Harmonic (HLIT) 10-K 28 Feb 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Jan. 31, 2014	Jun. 28, 2013
Document And Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'HLIT	'	'
Entity Registrant Name	'HARMONIC INC	'	'
Entity Central Index Key	'0000851310	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Well-known Seasoned Issuer	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Filer Category	'Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	98,547,877	'
Entity Public Float	'	'	$482,307,000

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$90,329	$96,670
Short-term investments	80,252	104,506
Accounts receivable	75,052	85,920
Inventories	36,926	64,270
Deferred income taxes	24,650	21,870
Prepaid expenses and other current assets	21,521	23,636
Total current assets	328,730	396,872
Property and equipment, net	34,945	38,122
Goodwill	198,022	212,518
Intangibles, net	31,119	58,447
Other assets	13,268	11,572
Total assets	606,084	717,531
Current liabilities:	'	'
Accounts payable	22,380	25,447
Income taxes payable	331	1,797
Deferred revenues	27,020	33,235
Accrued liabilities	35,349	42,415
Total current liabilities	85,080	102,894
Income taxes payable, long-term	15,165	49,309
Other non-current liabilities	11,673	11,915
Total liabilities	111,918	164,118
Commitments and contingencies (Notes 17 and 18)	'	'
Stockholders’ equity:	'	'
Preferred stock, $0.001 par value, 5,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.001 par value, 150,000 shares authorized; 99,413 and 114,193 shares issued and outstanding at December 31, 2013 and 2012, respectively	99	114
Capital in excess of par value	2,336,275	2,432,790
Accumulated deficit	-1,841,999	-1,879,026
Accumulated other comprehensive loss	-209	-465
Total stockholders’ equity	494,166	553,413
Total liabilities and stockholders’ equity	$606,084	$717,531

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]	'	'
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares authorized	150,000,000	150,000,000
Common stock, par value	$0.00	$0.00
Common stock, shares issued	99,413,000	114,193,000
Common stock, shares outstanding	99,413,000	114,193,000

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]	'	'	'
Product revenue	$376,598	$396,324	$421,088
Service revenue	85,342	80,547	69,786
Total net revenue	461,940	476,871	490,874
Product cost of revenue	196,766	214,473	216,640
Service cost of revenue	44,729	41,866	37,418
Total cost of revenue	241,495	256,339	254,058
Gross profit	220,445	220,532	236,816
Operating expenses:	'	'	'
Research and development	99,938	102,627	99,314
Selling, general and administrative	134,014	127,117	127,077
Amortization of intangibles	8,096	8,705	8,918
Restructuring and related charges	1,421	0	0
Total operating expenses	243,469	238,449	235,309
Income (loss) from operations	-23,024	-17,917	1,507
Interest income, net	219	515	374
Other income (expense), net	-347	-293	-514
Income (loss) from continuing operations before income taxes	-23,152	-17,695	1,367
Benefit from income taxes	-44,741	-1,506	-651
Income (loss) from continuing operations	21,589	-16,189	2,018
Income from discontinued operations, net of taxes (including gain on disposal of $14,663, net of taxes, for the year ended December 31, 2013)	15,438	5,252	6,761
Net income (loss)	$37,027	($10,937)	$8,779
Basic net income (loss) per share from:	'	'	'
Continuing operations, basic (usd per share)	$0.20	($0.14)	$0.02
Discontinued operations, basic (usd per share)	$0.14	$0.05	$0.06
Net income (loss), basic (usd per share)	$0.35	($0.09)	$0.08
Diluted net income (loss) per share from:	'	'	'
Continuing operations, diluted (usd per share)	$0.20	($0.14)	$0.02
Discontinued operations, diluted (usd per share)	$0.14	$0.05	$0.06
Net income (loss), diluted (usd per share)	$0.34	($0.09)	$0.08
Shares used in per share calculations:	'	'	'
Basic (in shares)	106,529	116,457	115,175
Diluted (in shares)	107,808	116,457	116,427

CONSOLIDATED_STATEMENTS_OF_OPE1

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]	'	'	'
Gain on disposal, net of taxes	$14,663	$0	$0

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]	'	'	'
Net income (loss)	$37,027	($10,937)	$8,779
Other comprehensive income (loss), before tax:	'	'	'
Foreign currency translation adjustments	260	395	-173
Gain (loss) on investments	4	-1	12
Other comprehensive income (loss) before tax	264	394	-161
Income tax expense (benefit) related to items of other comprehensive income (loss)	8	-16	2
Other comprehensive income (loss) net of tax	256	410	-163
Comprehensive income (loss)	$37,283	($10,527)	$8,616

CONSOLIDATED_STATEMENTS_OF_STO

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
In Thousands, except Share data
Balance at Dec. 31, 2010	$520,203	$112	$2,397,671	($1,876,868)	($712)
Balance, Shares at Dec. 31, 2010	'	112,360,000	'	'	'
Net income	8,779	'	'	8,779	'
Other comprehensive loss, net of tax	-163	'	'	'	-163
Issuance of Common Stock under option, stock award and purchase plans	12,701	4	12,697	'	'
Issuance of Common Stock under option, stock award and purchase plans, Shares	'	3,897,000	'	'	'
Stock-based compensation	20,841	'	20,841	'	'
Excess tax benefits from stock-based compensation	1,955	'	1,955	'	'
Balance at Dec. 31, 2011	564,316	116	2,433,164	-1,868,089	-875
Balance, Shares at Dec. 31, 2011	'	116,257,000	'	'	'
Net income	-10,937	'	'	-10,937	'
Other comprehensive loss, net of tax	410	'	'	'	410
Issuance of Common Stock under option, stock award and purchase plans	4,536	3	4,533	'	'
Issuance of Common Stock under option, stock award and purchase plans, Shares	'	3,045,000	'	'	'
Repurchase of Common Stock	-22,639	-5	-22,634	'	'
Repurchase of Common Stock, Shares	'	-5,109,000	'	'	'
Stock-based compensation	18,926	'	18,926	'	'
Excess tax benefits from stock-based compensation	-1,199	'	-1,199	'	'
Balance at Dec. 31, 2012	553,413	114	2,432,790	-1,879,026	-465
Balance, Shares at Dec. 31, 2012	'	114,193,000	'	'	'
Net income	37,027	'	'	37,027	'
Other comprehensive loss, net of tax	256	'	'	'	256
Issuance of Common Stock under option, stock award and purchase plans	5,186	3	5,183	'	'
Issuance of Common Stock under option, stock award and purchase plans, Shares	'	3,482,000	'	'	'
Repurchase of Common Stock	-116,529	-18	-116,511	'	'
Repurchase of Common Stock, Shares	'	-18,262,000	'	'	'
Stock-based compensation	16,089	'	16,089	'	'
Excess tax benefits from stock-based compensation	-1,276	'	-1,276	'	'
Balance at Dec. 31, 2013	$494,166	$99	$2,336,275	($1,841,999)	($209)
Balance, Shares at Dec. 31, 2013	'	99,413,000	'	'	'

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:	'	'	'
Net income (loss)	$37,027	($10,937)	$8,779
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'	'
Amortization of intangibles	27,329	29,204	30,420
Depreciation	16,641	15,195	13,867
Stock-based compensation	16,089	18,926	20,913
Gain on sale of discontinued operations, net of tax	-14,663	0	0
Loss on impairment of fixed assets	149	0	0
Net (gain) loss on disposal of fixed assets	95	-36	671
Deferred income taxes	-8,537	-4,969	-361
Provision for doubtful accounts and sales returns	960	3,602	3,235
Provision for excess and obsolete inventories	3,475	3,377	3,936
Excess tax benefits from stock-based compensation	-141	-121	-1,955
Other non-cash adjustments, net	2,098	1,006	801
Changes in assets and liabilities:	'	'	'
Accounts receivable	9,908	20,368	-11,477
Inventories	13,290	3,003	-16,588
Prepaid expenses and other assets	1,807	-2,684	7,924
Accounts payable	-3,363	-5,201	4,750
Deferred revenues	-1,922	1,334	-13,470
Income taxes payable	-40,546	1,535	-6,843
Accrued and other liabilities	-5,937	-2,789	575
Net cash provided by operating activities	53,759	70,813	45,177
Cash flows from investing activities:	'	'	'
Purchases of investments	-78,764	-133,778	-107,544
Proceeds from maturities of investments	63,034	57,484	28,733
Proceeds from sales of investments	37,890	41,354	30,999
Purchases of property and equipment	-14,581	-12,609	-17,269
Proceeds from sale of discontinued operations, net of selling costs	43,515	0	0
Other acquisitions	0	0	-250
Net cash provided by (used in) investing activities	51,094	-47,549	-65,331
Cash flows from financing activities:	'	'	'
Proceeds from issuance of common stock, net	5,186	4,819	12,701
Payments for repurchase of common stock	-116,529	-22,639	0
Excess tax benefits from stock-based compensation	141	121	1,955
Net cash (used in) provided by financing activities	-111,202	-17,699	14,656
Effect of exchange rate changes on cash and cash equivalents	8	122	-52
Net increase (decrease) in cash and cash equivalents	-6,341	5,687	-5,550
Cash and cash equivalents at beginning of period	96,670	90,983	96,533
Cash and cash equivalents at end of period	90,329	96,670	90,983
Supplemental disclosures of cash flow information:	'	'	'
Income tax payments, net	4,341	5,051	7,597
Supplemental schedule of non-cash investing activity:	'	'	'
Net increase in accrued purchases of property and equipment	$321	$113	$0

Description_of_Business

Description of Business	12 Months Ended
	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Description of Business	'
	DESCRIPTION OF BUSINESS
	Harmonic Inc. (“Harmonic” or the “Company”) designs, manufactures and sells versatile and high performance video infrastructure products and system solutions that enable its customers to efficiently create, prepare and deliver a full range of video services, including televisions, personal computers, laptops, tablets and smart phones. Our products generally fall into three principal categories: video production platforms and playout solutions, video processing solutions and cable edge solutions. Harmonic also provides technical support and professional services to its customers worldwide. We sell our products and services to cable operators, broadcast and media companies, satellite and telecommunications (telco) Pay-TV service providers and, more recently, streaming new media companies.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Basis of Presentation
	The accompanying consolidated financial statements of Harmonic include the accounts of the Company and its subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. The Company’s fiscal quarters are based on 13-week periods, except for the fourth quarter which ends on December 31.
	Discontinued Operations
	On March 5, 2013, the Company completed the sale of its cable access HFC business to Aurora Networks (“Aurora”) for $46.0 million in cash. The Consolidated Statements of Operations have been retrospectively adjusted to present the cable access HFC business as discontinued operations, as described in Note 3, "Discontinued Operations”. Unless noted otherwise, all discussions herein with respect to the Company’s audited consolidated financial statements relate to the Company’s continuing operations.
	Use of Estimates
	The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	Reclassifications
	From time to time the Company reclassifies certain period balances to conform to the current year presentation. These reclassifications have no material impact on previously reported total assets, total liabilities, stockholders’ equity, results of operations or cash flows.
	Foreign Currency
	The functional currency of the Company’s Israeli, Cayman and Swiss operations is the U.S. dollar. All other foreign subsidiaries use the respective local currency as the functional currency. When the local currency is the functional currency, gains and losses from translation of these foreign currency financial statements into U.S. dollars are recorded as a separate component of other comprehensive loss in stockholders’ equity.
	For subsidiaries where the functional currency is the U.S. dollar, monetary assets and liabilities denominated in currencies other than the U.S. dollar are remeasured into U.S. dollars using exchange rates prevailing on the balance sheet date. The remeasurement gains and losses are included in other income (expense), net in the Company’s Consolidated Statements of Operations. The Company recorded remeasurement losses of $0.5 million, $0.7 million, and $0.7 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	Fair Value of Financial Instruments
	The carrying value of Harmonic’s financial instruments, including cash equivalents, short-term investments, accounts receivable, accounts payable and accrued liabilities, approximate fair value due to their short maturities.
	Derivative Instruments
	The Company enters into foreign currency forward exchange contracts to minimize the short-term impact of foreign currency exchange rate fluctuations on cash and certain trade and inter-company receivables and payables. The Company does not enter into forward currency forward contracts for trading purposes. These derivative instruments generally have maturities between one to three months. The Company does not designate these forward currency forward exchange contracts as hedging instruments.
	According to the applicable accounting guidance, the assets or liabilities associated with the forward exchange contracts are recorded at fair value in prepaid expenses and other current assets or accrued liabilities in the Company's Consolidated Balance Sheet. Gains or losses resulting from changes in fair value on forward exchange contracts are recognized in earnings monthly and are included in other income (expense), net in the Company's Consolidated Statements of Operations.
	Cash and Cash Equivalents
	Cash and cash equivalents include all cash and highly liquid investments with maturities of three months or less at the date of purchase. The carrying amount of cash and cash equivalents approximates fair value because of the short maturity of those instruments.
	Short-Term Investments
	Harmonic’s short-term investments, which are classified as available-for-sale securities are principally comprised of U.S. federal government bonds, state, municipal and local government agencies bonds, corporate bonds, commercial paper and certificates of deposit, with a final maturity of twenty-four months or less from the date of purchase. Short-term investments are stated at fair value, with unrealized gains and losses reported in accumulated other comprehensive income (loss) in the Consolidated Balance Sheet. The specific identification method is used to determine the cost of securities disposed of, with realized gains and losses reflected in other income (expense), net in the Company’s Consolidated Statements of Operations. Investments are anticipated to be used for current operations and are, therefore, classified as current assets even though maturities may extend beyond one year. The Company monitors its investment portfolio for impairment on a periodic basis. In the event a decline in value is determined to be other than temporary, an impairment charge is recorded. The Company considers current market conditions, as well as the likelihood that it would need to sell its investments prior to a recovery of par value, when determining if a loss is other than temporary.
	Concentrations of Credit Risk/Major Customers/Supplier Concentration
	Financial instruments which subject Harmonic to concentrations of credit risk consist primarily of cash, cash equivalents, short-term investments and accounts receivable. Cash, cash equivalents and short-term investments are invested in short-term, highly liquid, investment-grade obligations of commercial or governmental issuers, in accordance with Harmonic’s investment policy. The investment policy limits the amount of credit exposure to any one financial institution, commercial or governmental issuer. Harmonic’s accounts receivable are derived from sales to cable, satellite, telco, broadcast and other media companies. Harmonic generally does not require collateral from its customers, and performs ongoing credit evaluations of its customers and provides for expected losses. Harmonic maintains an allowance for doubtful accounts based upon the expected collectability of its accounts receivable. No customers had a balance greater than 10% of the Company’s net accounts receivable balance as of December 31, 2013 and 2012. In the years ended December 31, 2013, 2012 and 2011, sales to Comcast accounted for 12%, 11% and 10%, respectively, of net revenue.
	Certain of the components and subassemblies included in the Company’s products are obtained from a single source or a limited group of suppliers. Although the Company seeks to reduce dependence on those sole source and limited source suppliers, the partial or complete loss of certain of these sources could have at least a temporary adverse effect on the Company’s results of operations and damage customer relationships.
	Revenue Recognition
	Harmonic’s principal sources of revenue are from the sale of hardware, software, hardware and software maintenance contracts, and end-to-end solutions, encompassing design, manufacture, test, integration and installation of products. Harmonic recognizes revenue when persuasive evidence of an arrangement exists, delivery has occurred or services have been provided, the sale price is fixed or determinable, and collectability is reasonably assured.
	Revenue from the sale of hardware and software products is recognized when risk of loss and title have transferred. For most of the Company’s product sales, these criteria are met at the time the product is shipped or delivery has occurred. Revenue from distributors and system integrators is recognized on delivery of the related products, provided all other revenue recognition criteria have been met. The Company’s agreements with these distributors and system integrators have terms which are generally consistent with the standard terms and conditions for the sale of the Company’s equipment to end users, and do not provide for product rotation or pricing allowances, as are typically found in agreements with stocking distributors. The Company accrues for sales returns and other allowances based on its historical experience.
	Deferred revenue includes billings in excess of revenue recognized, net of deferred cost of revenue, and invoiced amounts remain deferred until applicable revenue recognition criteria are met.
	Shipping and handling costs incurred for inventory purchases and product shipments are recorded in cost of revenue in the Company’s Consolidated Statements of Operations. Costs associated with services are generally recognized as incurred.
	The Company recognizes revenue from the sale of hardware products and software bundled with hardware that is essential to the functionality of the hardware in accordance with applicable revenue recognition accounting guidance. For the sale of stand-alone software products, bundled with hardware but not essential to the functionality of the hardware, revenue is allocated between the hardware, including essential software and related elements, and the non-essential software and related elements. Revenue for the hardware and essential software elements are recognized under the relative allocation method. Revenue for the non-essential software and related elements are recognized under the residual method in accordance with software accounting guidance. Revenue associated with service and maintenance agreements is recognized on a straight-line basis over the period in which the services are performed, generally one year. The Company recognizes revenue associated with solution sales using the percentage of completion or completed contract methods of accounting. Further details of these accounting policies are described below.
	Multiple Element Arrangements. The Company has revenue arrangements that include hardware and software essential to the hardware product’s functionality, and non-essential software, services and support. For transactions originating or materially modified, beginning January 1, 2011, the Company has applied the accounting guidance that requires the Company to allocate revenue to all deliverables based on their relative selling prices. For transactions originating prior to January 1, 2011, the Company applied software revenue recognition accounting guidance, as described in the “Software” section below. The Company determines the relative selling prices by first considering vendor-specific objective evidence of fair value (“VSOE”), if it exists; otherwise third-party evidence (“TPE”) of the selling price is used. If neither VSOE nor TPE exists for a deliverable, the Company uses a best estimate of the selling price (“BESP”) for that deliverable. Once revenue is allocated to all deliverables based on their relative selling prices, revenue related to hardware elements (hardware, essential software and related services) are recognized using a relative selling price allocation and non-essential software and related services are recognized under the residual method.
	Harmonic has established VSOE for certain elements of its arrangements based on either historical stand-alone sales to third parties or stated renewal rates for maintenance. The Company has VSOE of fair value for maintenance, training and certain professional services.
	TPE is determined based on competitor prices for similar deliverables when sold separately. The Company is typically not able to determine TPE for competitors’ products or services. Generally, the Company’s go-to-market strategy differs from that of its competitors’ and the Company’s offerings contain a significant level of differentiation, such that the comparable pricing of products with similar functionality cannot be obtained. Furthermore, the Company is unable to reliably determine what competitor similar products’ selling prices are on a stand-alone basis.
	When the Company is unable to establish fair value of non-software deliverables using VSOE or TPE, the Company uses BESP in its allocation of arrangement consideration. The objective of using BESP is to determine the price at which the Company would transact a sale if the product or service were sold on a stand-alone basis. The Company determines BESP for a product or service by considering multiple factors, including, but not limited to, pricing practices, market conditions, competitive landscape, internal costs, geographies and gross margin. The determination of BESP is made through consultation with Company’s management, taking into consideration the Company’s go-to-market strategy.
	Software. Sales of stand-alone software that are not considered essential to the functionality of the hardware continue to be subject to the software revenue recognition guidance. Further, the Company also applied the software revenue recognition guidance to its multiple element arrangements for transactions originating prior to January 1, 2011.
	In accordance with the software revenue recognition guidance, the Company applies the residual method to recognize revenue for the delivered elements in stand-alone software transactions. Under the residual method, the amount of revenue allocated to delivered elements equals the total arrangement consideration, less the aggregate fair value of any undelivered elements, typically maintenance, provided that vendor specific objective evidence ("VSOE") of fair value exists for all undelivered elements. VSOE of fair value is based on the price charged when the element is sold separately or, in the case of maintenance, substantive renewal rates for maintenance.
	Solution Sales. Solution sales for the design, manufacture, test, integration and installation of products, including equipment acquired from third parties to be integrated with Harmonic’s products, that are customized to meet the customer’s specifications are accounted for in accordance with applicable guidance on accounting for performance of construction/production contracts. Accordingly, for each arrangement that the Company enters into that includes both products and services, the Company performs a detailed evaluation to determine whether the arrangement should be accounted for under guidance for construction/production contracts or, alternatively, for arrangements that do not involve significant production, modification or customization, under other applicable accounting guidance. The Company has a long-standing history of entering into contractual arrangements to deliver the solution sales described.
	At the outset of each arrangement accounted for as a single arrangement, the Company develops a detailed project plan and associated labor hour estimates for each project. The Company believes that, based on its historical experience, it has the ability to make labor cost estimates that are sufficiently dependable to justify the use of the percentage-of-completion method of accounting and, accordingly, utilizes percentage-of-completion accounting for most arrangements that are determined to be single arrangements. Under the percentage-of-completion method, revenue recognized reflects the portion of the anticipated contract revenue that has been earned, equal to the ratio of actual labor hours expended to total estimated labor hours to complete the project. Costs are recognized proportionally to the labor hours incurred. For contracts that include customized services for which labor costs are not reasonably estimable, the Company uses the completed contract method of accounting. Under the completed contract method, 100% of the contract’s revenue and cost is recognized upon the completion of all services under the contract. If the estimated costs to complete a project exceed the total contract amount, indicating a loss, the entire anticipated loss is recognized.
	Inventories
	Inventories are stated at the lower of cost, using the weighted average method (which approximates the first-in, first-out basis), or market. The cost of inventories is comprised of material, labor and manufacturing overhead. The Company's manufacturing overhead standards for product costs are calculated assuming full absorption of forecasted spending over projected volumes. Harmonic establishes provisions for excess and obsolete inventories to reduce such inventories to their estimated net realizable value after evaluation of historical sales, future demand and market conditions, expected product life cycles and current inventory levels. Such provisions are charged to cost of revenue in the Company’s Consolidated Statements of Operations.
	Capitalized Software Development Costs
	Costs related to research and development are generally charged to expense as incurred. Capitalization of material software development costs begins when a product’s technological feasibility has been established. To date, the time period between achieving technological feasibility, which the Company has defined as the establishment of a working model, which typically occurs when beta testing commences, and the general availability of such software has been short, and, as such, software development costs qualifying for capitalization have been insignificant.
	The Company incurs costs associated with developing software for internal use and for which no plan exists to market the software externally. The Company capitalizes the costs as part of property and equipment and recognizes the associated depreciation over a useful life of generally three years. In the years ended December 31, 2013, 2012 and 2011, the Company capitalized $1.4 million, $0.8 million and $1.1 million, respectively, in internal use software development costs.
	Property and Equipment
	Property and equipment are recorded at cost. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the assets. Estimated useful lives are five years for furniture and fixtures, three years for software developed for internal use and typically four years for machinery and equipment. Depreciation and amortization for leasehold improvements are computed using the shorter of the remaining useful lives of the assets, up to ten years, or the lease term of the respective assets.
	Goodwill
	Goodwill represents the difference between the purchase price and the estimated fair value of the identifiable assets acquired and liabilities assumed. The Company tests for impairment of goodwill on an annual basis in the fourth quarter of each of its fiscal years at the Company level, which is the sole reporting unit, and at any other time at which events occur or circumstances indicate that the carrying amount of goodwill may exceed its fair value. When assessing the goodwill for impairment, the Company considers its market capitalization adjusted for a control premium and, if necessary, the Company’s discounted cash flow model, which involves significant assumptions and estimates, including the Company’s future financial performance, the Company’s weighted average cost of capital and the Company’s interpretation of currently enacted tax laws. Circumstances that could indicate impairment and require the Company to perform an impairment test include: a significant decline in the financial results of the Company’s operations; the Company’s market capitalization relative to net book value; unanticipated changes in competition and the Company’s market share; significant changes in the Company’s strategic plans; or adverse actions by regulators.
	There was no impairment of goodwill resulting from the Company’s annual impairment testing in the fourth quarter of 2013. See Note 4, “Goodwill and Identified Intangible Assets” for additional information.
	Long-lived Assets
	Long-lived assets represent property and equipment and purchased intangible assets. Purchased intangible assets from business combinations and asset acquisitions include customer contracts, trademarks and tradenames, and maintenance agreements and related relationships, the amortization of which is charged to general and administrative expenses, and core technology and developed technology, the amortization of which is charged to cost of revenue. The Company evaluates the recoverability of intangible assets and other long-lived assets when indicators of impairment are present. When impairment indicators are present, the Company evaluates the recoverability of intangible assets and other long-lived assets on the basis of undiscounted cash flows from each asset group. If impairment is indicated, provisions for impairment are determined based on fair value, principally using discounted cash flows. This evaluation involves significant assumptions and estimates, including the Company’s future financial performance, the Company’s weighted average cost of capital and the Company’s interpretation of currently enacted tax laws. Circumstances that could indicate impairment and require the Company to perform an impairment test include: a significant decline in the cash flows of such asset or asset group; unanticipated changes in competition and the Company’s market share; significant changes in the Company’s strategic plans; or exiting an activity resulting from a restructuring of operations. See Note 4, “Goodwill and Identified Intangible Assets” for additional information.
	Restructuring and Related Charges
	The Company's restructuring charges consist of employee severance, one-time termination benefits related to the reduction of its workforce, lease exit costs, and other costs. Liabilities for costs associated with a restructuring activity are recognized when the liability is incurred and are measured at fair value. One-time termination benefits are expensed at the date the entity notifies the employee, unless the employee must provide future service, in which case the benefits are expensed ratably over the future service period. Termination benefits are calculated based on regional benefit practices and local statutory requirements. Costs to terminate a lease before the end of its term are recognized when the entity terminates the contract in accordance with the contract terms. The Company determines the excess facilities accrual based on expected cash payments, under the applicable facility lease, reduced by any estimated sublease rental income for such facility. Other costs primarily consist of costs to write down the values of inventories and leasehold improvement write-down as a result of restructuring activities. See Note 9, “Restructuring Charges” for additional information.
	Warranty
	The Company accrues for estimated warranty costs at the time of revenue recognition and records such accrued liabilities as part of cost of revenue. Management periodically reviews its warranty liability and adjusts the accrued liability based on the terms of warranties provided to customers, historical and anticipated warranty claims experience, and estimates of the timing and cost of warranty claims.
	Advertising Expenses
	The Company expenses all advertising costs as incurred. Advertising expense was $0.4 million, $0.5 million and $0.8 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	Stock-based Compensation Expense
	Harmonic measures and recognizes compensation expense for all stock-based compensation awards made to employees and directors, including stock options, restricted stock units and awards related to our Employee Stock Purchase Plan (“ESPP”), based upon the grant-date fair value of those awards.
	Applicable accounting guidance requires companies to estimate the fair value of stock-based compensation awards on the date of grant. The value of the portion of the award that is ultimately expected to vest is recognized as expense over the requisite service period in the Company’s Consolidated Statements of Operations.
	The fair value of stock options is estimated at grant date using the Black-Scholes option pricing model. The Company’s determination of fair value of stock options on the date of grant, using an option pricing model, is affected by the Company’s stock price, as well as the assumptions regarding a number of highly complex and subjective variables. These variables include, but are not limited to, the Company’s expected stock price volatility over the term of the awards and projected employee stock option exercise behaviors. The fair value of each restricted stock unit grant is based on the underlying value of the Company’s common stock on the date of grant.
	Income Taxes
	In preparing the Company’s financial statements, the Company estimates the income taxes for each of the jurisdictions in which the Company operates. This involves estimating the Company’s actual current tax exposures and assessing temporary and permanent differences resulting from differing treatment of items, such as reserves and accruals, for tax and accounting purposes.
	The Company’s income tax policy is to record the estimated future tax effects of temporary differences between the tax bases of assets and liabilities and amounts reported in the Company’s accompanying Consolidated Balance Sheets, as well as operating loss and tax credit carryforwards. The Company follows the guidelines set forth in the applicable accounting guidance regarding the recoverability of any tax assets recorded on the Consolidated Balance Sheet and provides any necessary allowances as required. Determining necessary allowances requires the Company to make assessments about the timing of future events, including the probability of expected future taxable income and available tax planning opportunities.
The Company is subject to examination of its income tax returns by various tax authorities on a periodic basis. The Company regularly assesses the likelihood of adverse outcomes resulting from such examinations to determine the adequacy of its provision for income taxes. The Company has applied the provisions of the applicable accounting guidance on accounting for uncertainty in income taxes, which requires application of a more-likely-than-not threshold to the recognition and de-recognition of uncertain tax positions. If the recognition threshold is met, the applicable accounting guidance permits the Company to recognize a tax benefit measured at the largest amount of tax benefit that, in the Company’s judgment, is more than 50 percent likely to be realized upon settlement. It further requires that a change in judgment related to the expected ultimate resolution of uncertain tax positions be recognized in earnings in the period of such change.
The Company files annual income tax returns in multiple taxing jurisdictions around the world. A number of years may elapse before an uncertain tax position is audited and finally resolved. While it is often difficult to predict the final outcome or the timing of resolution of any particular uncertain tax position, the Company believes that its reserves for income taxes reflect the most likely outcome. The Company adjusts these reserves and penalties, as well as the related interest, in light of changing facts and circumstances. Changes in the Company’s assessment of its uncertain tax positions or settlement of any particular position could materially and adversely impact the Company’s income tax rate, operating results, financial position and cash flows.
Comprehensive Income (Loss)
Comprehensive income (loss) includes net income (loss) and other comprehensive income (loss). Other comprehensive income (loss) includes cumulative translation adjustments and unrealized gains and losses on available-for-sale securities.
Recent Accounting Pronouncements
In December 2011, the FASB issued Accounting Standard Update (“ASU”) 2011-11, “Disclosures about offsetting assets and liabilities”. This guidance enhances disclosure requirements about the nature of an entity’s right to offset. The new guidance requires the disclosure of the gross amounts subject to rights of offset, amounts offset in accordance with the accounting standards followed, and the related net exposure. The new guidance became effective for the Company beginning in the first quarter of fiscal 2013 and it did not have a material impact on the Company’s Consolidated Financial Statements.
In July 2012, the FASB issued ASU 2012-2, “Intangibles - Goodwill and Other”, which allows an entity to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived asset is impaired for determining whether it is necessary to perform the quantitative impairment test. This accounting standard update became effective for the Company beginning in the first quarter of fiscal 2013 and did not have any impact on the Company’s Consolidated Financial Statements.
In February 2013, the FASB issued ASU 2013-2, “Comprehensive Income”, which requires reclassification adjustments from other comprehensive income to be presented either in the financial statements or in the notes to the financial statements. The Company adopted this new guidance in the first quarter of fiscal 2013 and included the required disclosures.
In March 2013, the FASB issued ASU 2013-5, “Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity”. The ASU addresses accounting for a cumulative translation adjustment when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity. The guidance is effective for the Company beginning in the first quarter of its 2014 fiscal year and should be applied prospectively. The Company does not expect the adoption of ASU 2013-05 will have a material impact on its financial position, results of operations or cash flows.
In July 2013, the FASB issued ASU 2013-11, “Presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists”. Under certain circumstances, unrecognized tax benefits should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. The Company does not expect the adoption of ASU 2013-11 will have a material impact on its financial position, results of operations or cash flows. The guidance is effective for the Company beginning in the first quarter of its 2014 fiscal year and will be applied prospectively.

