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Revenue Narratives (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Contract with Customer, Liability, Revenue Recognized | $ 41.1 | $ 46.9
Capitalized Contract Cost, Net | 2.0 |
Capitalized Contract Cost, Amortization | $ 1.5 |
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 | $ 102.5 |
Comcast CableOS Software License Agreement [Member] | Minimum [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 3 years |
Comcast CableOS Software License Agreement [Member] | Maximum [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 4 years |
Significant Financing Component Revenue with Customer [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Revenue, Remaining Performance Obligation, Optional Exemption, Remaining Duration | 1 year |
Prepaid Expenses and Other Current Assets [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Capitalized Contract Cost, Net | $ 1.3 |
Other Noncurrent Assets [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Capitalized Contract Cost, Net | $ 0.7 |

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- 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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