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Net Income (Loss) Per Share - Additional Information (Detail) - $ / shares	Dec. 31, 2017	Dec. 31, 2015
Earnings Per Share [Abstract]
Potential Common Shares Upon Notes Conversion If Only Settled In Shares	22,304,348
Debt Instrument, Convertible, Conversion Price	$ 5.75	$ 5.75

X

- Definition

Potential Common Shares Upon Notes Conversion If Only Settled In Shares

+ References

No definition available.

+ Details

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Namespace Prefix:	hlit_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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