Discontinued_Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]	'
Discontinued Operations	'
	DISCONTINUED OPERATIONS
	On February 18, 2013, the Company entered into an Asset Purchase Agreement with Aurora pursuant to which the Company agreed to sell its cable access HFC business for $46 million in cash. On March 5, 2013, the sale transaction closed and the Company received gross proceeds of $46 million from the sale and recorded a net gain of $14.7 million in connection with the sale.
	In accordance with ASC 205 “Presentation of financial statements – Discontinued Operations”, a business is classified as a discontinued operation when: (i) the operations and cash flows of the business can be clearly distinguished and have been or will be eliminated from our ongoing operations; (ii) the business has either been disposed of or is classified as held for sale; and (iii) the Company will not have any significant continuing involvement in the operations of the business after the disposal transactions.
	On March 5, 2013, the Company entered into a transition services agreement (‘TSA”) with Aurora to provide contract manufacturing for up to five months and other various support, including providing order fulfillment, taking warranty calls, attending to product returns from customers, providing cost accounting analysis, receiving payments from customers and remitting such payments to Aurora. The TSA fees are a fixed amount per month and were determined based on the Company’s estimated cost of delivering the transition services. In addition, on April 24, 2013, the Company and Aurora signed a sublease agreement for the Company’s Milpitas warehouse for the remaining period of the lease. The Company and Aurora later agreed to limit the services provided under the agreement to sales order processing support and quote support through May 2013, warehouse facilities support through July 2013, accounts payable support through June 2013, and accounts receivable collection support through October 2013, and the TSA fees were amended accordingly.
	The Company determined that the cash flows generated from these transactions are both insignificant and are considered indirect cash flows. As a result, the sale of the cable access HFC business is appropriately presented as discontinued operations. The TSA billing to Aurora in the year ended December 31, 2013 was $1.0 million, and it was recorded in the Consolidated Statements of Operations under income from continuing operations as an offset to the expenses incurred to deliver the transition services. The table below provides details on the income statement caption under which the TSA billing was recorded (in thousands):
		Year ended
		31-Dec-13
	Product cost of revenue	$	577
	Research and development	21
	Selling, general and administrative	379
	Total TSA billing to Aurora	$	977
	The Company recorded a gain of $14.7 million for the year ended December 31, 2013, in connection with the sale of the cable access HFC business, calculated as follows (in thousands):
	Gross Proceeds				$	46,000
	Less : Carrying value of net assets
	Inventories, net	$	10,579
	Prepaid expenses and other current assets	612
	Property and equipment, net	1,194
	Goodwill de-recognized	14,547
	Deferred revenue	(4,499		)
	Accrued liabilities	(939		)
	Total net assets sold and de-recognized				$	21,494
	Less : Selling cost				2,485
	Less : Tax effect				7,358
	Gain on disposal, net of tax				$	14,663
	Since the Company has one reporting unit, upon the sale of the cable access HFC business, approximately $14.5 million of the carrying value of goodwill was allocated to the cable access HFC business based on the relative fair value of the cable access HFC business to the fair value of the Company. The remaining carrying value of goodwill was tested for impairment, and the Company determined that goodwill was not impaired as of March 29, 2013.
	The results of operations associated with the cable access HFC business are presented as discontinued operations in the Company’s Consolidated Statements of Operations for all periods presented. Revenue and the components of net income related to the discontinued operations for the years ended December 31, 2013, 2012 and 2011 were as follows (in thousands):
		Year ended December 31
		2013			2012		2011
	Revenue	$	9,717		$	53,593	$	58,458
	Operating income	$	539		$	8,610	$	10,266
	Less : Provision for (benefit from) income taxes	(236		)	3,358		3,505
	Add : Gain on disposal, net of tax	14,663			—		—
	Income from discontinued operations, net of taxes	$	15,438		$	5,252	$	6,761

Goodwill_and_Identified_Intang

Goodwill and Identified Intangible Assets	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Identified Intangible Assets	'
	GOODWILL AND IDENTIFIED INTANGIBLE ASSETS
	The following is a summary of identified intangible assets (in thousands):
				31-Dec-13										31-Dec-12
		Range of Useful Lives		Gross				Accumulated				Net		Gross		Accumulated			Net
				Carrying				Amortization				Carrying		Carrying		Amortization			Carrying
				Amount								Amount		Amount					Amount
	Identifiable intangibles:
	Developed core technology	4-6 years		$	136,145			$	(121,681	)		$	14,464	$	136,145	$	(102,449	)	$	33,696
	Customer relationships/contracts	5-6 years		67,098				(53,772		)		13,326		67,098		(48,150		)	18,948
	Trademarks and tradenames	4-5 years		11,361				(10,565		)		796		11,361		(9,145		)	2,216
	Maintenance agreements and related relationships	6-7 years		7,100				(4,567		)		2,533		7,100		(3,513		)	3,587
	Total identifiable intangibles			$	221,704			$	(190,585	)		$	31,119	$	221,704	$	(163,257	)	$	58,447
	The changes in the carrying amount of goodwill for the years ended December 31, 2013 and 2012 are as follows (in thousands):
		December 31,
		2013				2012
	Balance at beginning of period	$	212,518			$	212,417
	Reduction in goodwill associated with the sale of the cable access HFC Business	(14,547		)		—
	Foreign currency translation adjustment	51				101
	Balance at end of period	$	198,022			$	212,518
	Based on the annual impairment test performed as of December 31, 2013, management determined that the Company’s estimated fair value exceeded the carrying value of its net assets by approximately 82% and that goodwill was not impaired as of December 31, 2013. In addition, the Company has not recorded any impairment charges related to goodwill for any prior periods.
	For the years ended December 31, 2013, 2012 and 2011, the Company recorded a total of $27.3 million, $29.2 million and $30.4 million, respectively, of amortization expense for identified intangibles of which $19.2 million, $20.5 million and $21.5 million, respectively, was included in cost of revenue. The estimated future amortization expense of purchased intangible assets with definite lives is as follows (in thousands):
		Cost of				Operating				Total
		Revenue				Expenses
	Year ended December 31,
	2014	$	13,745			$	6,775			$	20,520
	2015	719				5,783				6,502
	2016	—				4,097				4,097
	2017	—				—				—
	2018	—				—				—
	Total future amortization expense	$	14,464			$	16,655			$	31,119

ShortTerm_Investments

Short-Term Investments	12 Months Ended
	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'
Short-Term Investments	'
	SHORT-TERM INVESTMENTS
	The following table summarizes the Company’s short-term investments (in thousands):
		Amortized		Gross		Gross			Estimated
		Cost		Unrealized		Unrealized			Fair Value
				Gains		Losses
	As of December 31, 2013
	State, municipal and local government agencies bonds	$	40,426	$	38	$	(15	)	$	40,449
	Corporate bonds	33,483		20		(7		)	33,496
	Commercial paper	2,299		—		—			2,299
	U.S. federal government bonds	4,004		4		—			4,008
	Total short-term investments	$	80,212	$	62	$	(22	)	$	80,252
	As of December 31, 2012
	Certificates of deposit	$	1,603	$	—	$	—		$	1,603
	State, municipal and local government agencies bonds	59,009		45		(4		)	59,050
	Corporate bonds	31,568		4		(10		)	31,562
	Commercial paper	10,287		1		—			10,288
	U.S. federal government bonds	2,003		—		—			2,003
	Total short-term investments	$	104,470	$	50	$	(14	)	$	104,506
	The following table summarizes the maturities of the Company’s short-term investments (in thousands):
		December 31,
		2013		2012
	Less than one year	$	55,278	$	76,779
	Due in 1 - 2 years	24,974		27,727
	Total short-term investments	$	80,252	$	104,506
	In the event the Company needs or desires to access funds from the short-term investments that it holds, it is possible that the Company may not be able to do so due to market conditions. If a buyer is found, but is unwilling to purchase the investments at par or the Company’s cost, it may incur a loss. Further, rating downgrades of the security issuer or the third parties insuring such investments may require the Company to adjust the carrying value of these investments through an impairment charge. The Company’s inability to sell all or some of the Company’s short-term investments at par or the Company’s cost, or rating downgrades of issuers or insurers of these securities, could adversely affect the Company’s results of operations or financial condition.
	For the years ended December 31, 2013, 2012 and 2011, realized gains and realized losses from the sale of investments were not material.
	Impairment of Investments
	The Company monitors its investment portfolio for impairment on a periodic basis. In the event that the carrying value of an investment exceeds its fair value and the decline in value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis for the investment is established. A decline of fair value below amortized costs of debt securities is considered other-than temporary if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire amortized cost basis. At the present time, the Company does not intend to sell its investments that have unrealized losses in accumulated other comprehensive loss. In addition, the Company does not believe that it is more likely than not that it will be required to sell its investments that have unrealized losses in accumulated other comprehensive loss before the Company recovers the principal amounts invested. The Company believes that the unrealized losses are temporary and do not require an other-than-temporary impairment, based on its evaluation of available evidence as of December 31, 2013.
	As of December 31, 2013, there were no individual available-for-sale securities in a material unrealized loss position and the amount of unrealized losses on the total investment balance was insignificant.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	FAIR VALUE MEASUREMENTS
	The applicable accounting guidance establishes a framework for measuring fair value and requires disclosure about the fair value measurements of assets and liabilities. This guidance requires the Company to classify and disclose assets and liabilities measured at fair value on a recurring basis, as well as fair value measurements of assets and liabilities measured on a nonrecurring basis in periods subsequent to initial measurement, in a three-tier fair value hierarchy as described below.
	The guidance defines fair value as the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.
	Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The guidance describes three levels of inputs that may be used to measure fair value:
	•	Level 1 — Observable inputs that reflect quoted prices for identical assets or liabilities in active markets.
	•	Level 2 — Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company primarily uses broker quotes for valuation of its short-term investments. The forward exchange contracts are classified as Level 2 because they are valued using quoted market prices and other observable data for similar instruments in an active market.
	•	Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	The Company uses the market approach to measure fair value for its financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. During the years ended December 31, 2013, 2012, and 2011 there were no nonrecurring fair value measurements of assets and liabilities subsequent to initial recognition.
	The following table sets forth the fair value of the Company’s financial assets and liabilities measured at fair value based on the three-tier fair value hierarchy (in thousands):
		Level 1		Level 2		Level 3		Total
	As of December 31, 2013
	Cash equivalents
	Money market funds	$	51,014	$	—	$	—	$	51,014
	Short-term investments
	State, municipal and local government agencies bonds	—		40,449		—		40,449
	Corporate bonds	—		33,496		—		33,496
	Commercial paper	—		2,299		—		2,299
	U.S. federal government bonds	4,008		—		—		4,008
	Prepaids and other current assets
	Derivative assets (1)	—		196		—		196
	Total assets measured and recorded at fair value	$	55,022	$	76,440	$	—	$	131,462
	Accrued Liabilities
	Derivative Liabilities (1)	$	—	$	195	$	—	$	195
	Total liabilities measured and recorded at fair value	$	—	$	195	$	—	$	195
		Level 1		Level 2		Level 3		Total
	As of December 31, 2012
	Cash equivalents
	Money market funds	$	54,923	$	—	$	—	$	54,923
	Corporate bonds with maturity less than 90 days	—		3,614		—		3,614
	U.S. federal government bonds with maturity less than 90 days	3,005		—		—		3,005
	Short-term investments
	Certificates of deposit	—		1,603		—		1,603
	State, municipal and local government agencies bonds	—		59,050		—		59,050
	Corporate bonds	—		31,562		—		31,562
	Commercial paper	—		10,288		—		10,288
	U.S. federal government bonds	2,003		—		—		2,003
	Prepaids and other current assets
	Derivative assets (1)	—		344		—		344
	Total assets measured and recorded at fair value	$	59,931	$	106,461	$	—	$	166,392
	Accrued liabilities
	Derivative liabilities (1)	$	—	$	143	$	—	$	143
	Total liabilities measured and recorded at fair value	$	—	$	143	$	—	$	143
	(1) Derivative assets and liabilities represent forward currency exchange contracts. The Company enters into these contracts to minimize the short-term impact of foreign currency exchange rates fluctuations primarily from trade and inter-company receivables and payables.

