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Segment Information - Narratives (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2016 USD ($) Customer country	Dec. 31, 2014 segment	Dec. 31, 2017 USD ($) Customer segment country		Dec. 31, 2016 USD ($) Customer country	Dec. 31, 2015 USD ($) Customer country	Feb. 29, 2016
Segment Reporting Information [Line Items]
Number of reportable segments | segment		2	2
Restructuring and Related Cost, Incurred Cost			$ 6,586	[1]	$ 18,002	$ 1,485
Inventory Write-down			$ 6,005		6,871	$ 1,585
Number Of Customers Accounting For More Than Ten Percent of Revenue | Customer			0
Operating Segments [Member] | Cable Edge [Member]
Segment Reporting Information [Line Items]
Inventory Write-down					$ 32,200
Sales Revenue, Net [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage			10.00%
Number Of Customers Accounting For More Than Ten Percent of Revenue | Customer	0		0		0
Number Of Customers Accounting For More Than Ten Percent Of Revenue Other Than Comcast | Customer						0
Comcast [Member] | Sales Revenue, Net [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage						12.00%
Customer concentration risk ten percent or more of net revenue [Member]
Segment Reporting Information [Line Items]
Number Of Customers Accounting For More Than Ten Percent of Revenue	0				0	0
Customer concentration risk ten percent or more of net revenue other than Comcast [Member]
Segment Reporting Information [Line Items]
Number Of Customers Accounting For More Than Ten Percent Of Revenue Other Than Comcast | Customer						0
Customer concentration risk ten percent or more of net revenue other than Comcast [Member] | Sales Revenue, Net [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage						10.00%
Non-US [Member] | Sales Revenue, Net [Member]
Segment Reporting Information [Line Items]
Number Of Countries Accounting For More Than Ten Percent of Non United States Revenue | country	0		0		0	0
Concentration Risk, Percentage			10.00%
TVN Voluntary Departure Plan [Member]
Segment Reporting Information [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 13,100
Harmonic Two Thousand And Sixteen Restructuring [Member] | TVN Voluntary Departure Plan [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Restructuring and Related Cost, Incurred Cost			$ 7,900
Avid Technology Inc. [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Litigation Settlement, Expense			8,000
TVN [Member]
Segment Reporting Information [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired							100.00%
Operating expense [Member] | Change in Accounting Method Accounted for as Change in Estimate [Member]
Segment Reporting Information [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			$ 2,400
[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 discussion below “Harmonic 2016 Restructuring Plan-TVN VDP” for additional information on the gain from TVN pension curtailment.

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