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Income Taxes Income Taxes - Summary of Valuation Allowance (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Valuation Allowance [Abstract]      
Balance at beginning of period $ 38,644us-gaap_DeferredTaxAssetsValuationAllowance $ 34,347us-gaap_DeferredTaxAssetsValuationAllowance $ 28,354us-gaap_DeferredTaxAssetsValuationAllowance
Additions 39,556hlit_ValuationAllowanceDeferredTaxAssetAddition 6,364hlit_ValuationAllowanceDeferredTaxAssetAddition 5,993hlit_ValuationAllowanceDeferredTaxAssetAddition
Deductions (3,001)hlit_ValuationAllowanceDeferredTaxAssetDeductions (2,067)hlit_ValuationAllowanceDeferredTaxAssetDeductions 0hlit_ValuationAllowanceDeferredTaxAssetDeductions
Balance at end of period $ 75,199us-gaap_DeferredTaxAssetsValuationAllowance $ 38,644us-gaap_DeferredTaxAssetsValuationAllowance $ 34,347us-gaap_DeferredTaxAssetsValuationAllowance