Accounts_Receivable

Accounts Receivable	12 Months Ended
	Dec. 31, 2013
Receivables [Abstract]	'
Accounts Receivable	'
	ACCOUNTS RECEIVABLE
	Accounts receivable, net of allowances, consisted of the following (in thousands):
		December 31,
		2013			2012
	Accounts receivable	$	83,266		$	95,515
	Less: allowance for doubtful accounts and sales returns	(8,214		)	(9,595		)
		$	75,052		$	85,920
	Trade accounts receivable are recorded at invoiced amounts and do not bear interest. Harmonic generally does not require collateral and performs ongoing credit evaluations of its customers and provides for expected losses. Harmonic maintains an allowance for doubtful accounts based upon the expected collectability of its accounts receivable. The expectation of collectability is based on the Company’s review of credit profiles of customers, contractual terms and conditions, current economic trends and historical payment experience.
	The following is a summary of activity in allowances for doubtful accounts and sales returns for the three years ended December 31, 2013, 2012 and 2011 (in thousands):
		Balance at			Charges to			Charges		Additions to			Balance at End
		Beginning of			Revenue			(Credits) to		(Deductions			of Period
		Period						Expense		from) Reserves
	Year ended December 31,
	2013	$	9,595		$	537		$	423	$	(2,341	)	$	8,214
	2012	$	8,252		$	3,141		$	461	$	(2,259	)	$	9,595
	2011	$	5,897		$	2,620		$	615	$	(880	)	$	8,252

Certain_Balance_Sheet_Componen

Certain Balance Sheet Components	12 Months Ended
	Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]	'
Certain Balance Sheet Components	'
	CERTAIN BALANCE SHEET COMPONENTS
	The following tables provide details of selected balance sheet components (in thousands):
		December 31,
		2013			2012
	Prepaid expenses and other current assets:
	Prepaid Inventories (1)	$	7,500		$	—
	Other Prepayments	10,823			8,736
	Deferred cost of revenue	2,656			13,953
	Other	542			947
		$	21,521		$	23,636
	(1) 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.
		December 31,
		2013			2012
	Inventories:
	Raw materials	$	2,389		$	10,731
	Work-in-process	976			4,347
	Finished goods	33,561			49,192
		$	36,926		$	64,270
		December 31,
		2013			2012
	Property and equipment:
	Furniture and fixtures	$	8,227		$	7,856
	Machinery and equipment	114,178			108,262
	Leasehold improvements	7,888			7,612
		130,293			123,730
	Less: accumulated depreciation and amortization	(95,348		)	(85,608		)
		$	34,945		$	38,122
		December 31,
		2013			2012
	Accrued liabilities:
	Accrued compensation	$	6,688		$	10,890
	Accrued incentive compensation	9,589			7,403
	Accrued warranty	3,606			4,292
	Other	15,466			19,830
		$	35,349		$	42,415

Restructuring_and_Excess_Facil

Restructuring and Excess Facilities	12 Months Ended
	Dec. 31, 2013
Restructuring and Related Activities [Abstract]	'
Restructuring and Excess Facilities	'
	RESTRUCTURING AND RELATED CHARGES
	Omneon Restructuring
	In 2010, the Company recorded an excess facilities charge of $3.0 million related to the closure of the Omneon headquarters in Sunnyvale, California. The charge was based on future rent payments, net of expected sublease income, to be made through the end of the lease term in June 2013. Subsequent to the original accrual, the Company revised its estimate and additional provisions were recorded. The following table summarizes the activity in the Omneon restructuring accrual during the years ended December 31, 2013, 2012 and 2011 (in thousands):
		Excess
		Facilities
	Balance at December 31, 2010	$	2,862
	Provisions	517
	Cash payments, net of sublease income	(786		)
	Balance at December 31, 2011	2,593
	Provisions	94
	Cash payments, net of sublease income	(1,818		)
	Balance at December 31, 2012	869
	Provisions	28
	Cash payments, net of sublease income	(897		)
	Balance at December 31, 2013	$	—
	HFC Restructuring
	As a result of the sale of the cable access HFC business in March 2013, the Company recorded $600,000 of restructuring charge under “Income from discontinued operations” in the year ended December 31, 2013. The restructuring charge consisted of $505,000 of severance and benefits and $95,000 of contract termination costs. The severance and benefits was related to the termination of nine of the Company's employees by the Company, as a result of the sale of the HFC business, and the reimbursement to Aurora, pursuant to the amended TSA, of severance payable by Aurora as a result of its subsequent termination of ten U.S. employees hired from the Company, in connection with Aurora's purchase of the HFC business. The following table summarizes the activity in the HFC restructuring accrual during the year ended December 31, 2013 (in thousands):
		Severance			Contract Termination			Total
	Restructuring charges in discontinued operations	$	403		$	124		$	527
	Adjustments to restructuring provisions	102			(29		)	73
	Cash payments	(492		)	(95		)	(587		)
	Balance at December 31, 2013	$	13		$	—		$	13
	The Company anticipates that the remaining restructuring accrual balance of $13,000 will be paid out in 2014.
	Harmonic 2013 Restructuring
	The Company implemented a series of restructuring plans in 2013 to reduce costs and improve efficiencies. As a result, the Company recorded restructuring charges of $2.2 million in the year ended December 31, 2013. The restructuring charge consisted of severance and benefits of $1.7 million related to the termination of eighty-five employees worldwide. In addition, the Company wrote-down, to its estimated net realizable value, leasehold improvements and furniture related to its Milpitas warehouse by $149,000, and wrote-down inventory to reflect $404,000 of obsolete inventories arising from the restructuring of its Israel facilities. The following table summarizes the activity in the Harmonic 2013 restructuring accrual during the year ended December 31, 2013 (in thousands):
		Severance			Impairment of Leasehold Improvement			Obsolete Inventories			Total
	Restructuring charges in continued operations	$	1,663		$	101		$	404		$	2,168
	Adjustments to restructuring provisions	29			48			—			77
	Cash payments	(1,513		)	—			—			(1,513		)
	Non-cash write-offs	—			(149		)	(404		)	(553		)
	Balance at December 31, 2013	$	179		$	—		$	—		$	179
	Of the restructuring charge in the year ended December 31, 2013, $824,000 is included in “Product cost of revenue” and the remaining $1,421,000 is included in “Operating expenses-restructuring and related charges” in the Consolidated Statements of Operations. The Company anticipates that the remaining restructuring accrual balance of $179,000 will be paid out in 2014.

Credit_Facilities

Credit Facilities	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Credit Facilities	'
	CREDIT FACILITIES
	Harmonic has a bank line of credit facility with Silicon Valley Bank that provides for borrowings of up to $10.0 million and matures on August 22, 2014. There were no borrowings during the year ended December 31, 2013. As of December 31, 2013, the amount available for borrowing under this facility, net of $0.2 million of standby letters of credit, was $9.8 million.
	This facility, which became effective in August 2011 and was amended in August 2012, contains a financial covenant that requires Harmonic to maintain a ratio of unrestricted cash, accounts receivable and short term investments to current liabilities (less deferred revenue) of at least 1.75 to 1.00. As of December 31, 2013, the Company’s ratio under that covenant was 4.12 to 1. In the event of noncompliance by Harmonic with the covenants under the facility, including the financial covenant referenced above, Silicon Valley Bank would be entitled to exercise its remedies under the facility, including declaring all obligations immediately due and payable. At December 31, 2013, Harmonic was in compliance with the covenants under the line of credit facility. Borrowings pursuant to the line would bear interest at the bank’s prime rate (3.25% at December 31, 2013) or at LIBOR for the desired borrowing period (an annualized rate of 0.17% for a one month borrowing period at December 31, 2013) plus 1.75%, or 1.92%. Borrowings are not collateralized.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Stockholders' Equity	'
	STOCKHOLDERS’ EQUITY
	Preferred Stock
	Harmonic has 5,000,000 authorized shares of preferred stock. In July 2002, the Company classified 100,000 of these shares as Series A Participating Preferred Stock in connection with the Board’s same day approval and adoption of a stockholder rights plan. This plan had a term of ten years and it expired in July 2012.
	Common Stock Issuances
	During the year ended December 31, 2010, the Company issued 14,150,122 shares of common stock as part of the consideration for the purchase of all of the outstanding shares of Omneon. The shares had a fair market value of $95.9 million at the time of issuance. To secure post-closing indemnification obligations of the holders of Omneon capital stock, the Company deposited into escrow an aggregate of approximately $21.0 million in cash and 1,926,920 shares of the Company’s common stock that would otherwise have been issued to those holders. In the first quarter of 2012, the Company submitted an indemnification claim for reimbursement from escrow and received reimbursement of $0.8 million, representing $0.5 million of cash and 40,372 shares of common stock valued at $0.3 million. The return of shares was reflected as a reduction in common stock and additional paid-in-capital. The reimbursement was for previously expensed legal and tax costs incurred by the Company following the date of acquisition. The indemnification period ended on March 15, 2012, and the remaining cash and shares remaining in escrow were distributed to the holders of Omneon capital stock.
	Common Stock Repurchases
	In 2012, the Company’s Board of Directors (the “Board”) approved a stock repurchase program that provided for the repurchase of up to $25 million of the Company’s outstanding common stock. Under the program, the Company is authorized to repurchase shares of common stock in open market transactions at prices deemed appropriate by management, subject to certain pre-determined price/volume guidelines established, from time to time, by the Board. The timing, manner, price and amount of shares repurchased, if any, under the program depends on a variety of factors, including the price and availability of our shares, trading volume and general market conditions. The purchases are funded from available working capital. The program may be suspended, terminated or modified at any time for any reason. The repurchase program does not obligate us to acquire any specific number of shares, and all open market repurchases will be made in accordance with Exchange Act Rule 10b-18, which sets certain restrictions on the method, timing, price and volume of open market stock repurchases.
	During 2012, under the program, the Company repurchased and retired approximately 5.1 million shares of its common stock at an average price of $4.43 per share, for an aggregate purchase price of approximately $22.6 million.
	During 2013, the Company's Board approved $195 million in increases to the program, increasing the aggregate authorized amount of the program to $220 million. On February 6, 2013, the Board approved a modification to the program that permits the Company to also repurchase its common stock pursuant to a plan that meets the requirements of Rule 10b5-1 under the Securities Exchange Act of 1934. The repurchase program is scheduled to expire in December 2014.
	During 2013, the Company repurchased and retired from open market transactions approximately 6.3 million shares of its common stock at an average share price of $6.48 per share for an aggregate price of $40.6 million. In addition, $76.0 million, including $1.0 million of expenses, was spent in the Company's "modified Dutch auction" tender offer, which closed on May 24, 2013. Under the tender offer, the Company repurchased and retired approximately 12.0 million shares of its common stock at $6.25 per share.
	As of December 31, 2013, the Company had utilized approximately $138.2 million cumulatively to repurchase and retire approximately 23.4 million shares of its common stock under the program, including under the Company's tender offer, and approximately $81.8 million was available for future repurchases under this program. The Company charges the excess of cost over par value for the repurchase of its common stock to additional paid-in-capital.
	Accumulated Other Comprehensive Loss
	The components of accumulated other comprehensive loss were as follows (in thousands):
		December 31,
		2013			2012
	Foreign currency translation adjustments	$	(242	)	$	(502	)
	Unrealized gain on investments	33			37
	Accumulated other comprehensive loss	$	(209	)	$	(465	)

