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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Apr. 03, 2015 | Mar. 28, 2014
Income Statement [Abstract] |  |
Product revenue | $ 80,473 us-gaap_SalesRevenueGoodsNet | $ 88,260 us-gaap_SalesRevenueGoodsNet
Service revenue | 23,543 us-gaap_SalesRevenueServicesNet | 19,772 us-gaap_SalesRevenueServicesNet
Net revenue | 104,016 us-gaap_SalesRevenueNet | 108,032 us-gaap_SalesRevenueNet
Product cost of revenue | 35,460 us-gaap_CostOfGoodsSold | 44,606 us-gaap_CostOfGoodsSold
Service cost of revenue | 13,528 us-gaap_CostOfServices | 11,114 us-gaap_CostOfServices
Total cost of revenue | 48,988 us-gaap_CostOfGoodsAndServicesSold | 55,720 us-gaap_CostOfGoodsAndServicesSold
Gross profit | 55,028 us-gaap_GrossProfit | 52,312 us-gaap_GrossProfit
Operating expenses: |  |
Research and development | 22,329 us-gaap_ResearchAndDevelopmentExpense | 23,888 us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative | 31,196 us-gaap_SellingGeneralAndAdministrativeExpense | 33,547 us-gaap_SellingGeneralAndAdministrativeExpense
Amortization of intangibles | 1,446 hlit_FiniteLivedIntangibleAssetsAmortizationExpenseOperatingExpense | 1,950 hlit_FiniteLivedIntangibleAssetsAmortizationExpenseOperatingExpense
Restructuring and related charges | 44 us-gaap_RestructuringCharges | 149 us-gaap_RestructuringCharges
Total operating expenses | 55,015 us-gaap_OperatingExpenses | 59,534 us-gaap_OperatingExpenses
Income (loss) from operations | 13 us-gaap_OperatingIncomeLoss | (7,222)us-gaap_OperatingIncomeLoss
Interest income, net | 55 us-gaap_InvestmentIncomeInterest | 77 us-gaap_InvestmentIncomeInterest
Other income (expense), net | (506)us-gaap_OtherNonoperatingIncomeExpense | 12 us-gaap_OtherNonoperatingIncomeExpense
Loss on impairment of long-term investment | (2,505)us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment | 0 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
Loss before income taxes | (2,943)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (7,133)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Benefit from income taxes | (286)us-gaap_IncomeTaxExpenseBenefit | (1,723)us-gaap_IncomeTaxExpenseBenefit
Net loss | $ (2,657)us-gaap_NetIncomeLoss | $ (5,410)us-gaap_NetIncomeLoss
Net loss per share: |  |
Basic | $ (0.03)us-gaap_EarningsPerShareBasic | $ (0.06)us-gaap_EarningsPerShareBasic
Diluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ (0.06)us-gaap_EarningsPerShareDiluted
Shares used in per share calculation: |  |
Basic | 88,655 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 97,921 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted | 88,655 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 97,921 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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