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Investments in Other Equity Securities (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 02, 2014
Sep. 26, 2014
Oct. 22, 2014
Schedule of Cost-method Investments [Line Items]          
Prepayment for Future Software License Purchases $ 9,713,000us-gaap_OtherPrepaidExpenseCurrent $ 10,823,000us-gaap_OtherPrepaidExpenseCurrent      
Cost Method Investments, Carrying Value 8,618,000us-gaap_CostMethodInvestments 0us-gaap_CostMethodInvestments      
Vislink plc [Member]          
Schedule of Cost-method Investments [Line Items]          
Cost Method Investments, Carrying Value 2,600,000us-gaap_CostMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember		        
Unrealized (Loss) on Cost Method Investments, 700,000us-gaap_UnrealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember		        
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 3,300,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember		        
Noncontrolling Interest, Ownership Percentage by Parent     3.30%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember		    
VJU Gmbh [Member]          
Schedule of Cost-method Investments [Line Items]          
Cost Method Investments, Original Cost       2,500,000us-gaap_CostMethodInvestmentsOriginalCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VJUGmbhMember		  
Noncontrolling Interest, Ownership Percentage by Parent       19.80%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VJUGmbhMember		  
EDC [Member]          
Schedule of Cost-method Investments [Line Items]          
Cost Method Investments, Original Cost         3,500,000us-gaap_CostMethodInvestmentsOriginalCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_EDCMember
Noncontrolling Interest, Ownership Percentage by Parent         18.40%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_EDCMember
Variable Interest Entity, Not Primary Beneficiary [Member]          
Schedule of Cost-method Investments [Line Items]          
Cost Method Investments, Carrying Value 6,012,000us-gaap_CostMethodInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		        
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 6,112,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 [1]        
Variable Interest Entity, Not Primary Beneficiary [Member] | VJU Gmbh [Member]          
Schedule of Cost-method Investments [Line Items]          
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 2,605,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VJUGmbhMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 [1],[2]        
Variable Interest Entity, Not Primary Beneficiary [Member] | EDC [Member]          
Schedule of Cost-method Investments [Line Items]          
Cost Method Investments, Carrying Value 3,507,000us-gaap_CostMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_EDCMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		        
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 3,507,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_EDCMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 [1]        
Other Assets [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | VJU Gmbh [Member]          
Schedule of Cost-method Investments [Line Items]          
Cost Method Investments, Carrying Value 2,500,000us-gaap_CostMethodInvestments
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VJUGmbhMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		        
Other Assets [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | EDC [Member]          
Schedule of Cost-method Investments [Line Items]          
Cost Method Investments, Carrying Value 3,500,000us-gaap_CostMethodInvestments
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_EDCMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		        
Cost-method Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | VJU Gmbh [Member]          
Schedule of Cost-method Investments [Line Items]          
Cost Method Investments, Carrying Value 2,505,000us-gaap_CostMethodInvestments
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_CostmethodInvestmentsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VJUGmbhMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 [2]        
Prepaid Expenses and Other Current Assets [Member] | Vislink plc [Member]          
Schedule of Cost-method Investments [Line Items]          
Prepayment for Future Software License Purchases 1,200,000us-gaap_OtherPrepaidExpenseCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember		   3,300,000us-gaap_OtherPrepaidExpenseCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember		    
Research and Development Expense [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | VJU Gmbh [Member]          
Schedule of Cost-method Investments [Line Items]          
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount $ 100,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VJUGmbhMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		        
[1] (1) The Company did not provide financial support to any of its unconsolidated VIEs during the year ended December 31, 2014. As of December 31, 2014, there were no explicit arrangements or implicit variable interests that could require the Company to provide financial support to any of its unconsolidated VIEs.
[2] (2) VJU's maximum exposure to loss as of December 31, 2014 was limited to the investment cost and research and development fees paid to VJU of $2.5 million and $0.1 million, respectively.