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Employee Benefit Plans	'
	EMPLOYEE BENEFIT PLANS
	Stock Option Plans
	1995 Stock Plan. The 1995 Stock Plan provides for the grant of incentive stock options, non-statutory stock options and restricted stock units (“RSUs”). Incentive stock options may be granted only to employees. All other awards may be granted to employees and consultants. Under the terms of the 1995 Stock Plan, incentive stock options may be granted at prices not less than 100% of the fair value of the Company’s common stock on the date of grant and non-statutory stock options may be granted at prices not less than 85% of the fair value of the Company’s common stock on the date of grant. RSUs have no exercise price. Both options and RSUs vest over a period of time as determined by the Board, generally two to four years, and expire seven years from date of grant. Options granted prior to February 2006 expire ten years from the date of grant. Grants of RSUs and any non-statutory stock options issued at prices less than the fair market value on the date of grant decrease the plan reserve 1.5 shares for every unit or share granted and any forfeitures of these awards due to their not vesting would increase the plan reserve by 1.5 shares for every unit or share forfeited. As of December 31, 2013, an aggregate of 18,606,465 shares of common stock were reserved for issuance under the 1995 Stock Plan, of which 8,586,056 shares remained available for grant.
	2002 Director Plan. The 2002 Director Plan provides for the grant of non-statutory stock options and RSUs to non-employee directors of the Company. Under the terms of the 2002 Director Plan, non-statutory stock options may be granted at prices not less than 100% of the fair value of the Company’s common stock on the date of grant. RSUs have no exercise price. Both options and RSUs vest over a period of time as determined by the Board, generally three years for the initial grant and one year for subsequent grants to a non-employee director, and expire seven years from date of grant. Grants of RSUs decrease the plan reserve 1.5 shares for every unit granted and any forfeitures of these awards due to their not vesting would increase the plan reserve by 1.5 shares for every unit forfeited. As of December 31, 2013, an aggregate of 560,841 shares of common stock were reserved for issuance under the 2002 Director Plan, of which 166,655 shares remained available for grant.
	Employee Stock Purchase Plan. The 2002 Employee Stock Purchase Plan (“ESPP”) provides for the issuance of share purchase rights to employees of the Company. The ESPP is intended to qualify as an “employee stock purchase plan” under Section 423 of the Internal Revenue Code. The ESPP enables employees to purchase shares at 85% of the fair market value of the Common Stock at the beginning or end of the offering period, whichever is lower. Offering periods generally begin on the first trading day on or after January 1 and July 1 of each year. Employees may participate through payroll deductions of 1% to 10% of their earnings. In the event that there are insufficient shares in the plan to fully fund the issuance, the available shares will be allocated across all participants based on their contributions relative to the total contributions received for the offering period.
	There was a shortage of approved shares in the ESPP to fund the total employee contributions from January 2, 2013 to June 30, 2013. The shares available in the plan were sufficient to fund approximately 53% of the total contributions. As a result, the shares available were issued ratably to the participants based on each of their contributions during the offering period, relative to the total contributions received from all participants. The participants were refunded the remaining 47% of their contributions and the ESPP was suspended for the second half of 2013. The Company's stockholders approved a 1,000,000 share increase in the authorized shares for the ESPP during the Company's annual meeting on August 14, 2013, and contributions under the ESPP resumed in January 2014.
	Under the ESPP, 1,230,851, 1,598,895 and 945,287 shares were issued during fiscal 2013, 2012 and 2011, respectively, representing $4.8 million, $6.4 million, and $5.2 million in contributions. As of December 31, 2013, a total of 9,499,960 shares had been issued under this plan.
	Assumed Omneon Stock Options. In connection with the Company’s acquisition of Omneon, the Company assumed substantially all stock options and RSUs outstanding under Omneon’s 1998 Stock Option Plan and 2008 Equity Incentive Plan. Options assumed were converted into options to purchase 1,522,000 shares of the Company’s common stock. RSUs assumed were converted into RSUs for the issuance of 1,455,000 shares of the Company’s common stock. The assumed options and RSUs retained all applicable terms and vesting periods. In general, the assumed options vest over a four-year period from the original date of grant and expire 10 years from the original grant date. The assumed RSUs generally vest over a four year period from the original date of grant. As of December 31, 2013, a total of 299,745 shares of common stock were reserved for issuance under the Omneon Plans.
	Other Stock Option Plans. In addition, the Company has various inactive stock-based incentive plans. As of December 31, 2013, an aggregate of 187,650 shares of common stock are reserved for issuance under the inactive plans, representing the aggregate number of shares subject to outstanding stock options and RSUs. No further awards may be granted under any of these plans.
	Stock Options and Restricted Stock Units
	The following table summarizes the Company’s stock option and restricted stock unit activity during the year ended December 31, 2013 (in thousands, except per share amounts):
				Stock Options						Restricted Stock Units
				Outstanding						Outstanding
		Shares		Number			Weighted			Number		Weighted
		Available		of			Average			of		Average
		for Grant		Shares			Exercise			Units		Grant Date
							Price					Fair Value
	Balance at December 31, 2012	10,155		8,900			$	6.83		3,938		$	6.44
	Authorized	—		—			—			—		—
	Granted	(3,757	)	1,505			5.97			1,501		6.02
	Options exercised	—		(888	)		4.14			—		—
	Shares released	—		—			—			(1,888	)	6.29
	Forfeited or canceled	2,354		(1,632	)		7.06			(533	)	6.38
	Balance at December 31, 2013	8,752		7,885			$	6.92		3,018		$	6.34
	The following table summarizes information about stock options outstanding as of December 31, 2013 (in thousands, except per share amounts and term):
		Number		Weighted				Weighted	Aggregate
		of		Average				Average	Intrinsic
		Shares		Exercise				Remaining	Value
				Price				Contractual
								Term (Years)
	Vested and expected to vest	7,631		$	6.95			3.2	$	7,594
	Exercisable	5,556		7.24				2.2	4,638
	The intrinsic value of options vested and expected to vest and exercisable as of December 31, 2013 is calculated based on the difference between the exercise price and the fair value of the Company’s common stock as of December 31, 2013. The intrinsic value of options exercised during the years ended December 31, 2013, 2012 and 2011 was $2.3 million, $0.8 million and $5.2 million, respectively, and is calculated based on the difference between the exercise price and the fair value of the Company’s common stock as of the exercise date.
	The following table summarizes information about restricted stock units outstanding as of December 31, 2013 (in thousands, except term):
		Number of		Weighted		Aggregate
		Shares		Average		Fair
		Underlying		Remaining		Value
		Restricted		Vesting Period
		Stock Units		(Years)
	Vested and expected to vest	2,782		0.8		$	20,534
	The fair value of restricted stock units vested and expected to vest as of December 31, 2013 is calculated based on the fair value of the Company’s common stock as of December 31, 2013.
	401(k) Plan
	Harmonic has a retirement/savings plan which qualifies as a thrift plan under Section 401(k) of the Internal Revenue Code. This plan allows participants to contribute up to the applicable Internal Revenue Code limitations under the plan. Harmonic can make discretionary contributions to the plan of 25% of the first 4% contributed by eligible participants, up to a maximum contribution per participant of $1,000 per year. Employer contributions were suspended from 2009 through 2012, but have been renewed, on the same basis for 2013, totaling $0.4 million.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock-Based Compensation	'
	STOCK-BASED COMPENSATION
	Stock-based compensation expense consists primarily of expenses for stock options and restricted stock units granted to employees and shares issued under the ESPP. The following table summarizes stock-based compensation expense (in thousands):
		Year ended December 31,
		2013			2012				2011
	Employee stock-based compensation in:
	Cost of revenue	$	2,411		$	2,828			$	2,912
	Research and development expense	4,431			6,151				6,618
	Selling, general and administrative expense	9,160			9,449				10,798
	Total stock-based compensation in operating expense	13,591			15,600				17,416
	Total employee stock-based compensation recognized in income (loss) from continuing operations	$	16,002		$	18,428			$	20,328
	Stock Options
	The Company estimated the fair value of all employee stock options using a Black-Scholes valuation model with the following weighted average assumptions:
		Employee Stock Options
		2013		2012			2011
	Expected term (in years)	4.7		4.7			4.75
	Volatility	50	%	56	%		55	%
	Risk-free interest rate	0.9	%	0.9	%		1.8	%
	Dividend yield	0	%	0	%		0	%
	The expected term represents the weighted-average period that the stock options are expected to remain outstanding. The computation of expected term was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and expectations of future employee behavior. The Company uses its historical volatility for a period equivalent to the expected term of the options to estimate the expected volatility. The risk-free interest rate that the Company uses in the Black-Scholes option valuation model is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term. The Company has never declared or paid any cash dividends and does not plan to pay cash dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model.
	The Company is required to estimate forfeitures at the time of grant and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical data to estimate pre-vesting option forfeitures and records stock-based compensation expense only for those awards that are expected to vest. All stock-based payment awards are amortized on a straight-line basis over the requisite service periods of the awards, which are generally the vesting periods.
	The weighted-average fair value per share of options granted for the years ended December 31, 2013, 2012 and 2011 was $2.55, $2.64 and $4.20, respectively. The fair value of all stock options vested during the years ended December 31, 2013, 2012 and 2011 was $3.3 million, $4.7 million and $7.1 million, respectively.
	The total realized tax benefit attributable to stock options exercised during the years ended December 31, 2013, 2012 and 2011, in jurisdictions where this expense is deductible for tax purposes, was $0.1 million, $0.1 million and $2.0 million, respectively.
	Restricted Stock Units
	The estimated fair value of restricted stock units is based on the market price of the Company’s common stock on the grant date. The fair value of all restricted stock units issued during the years ended December 31, 2013, 2012 and 2011 was $11.9 million, $12.3 million and $10.5 million, respectively.
	Employee Stock Purchase Plan
	The value of the stock purchase right under the ESPP consists of (1) the 15% discount on the purchase of the stock, (2) 85% of the fair value of the call option, and (3) 15% of the fair value of the put option. The call option and put option were valued using the Black-Scholes option pricing model with the following assumptions:
		Employee Stock Purchase Plan
		2013		2012			2011
	Expected term (in years)	0.5		0.5			0.5
	Volatility	31	%	49	%		45	%
	Risk-free interest rate	0.2	%	0.2	%		0.2	%
	Dividend yield	0	%	0	%		0	%
	The expected term represents the period of time from the beginning of the offering period to the purchase date. The Company uses its historical volatility for a period equivalent to the expected term of the options to estimate the expected volatility. The risk-free interest rate that the Company uses in the Black-Scholes option valuation model is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term. The Company has never declared or paid any cash dividends and does not plan to pay cash dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model.
	The weighted-average fair value per share of stock purchase rights granted for the years ended December 31, 2013, 2012 and 2011 was $1.21, $1.33 and $2.15, respectively.
	Unrecognized Stock-Based Compensation
	As of December 31, 2013, total unamortized stock-based compensation cost related to unvested stock options and restricted stock units was $18.1 million. This amount will be recognized as expense using the straight-line attribution method over the remaining weighted-average amortization period of 1.8 years.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	INCOME TAXES
	(Loss) income from continuing operations before income taxes consists of the following (in thousands):
		Year ended December 31,
		2013				2012				2011
	United States	$	(31,521	)		$	(27,068	)		$	(14,164	)
	International	8,369				9,373				15,531
	(Loss) income from continuing operations before income taxes	$	(23,152	)		$	(17,695	)		$	1,367
	The components of the benefit from income taxes consist of the following (in thousands):
		Year ended December 31,
		2013				2012				2011
	Current:
	Federal	$	(38,243	)		$	857			$	(95	)
	State	93				212				529
	International	1,988				1,193				1,222
	Deferred:
	Federal	(10,543		)		(2,053		)		(3,618		)
	State	3,023				(1,362		)		(392		)
	International	(1,059		)		(353		)		1,703
	Total benefit from income taxes	$	(44,741	)		$	(1,506	)		$	(651	)
	The differences between the (benefit from) provision for income taxes computed at the U.S. federal statutory rate at 35% and the Company’s actual (benefit from) provision for income taxes are as follows (in thousands):
		Year ended December 31,
		2013				2012				2011
	(Benefit from) provision for income taxes at U.S. Federal statutory rate	$	(8,103	)		$	(6,193	)		$	478
	State taxes	2,940				(824		)		(1,034		)
	Differential in rates on foreign earnings	(1,396		)		(4,880		)		(9,565		)
	Losses for which no benefit is taken	4,311				7,279				9,185
	Change in valuation allowance	(996		)		(1,104		)		1,822
	Change in liabilities for uncertain tax positions	(35,742		)		1,495				(1,666		)
	Non-deductible stock-based compensation	981				1,974				1,854
	Research and development tax credits	(5,044		)		—				(2,006		)
	Non-deductible meals and entertainment	346				208				213
	Adjustments related to tax positions taken during prior years	(1,154		)		619				(255		)
	Tax-exempt investment income	(304		)		(248		)		(71		)
	Other	(580		)		168				394
	Total (benefit from) provision for income taxes	$	(44,741	)		$	(1,506	)		$	(651	)
	The Company operates in multiple jurisdictions and its profits are taxed pursuant to the tax laws of these jurisdictions. Our effective income tax rate may be affected by changes in or interpretations of tax laws and tax agreements in any given jurisdiction, utilization of net operating loss and tax credit carry forwards, changes in geographical mix of income and expense, and changes in management's assessment of matters such as the ability to realize deferred tax assets.
	The benefit from income taxes for the year ended December 31, 2013 included a release of $39.0 million of tax reserves, including accrued interests and penalties, for our 2008 and 2009 tax years in the U.S., as a result of the expiration of the applicable statute of limitations for those tax years.
	On January 2, 2013, the enactment in the U.S. of the American Taxpayer Relief Act of 2013 extended retroactively through the end of calendar year 2013 the U.S federal research and development tax credit which had expired on December 31, 2011. As a result, the income tax benefit for the year ended December 31, 2013 included a $2.4 million tax benefit from the reinstatement of the 2012 U.S. federal research tax credit.
	The components of net deferred tax assets included in the Consolidated Balance Sheets are as follows (in thousands):
		December 31,
		2013				2012
	Deferred tax assets:
	Reserves and accruals	$	29,235			$	31,999
	Net operating loss carryovers	27,253				27,522
	Research and development credit carryovers	18,391				13,704
	Deferred stock-based compensation	7,554				7,684
	Other tax credits	2,738				2,207
	Gross deferred tax assets	85,171				83,116
	Valuation allowance	(38,644		)		(34,347		)
	Gross deferred tax assets after valuation allowance	46,527				48,769
	Deferred tax liabilities:
	Depreciation and amortization	(3,590		)		(5,485		)
	Intangibles	(6,227		)		(11,656		)
	Other	(738		)		(483		)
	Gross deferred tax liabilities	(10,555		)		(17,624		)
	Net deferred tax assets	$	35,972			$	31,145
	The following table summarizes the activity related to the Company's valuation allowance (in thousands):
		Year ended December 31,
		2013				2012				2011
	Balance at beginning of period	$	34,347			$	28,354			$	26,557
	Additions	6,364				5,993				1,797
	Deductions	(2,067		)		—				—
	Balance at end of period	$	38,644			$	34,347			$	28,354
Management regularly assesses the ability to realize deferred tax assets recorded based upon the weight of available evidence, including such factors as recent earnings history and expected future taxable income on a jurisdiction by jurisdiction basis. In the event that the Company changes its determination as to the amount of realizable deferred tax assets, the Company will adjust its valuation allowance with a corresponding impact to the provision for income taxes in the period in which such determination is made. As of December 31, 2013, the Company had a valuation allowance of $38.6 million, which primarily relates to foreign net operating losses and a portion of its U.S. California tax credits.
As of December 31, 2013, the Company had $96.4 million and $85.3 million of foreign and U.S. California state net operating loss carryforwards ("NOL"), respectively. There is no expiration to the utilization of the foreign NOL, while the U.S. California NOL will begin to expire at various dates beginning in 2014 through 2031, if not utilized. As of December 31, 2013, the U.S. California NOL included approximately $8.8 million relating to stock options tax deductions. These amounts are not included in the Company’s gross or net deferred tax assets pursuant to applicable accounting guidance and, if and when realized, through a reduction in income tax payable, will be accounted for as a credit to additional paid-in capital.
As of December 31, 2013, the Company had U.S. federal and California state tax credit carryforwards of approximately $5.9 million and $29.8 million, respectively. If not utilized, the U.S. federal tax credit carryforwards will begin to expire in 2031, while the California tax credit forward will not expire. In addition, as of December 31, 2013, the Company had U.S. federal alternative minimum tax ("AMT") credit carryforward of approximately $2.7 million, which will not expire.
The Company has not provided U.S. federal and California state income taxes, as well as foreign withholding taxes, on approximately $77.5 million of cumulative undistributed earnings for certain non-U.S. subsidiaries, because such earnings are intended to be indefinitely reinvested. Determination of the amount of unrecognized deferred tax liability for temporary differences related to investment in these non-U.S. subsidiaries that are essentially permanent in duration is not practicable.
The Company applies the provisions of the applicable accounting guidance regarding accounting for uncertainty in income taxes, which requires application of a more-likely-than-not threshold to the recognition and derecognition of uncertain tax positions. If the recognition threshold is met, the applicable accounting guidance permits the recognition of a tax benefit measured at the largest amount of such tax benefit that, in our judgment, is more than fifty percent likely to be realized upon settlement. It further requires that a change in judgment related to the expected ultimate resolution of uncertain tax positions be recognized in earnings in the period in which such determination is made.
The following table summarizes the activity related to the Company’s gross unrecognized tax benefits (in millions):
	Year ended December 31,
	2013			2012			2011
Balance at beginning of period	52.1			52.5			48.4
Increase in balance related to tax positions taken during current year	5.4			0.6			6.6
Decrease in balance as a result of a lapse of the applicable statues of limitations	(1.3	)		(0.9	)		(2.1	)
Decrease in balance due to settlement with tax authorities	(32.1	)		—			—
Increase in balance related to tax positions taken during prior years	0.1			—			—
Decrease in balance related to tax positions taken during prior years	—			(0.1	)		(0.4	)
Balance at end of period	24.2			52.1			52.5
The total amount of unrecognized tax benefits that would affect the effective tax rate is approximately $24.2 million at December 31, 2013.
The Company recognizes interest and penalties related to unrecognized tax positions in income tax expenses. During the year ended December 31, 2013, the Company reversed approximately $5.6 million of interest and penalties previously accrued, primarily resulting from the expiration of the statute of limitations on the Company's 2008 and 2009 U.S. corporate income tax return in September 2013. During the years ended December 31, 2012 and 2011, the Company recognized approximately $1.9 million and $0.2 million, respectively, of interest and penalties in income tax expenses. As of December 31, 2013 and December 31, 2012, the Company had approximately $1.5 million and $7.1 million of accrued interest and penalties related to uncertain tax positions, respectively.
The Company files U.S. federal, state, and foreign income tax returns in jurisdictions with varying statutes of limitations during which such tax returns may be audited and adjusted by the relevant tax authorities. The U.S. Internal Revenue Service has concluded its audit for the 2008 and 2009 tax years. In addition, the statute of limitations on the Company's 2008 and 2009 U.S. corporate income tax return expired in September 2013 and, as a result, in 2013, the Company released $39.0 million of tax reserves, including accrued interests and penalties, for those tax years. The 2010 through 2012 tax years generally remain subject to examination by U.S. federal and most state tax authorities. In significant foreign jurisdictions, the 2006 through 2012 tax years generally remain subject to examination by their respective tax authorities. In 2013, the Israeli tax authority concluded its audit of a subsidiary of the Company for the years 2007 through 2011, and a final settlement was made with the Israeli tax authority. The settlement did not have a material impact on the Company's overall tax expense, deferred tax assets realization, effective tax rate, operating results or cash flow.
The Company will continue to review its tax positions and provide for, or reverse, unrecognized tax benefits as issues arise. As of December 31, 2013, the Company anticipates that the balance of gross unrecognized tax benefits will decrease up to approximately $10 million due to expiration of the applicable statutes of limitations over the next 12 months.
The Company's operations in Switzerland is subject to a reduced tax rate under the Switzerland tax holiday which requires various thresholds of investment and employment in Switzerland. The Company has met these various thresholds and the Switzerland tax holiday is effective through the end of 2018. The income tax benefits attributable to the Switzerland holiday were estimated to be approximately $1.5 million, $1.1 million and $0.7 million in 2013, 2012 and 2011, respectively, increasing diluted earnings per share by approximately $0.014, $0.009 and $0.006 in 2013, 2012 and 2011, respectively.

Net_Income_Loss_Per_Share

Net Income (Loss) Per Share	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Net Income (Loss) Per Share	'
	NET INCOME (LOSS) PER SHARE
	Basic net income (loss) per share is computed by dividing the net income (loss) attributable to common stockholders for the applicable period by the weighted average number of common shares outstanding during the period. In the years ended December 31, 2013, 2012 and 2011, there were 6,890,820, 14,136,804 and 14,770,995, respectively, of potentially dilutive shares, consisting of options, restricted stock units and employee stock purchase plan awards, excluded from the net income (loss) per share computations because their effect was anti-dilutive.
	The following table presents the calculation of basic and diluted net income per share (in thousands, except per share amounts):
		December 31,
		2013		2012			2011
	Numerator:
	Income (loss) from continuing operations	$	21,589	$	(16,189	)	$	2,018
	Income (loss) from discontinued operations	15,438		5,252			6,761
	Net income (loss)	$	37,027	$	(10,937	)	$	8,779
	Denominator:
	Weighted average shares outstanding
	Basic	106,529		116,457			115,175
	Effect of dilutive securities from stock options, restricted stock units and ESPP	1,279		—			1,252
	Diluted	107,808		116,457			116,427
	Basic net income (loss) per share from:
	Continuing operations	$	0.2	$	(0.14	)	$	0.02
	Discontinued operations	$	0.14	$	0.05		$	0.06
	Net income (loss)	$	0.35	$	(0.09	)	$	0.08
	Diluted net income (loss) per share from:
	Continuing operations	$	0.2	$	(0.14	)	$	0.02
	Discontinued operations	$	0.14	$	0.05		$	0.06
	Net income (loss)	$	0.34	$	(0.09	)	$	0.08
	The diluted net loss per share is the same as basic net loss per share for the years ended December 31, 2012 because potential common shares are only considered when their effect would be dilutive.

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	SEGMENT INFORMATION
	The Company operates its business in one reportable segment, which is the design, manufacture and sale of versatile and high performance video infrastructure products and system solutions. Harmonic's products enable its customers to efficiently create, prepare and deliver a full range of video services, including televisions, personal computers, laptops, tablets and smart phones. Operating segments are defined as components of an enterprise that engage in business activities for which separate financial information is available and evaluated by the chief operating decision maker in deciding how to allocate resources and assessing performance. The chief operating decision maker is the Company’s Chief Executive Officer.
	The Company’s revenue by product type is summarized as follows (in thousands):
		Year ended December 31,
		2013		2012		2011
	Video processing products	$	219,667	$	219,441	$	236,567
	Production and playout products	87,799		90,246		98,842
	Cable edge products	69,132		86,637		85,679
	Service and support	85,342		80,547		69,786
	Total revenues	$	461,940	$	476,871	$	490,874
	Our revenue by geographic region, based on the location at which each sale originates, and our property and equipment, net by geographic region, is summarized as follows (in thousands):
		Year ended December 31,
		2013		2012		2011
	Net revenue:
	United States	$	199,790	$	208,874	$	224,980
	International	262,150		267,997		265,894
	Total	$	461,940	$	476,871	$	490,874
		As of December 31,
		2013		2012
	Property and equipment, net:
	United States	$	26,550	$	30,477
	Israel	5,057		4,230
	All other	3,338		3,415
	Total	$	34,945	$	38,122

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	COMMITMENTS AND CONTINGENCIES
	Leases
	Harmonic leases its facilities under non-cancelable operating leases which expire at various dates through May 2022. In addition, Harmonic leases vehicles and phones in Israel under non-cancelable operating leases, the last of which expires in 2016. Total rent expense related to these operating leases was $9.6 million, $7.1 million and $7.1 million for the years ended December 31, 2013, 2012 and 2011, respectively. Future minimum lease payments under non-cancelable operating leases at December 31, 2013, are as follows (in thousands):
		Operating Leases
	Year ending December 31,
	2014	$	9,803
	2015	9,327
	2016	8,087
	2017	7,676
	2018	7,620
	Thereafter	13,574
	Total minimum payments	$	56,087
	The Company accrues for estimated warranty costs at the time of product shipment. Management periodically reviews the estimated fair value of its warranty liability and records adjustments based on the terms of warranties provided to customers, historical and anticipated warranty claims experience, and estimates of the timing and cost of warranty claims. Activity for the Company’s warranty accrual, which is included in accrued liabilities, is summarized below (in thousands):
		Year ended December 31,
		2013			2012			2011
	Balance at beginning of period	$	4,292		$	5,558		$	4,811
	Transfer to Aurora as part of the sale of discontinued operations	(939		)	—			—
	Accrual for current period warranties	7,158			5,798			8,245
	Warranty costs incurred	(6,905		)	(7,064		)	(7,498		)
	Balance at end of period	$	3,606		$	4,292		$	5,558
	Standby Letters of Credit
	As of December 31, 2013, the Company’s financial guarantees consisted of standby letters of credit outstanding, which were principally related to performance bonds and state requirements imposed on employers. The maximum amount of potential future payments under these arrangements was $0.2 million as of December 31, 2013.
	Indemnification
	Harmonic is obligated to indemnify its officers and the members of its Board pursuant to its bylaws and contractual indemnity agreements. Harmonic also indemnifies some of its suppliers and most of its customers for specified intellectual property matters pursuant to certain contractual arrangements, subject to certain limitations. The scope of these indemnities varies, but, in some instances, includes indemnification for damages and expenses (including reasonable attorneys’ fees). There have been no amounts accrued in respect of the indemnification provisions through December 31, 2013.
	Guarantees
	The Company has $0.5 million of guarantees in Israel, with the majority related to rent, as of December 31, 2013.
	Royalties
	Harmonic has licensed certain technologies from various companies. It incorporates these technologies into its own products and is required to pay royalties for such use, usually based on shipment of the related products. In addition, Harmonic has obtained research and development grants under various Israeli government programs that require the payment of royalties on sales of certain products resulting from such research. During the years ended December 31, 2013, 2012 and 2011 royalty expenses were $4.4 million, $3.0 million and $2.4 million, respectively, and they are included in product cost of revenue in the Company's Consolidated Statements of Operations.
	Purchase Commitments with Contract Manufacturers and Vendors
	The Company relies on a limited number of contract manufacturers and suppliers to provide manufacturing services for a substantial majority of its products. In addition, some components, sub-assemblies and modules are obtained from a sole supplier or limited group of suppliers. During the normal course of business, in order to reduce manufacturing lead times and ensure adequate component supply, the Company enters into agreements with certain contract manufacturers and suppliers that allow them to procure inventory and services based upon criteria as defined by the Company. The Company had $16.8 million of non-cancelable purchase commitments as of December 31, 2013.

Legal_Proceedings

Legal Proceedings	12 Months Ended
	Dec. 31, 2013
Loss Contingency [Abstract]	'
Legal Proceedings	'
	LEGAL PROCEEDINGS
	From time to time, the Company is involved in lawsuits as well as subject to various legal proceedings, claims, threats of litigation, and investigations in the ordinary course of business, including claims of alleged infringement of third-party patents and other intellectual property rights, commercial, employment, and other matters. The Company assesses potential liabilities in connection with each lawsuit and threatened lawsuits and accrues an estimated loss for these loss contingencies if both of the following conditions are met: information available prior to issuance of the financial statements indicates that it is probable that a liability has been incurred at the date of the financial statements and the amount of loss can be reasonably estimated. While certain matters to which the Company is a party specify the damages claimed, such claims may not represent reasonably possible losses. Given the inherent uncertainties of litigation, the ultimate outcome of these matters cannot be predicted at this time, nor can the amount of possible loss or range of loss, if any, be reasonably estimated.
	In October 2011, Avid Technology, Inc. (“Avid”) filed a complaint in the United States District Court for the District of Delaware alleging that Harmonic’s Media Grid product infringes two patents held by Avid. A jury trial on this complaint commenced on January 23, 2014 and, on February 4, 2014, the jury returned a unanimous verdict in favor of Harmonic, rejecting Avid's infringement allegations in their entirety.
	In June 2012, Avid served a subsequent complaint alleging that Harmonic’s Spectrum product infringes one patent held by Avid. The complaint seeks injunctive relief and unspecified damages. In September 2013, the U.S. Patent Trial and Appeal Board authorized an inter partes review to be instituted as to claims of the patent asserted in this second complaint.
	In November 2012, FastVDO served a lawsuit on Harmonic, alleging infringement of a patent allegedly essential to the H.264 standard and that Harmonic encoders, transcoders, software and servers that use H.264 infringe their patent. The complaints sought injunctive relief and unspecified damages. In December 2013, this matter was settled on terms immaterial to the Company and the action was dismissed.
	In April 2010, Arris Corporation filed a complaint in the United States District Court in Atlanta, alleging that the Company’s Streamliner 3000 product infringes four patents held by Arris. The complaint sought injunctive relief and damages. In connection with this matter, the Company recorded a $1.3 million liability in the fourth quarter of 2010, based on a tentative agreement of Arris and Harmonic with respect to the settlement of the action. In April 2011, this matter was settled on essentially the same terms as the tentative agreement and the action was dismissed.
	In March 2010, Interkey ELC Ltd, or Interkey, filed a lawsuit in Israel, alleging breach of contract against Harmonic and Scopus Video Networks Ltd. (now Harmonic Video Networks Ltd. or “HVN”), which was acquired by Harmonic in March 2009. The plaintiffs were seeking damages in the amount of 6,300,000 ILS (approximately $1.7 million). On June 26, 2012, the action was dismissed by the Israeli Central District Court.
	An unfavorable outcome on any litigation matter could require that Harmonic pay substantial damages, or, in connection with any intellectual property infringement claims, could require that the Company pay ongoing royalty payments or could prevent the Company from selling certain of its products. As a result, a settlement of, or an unfavorable outcome on, any of the matters referenced above or other litigation matters could have a material adverse effect on Harmonic’s business, operating results, financial position and cash flows.

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Data [Abstract]	'
Selected Quarterly Financial Data	'
	SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
	The following table sets forth our unaudited quarterly Consolidated Statement of Operations data for each of the eight quarters ended December 31, 2013. In management’s opinion, the data has been prepared on the same basis as the audited Consolidated Financial Statements included in this report, and reflects all necessary adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of this data.
		Fiscal 2013
		1st Quarter			2nd Quarter			3rd Quarter			4th Quarter
		(In thousands, except per share amounts)
	Quarterly Data:
	Net revenue	$	101,672		$	117,128		$	122,918		$	120,222
	Gross profit	46,165			57,892			56,792			59,596
	Income (loss) from continuing operations, net of tax	(9,503		)	(3,404		)	36,675			(2,179		)
	Income (loss) from discontinued operations, net of tax	15,924			(396		)	91			(181		)
	Net income (loss)	$	6,421		$	(3,800	)	$	36,766		$	(2,360	)
	Basic net income (loss) per share:
	Continuing operations	$	(0.08	)	$	(0.03	)	$	0.36		$	(0.02	)
	Discontinued operations	$	0.14		$	0		$	0		$	0
	Net income (loss)	$	0.06		$	(0.03	)	$	0.36		$	(0.02	)
	Diluted net income (loss) per share:
	Continuing operations	$	(0.08	)	$	(0.03	)	$	0.36		$	(0.02	)
	Discontinued operations	$	0.14		$	0		$	0		$	0
	Net income (loss)	$	0.06		$	(0.03	)	$	0.36		$	(0.02	)
	Shares used in per share calculations:
	Basic	115,219			109,938			101,144			100,372
	Diluted	115,219			109,938			102,723			100,372
		Fiscal 2012
		1st Quarter			2nd Quarter			3rd Quarter			4th Quarter
		(In thousands, except per share amounts)
	Quarterly Data:
	Net revenue	$	116,439		$	122,060		$	120,391		$	117,981
	Gross profit	50,462			55,081			54,878			60,111
	Income (loss) from continuing operations, net of tax	(8,735		)	(3,875		)	(4,469		)	890
	Income (loss) from discontinued operations, net of tax	1,207			3,892			(3,761		)	3,914
	Net income (loss)	$	(7,528	)	$	17		$	(8,230	)	$	4,804
	Basic net income (loss) per share:
	Continuing operations	$	(0.07	)	$	(0.03	)	$	(0.04	)	$	0.01
	Discontinued operations	$	0.01		$	0.03		$	(0.03	)	$	0.03
	Net income (loss)	$	(0.06	)	$	0		$	(0.07	)	$	0.04
	Diluted net income (loss) per share:
	Continuing operations	$	(0.07	)	$	(0.03	)	$	(0.04	)	$	0.01
	Discontinued operations	$	0.01		$	0.03		$	(0.03	)	$	0.03
	Net income (loss)	$	(0.06	)	$	0		$	(0.07	)	$	0.04
	Shares used in per share calculations:
	Basic	117,275			117,056			116,517			115,097
	Diluted	117,275			117,056			116,517			115,732

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	The accompanying consolidated financial statements of Harmonic include the accounts of the Company and its subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. The Company’s fiscal quarters are based on 13-week periods, except for the fourth quarter which ends on December 31.
Discontinued Operations	'
	Discontinued Operations
	On March 5, 2013, the Company completed the sale of its cable access HFC business to Aurora Networks (“Aurora”) for $46.0 million in cash. The Consolidated Statements of Operations have been retrospectively adjusted to present the cable access HFC business as discontinued operations, as described in Note 3, "Discontinued Operations”. Unless noted otherwise, all discussions herein with respect to the Company’s audited consolidated financial statements relate to the Company’s continuing operations.
	In accordance with ASC 205 “Presentation of financial statements – Discontinued Operations”, a business is classified as a discontinued operation when: (i) the operations and cash flows of the business can be clearly distinguished and have been or will be eliminated from our ongoing operations; (ii) the business has either been disposed of or is classified as held for sale; and (iii) the Company will not have any significant continuing involvement in the operations of the business after the disposal transactions.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Reclassifications	'
	Reclassifications
	From time to time the Company reclassifies certain period balances to conform to the current year presentation. These reclassifications have no material impact on previously reported total assets, total liabilities, stockholders’ equity, results of operations or cash flows.
Foreign Currency	'
	Foreign Currency
	The functional currency of the Company’s Israeli, Cayman and Swiss operations is the U.S. dollar. All other foreign subsidiaries use the respective local currency as the functional currency. When the local currency is the functional currency, gains and losses from translation of these foreign currency financial statements into U.S. dollars are recorded as a separate component of other comprehensive loss in stockholders’ equity.
	For subsidiaries where the functional currency is the U.S. dollar, monetary assets and liabilities denominated in currencies other than the U.S. dollar are remeasured into U.S. dollars using exchange rates prevailing on the balance sheet date. The remeasurement gains and losses are included in other income (expense), net in the Company’s Consolidated Statements of Operations. The Company recorded remeasurement losses of $0.5 million, $0.7 million, and $0.7 million for the years ended December 31, 2013, 2012 and 2011, respectively.
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments
	The carrying value of Harmonic’s financial instruments, including cash equivalents, short-term investments, accounts receivable, accounts payable and accrued liabilities, approximate fair value due to their short maturities.
	The applicable accounting guidance establishes a framework for measuring fair value and requires disclosure about the fair value measurements of assets and liabilities. This guidance requires the Company to classify and disclose assets and liabilities measured at fair value on a recurring basis, as well as fair value measurements of assets and liabilities measured on a nonrecurring basis in periods subsequent to initial measurement, in a three-tier fair value hierarchy as described below.
	The guidance defines fair value as the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.
	Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The guidance describes three levels of inputs that may be used to measure fair value:
	•	Level 1 — Observable inputs that reflect quoted prices for identical assets or liabilities in active markets.
	•	Level 2 — Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company primarily uses broker quotes for valuation of its short-term investments. The forward exchange contracts are classified as Level 2 because they are valued using quoted market prices and other observable data for similar instruments in an active market.
	•	Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	The Company uses the market approach to measure fair value for its financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. During the years ended December 31, 2013, 2012, and 2011 there were no nonrecurring fair value measurements of assets and liabilities subsequent to initial recognition.
Derivative Instruments	'
	Derivative Instruments
	The Company enters into foreign currency forward exchange contracts to minimize the short-term impact of foreign currency exchange rate fluctuations on cash and certain trade and inter-company receivables and payables. The Company does not enter into forward currency forward contracts for trading purposes. These derivative instruments generally have maturities between one to three months. The Company does not designate these forward currency forward exchange contracts as hedging instruments.
	According to the applicable accounting guidance, the assets or liabilities associated with the forward exchange contracts are recorded at fair value in prepaid expenses and other current assets or accrued liabilities in the Company's Consolidated Balance Sheet. Gains or losses resulting from changes in fair value on forward exchange contracts are recognized in earnings monthly and are included in other income (expense), net in the Company's Consolidated Statements of Operations.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	Cash and cash equivalents include all cash and highly liquid investments with maturities of three months or less at the date of purchase. The carrying amount of cash and cash equivalents approximates fair value because of the short maturity of those instruments.
Short-Term Investments	'
	Short-Term Investments
	Harmonic’s short-term investments, which are classified as available-for-sale securities are principally comprised of U.S. federal government bonds, state, municipal and local government agencies bonds, corporate bonds, commercial paper and certificates of deposit, with a final maturity of twenty-four months or less from the date of purchase. Short-term investments are stated at fair value, with unrealized gains and losses reported in accumulated other comprehensive income (loss) in the Consolidated Balance Sheet. The specific identification method is used to determine the cost of securities disposed of, with realized gains and losses reflected in other income (expense), net in the Company’s Consolidated Statements of Operations. Investments are anticipated to be used for current operations and are, therefore, classified as current assets even though maturities may extend beyond one year. The Company monitors its investment portfolio for impairment on a periodic basis. In the event a decline in value is determined to be other than temporary, an impairment charge is recorded. The Company considers current market conditions, as well as the likelihood that it would need to sell its investments prior to a recovery of par value, when determining if a loss is other than temporary.
	The Company monitors its investment portfolio for impairment on a periodic basis. In the event that the carrying value of an investment exceeds its fair value and the decline in value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis for the investment is established. A decline of fair value below amortized costs of debt securities is considered other-than temporary if the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of the entire amortized cost basis. At the present time, the Company does not intend to sell its investments that have unrealized losses in accumulated other comprehensive loss. In addition, the Company does not believe that it is more likely than not that it will be required to sell its investments that have unrealized losses in accumulated other comprehensive loss before the Company recovers the principal amounts invested. The Company believes that the unrealized losses are temporary and do not require an other-than-temporary impairment, based on its evaluation of available evidence as of December 31, 2013.
Concentrations of Credit Risk/Major Customers/Supplier Concentration	'
	Concentrations of Credit Risk/Major Customers/Supplier Concentration
	Financial instruments which subject Harmonic to concentrations of credit risk consist primarily of cash, cash equivalents, short-term investments and accounts receivable. Cash, cash equivalents and short-term investments are invested in short-term, highly liquid, investment-grade obligations of commercial or governmental issuers, in accordance with Harmonic’s investment policy. The investment policy limits the amount of credit exposure to any one financial institution, commercial or governmental issuer. Harmonic’s accounts receivable are derived from sales to cable, satellite, telco, broadcast and other media companies. Harmonic generally does not require collateral from its customers, and performs ongoing credit evaluations of its customers and provides for expected losses. Harmonic maintains an allowance for doubtful accounts based upon the expected collectability of its accounts receivable. No customers had a balance greater than 10% of the Company’s net accounts receivable balance as of December 31, 2013 and 2012. In the years ended December 31, 2013, 2012 and 2011, sales to Comcast accounted for 12%, 11% and 10%, respectively, of net revenue.
	Certain of the components and subassemblies included in the Company’s products are obtained from a single source or a limited group of suppliers. Although the Company seeks to reduce dependence on those sole source and limited source suppliers, the partial or complete loss of certain of these sources could have at least a temporary adverse effect on the Company’s results of operations and damage customer relationships.
Revenue Recognition	'
	Revenue Recognition
	Harmonic’s principal sources of revenue are from the sale of hardware, software, hardware and software maintenance contracts, and end-to-end solutions, encompassing design, manufacture, test, integration and installation of products. Harmonic recognizes revenue when persuasive evidence of an arrangement exists, delivery has occurred or services have been provided, the sale price is fixed or determinable, and collectability is reasonably assured.
	Revenue from the sale of hardware and software products is recognized when risk of loss and title have transferred. For most of the Company’s product sales, these criteria are met at the time the product is shipped or delivery has occurred. Revenue from distributors and system integrators is recognized on delivery of the related products, provided all other revenue recognition criteria have been met. The Company’s agreements with these distributors and system integrators have terms which are generally consistent with the standard terms and conditions for the sale of the Company’s equipment to end users, and do not provide for product rotation or pricing allowances, as are typically found in agreements with stocking distributors. The Company accrues for sales returns and other allowances based on its historical experience.
	Deferred revenue includes billings in excess of revenue recognized, net of deferred cost of revenue, and invoiced amounts remain deferred until applicable revenue recognition criteria are met.
	Shipping and handling costs incurred for inventory purchases and product shipments are recorded in cost of revenue in the Company’s Consolidated Statements of Operations. Costs associated with services are generally recognized as incurred.
	The Company recognizes revenue from the sale of hardware products and software bundled with hardware that is essential to the functionality of the hardware in accordance with applicable revenue recognition accounting guidance. For the sale of stand-alone software products, bundled with hardware but not essential to the functionality of the hardware, revenue is allocated between the hardware, including essential software and related elements, and the non-essential software and related elements. Revenue for the hardware and essential software elements are recognized under the relative allocation method. Revenue for the non-essential software and related elements are recognized under the residual method in accordance with software accounting guidance. Revenue associated with service and maintenance agreements is recognized on a straight-line basis over the period in which the services are performed, generally one year. The Company recognizes revenue associated with solution sales using the percentage of completion or completed contract methods of accounting. Further details of these accounting policies are described below.
Multiple Element Arrangements	'
	Multiple Element Arrangements. The Company has revenue arrangements that include hardware and software essential to the hardware product’s functionality, and non-essential software, services and support. For transactions originating or materially modified, beginning January 1, 2011, the Company has applied the accounting guidance that requires the Company to allocate revenue to all deliverables based on their relative selling prices. For transactions originating prior to January 1, 2011, the Company applied software revenue recognition accounting guidance, as described in the “Software” section below. The Company determines the relative selling prices by first considering vendor-specific objective evidence of fair value (“VSOE”), if it exists; otherwise third-party evidence (“TPE”) of the selling price is used. If neither VSOE nor TPE exists for a deliverable, the Company uses a best estimate of the selling price (“BESP”) for that deliverable. Once revenue is allocated to all deliverables based on their relative selling prices, revenue related to hardware elements (hardware, essential software and related services) are recognized using a relative selling price allocation and non-essential software and related services are recognized under the residual method.
	Harmonic has established VSOE for certain elements of its arrangements based on either historical stand-alone sales to third parties or stated renewal rates for maintenance. The Company has VSOE of fair value for maintenance, training and certain professional services.
	TPE is determined based on competitor prices for similar deliverables when sold separately. The Company is typically not able to determine TPE for competitors’ products or services. Generally, the Company’s go-to-market strategy differs from that of its competitors’ and the Company’s offerings contain a significant level of differentiation, such that the comparable pricing of products with similar functionality cannot be obtained. Furthermore, the Company is unable to reliably determine what competitor similar products’ selling prices are on a stand-alone basis.
	When the Company is unable to establish fair value of non-software deliverables using VSOE or TPE, the Company uses BESP in its allocation of arrangement consideration. The objective of using BESP is to determine the price at which the Company would transact a sale if the product or service were sold on a stand-alone basis. The Company determines BESP for a product or service by considering multiple factors, including, but not limited to, pricing practices, market conditions, competitive landscape, internal costs, geographies and gross margin. The determination of BESP is made through consultation with Company’s management, taking into consideration the Company’s go-to-market strategy.
Software	'
	Software. Sales of stand-alone software that are not considered essential to the functionality of the hardware continue to be subject to the software revenue recognition guidance. Further, the Company also applied the software revenue recognition guidance to its multiple element arrangements for transactions originating prior to January 1, 2011.
	In accordance with the software revenue recognition guidance, the Company applies the residual method to recognize revenue for the delivered elements in stand-alone software transactions. Under the residual method, the amount of revenue allocated to delivered elements equals the total arrangement consideration, less the aggregate fair value of any undelivered elements, typically maintenance, provided that vendor specific objective evidence ("VSOE") of fair value exists for all undelivered elements. VSOE of fair value is based on the price charged when the element is sold separately or, in the case of maintenance, substantive renewal rates for maintenance.
Solution Sales	'
	Solution Sales. Solution sales for the design, manufacture, test, integration and installation of products, including equipment acquired from third parties to be integrated with Harmonic’s products, that are customized to meet the customer’s specifications are accounted for in accordance with applicable guidance on accounting for performance of construction/production contracts. Accordingly, for each arrangement that the Company enters into that includes both products and services, the Company performs a detailed evaluation to determine whether the arrangement should be accounted for under guidance for construction/production contracts or, alternatively, for arrangements that do not involve significant production, modification or customization, under other applicable accounting guidance. The Company has a long-standing history of entering into contractual arrangements to deliver the solution sales described.
	At the outset of each arrangement accounted for as a single arrangement, the Company develops a detailed project plan and associated labor hour estimates for each project. The Company believes that, based on its historical experience, it has the ability to make labor cost estimates that are sufficiently dependable to justify the use of the percentage-of-completion method of accounting and, accordingly, utilizes percentage-of-completion accounting for most arrangements that are determined to be single arrangements. Under the percentage-of-completion method, revenue recognized reflects the portion of the anticipated contract revenue that has been earned, equal to the ratio of actual labor hours expended to total estimated labor hours to complete the project. Costs are recognized proportionally to the labor hours incurred. For contracts that include customized services for which labor costs are not reasonably estimable, the Company uses the completed contract method of accounting. Under the completed contract method, 100% of the contract’s revenue and cost is recognized upon the completion of all services under the contract. If the estimated costs to complete a project exceed the total contract amount, indicating a loss, the entire anticipated loss is recognized.
Inventories	'
	Inventories
	Inventories are stated at the lower of cost, using the weighted average method (which approximates the first-in, first-out basis), or market. The cost of inventories is comprised of material, labor and manufacturing overhead. The Company's manufacturing overhead standards for product costs are calculated assuming full absorption of forecasted spending over projected volumes. Harmonic establishes provisions for excess and obsolete inventories to reduce such inventories to their estimated net realizable value after evaluation of historical sales, future demand and market conditions, expected product life cycles and current inventory levels. Such provisions are charged to cost of revenue in the Company’s Consolidated Statements of Operations.
Capitalized Software Development Costs	'
	Capitalized Software Development Costs
	Costs related to research and development are generally charged to expense as incurred. Capitalization of material software development costs begins when a product’s technological feasibility has been established. To date, the time period between achieving technological feasibility, which the Company has defined as the establishment of a working model, which typically occurs when beta testing commences, and the general availability of such software has been short, and, as such, software development costs qualifying for capitalization have been insignificant.
	The Company incurs costs associated with developing software for internal use and for which no plan exists to market the software externally. The Company capitalizes the costs as part of property and equipment and recognizes the associated depreciation over a useful life of generally three years. In the years ended December 31, 2013, 2012 and 2011, the Company capitalized $1.4 million, $0.8 million and $1.1 million, respectively, in internal use software development costs.
Property and Equipment	'
	Property and Equipment
	Property and equipment are recorded at cost. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the assets. Estimated useful lives are five years for furniture and fixtures, three years for software developed for internal use and typically four years for machinery and equipment. Depreciation and amortization for leasehold improvements are computed using the shorter of the remaining useful lives of the assets, up to ten years, or the lease term of the respective assets.
Goodwill	'
	Goodwill
	Goodwill represents the difference between the purchase price and the estimated fair value of the identifiable assets acquired and liabilities assumed. The Company tests for impairment of goodwill on an annual basis in the fourth quarter of each of its fiscal years at the Company level, which is the sole reporting unit, and at any other time at which events occur or circumstances indicate that the carrying amount of goodwill may exceed its fair value. When assessing the goodwill for impairment, the Company considers its market capitalization adjusted for a control premium and, if necessary, the Company’s discounted cash flow model, which involves significant assumptions and estimates, including the Company’s future financial performance, the Company’s weighted average cost of capital and the Company’s interpretation of currently enacted tax laws. Circumstances that could indicate impairment and require the Company to perform an impairment test include: a significant decline in the financial results of the Company’s operations; the Company’s market capitalization relative to net book value; unanticipated changes in competition and the Company’s market share; significant changes in the Company’s strategic plans; or adverse actions by regulators.
	There was no impairment of goodwill resulting from the Company’s annual impairment testing in the fourth quarter of 2013. See Note 4, “Goodwill and Identified Intangible Assets” for additional information.
Long-lived Assets	'
	Long-lived Assets
	Long-lived assets represent property and equipment and purchased intangible assets. Purchased intangible assets from business combinations and asset acquisitions include customer contracts, trademarks and tradenames, and maintenance agreements and related relationships, the amortization of which is charged to general and administrative expenses, and core technology and developed technology, the amortization of which is charged to cost of revenue. The Company evaluates the recoverability of intangible assets and other long-lived assets when indicators of impairment are present. When impairment indicators are present, the Company evaluates the recoverability of intangible assets and other long-lived assets on the basis of undiscounted cash flows from each asset group. If impairment is indicated, provisions for impairment are determined based on fair value, principally using discounted cash flows. This evaluation involves significant assumptions and estimates, including the Company’s future financial performance, the Company’s weighted average cost of capital and the Company’s interpretation of currently enacted tax laws. Circumstances that could indicate impairment and require the Company to perform an impairment test include: a significant decline in the cash flows of such asset or asset group; unanticipated changes in competition and the Company’s market share; significant changes in the Company’s strategic plans; or exiting an activity resulting from a restructuring of operations. See Note 4, “Goodwill and Identified Intangible Assets” for additional information.
Restructuring Costs and Accruals for Excess Facilities	'
	Restructuring and Related Charges
	The Company's restructuring charges consist of employee severance, one-time termination benefits related to the reduction of its workforce, lease exit costs, and other costs. Liabilities for costs associated with a restructuring activity are recognized when the liability is incurred and are measured at fair value. One-time termination benefits are expensed at the date the entity notifies the employee, unless the employee must provide future service, in which case the benefits are expensed ratably over the future service period. Termination benefits are calculated based on regional benefit practices and local statutory requirements. Costs to terminate a lease before the end of its term are recognized when the entity terminates the contract in accordance with the contract terms. The Company determines the excess facilities accrual based on expected cash payments, under the applicable facility lease, reduced by any estimated sublease rental income for such facility. Other costs primarily consist of costs to write down the values of inventories and leasehold improvement write-down as a result of restructuring activities. See Note 9, “Restructuring Charges” for additional information.
Warranty	'
	Warranty
	The Company accrues for estimated warranty costs at the time of revenue recognition and records such accrued liabilities as part of cost of revenue. Management periodically reviews its warranty liability and adjusts the accrued liability based on the terms of warranties provided to customers, historical and anticipated warranty claims experience, and estimates of the timing and cost of warranty claims.
	The Company accrues for estimated warranty costs at the time of product shipment. Management periodically reviews the estimated fair value of its warranty liability and records adjustments based on the terms of warranties provided to customers, historical and anticipated warranty claims experience, and estimates of the timing and cost of warranty claims.
Advertising Expenses	'
	Advertising Expenses
	The Company expenses all advertising costs as incurred. Advertising expense was $0.4 million, $0.5 million and $0.8 million for the years ended December 31, 2013, 2012 and 2011, respectively.
Stock-based Compensation Expense	'
	Stock-based Compensation Expense
	Harmonic measures and recognizes compensation expense for all stock-based compensation awards made to employees and directors, including stock options, restricted stock units and awards related to our Employee Stock Purchase Plan (“ESPP”), based upon the grant-date fair value of those awards.
	Applicable accounting guidance requires companies to estimate the fair value of stock-based compensation awards on the date of grant. The value of the portion of the award that is ultimately expected to vest is recognized as expense over the requisite service period in the Company’s Consolidated Statements of Operations.
	The fair value of stock options is estimated at grant date using the Black-Scholes option pricing model. The Company’s determination of fair value of stock options on the date of grant, using an option pricing model, is affected by the Company’s stock price, as well as the assumptions regarding a number of highly complex and subjective variables. These variables include, but are not limited to, the Company’s expected stock price volatility over the term of the awards and projected employee stock option exercise behaviors. The fair value of each restricted stock unit grant is based on the underlying value of the Company’s common stock on the date of grant.
	Employee Stock Purchase Plan
	The value of the stock purchase right under the ESPP consists of (1) the 15% discount on the purchase of the stock, (2) 85% of the fair value of the call option, and (3) 15% of the fair value of the put option. The call option and put option were valued using the Black-Scholes option pricing model with the following assumptions:
		Employee Stock Purchase Plan
		2013		2012		2011
	Expected term (in years)	0.5		0.5		0.5
	Volatility	31	%	49	%	45	%
	Risk-free interest rate	0.2	%	0.2	%	0.2	%
	Dividend yield	0	%	0	%	0	%
	The expected term represents the period of time from the beginning of the offering period to the purchase date. The Company uses its historical volatility for a period equivalent to the expected term of the options to estimate the expected volatility. The risk-free interest rate that the Company uses in the Black-Scholes option valuation model is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term. The Company has never declared or paid any cash dividends and does not plan to pay cash dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model.
	Stock Options
	The Company estimated the fair value of all employee stock options using a Black-Scholes valuation model with the following weighted average assumptions:
		Employee Stock Options
		2013		2012		2011
	Expected term (in years)	4.7		4.7		4.75
	Volatility	50	%	56	%	55	%
	Risk-free interest rate	0.9	%	0.9	%	1.8	%
	Dividend yield	0	%	0	%	0	%
	The expected term represents the weighted-average period that the stock options are expected to remain outstanding. The computation of expected term was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and expectations of future employee behavior. The Company uses its historical volatility for a period equivalent to the expected term of the options to estimate the expected volatility. The risk-free interest rate that the Company uses in the Black-Scholes option valuation model is based on U.S. Treasury zero-coupon issues with remaining terms similar to the expected term. The Company has never declared or paid any cash dividends and does not plan to pay cash dividends in the foreseeable future, and, therefore, used an expected dividend yield of zero in the valuation model.
	The Company is required to estimate forfeitures at the time of grant and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical data to estimate pre-vesting option forfeitures and records stock-based compensation expense only for those awards that are expected to vest. All stock-based payment awards are amortized on a straight-line basis over the requisite service periods of the awards, which are generally the vesting periods.
Income Taxes	'
	Income Taxes
	In preparing the Company’s financial statements, the Company estimates the income taxes for each of the jurisdictions in which the Company operates. This involves estimating the Company’s actual current tax exposures and assessing temporary and permanent differences resulting from differing treatment of items, such as reserves and accruals, for tax and accounting purposes.
	The Company’s income tax policy is to record the estimated future tax effects of temporary differences between the tax bases of assets and liabilities and amounts reported in the Company’s accompanying Consolidated Balance Sheets, as well as operating loss and tax credit carryforwards. The Company follows the guidelines set forth in the applicable accounting guidance regarding the recoverability of any tax assets recorded on the Consolidated Balance Sheet and provides any necessary allowances as required. Determining necessary allowances requires the Company to make assessments about the timing of future events, including the probability of expected future taxable income and available tax planning opportunities.
	The Company is subject to examination of its income tax returns by various tax authorities on a periodic basis. The Company regularly assesses the likelihood of adverse outcomes resulting from such examinations to determine the adequacy of its provision for income taxes. The Company has applied the provisions of the applicable accounting guidance on accounting for uncertainty in income taxes, which requires application of a more-likely-than-not threshold to the recognition and de-recognition of uncertain tax positions. If the recognition threshold is met, the applicable accounting guidance permits the Company to recognize a tax benefit measured at the largest amount of tax benefit that, in the Company’s judgment, is more than 50 percent likely to be realized upon settlement. It further requires that a change in judgment related to the expected ultimate resolution of uncertain tax positions be recognized in earnings in the period of such change.
	The Company files annual income tax returns in multiple taxing jurisdictions around the world. A number of years may elapse before an uncertain tax position is audited and finally resolved. While it is often difficult to predict the final outcome or the timing of resolution of any particular uncertain tax position, the Company believes that its reserves for income taxes reflect the most likely outcome. The Company adjusts these reserves and penalties, as well as the related interest, in light of changing facts and circumstances. Changes in the Company’s assessment of its uncertain tax positions or settlement of any particular position could materially and adversely impact the Company’s income tax rate, operating results, financial position and cash flows.
	The Company has not provided U.S. federal and California state income taxes, as well as foreign withholding taxes, on approximately $77.5 million of cumulative undistributed earnings for certain non-U.S. subsidiaries, because such earnings are intended to be indefinitely reinvested. Determination of the amount of unrecognized deferred tax liability for temporary differences related to investment in these non-U.S. subsidiaries that are essentially permanent in duration is not practicable.
	The Company applies the provisions of the applicable accounting guidance regarding accounting for uncertainty in income taxes, which requires application of a more-likely-than-not threshold to the recognition and derecognition of uncertain tax positions. If the recognition threshold is met, the applicable accounting guidance permits the recognition of a tax benefit measured at the largest amount of such tax benefit that, in our judgment, is more than fifty percent likely to be realized upon settlement. It further requires that a change in judgment related to the expected ultimate resolution of uncertain tax positions be recognized in earnings in the period in which such determination is made.
	The Company recognizes interest and penalties related to unrecognized tax positions in income tax expenses.
	Management regularly assesses the ability to realize deferred tax assets recorded based upon the weight of available evidence, including such factors as recent earnings history and expected future taxable income on a jurisdiction by jurisdiction basis. In the event that the Company changes its determination as to the amount of realizable deferred tax assets, the Company will adjust its valuation allowance with a corresponding impact to the provision for income taxes in the period in which such determination is made. As of December 31, 2013, the Company had a valuation allowance of $38.6 million, which primarily relates to foreign net operating losses and a portion of its U.S. California tax credits.
	As of December 31, 2013, the Company had $96.4 million and $85.3 million of foreign and U.S. California state net operating loss carryforwards ("NOL"), respectively. There is no expiration to the utilization of the foreign NOL, while the U.S. California NOL will begin to expire at various dates beginning in 2014 through 2031, if not utilized. As of December 31, 2013, the U.S. California NOL included approximately $8.8 million relating to stock options tax deductions. These amounts are not included in the Company’s gross or net deferred tax assets pursuant to applicable accounting guidance and, if and when realized, through a reduction in income tax payable, will be accounted for as a credit to additional paid-in capital.
Comprehensive Income (Loss)	'
	Comprehensive Income (Loss)
	Comprehensive income (loss) includes net income (loss) and other comprehensive income (loss). Other comprehensive income (loss) includes cumulative translation adjustments and unrealized gains and losses on available-for-sale securities.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In December 2011, the FASB issued Accounting Standard Update (“ASU”) 2011-11, “Disclosures about offsetting assets and liabilities”. This guidance enhances disclosure requirements about the nature of an entity’s right to offset. The new guidance requires the disclosure of the gross amounts subject to rights of offset, amounts offset in accordance with the accounting standards followed, and the related net exposure. The new guidance became effective for the Company beginning in the first quarter of fiscal 2013 and it did not have a material impact on the Company’s Consolidated Financial Statements.
	In July 2012, the FASB issued ASU 2012-2, “Intangibles - Goodwill and Other”, which allows an entity to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived asset is impaired for determining whether it is necessary to perform the quantitative impairment test. This accounting standard update became effective for the Company beginning in the first quarter of fiscal 2013 and did not have any impact on the Company’s Consolidated Financial Statements.
	In February 2013, the FASB issued ASU 2013-2, “Comprehensive Income”, which requires reclassification adjustments from other comprehensive income to be presented either in the financial statements or in the notes to the financial statements. The Company adopted this new guidance in the first quarter of fiscal 2013 and included the required disclosures.
	In March 2013, the FASB issued ASU 2013-5, “Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity”. The ASU addresses accounting for a cumulative translation adjustment when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity. The guidance is effective for the Company beginning in the first quarter of its 2014 fiscal year and should be applied prospectively. The Company does not expect the adoption of ASU 2013-05 will have a material impact on its financial position, results of operations or cash flows.
	In July 2013, the FASB issued ASU 2013-11, “Presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists”. Under certain circumstances, unrecognized tax benefits should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. The Company does not expect the adoption of ASU 2013-11 will have a material impact on its financial position, results of operations or cash flows. The guidance is effective for the Company beginning in the first quarter of its 2014 fiscal year and will be applied prospectively.

