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Certain Balance Sheet Components - (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Mar. 27, 2015
Sep. 02, 2014
Subsequent Event [Line Items]        
Prepaid inventories (1) (2) $ 1,233us-gaap_Supplies [1],[2] $ 7,500us-gaap_Supplies [1],[2]    
Prepaid expenses and other current assets:        
Prepaid inventories (1) (2) 1,233us-gaap_Supplies [1],[2] 7,500us-gaap_Supplies [1],[2]    
Other prepayments 9,713us-gaap_OtherPrepaidExpenseCurrent 10,823us-gaap_OtherPrepaidExpenseCurrent    
Deferred cost of revenue 2,524us-gaap_AmountOfDeferredCostsRelatedToLongTermContracts 2,656us-gaap_AmountOfDeferredCostsRelatedToLongTermContracts    
Income tax receivable 2,316us-gaap_PrepaidTaxes 0us-gaap_PrepaidTaxes    
Foreign Currency derivative contracts 341us-gaap_DerivativeAssets 0us-gaap_DerivativeAssets    
Other 1,412us-gaap_OtherAssetsCurrent 542us-gaap_OtherAssetsCurrent    
Prepaid Expense and Other Assets, Current 17,539us-gaap_PrepaidExpenseAndOtherAssetsCurrent 21,521us-gaap_PrepaidExpenseAndOtherAssetsCurrent    
Inventories:        
Raw materials 1,422us-gaap_InventoryRawMaterialsNetOfReserves 2,389us-gaap_InventoryRawMaterialsNetOfReserves    
Work-in-process 1,255us-gaap_InventoryWorkInProcessNetOfReserves 976us-gaap_InventoryWorkInProcessNetOfReserves    
Finished goods 30,070us-gaap_InventoryFinishedGoodsNetOfReserves 33,561us-gaap_InventoryFinishedGoodsNetOfReserves    
Total inventories, net 32,747us-gaap_InventoryNet 36,926us-gaap_InventoryNet    
Property and equipment:        
Furniture and fixtures 7,691us-gaap_FurnitureAndFixturesGross 8,227us-gaap_FurnitureAndFixturesGross    
Machinery and equipment 116,031us-gaap_MachineryAndEquipmentGross 114,178us-gaap_MachineryAndEquipmentGross    
Leasehold improvements 8,140us-gaap_LeaseholdImprovementsGross 7,888us-gaap_LeaseholdImprovementsGross    
Property, Plant and Equipment Gross, Total 131,862us-gaap_PropertyPlantAndEquipmentGross 130,293us-gaap_PropertyPlantAndEquipmentGross    
Less: accumulated depreciation and amortization (104,641)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (95,348)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment    
Property and equipment, net 27,221us-gaap_PropertyPlantAndEquipmentNet 34,945us-gaap_PropertyPlantAndEquipmentNet    
Accrued liabilities:        
Accrued compensation 6,655us-gaap_EmployeeRelatedLiabilitiesCurrent 6,688us-gaap_EmployeeRelatedLiabilitiesCurrent    
Accrued incentive compensation 5,125us-gaap_AccruedBonusesCurrent 9,589us-gaap_AccruedBonusesCurrent    
Accrued warranty 4,242us-gaap_ProductWarrantyAccrualClassifiedCurrent 3,606us-gaap_ProductWarrantyAccrualClassifiedCurrent    
Other 19,096us-gaap_OtherAccruedLiabilitiesCurrent 15,466us-gaap_OtherAccruedLiabilitiesCurrent    
Accrued liabilities, Total 35,118us-gaap_AccruedLiabilitiesCurrent 35,349us-gaap_AccruedLiabilitiesCurrent    
Other Liabilities, Noncurrent:        
Deferred rent, long-term 7,501us-gaap_AccruedRentNoncurrent 8,096us-gaap_AccruedRentNoncurrent    
Deferred revenue, long-term 2,890us-gaap_DeferredRevenueNoncurrent 3,308us-gaap_DeferredRevenueNoncurrent    
Other 320us-gaap_OtherSundryLiabilitiesNoncurrent 269us-gaap_OtherSundryLiabilitiesNoncurrent    
Other Liabilities, Noncurrent 10,711us-gaap_OtherLiabilitiesNoncurrent 11,673us-gaap_OtherLiabilitiesNoncurrent    
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Prepaid inventories (1) (2)     7,500us-gaap_Supplies
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Prepaid expenses and other current assets:        
Prepaid inventories (1) (2)     7,500us-gaap_Supplies
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Vislink plc [Member]        
Subsequent Event [Line Items]        
Prepaid inventories (1) (2) 1,200us-gaap_Supplies
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember		      
Noncontrolling Interest, Ownership Percentage by Parent       3.30%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember
Prepaid expenses and other current assets:        
Prepaid inventories (1) (2) $ 1,200us-gaap_Supplies
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= hlit_VislinkplcMember		      
[1] The prepaid inventories at December 31, 2014 of $1.2 million was related to prepayment for software licenses made to Vislink (see Note 5, "Investments in Other Equity Securities" for additional information on Vislink).
[2] In the fourth quarter of 2013, the Company made a $7.5 million advance payment for future inventory requirements to a supplier in order to secure more favorable pricing from the supplier, and in the fourth quarter of 2014, this amount was offset with accounts payable owed to the supplier according to the contract. In the first quarter of 2015, the Company made another $7.5 million advance payment to the same supplier for future inventory requirements and the Company anticipates that this amount will be offset at the end of 2015 against the accounts payable owed to this supplier.