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Segment Information - Narratives (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) Customer | Sep. 30, 2016 USD ($) | Jul. 01, 2016 USD ($) | Apr. 01, 2016 USD ($) | Dec. 31, 2014 Customer segment | Dec. 31, 2016 USD ($) Customer segment | Dec. 31, 2015 USD ($) Customer | Dec. 31, 2014 USD ($) Customer | Feb. 29, 2016
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  | 2 | 2 |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  | 100.00%
Restructuring and Related Cost |  |  |  |  |  | $ 18,002 | [1] | $ 1,485 | $ 3,076 |
Provision for excess and obsolete inventories |  |  |  |  |  | $ 6,871 |  | $ 1,585 | $ 2,569 |
Number Of Customers Accounting For More Than Ten Percent of Revenue | Customer | 0 |  |  |  |  | 0 |  |  |  |
TVN Voluntary Departure Plan [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost |  |  |  |  |  | $ 13,100 |  |  |  |
Customer concentration risk ten percent or more of net revenue [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  | 0.00% |  |  |  |
Number Of Customers Accounting For More Than Ten Percent Of Revenue Other Than Comcast |  |  |  |  | 0 |  |  | 0 | 0 |
Net Revenue [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  | 10.00% |  | 10.00% |  |
Number Of Customers Accounting For More Than Ten Percent Of Revenue Other Than Comcast | Customer | 0 |  |  |  | 0 | 0 |  | 0 | 0 |
Net Revenue [Member] | Comcast [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  | 12.00% | 16.00% |
Cable Edge [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Provision for excess and obsolete inventories |  |  | $ 4,500 |  |  | $ 4,000 |  |  |  |
Harmonic Two Thousand And Sixteen Restructuring [Member] | TVN Voluntary Departure Plan [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost |  |  |  |  |  | $ 13,100 |  |  |  |
UNITED STATES | Net Revenue [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Number Of Countries Accounting For More Than Ten Percent of Non United States Revenue | 0 |  |  |  |  | 0 |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  | 10.00% |  |  |  |
TVN [Member] |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  | 100.00%
Business Combination, Acquisition and Integration Related Expenses | $ 5,200 | $ 5,300 | $ 3,400 | $ 3,000 |  | $ 16,900 |  |  |  |
[1] | The restructuring and related charges for the year ended December 31, 2016 is net of $0.6 million and $1.4 million, in product cost of revenue and operating expenses-restructuring and related charges, respectively, of gain from TVN pension curtailment. See Note 13, “Employee Benefit Plans and Stock-based Compensation-TVN Retirement Benefit Plan,” for additional information on gain from TVN pension curtailment.

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