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Restructuring and Excess Facilities - Restructuring and Asset Impairment Charges COS vs OPEX (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	[1]	Dec. 31, 2016	Dec. 31, 2015
Restructuring and Related Activities [Abstract]
Product cost of revenue	$ 1,279		$ 3,400	$ 113
Operating expenses - Restructuring and related Charges	5,307		14,602	1,372
Restructuring and Related Cost	$ 6,586		$ 18,002	$ 1,485
[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.

X

- Definition

Nonrecurring impairment charges related to the write-off of production-related equipment and inventory. This tag is used when an Entity charges this cost to cost of goods sold.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a))
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No definition available.

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Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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-Subparagraph (SAB Topic 5.P.3)
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