | Network Solutions |  |  | Services & Support |  |  | Total |  |  | Network Solutions |  |  | Services & Support |  |  | Total |
Access & Aggregation |  | $ | 60,053 |  |  | $ | 9,021 |  |  | $ | 69,074 |  |  | $ | 53,055 |  |  | $ | 12,911 |  |  | $ | 65,966 |
Subscriber Solutions & Experience |  |  | 52,269 |  |  |  | 2,300 |  |  |  | 54,569 |  |  |  | 39,983 |  |  |  | 2,196 |  |  |  | 42,179 |
Traditional & Other Products |  |  | 1,487 |  |  |  | 2,403 |  |  |  | 3,890 |  |  |  | 4,334 |  |  |  | 2,044 |  |  |  | 6,378 |
Total |  | $ | 113,809 |  |  | $ | 13,724 |  |  | $ | 127,533 |  |  | $ | 97,372 |  |  | $ | 17,151 |  |  | $ | 114,523 |
Revenue allocated to remaining performance obligations represents contract revenue that have not yet been recognized for contracts with a duration greater than one year. As of March 31, 2021, 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 we are entitled to invoice which correspond to the value of completed performance obligations to date. The amount related to these performance obligations was $19.0 million and $17.7 million as of March 31, 2021 and December 31, 2020, respectively. The Company expects to recognize 63% of the $19.0 million as of March 31, 2021 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) |  | As of March 31, 2021 |  |  | As of December 31, 2020 |
Accounts receivable, net |  | $ | 103,201 |  |  | $ | 98,827 |
Contract assets(1) |  | $ | 906 |  |  | $ | 63 |
Unearned revenue |  | $ | 14,457 |  |  | $ | 14,092 |
Non-current unearned revenue |  | $ | 7,040 |  |  | $ | 6,888 |
| (1) | Included in other receivables on the Condensed Consolidated Balance Sheets.
Of the outstanding unearned revenue balances as of December 31, 2020, $5.0 million was recognized as revenue during the three months ended March 31, 2021.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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