Discontinued_Operations_Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]	'
Schedule of Details on Income Statement Caption on TSA Billing	'
	The table below provides details on the income statement caption under which the TSA billing was recorded (in thousands):
		Year ended
		31-Dec-13
	Product cost of revenue	$	577
	Research and development	21
	Selling, general and administrative	379
	Total TSA billing to Aurora	$	977
Recorded Gain With the Sale of Cable Access HFC Business	'
	The Company recorded a gain of $14.7 million for the year ended December 31, 2013, in connection with the sale of the cable access HFC business, calculated as follows (in thousands):
	Gross Proceeds				$	46,000
	Less : Carrying value of net assets
	Inventories, net	$	10,579
	Prepaid expenses and other current assets	612
	Property and equipment, net	1,194
	Goodwill de-recognized	14,547
	Deferred revenue	(4,499		)
	Accrued liabilities	(939		)
	Total net assets sold and de-recognized				$	21,494
	Less : Selling cost				2,485
	Less : Tax effect				7,358
	Gain on disposal, net of tax				$	14,663
Revenues and Components of Net Income Related to Discontinued Operations	'
	The results of operations associated with the cable access HFC business are presented as discontinued operations in the Company’s Consolidated Statements of Operations for all periods presented. Revenue and the components of net income related to the discontinued operations for the years ended December 31, 2013, 2012 and 2011 were as follows (in thousands):
		Year ended December 31
		2013			2012		2011
	Revenue	$	9,717		$	53,593	$	58,458
	Operating income	$	539		$	8,610	$	10,266
	Less : Provision for (benefit from) income taxes	(236		)	3,358		3,505
	Add : Gain on disposal, net of tax	14,663			—		—
	Income from discontinued operations, net of taxes	$	15,438		$	5,252	$	6,761

Goodwill_and_Identified_Intang1

Goodwill and Identified Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Summary of Identified Intangible Assets	'
	The following is a summary of identified intangible assets (in thousands):
				31-Dec-13										31-Dec-12
		Range of Useful Lives		Gross				Accumulated				Net		Gross		Accumulated			Net
				Carrying				Amortization				Carrying		Carrying		Amortization			Carrying
				Amount								Amount		Amount					Amount
	Identifiable intangibles:
	Developed core technology	4-6 years		$	136,145			$	(121,681	)		$	14,464	$	136,145	$	(102,449	)	$	33,696
	Customer relationships/contracts	5-6 years		67,098				(53,772		)		13,326		67,098		(48,150		)	18,948
	Trademarks and tradenames	4-5 years		11,361				(10,565		)		796		11,361		(9,145		)	2,216
	Maintenance agreements and related relationships	6-7 years		7,100				(4,567		)		2,533		7,100		(3,513		)	3,587
	Total identifiable intangibles			$	221,704			$	(190,585	)		$	31,119	$	221,704	$	(163,257	)	$	58,447
Changes in Carrying Amount of Goodwill	'
	The changes in the carrying amount of goodwill for the years ended December 31, 2013 and 2012 are as follows (in thousands):
		December 31,
		2013				2012
	Balance at beginning of period	$	212,518			$	212,417
	Reduction in goodwill associated with the sale of the cable access HFC Business	(14,547		)		—
	Foreign currency translation adjustment	51				101
	Balance at end of period	$	198,022			$	212,518
Estimated Future Amortization Expense of Purchased Intangible Assets	'
	The estimated future amortization expense of purchased intangible assets with definite lives is as follows (in thousands):
		Cost of				Operating				Total
		Revenue				Expenses
	Year ended December 31,
	2014	$	13,745			$	6,775			$	20,520
	2015	719				5,783				6,502
	2016	—				4,097				4,097
	2017	—				—				—
	2018	—				—				—
	Total future amortization expense	$	14,464			$	16,655			$	31,119

ShortTerm_Investments_Tables

Short-Term Investments (Tables)	12 Months Ended
	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'
Summary of Short-Term Investments	'
	The following table summarizes the Company’s short-term investments (in thousands):
		Amortized		Gross		Gross			Estimated
		Cost		Unrealized		Unrealized			Fair Value
				Gains		Losses
	As of December 31, 2013
	State, municipal and local government agencies bonds	$	40,426	$	38	$	(15	)	$	40,449
	Corporate bonds	33,483		20		(7		)	33,496
	Commercial paper	2,299		—		—			2,299
	U.S. federal government bonds	4,004		4		—			4,008
	Total short-term investments	$	80,212	$	62	$	(22	)	$	80,252
	As of December 31, 2012
	Certificates of deposit	$	1,603	$	—	$	—		$	1,603
	State, municipal and local government agencies bonds	59,009		45		(4		)	59,050
	Corporate bonds	31,568		4		(10		)	31,562
	Commercial paper	10,287		1		—			10,288
	U.S. federal government bonds	2,003		—		—			2,003
	Total short-term investments	$	104,470	$	50	$	(14	)	$	104,506
Maturities of Short-Term Investments	'
	The following table summarizes the maturities of the Company’s short-term investments (in thousands):
		December 31,
		2013		2012
	Less than one year	$	55,278	$	76,779
	Due in 1 - 2 years	24,974		27,727
	Total short-term investments	$	80,252	$	104,506

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Financial Assets and Liabilities Measured at Fair Value Based on Three-Tier Fair Value Hierarchy	'
	The following table sets forth the fair value of the Company’s financial assets and liabilities measured at fair value based on the three-tier fair value hierarchy (in thousands):
		Level 1		Level 2		Level 3		Total
	As of December 31, 2013
	Cash equivalents
	Money market funds	$	51,014	$	—	$	—	$	51,014
	Short-term investments
	State, municipal and local government agencies bonds	—		40,449		—		40,449
	Corporate bonds	—		33,496		—		33,496
	Commercial paper	—		2,299		—		2,299
	U.S. federal government bonds	4,008		—		—		4,008
	Prepaids and other current assets
	Derivative assets (1)	—		196		—		196
	Total assets measured and recorded at fair value	$	55,022	$	76,440	$	—	$	131,462
	Accrued Liabilities
	Derivative Liabilities (1)	$	—	$	195	$	—	$	195
	Total liabilities measured and recorded at fair value	$	—	$	195	$	—	$	195
		Level 1		Level 2		Level 3		Total
	As of December 31, 2012
	Cash equivalents
	Money market funds	$	54,923	$	—	$	—	$	54,923
	Corporate bonds with maturity less than 90 days	—		3,614		—		3,614
	U.S. federal government bonds with maturity less than 90 days	3,005		—		—		3,005
	Short-term investments
	Certificates of deposit	—		1,603		—		1,603
	State, municipal and local government agencies bonds	—		59,050		—		59,050
	Corporate bonds	—		31,562		—		31,562
	Commercial paper	—		10,288		—		10,288
	U.S. federal government bonds	2,003		—		—		2,003
	Prepaids and other current assets
	Derivative assets (1)	—		344		—		344
	Total assets measured and recorded at fair value	$	59,931	$	106,461	$	—	$	166,392
	Accrued liabilities
	Derivative liabilities (1)	$	—	$	143	$	—	$	143
	Total liabilities measured and recorded at fair value	$	—	$	143	$	—	$	143
	(1) Derivative assets and liabilities represent forward currency exchange contracts. The Company enters into these contracts to minimize the short-term impact of foreign currency exchange rates fluctuations primarily from trade and inter-company receivables and payables.

