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Income Taxes Income Taxes - Summary of Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation Allowance [Abstract]
Balance at beginning of period	$ 74,480	$ 64,545	$ 75,199
Additions	9,028	18,291	3,068
Deductions	(5,752)	(8,356)	(13,722)
Balance at end of period	$ 77,756	$ 74,480	$ 64,545

X

- Definition

Valuation allowance deferred tax asset additions.

+ References

No definition available.

+ Details

Name:	hlit_ValuationAllowanceDeferredTaxAssetAddition
Namespace Prefix:	hlit_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Valuation allowance deferred tax asset deductions.

+ References

No definition available.

+ Details

Name:	hlit_ValuationAllowanceDeferredTaxAssetDeductions
Namespace Prefix:	hlit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_ValuationAllowanceAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration