XML 120 R104.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Income Taxes Income Taxes - Summary of Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Valuation Allowance [Abstract] |  |  |
Balance at beginning of period | $ 64,545 | $ 75,199 | $ 38,644
Additions | 18,291 | 3,068 | 39,556
Deductions | (8,356) | (13,722) | (3,001)
Balance at end of period | $ 74,480 | $ 64,545 | $ 75,199

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=65882285&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