Accounts_Receivable_Tables

Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2013
Receivables [Abstract]	'
Accounts Receivable, Net of Allowances	'
	Accounts receivable, net of allowances, consisted of the following (in thousands):
		December 31,
		2013			2012
	Accounts receivable	$	83,266		$	95,515
	Less: allowance for doubtful accounts and sales returns	(8,214		)	(9,595		)
		$	75,052		$	85,920
Summary of Activity in Allowances for Doubtful Accounts, Returns and Discounts	'
	The following is a summary of activity in allowances for doubtful accounts and sales returns for the three years ended December 31, 2013, 2012 and 2011 (in thousands):
		Balance at			Charges to			Charges		Additions to			Balance at End
		Beginning of			Revenue			(Credits) to		(Deductions			of Period
		Period						Expense		from) Reserves
	Year ended December 31,
	2013	$	9,595		$	537		$	423	$	(2,341	)	$	8,214
	2012	$	8,252		$	3,141		$	461	$	(2,259	)	$	9,595
	2011	$	5,897		$	2,620		$	615	$	(880	)	$	8,252

Certain_Balance_Sheet_Componen1

Certain Balance Sheet Components (Tables)	12 Months Ended
	Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]	'
Prepaid Expenses and Other Current Assets	'
	The following tables provide details of selected balance sheet components (in thousands):
		December 31,
		2013			2012
	Prepaid expenses and other current assets:
	Prepaid Inventories (1)	$	7,500		$	—
	Other Prepayments	10,823			8,736
	Deferred cost of revenue	2,656			13,953
	Other	542			947
		$	21,521		$	23,636
	(1) 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.
Inventories	'
		December 31,
		2013			2012
	Inventories:
	Raw materials	$	2,389		$	10,731
	Work-in-process	976			4,347
	Finished goods	33,561			49,192
		$	36,926		$	64,270
Property and Equipment	'
		December 31,
		2013			2012
	Property and equipment:
	Furniture and fixtures	$	8,227		$	7,856
	Machinery and equipment	114,178			108,262
	Leasehold improvements	7,888			7,612
		130,293			123,730
	Less: accumulated depreciation and amortization	(95,348		)	(85,608		)
		$	34,945		$	38,122
Accrued Liabilities	'
		December 31,
		2013			2012
	Accrued liabilities:
	Accrued compensation	$	6,688		$	10,890
	Accrued incentive compensation	9,589			7,403
	Accrued warranty	3,606			4,292
	Other	15,466			19,830
		$	35,349		$	42,415

Restructuring_and_Excess_Facil1

Restructuring and Excess Facilities (Tables)	12 Months Ended
	Dec. 31, 2013
Omneon Restructuring [Member]	'
Restructuring Cost and Reserve [Line Items]	'
Activities in Restructuring Accrual	'
	The following table summarizes the activity in the Omneon restructuring accrual during the years ended December 31, 2013, 2012 and 2011 (in thousands):
		Excess
		Facilities
	Balance at December 31, 2010	$	2,862
	Provisions	517
	Cash payments, net of sublease income	(786		)
	Balance at December 31, 2011	2,593
	Provisions	94
	Cash payments, net of sublease income	(1,818		)
	Balance at December 31, 2012	869
	Provisions	28
	Cash payments, net of sublease income	(897		)
	Balance at December 31, 2013	$	—
HFC Restructuring [Member]	'
Restructuring Cost and Reserve [Line Items]	'
Activities in Restructuring Accrual	'
	The following table summarizes the activity in the HFC restructuring accrual during the year ended December 31, 2013 (in thousands):
		Severance			Contract Termination			Total
	Restructuring charges in discontinued operations	$	403		$	124		$	527
	Adjustments to restructuring provisions	102			(29		)	73
	Cash payments	(492		)	(95		)	(587		)
	Balance at December 31, 2013	$	13		$	—		$	13
Harmonic 2013 Restructuring [Member]	'
Restructuring Cost and Reserve [Line Items]	'
Activities in Restructuring Accrual	'
	The following table summarizes the activity in the Harmonic 2013 restructuring accrual during the year ended December 31, 2013 (in thousands):
		Severance			Impairment of Leasehold Improvement			Obsolete Inventories			Total
	Restructuring charges in continued operations	$	1,663		$	101		$	404		$	2,168
	Adjustments to restructuring provisions	29			48			—			77
	Cash payments	(1,513		)	—			—			(1,513		)
	Non-cash write-offs	—			(149		)	(404		)	(553		)
	Balance at December 31, 2013	$	179		$	—		$	—		$	179

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Components of Accumulated Other Comprehensive Loss	'
	The components of accumulated other comprehensive loss were as follows (in thousands):
		December 31,
		2013			2012
	Foreign currency translation adjustments	$	(242	)	$	(502	)
	Unrealized gain on investments	33			37
	Accumulated other comprehensive loss	$	(209	)	$	(465	)

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary of Company's Stock Option and Restricted Stock Unit Activity	'
	The following table summarizes the Company’s stock option and restricted stock unit activity during the year ended December 31, 2013 (in thousands, except per share amounts):
				Stock Options						Restricted Stock Units
				Outstanding						Outstanding
		Shares		Number			Weighted			Number		Weighted
		Available		of			Average			of		Average
		for Grant		Shares			Exercise			Units		Grant Date
							Price					Fair Value
	Balance at December 31, 2012	10,155		8,900			$	6.83		3,938		$	6.44
	Authorized	—		—			—			—		—
	Granted	(3,757	)	1,505			5.97			1,501		6.02
	Options exercised	—		(888	)		4.14			—		—
	Shares released	—		—			—			(1,888	)	6.29
	Forfeited or canceled	2,354		(1,632	)		7.06			(533	)	6.38
	Balance at December 31, 2013	8,752		7,885			$	6.92		3,018		$	6.34
Summary of Stock Options Outstanding	'
	The following table summarizes information about stock options outstanding as of December 31, 2013 (in thousands, except per share amounts and term):
		Number		Weighted				Weighted	Aggregate
		of		Average				Average	Intrinsic
		Shares		Exercise				Remaining	Value
				Price				Contractual
								Term (Years)
	Vested and expected to vest	7,631		$	6.95			3.2	$	7,594
	Exercisable	5,556		7.24				2.2	4,638
Summary of Restricted Stock Units Outstanding	'
	The following table summarizes information about restricted stock units outstanding as of December 31, 2013 (in thousands, except term):
		Number of		Weighted		Aggregate
		Shares		Average		Fair
		Underlying		Remaining		Value
		Restricted		Vesting Period
		Stock Units		(Years)
	Vested and expected to vest	2,782		0.8		$	20,534

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary of Stock-Based Compensation Expense	'
	The following table summarizes stock-based compensation expense (in thousands):
		Year ended December 31,
		2013			2012				2011
	Employee stock-based compensation in:
	Cost of revenue	$	2,411		$	2,828			$	2,912
	Research and development expense	4,431			6,151				6,618
	Selling, general and administrative expense	9,160			9,449				10,798
	Total stock-based compensation in operating expense	13,591			15,600				17,416
	Total employee stock-based compensation recognized in income (loss) from continuing operations	$	16,002		$	18,428			$	20,328
Valuation Assumptions for Stock Options	'
	The Company estimated the fair value of all employee stock options using a Black-Scholes valuation model with the following weighted average assumptions:
		Employee Stock Options
		2013		2012			2011
	Expected term (in years)	4.7		4.7			4.75
	Volatility	50	%	56	%		55	%
	Risk-free interest rate	0.9	%	0.9	%		1.8	%
	Dividend yield	0	%	0	%		0	%
Employee Stock Purchase Plan	'
	The call option and put option were valued using the Black-Scholes option pricing model with the following assumptions:
		Employee Stock Purchase Plan
		2013		2012			2011
	Expected term (in years)	0.5		0.5			0.5
	Volatility	31	%	49	%		45	%
	Risk-free interest rate	0.2	%	0.2	%		0.2	%
	Dividend yield	0	%	0	%		0	%

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income (Loss) Before Income Tax Provision	'
	(Loss) income from continuing operations before income taxes consists of the following (in thousands):
		Year ended December 31,
		2013				2012				2011
	United States	$	(31,521	)		$	(27,068	)		$	(14,164	)
	International	8,369				9,373				15,531
	(Loss) income from continuing operations before income taxes	$	(23,152	)		$	(17,695	)		$	1,367
Provision for Income Taxes	'
	The components of the benefit from income taxes consist of the following (in thousands):
		Year ended December 31,
		2013				2012				2011
	Current:
	Federal	$	(38,243	)		$	857			$	(95	)
	State	93				212				529
	International	1,988				1,193				1,222
	Deferred:
	Federal	(10,543		)		(2,053		)		(3,618		)
	State	3,023				(1,362		)		(392		)
	International	(1,059		)		(353		)		1,703
	Total benefit from income taxes	$	(44,741	)		$	(1,506	)		$	(651	)
Reconciliation of Provision for Income Taxes	'
	The differences between the (benefit from) provision for income taxes computed at the U.S. federal statutory rate at 35% and the Company’s actual (benefit from) provision for income taxes are as follows (in thousands):
		Year ended December 31,
		2013				2012				2011
	(Benefit from) provision for income taxes at U.S. Federal statutory rate	$	(8,103	)		$	(6,193	)		$	478
	State taxes	2,940				(824		)		(1,034		)
	Differential in rates on foreign earnings	(1,396		)		(4,880		)		(9,565		)
	Losses for which no benefit is taken	4,311				7,279				9,185
	Change in valuation allowance	(996		)		(1,104		)		1,822
	Change in liabilities for uncertain tax positions	(35,742		)		1,495				(1,666		)
	Non-deductible stock-based compensation	981				1,974				1,854
	Research and development tax credits	(5,044		)		—				(2,006		)
	Non-deductible meals and entertainment	346				208				213
	Adjustments related to tax positions taken during prior years	(1,154		)		619				(255		)
	Tax-exempt investment income	(304		)		(248		)		(71		)
	Other	(580		)		168				394
	Total (benefit from) provision for income taxes	$	(44,741	)		$	(1,506	)		$	(651	)
Components of Deferred Tax Assets and Liabilities	'
	The components of net deferred tax assets included in the Consolidated Balance Sheets are as follows (in thousands):
		December 31,
		2013				2012
	Deferred tax assets:
	Reserves and accruals	$	29,235			$	31,999
	Net operating loss carryovers	27,253				27,522
	Research and development credit carryovers	18,391				13,704
	Deferred stock-based compensation	7,554				7,684
	Other tax credits	2,738				2,207
	Gross deferred tax assets	85,171				83,116
	Valuation allowance	(38,644		)		(34,347		)
	Gross deferred tax assets after valuation allowance	46,527				48,769
	Deferred tax liabilities:
	Depreciation and amortization	(3,590		)		(5,485		)
	Intangibles	(6,227		)		(11,656		)
	Other	(738		)		(483		)
	Gross deferred tax liabilities	(10,555		)		(17,624		)
	Net deferred tax assets	$	35,972			$	31,145
Activities Related to Valuation Allowance	'
		Year ended December 31,
		2013				2012				2011
	Balance at beginning of period	$	34,347			$	28,354			$	26,557
	Additions	6,364				5,993				1,797
	Deductions	(2,067		)		—				—
	Balance at end of period	$	38,644			$	34,347			$	28,354
Activities Related to Gross Unrecognized Tax Benefits	'
	The following table summarizes the activity related to the Company’s gross unrecognized tax benefits (in millions):
		Year ended December 31,
		2013			2012			2011
	Balance at beginning of period	52.1			52.5			48.4
	Increase in balance related to tax positions taken during current year	5.4			0.6			6.6
	Decrease in balance as a result of a lapse of the applicable statues of limitations	(1.3	)		(0.9	)		(2.1	)
	Decrease in balance due to settlement with tax authorities	(32.1	)		—			—
	Increase in balance related to tax positions taken during prior years	0.1			—			—
	Decrease in balance related to tax positions taken during prior years	—			(0.1	)		(0.4	)
	Balance at end of period	24.2			52.1			52.5

Net_Income_Loss_Per_Share_Tabl

Net Income (Loss) Per Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations	'
	The following table presents the calculation of basic and diluted net income per share (in thousands, except per share amounts):
		December 31,
		2013		2012			2011
	Numerator:
	Income (loss) from continuing operations	$	21,589	$	(16,189	)	$	2,018
	Income (loss) from discontinued operations	15,438		5,252			6,761
	Net income (loss)	$	37,027	$	(10,937	)	$	8,779
	Denominator:
	Weighted average shares outstanding
	Basic	106,529		116,457			115,175
	Effect of dilutive securities from stock options, restricted stock units and ESPP	1,279		—			1,252
	Diluted	107,808		116,457			116,427
	Basic net income (loss) per share from:
	Continuing operations	$	0.2	$	(0.14	)	$	0.02
	Discontinued operations	$	0.14	$	0.05		$	0.06
	Net income (loss)	$	0.35	$	(0.09	)	$	0.08
	Diluted net income (loss) per share from:
	Continuing operations	$	0.2	$	(0.14	)	$	0.02
	Discontinued operations	$	0.14	$	0.05		$	0.06
	Net income (loss)	$	0.34	$	(0.09	)	$	0.08

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Summary of Revenue by Product Type	'
	The Company’s revenue by product type is summarized as follows (in thousands):
		Year ended December 31,
		2013		2012		2011
	Video processing products	$	219,667	$	219,441	$	236,567
	Production and playout products	87,799		90,246		98,842
	Cable edge products	69,132		86,637		85,679
	Service and support	85,342		80,547		69,786
	Total revenues	$	461,940	$	476,871	$	490,874
Summary of Revenue, Property and Equipment, Net by Geographic Region	'
	Our revenue by geographic region, based on the location at which each sale originates, and our property and equipment, net by geographic region, is summarized as follows (in thousands):
		Year ended December 31,
		2013		2012		2011
	Net revenue:
	United States	$	199,790	$	208,874	$	224,980
	International	262,150		267,997		265,894
	Total	$	461,940	$	476,871	$	490,874
		As of December 31,
		2013		2012
	Property and equipment, net:
	United States	$	26,550	$	30,477
	Israel	5,057		4,230
	All other	3,338		3,415
	Total	$	34,945	$	38,122

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Future Minimum Lease Payments Under Noncancelable Operating Leases	'
	Future minimum lease payments under non-cancelable operating leases at December 31, 2013, are as follows (in thousands):
		Operating Leases
	Year ending December 31,
	2014	$	9,803
	2015	9,327
	2016	8,087
	2017	7,676
	2018	7,620
	Thereafter	13,574
	Total minimum payments	$	56,087
Summary of Warranty Accrual Included in Accrued Liabilities	'
	Activity for the Company’s warranty accrual, which is included in accrued liabilities, is summarized below (in thousands):
		Year ended December 31,
		2013			2012			2011
	Balance at beginning of period	$	4,292		$	5,558		$	4,811
	Transfer to Aurora as part of the sale of discontinued operations	(939		)	—			—
	Accrual for current period warranties	7,158			5,798			8,245
	Warranty costs incurred	(6,905		)	(7,064		)	(7,498		)
	Balance at end of period	$	3,606		$	4,292		$	5,558

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Data [Abstract]	'
Summary of Quarterly Financial Data	'
	The following table sets forth our unaudited quarterly Consolidated Statement of Operations data for each of the eight quarters ended December 31, 2013. In management’s opinion, the data has been prepared on the same basis as the audited Consolidated Financial Statements included in this report, and reflects all necessary adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of this data.
		Fiscal 2013
		1st Quarter			2nd Quarter			3rd Quarter			4th Quarter
		(In thousands, except per share amounts)
	Quarterly Data:
	Net revenue	$	101,672		$	117,128		$	122,918		$	120,222
	Gross profit	46,165			57,892			56,792			59,596
	Income (loss) from continuing operations, net of tax	(9,503		)	(3,404		)	36,675			(2,179		)
	Income (loss) from discontinued operations, net of tax	15,924			(396		)	91			(181		)
	Net income (loss)	$	6,421		$	(3,800	)	$	36,766		$	(2,360	)
	Basic net income (loss) per share:
	Continuing operations	$	(0.08	)	$	(0.03	)	$	0.36		$	(0.02	)
	Discontinued operations	$	0.14		$	0		$	0		$	0
	Net income (loss)	$	0.06		$	(0.03	)	$	0.36		$	(0.02	)
	Diluted net income (loss) per share:
	Continuing operations	$	(0.08	)	$	(0.03	)	$	0.36		$	(0.02	)
	Discontinued operations	$	0.14		$	0		$	0		$	0
	Net income (loss)	$	0.06		$	(0.03	)	$	0.36		$	(0.02	)
	Shares used in per share calculations:
	Basic	115,219			109,938			101,144			100,372
	Diluted	115,219			109,938			102,723			100,372
		Fiscal 2012
		1st Quarter			2nd Quarter			3rd Quarter			4th Quarter
		(In thousands, except per share amounts)
	Quarterly Data:
	Net revenue	$	116,439		$	122,060		$	120,391		$	117,981
	Gross profit	50,462			55,081			54,878			60,111
	Income (loss) from continuing operations, net of tax	(8,735		)	(3,875		)	(4,469		)	890
	Income (loss) from discontinued operations, net of tax	1,207			3,892			(3,761		)	3,914
	Net income (loss)	$	(7,528	)	$	17		$	(8,230	)	$	4,804
	Basic net income (loss) per share:
	Continuing operations	$	(0.07	)	$	(0.03	)	$	(0.04	)	$	0.01
	Discontinued operations	$	0.01		$	0.03		$	(0.03	)	$	0.03
	Net income (loss)	$	(0.06	)	$	0		$	(0.07	)	$	0.04
	Diluted net income (loss) per share:
	Continuing operations	$	(0.07	)	$	(0.03	)	$	(0.04	)	$	0.01
	Discontinued operations	$	0.01		$	0.03		$	(0.03	)	$	0.03
	Net income (loss)	$	(0.06	)	$	0		$	(0.07	)	$	0.04
	Shares used in per share calculations:
	Basic	117,275			117,056			116,517			115,097
	Diluted	117,275			117,056			116,517			115,732

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)

12 Months Ended

1 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Mar. 05, 2013

Furniture and fixtures [Member]

Internal Use Software [Member]

Machinery and equipment [Member]

Leasehold Improvements [Member]

Forward Contracts [Member]

Forward Contracts [Member]

Software [Member]

Software Development [Member]

Software Development [Member]

Software Development [Member]

Accounts Receivable [Member]

Accounts Receivable [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

HFC business [Member]

Minimum [Member]

Maximum [Member]

Customer

Customer

Net Revenue [Member]

Net Revenue [Member]

Net Revenue [Member]

Comcast [Member]

Comcast [Member]

Comcast [Member]

Summary Of Significant Accounting Policies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gross proceeds from sale of cable access HFC business

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$46,000,000

Recorded remeasurement losses for foreign currency exchange rate

500,000

700,000

700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Forward exchange contracts maturity term description

'These derivative instruments generally have maturities between one to three months.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative contract term

'

'

'

'

'

'

'

'1 month

'3 months

'

'

'

'

'

'

'

'

'

'

Cash and cash equivalents maximum maturity

'3 months

'3 months

'3 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Available-for-sale securities, maturity term

'24 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Entity-wide revenue, major customer, accounts receivable percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

10.00%

12.00%

11.00%

10.00%

'

Number of significant customers for accounts receivable

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

Revenue recognition period, associated with service and maintenance agreement

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of revenue recognized upon completion contract method

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, plant and equipment estimated useful life

'

'

'

'5 years

'3 years

'4 years

'10 years

'

'

'3 years

'

'

'

'

'

'

'

'

'

Internal use software development cost capitalized

'

'

'

'

'

'

'

'

'

'

1,400,000

800,000

1,100,000

'

'

'

'

'

'

Property, plant and equipment leasehold improvements useful lives

'

'

'

'

'

'

'shorter of the remaining useful lives of the assets, up to ten years, or the lease term of the respective assets

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill, impairment loss

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Advertising expense

$400,000

$500,000

$800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

More Likely Than Not Threshold Recognition of Uncertain Tax Position

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discontinued_Operations_Additi

Discontinued Operations - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended				12 Months Ended	1 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 05, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 29, 2013	Dec. 31, 2013	Mar. 05, 2013	Dec. 31, 2013
	segment			Contract Manufacturing [Member]	HFC business [Member]	HFC business [Member]	HFC business [Member]	HFC business [Member]	Aurora [Member]	Aurora [Member]	Aurora [Member]
										HFC business [Member]	HFC business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Gross proceeds from sale of cable access HFC business	'	'	'	'	'	'	'	'	'	$46,000	'
Net gain from sale of HFC business	14,663	0	0	'	14,663	0	0	'	'	'	14,663
Number of reportable segments	1	'	'	'	'	'	'	'	'	'	'
Transition services agreement, term	'	'	'	'5 months	'	'	'	'	'	'	'
Total TSA billing to Aurora	'	'	'	'	'	'	'	'	977	'	'
Carrying value of goodwill based on the fair value	$14,547	$0	'	'	$14,547	'	'	$14,500	'	'	'

