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Selected Quarterly Financial Data Selected Quarterly Financial Data - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) Employees | Sep. 30, 2016 USD ($) | Jul. 01, 2016 USD ($) | Apr. 01, 2016 USD ($) | Dec. 31, 2015 USD ($) | Apr. 03, 2015 USD ($) | Dec. 31, 2016 USD ($) Employee | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost |  |  |  |  |  |  | $ 18,002 | [1] | $ 1,485 | $ 3,076
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  |  |  |  | 1,955 |  |  |
Gross Margin Percentage |  | 50.70% | 46.60% | 49.70% | 54.30% |  |  |  |  |
Increase (Decrease) in Deferred Revenue and Customer Advances and Deposits |  |  |  | $ 4,800 |  |  |  |  |  |
Provision for excess and obsolete inventories |  |  |  |  |  |  | 6,871 |  | 1,585 | 2,569
Amortization of intangibles |  |  |  |  |  |  | 14,836 |  | 6,502 | 20,520
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  |  | $ 3,100 |  |  |  |  |
Valuation Allowance Deferred Tax Asset Addition |  |  |  |  |  |  | 18,291 |  | 3,068 | 39,556
Valuation Allowance Deferred Tax Asset Deductions |  |  |  |  |  |  | 8,356 |  | 13,722 | 3,001
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  |  |  |  |  |  | 1,000 |  | 900 | 9,500
Israel Tax Authority [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  |  |  |  |  |  | (900) |
Vislink plc [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Cost-method Investments, Other than Temporary Impairment |  | $ 1,200 |  | 1,500 |  |  |  |  | 0 |
VJU Gmbh [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Cost-method Investments, Other than Temporary Impairment |  |  |  |  |  | $ 2,500 | 2,500 |  |  |
TVN [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition and Integration Related Expenses | $ 5,200 | $ 5,300 | $ 3,400 | $ 3,000 |  |  | 16,900 |  |  |
Number of employees applied for VDP | Employees | 83 |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  |  |  |  | $ 2,000 |  |  |
TVN Voluntary Departure Plan [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Number of employees applied for VDP | Employee |  |  |  |  |  |  | 83 |  |  |
Restructuring and Related Cost |  |  |  |  |  |  | $ 13,100 |  |  |
Harmonic Two Thousand And Sixteen Restructuring [Member] | TVN Voluntary Departure Plan [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost |  |  |  |  |  |  | 13,100 |  |  |
Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of intangibles |  |  |  |  |  |  | 4,434 |  | $ 719 | $ 13,745
Operating Segments [Member] | Cable Edge [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Provision for excess and obsolete inventories |  |  | $ 4,500 |  |  |  | 4,000 |  |  |
Valuation Allowance, Operating Loss Carryforwards [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Valuation Allowance Deferred Tax Asset Addition | $ 18,300 |  |  |  |  |  |  |  |  |
Valuation Allowance, Stock-based Compensation [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Valuation Allowance Deferred Tax Asset Deductions |  |  |  |  |  |  | $ 8,400 |  |  |
[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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