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Revenue Narratives (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |
Contract with Customer, Liability, Revenue Recognized | $ 36.2 | $ 41.1 |
Capitalized Contract Cost, Amortization | $ 1.6 | $ 1.5 | $ 1.3
Revenue, Practical Expedient, Incremental Cost of Obtaining Contract [true false] | true |  |
Revenue, Practical Expedient, Financing Component [true false] | true |  |
Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation [true false] | true |  |
Maximum [Member] |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |
Capitalized Contract Cost, Amortization Period | 1 year |  |
Revenue, Remaining Performance Obligation, Optional Exemption, Remaining Duration | 1 year |  |
Support and Maintenance Contracts [Member] | Maximum [Member] |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Optional Exemption, Remaining Duration | 1 year |  |
Comcast CableOS Software License Agreement [Member] |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Amount | $ 77.6 |  |
Significant Financing Component Revenue with Customer [Member] | Maximum [Member] |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Optional Exemption, Remaining Duration | 1 year |  |

X
- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054 + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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