Discontinued_Operations_Schedu

Discontinued Operations - Schedule of Details on Income Statement Caption on TSA Billing (Detail) (Aurora [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total TSA billing to Aurora	$977
Product cost of revenue [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total TSA billing to Aurora	577
Research and development expense [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total TSA billing to Aurora	21
Selling, general and administrative expenses [Member]	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'
Total TSA billing to Aurora	$379

Discontinued_Operations_Record

Discontinued Operations - Recorded Gain With the Sale of Cable Access HFC Business (Detail) (USD $)	12 Months Ended							1 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 29, 2013	Mar. 05, 2013	Dec. 31, 2013
				HFC business [Member]	HFC business [Member]	HFC business [Member]	HFC business [Member]	Aurora [Member]	Aurora [Member]
								HFC business [Member]	HFC business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'	'	'	'	'	'	'
Gross Proceeds	'	'	'	'	'	'	'	$46,000	'
Inventories, net	'	'	'	10,579	'	'	'	'	'
Prepaid expenses and other current assets	'	'	'	612	'	'	'	'	'
Property and equipment, net	'	'	'	1,194	'	'	'	'	'
Goodwill de-recognized	14,547	0	'	14,547	'	'	14,500	'	'
Deferred revenue	'	'	'	-4,499	'	'	'	'	'
Accrued liabilities	'	'	'	-939	'	'	'	'	'
Total net assets sold and de-recognized	'	'	'	21,494	'	'	'	'	'
Less : Selling cost	'	'	'	2,485	'	'	'	'	'
Less : Tax effect	'	'	'	7,358	'	'	'	'	'
Gain on disposal, net of taxes	$14,663	$0	$0	$14,663	$0	$0	'	'	$14,663

Discontinued_Operations_Revenu

Discontinued Operations - Revenues and Components of Net Income Related to Discontinued Operations (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Add: Gain (loss) on disposal, net of taxes	$14,663	$0	$0
HFC business [Member]	'	'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Revenue	9,717	53,593	58,458
Operating income	539	8,610	10,266
Less : provision for (benefit from) income taxes	-236	3,358	3,505
Add: Gain (loss) on disposal, net of taxes	14,663	0	0
Income (loss) from discontinued operations, net of taxes	$15,438	$5,252	$6,761

Goodwill_and_Identified_Intang2

Goodwill and Identified Intangible Assets - Summary of Goodwill and Identified Intangible Assets (Detail) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

In Thousands, unless otherwise specified

Developed core technology [Member]

Developed core technology [Member]

Developed core technology [Member]

Developed core technology [Member]

Customer relationships/contracts [Member]

Customer relationships/contracts [Member]

Customer relationships/contracts [Member]

Customer relationships/contracts [Member]

Trademarks and tradenames [Member]

Trademarks and tradenames [Member]

Trademarks and tradenames [Member]

Trademarks and tradenames [Member]

Maintenance agreements and related relationships [Member]

Maintenance agreements and related relationships [Member]

Maintenance agreements and related relationships [Member]

Maintenance agreements and related relationships [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Finite-Lived Intangible Assets [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquired finite-lived intangible assets, weighted average useful life

'

'

'

'

'4 years

'6 years

'

'

'5 years

'6 years

'

'

'4 years

'5 years

'

'

'6 years

'7 years

Gross Carrying Amount

$221,704

$221,704

$136,145

$136,145

'

'

$67,098

$67,098

'

'

$11,361

$11,361

'

'

$7,100

$7,100

'

'

Accumulated Amortization

-190,585

-163,257

-121,681

-102,449

'

'

-53,772

-48,150

'

'

-10,565

-9,145

'

'

-4,567

-3,513

'

'

Total

$31,119

$58,447

$14,464

$33,696

'

'

$13,326

$18,948

'

'

$796

$2,216

'

'

$2,533

$3,587

'

'

Goodwill_and_Identified_Intang3

Goodwill and Identified Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]	'	'
Balance at beginning of period	$212,518	$212,417
Reduction in goodwill associated with the sale of the cable access HFC Business	-14,547	0
Foreign currency translation adjustment	51	101
Balance at end of period	$198,022	$212,518

Goodwill_and_Identified_Intang4

Goodwill and Identified Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]	'	'	'
Percentage of estimated fair value exceeding the carrying value	82.00%	'	'
Amortization expense for identified intangibles	$27,329	$29,204	$30,420
Cost of revenue [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Amortization expense for identified intangibles	$19,200	$20,500	$21,500

Goodwill_and_Identified_Intang5

Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense of Purchased Intangible Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'
2014	$20,520	'
2015	6,502	'
2016	4,097	'
2017	0	'
2018	0	'
Total	31,119	58,447
Cost of revenue [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
2014	13,745	'
2015	719	'
2016	0	'
2017	0	'
2018	0	'
Total	14,464	'
Operating Expenses [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
2014	6,775	'
2015	5,783	'
2016	4,097	'
2017	0	'
2018	0	'
Total	$16,655	'

ShortTerm_Investments_Summary_

Short-Term Investments - Summary of Short-Term Investments (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Amortized Cost	$80,212	$104,470
Gross Unrealized Gains	62	50
Gross Unrealized Losses	-22	-14
Total short-term investments, Estimated Fair Value	80,252	104,506
Certificates of deposit [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Amortized Cost	'	1,603
Gross Unrealized Gains	'	0
Gross Unrealized Losses	'	0
Total short-term investments, Estimated Fair Value	'	1,603
State, municipal and local government agencies bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Amortized Cost	40,426	59,009
Gross Unrealized Gains	38	45
Gross Unrealized Losses	-15	-4
Total short-term investments, Estimated Fair Value	40,449	59,050
Corporate bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Amortized Cost	33,483	31,568
Gross Unrealized Gains	20	4
Gross Unrealized Losses	-7	-10
Total short-term investments, Estimated Fair Value	33,496	31,562
Commercial paper [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Amortized Cost	2,299	10,287
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Total short-term investments, Estimated Fair Value	2,299	10,288
U.S. federal government bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Amortized Cost	4,004	2,003
Gross Unrealized Gains	4	0
Gross Unrealized Losses	0	0
Total short-term investments, Estimated Fair Value	$4,008	$2,003

ShortTerm_Investments_Maturiti

Short-Term Investments - Maturities of Short-Term Investments (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]	'	'
Less than one year	$55,278	$76,779
Due in 1 - 2 years	24,974	27,727
Total short-term investments, Estimated Fair Value	$80,252	$104,506

ShortTerm_Investments_Addition

Short-Term Investments - Additional Information (Detail) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]	'
Available-for-sale securities in material unrealized loss position	$0

Fair_Value_Measurements_Financ

Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value Based on Three-Tier Fair Value Hierarchy (Detail) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	$131,462		$166,392
Total liabilities measured and recorded at fair value	195		143
Cash equivalents [Member] | Money market funds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	51,014		54,923
Cash equivalents [Member] | Corporate bonds [Member] | Maturity less than 90 days [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	'		3,614
Cash equivalents [Member] | U.S. federal government bonds [Member] | Maturity less than 90 days [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	'		3,005
Short-term investments [Member] | Corporate bonds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	33,496		31,562
Short-term investments [Member] | U.S. federal government bonds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	4,008		2,003
Short-term investments [Member] | Certificates of deposit [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	'		1,603
Short-term investments [Member] | State, municipal and local government agencies bonds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	40,449		59,050
Short-term investments [Member] | Commercial paper [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	2,299		10,288
Prepaids and other current assets [Member] | Foreign exchange forward contracts [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	196	[1]	344	[1]
Accrued liabilities [Member] | Foreign exchange forward contracts [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total liabilities measured and recorded at fair value	195	[1]	143	[1]
Level 1 [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	55,022		59,931
Total liabilities measured and recorded at fair value	0		0
Level 1 [Member] | Cash equivalents [Member] | Money market funds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	51,014		54,923
Level 1 [Member] | Cash equivalents [Member] | Corporate bonds [Member] | Maturity less than 90 days [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	'		0
Level 1 [Member] | Cash equivalents [Member] | U.S. federal government bonds [Member] | Maturity less than 90 days [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	'		3,005
Level 1 [Member] | Short-term investments [Member] | Corporate bonds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	0		0
Level 1 [Member] | Short-term investments [Member] | U.S. federal government bonds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	4,008		2,003
Level 1 [Member] | Short-term investments [Member] | Certificates of deposit [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	'		0
Level 1 [Member] | Short-term investments [Member] | State, municipal and local government agencies bonds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	0		0
Level 1 [Member] | Short-term investments [Member] | Commercial paper [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	0		0
Level 1 [Member] | Prepaids and other current assets [Member] | Foreign exchange forward contracts [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	0	[1]	0	[1]
Level 1 [Member] | Accrued liabilities [Member] | Foreign exchange forward contracts [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total liabilities measured and recorded at fair value	0	[1]	0	[1]
Level 2 [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	76,440		106,461
Total liabilities measured and recorded at fair value	195		143
Level 2 [Member] | Cash equivalents [Member] | Money market funds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	0		0
Level 2 [Member] | Cash equivalents [Member] | Corporate bonds [Member] | Maturity less than 90 days [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	'		3,614
Level 2 [Member] | Cash equivalents [Member] | U.S. federal government bonds [Member] | Maturity less than 90 days [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	'		0
Level 2 [Member] | Short-term investments [Member] | Corporate bonds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	33,496		31,562
Level 2 [Member] | Short-term investments [Member] | U.S. federal government bonds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	0		0
Level 2 [Member] | Short-term investments [Member] | Certificates of deposit [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	'		1,603
Level 2 [Member] | Short-term investments [Member] | State, municipal and local government agencies bonds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	40,449		59,050
Level 2 [Member] | Short-term investments [Member] | Commercial paper [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	2,299		10,288
Level 2 [Member] | Prepaids and other current assets [Member] | Foreign exchange forward contracts [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	196	[1]	344	[1]
Level 2 [Member] | Accrued liabilities [Member] | Foreign exchange forward contracts [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total liabilities measured and recorded at fair value	195	[1]	143	[1]
Level 3 [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	0		0
Total liabilities measured and recorded at fair value	0		0
Level 3 [Member] | Cash equivalents [Member] | Money market funds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	0		0
Level 3 [Member] | Cash equivalents [Member] | Corporate bonds [Member] | Maturity less than 90 days [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	'		0
Level 3 [Member] | Cash equivalents [Member] | U.S. federal government bonds [Member] | Maturity less than 90 days [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	'		0
Level 3 [Member] | Short-term investments [Member] | Corporate bonds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	0		0
Level 3 [Member] | Short-term investments [Member] | U.S. federal government bonds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	0		0
Level 3 [Member] | Short-term investments [Member] | Certificates of deposit [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	'		0
Level 3 [Member] | Short-term investments [Member] | State, municipal and local government agencies bonds [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	0		0
Level 3 [Member] | Short-term investments [Member] | Commercial paper [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	0		0
Level 3 [Member] | Prepaids and other current assets [Member] | Foreign exchange forward contracts [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total assets measured and recorded at fair value	0	[1]	0	[1]
Level 3 [Member] | Accrued liabilities [Member] | Foreign exchange forward contracts [Member]	'		'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'		'
Total liabilities measured and recorded at fair value	$0	[1]	$0	[1]
[1]	Derivative assets and liabilities represent forward currency exchange contracts. The Company enters into these contracts to minimize the short-term impact of foreign currency exchange rates fluctuations primarily from trade and inter-company receivables and payables.

Accounts_Receivable_Accounts_R

Accounts Receivable - Accounts Receivable, Net of Allowances (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Receivables [Abstract]	'	'
Accounts receivable	$83,266	$95,515
Less: allowance for doubtful accounts, returns and discounts	-8,214	-9,595
Accounts Receivable, Net, Current, Total	$75,052	$85,920

Accounts_Receivable_Summary_of

Accounts Receivable - Summary of Activity in Allowances for Doubtful Accounts, Returns and Discounts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Receivables [Abstract]	'	'	'
Activity in allowances for doubtful accounts, Balance at Beginning of Period	$9,595	$8,252	$5,897
Activity in allowances for doubtful accounts, Charges to Revenue	537	3,141	2,620
Activity in allowances for doubtful accounts, Charges (Credits) to Expense	423	461	615
Activity in allowances for doubtful accounts, Additions to (Deductions from) Reserves	-2,341	-2,259	-880
Activity in allowances for doubtful accounts, Balance at End of Period	$8,214	$9,595	$8,252

Certain_Balance_Sheet_Componen2

Certain Balance Sheet Components - (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Prepaid expenses and other current assets:	'		'
Prepaid Inventories	$7,500	[1]	$0	[1]
Other Prepayments	10,823		8,736
Deferred cost of revenue	2,656		13,953
Other	542		947
Prepaid expenses and other current assets	21,521		23,636
Inventories:	'		'
Raw materials	2,389		10,731
Work-in-process	976		4,347
Finished goods	33,561		49,192
Total inventories, net	36,926		64,270
Property and equipment:	'		'
Furniture and fixtures	8,227		7,856
Machinery and equipment	114,178		108,262
Leasehold improvements	7,888		7,612
Property, Plant and Equipment Gross, Total	130,293		123,730
Less: accumulated depreciation and amortization	-95,348		-85,608
Property and equipment, net	34,945		38,122
Accrued liabilities:	'		'
Accrued compensation	6,688		10,890
Accrued incentive compensation	9,589		7,403
Accrued warranty	3,606		4,292
Other	15,466		19,830
Accrued liabilities, Total	$35,349		$42,415
[1]	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.

Restructuring_and_Excess_Facil2

Restructuring and Excess Facilities - Additional Information (Detail) (USD $)

12 Months Ended

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2008

Dec. 31, 2010

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Sunnyvale building [Member]

Omneon Restructuring [Member]

Omneon Restructuring [Member]

Omneon Restructuring [Member]

Omneon Restructuring [Member]

HFC Restructuring [Member]

HFC Restructuring [Member]

HFC Restructuring [Member]

Harmonic 2013 Restructuring [Member]

Harmonic 2013 Restructuring [Member]

Harmonic 2013 Restructuring [Member]

Harmonic 2013 Restructuring [Member]

Harmonic 2013 Restructuring [Member]

Harmonic 2013 Restructuring [Member]

Excess Facilities [Member]

Excess Facilities [Member]

Excess Facilities [Member]

Excess Facilities [Member]

Employee

Severance [Member]

Contract Termination [Member]

Employee

Cost of revenue [Member]

Operating Expenses [Member]

Inventory Valuation and Obsolescence [Member]

Severance [Member]

Leasehold Improvements [Member]

Restructuring Cost and Reserve [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Lease expiration date

'

'

'

'2010-09

'

'

'

'

'

'

'

'

'

'

'

'

'

Restructuring and related charges

$1,421

$0

$0

'

$3,000

$28

$94

$517

'

'

'

$2,200

$824

$1,421

'

$1,700

'

Restructuring charges

'

'

'

'

'

'

'

'

600

505

95

'

'

'

'

'

'

Number of employees terminated

'

'

'

'

'

'

'

'

9

'

'

85

'

'

'

'

'

Non-cash write-offs

'

'

'

'

'

'

'

'

'

'

'

553

'

'

404

0

149

Number of employees terminated required to be hired

'

'

'

'

'

'

'

'

10

'

'

'

'

'

'

'

'

Restructuring reserve

'

'

'

'

2,862

0

869

2,593

13

13

0

179

'

'

0

179

0

Restructuring charges in continued operations

'

'

'

'

'

'

'

'

'

'

'

2,168

'

'

404

1,663

101

Adjustments to restructuring provisions

'

'

'

'

'

'

'

'

$73

$102

($29)

$77

'

'

$0

$29

$48

Restructuring_and_Excess_Facil3

Restructuring and Excess Facilities - Activities in Restructuring Accrual (Detail) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Provisions	'	$1,421	$0	$0
Omneon Restructuring [Member] | Excess Facilities [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Beginning Balance	'	869	2,593	2,862
Provisions	3,000	28	94	517
Cash payments, net of sublease income	'	-897	-1,818	-786
Ending Balance	2,862	0	869	2,593
HFC Restructuring [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges in discontinued operations	'	527	'	'
Adjustments to restructuring provisions	'	73	'	'
Cash payments	'	-587	'	'
Ending Balance	'	13	'	'
HFC Restructuring [Member] | Severance [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges in discontinued operations	'	403	'	'
Adjustments to restructuring provisions	'	102	'	'
Cash payments	'	-492	'	'
Ending Balance	'	13	'	'
HFC Restructuring [Member] | Contract Termination [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges in discontinued operations	'	124	'	'
Adjustments to restructuring provisions	'	-29	'	'
Cash payments	'	-95	'	'
Ending Balance	'	0	'	'
Harmonic 2013 Restructuring [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Provisions	'	2,200	'	'
Restructuring charges in continued operations	'	2,168	'	'
Adjustments to restructuring provisions	'	77	'	'
Cash payments	'	-1,513	'	'
Non-cash write-offs	'	-553	'	'
Ending Balance	'	179	'	'
Harmonic 2013 Restructuring [Member] | Severance [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Provisions	'	1,700	'	'
Restructuring charges in continued operations	'	1,663	'	'
Adjustments to restructuring provisions	'	29	'	'
Cash payments	'	-1,513	'	'
Non-cash write-offs	'	0	'	'
Ending Balance	'	179	'	'
Harmonic 2013 Restructuring [Member] | Impairment of Leasehold Improvements [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges in continued operations	'	101	'	'
Adjustments to restructuring provisions	'	48	'	'
Cash payments	'	0	'	'
Non-cash write-offs	'	-149	'	'
Ending Balance	'	0	'	'
Harmonic 2013 Restructuring [Member] | Obsolete Inventories [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges in continued operations	'	404	'	'
Adjustments to restructuring provisions	'	0	'	'
Cash payments	'	0	'	'
Non-cash write-offs	'	-404	'	'
Ending Balance	'	$0	'	'

Credit_Facilities_Additional_I

Credit Facilities - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Debt Instrument [Line Items]	'
Maximum borrowing capacity under bank line of credit facility	$10,000,000
Bank line of credit facility, maturity date	22-Aug-14
Borrowings under bank line of credit facility	0
Unrestricted cash, cash equivalents and short term investments to current liabilities ratio	'maintain a ratio of unrestricted cash, accounts receivable and short term investments to current liabilities (less deferred revenue) of at least 1.75 to 1.00
Line of credit facility financial covenant terms	'4.12 to 1
Line of credit facility financial covenant terms	1.75
Ratio under covenant	4.12
Covenants under the line of credit facility	'At December 31, 2013, Harmonic was in compliance with the covenants under the line of credit facility
Interest rate	3.25%
Annualized rate of LIBOR	0.17%
Credit facility collateral	'Borrowings are not collateralized
Minimum [Member]	'
Debt Instrument [Line Items]	'
Percentage added to LIBOR to facilitate line of credit	1.75%
Maximum [Member]	'
Debt Instrument [Line Items]	'
Percentage added to LIBOR to facilitate line of credit	1.92%
Standby letters of credit [Member]	'
Debt Instrument [Line Items]	'
Maximum borrowing capacity under bank line of credit facility	200,000
Line of credit [Member]	'
Debt Instrument [Line Items]	'
Maximum borrowing capacity under bank line of credit facility	$9,800,000

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended			24 Months Ended			12 Months Ended		0 Months Ended
	Mar. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2010	Jul. 31, 2002	Dec. 31, 2010	Dec. 31, 2013	24-May-13	24-May-13
						Omneon [Member]	Series A Participating Preferred Stock [Member]	Common Stock [Member]	Open Market Transaction [Member]	Dutch Auction Tender Offer [Member]	Additional Paid-in Capital [Member]
								Acquisition of Omneon [Member]			Dutch Auction Tender Offer [Member]
Class of Stock [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Preferred stock authorized	'	5,000,000	5,000,000	'	5,000,000	'	100,000	'	'	'	'
Stockholder rights plan, period	'	'10 years	'	'	'	'	'	'	'	'	'
Stockholder rights plan, expiry date	'	'July 2012	'	'	'	'	'	'	'	'	'
Common stock, shares issued	'	'	'	'	'	'	'	14,150,122	'	'	'
Purchase price paid as common stocks	'	'	'	'	'	'	'	$95,900,000	'	'	'
Cash deposited to secure post-closing indemnification obligations of holders	'	'	'	'	'	21,000,000	'	'	'	'	'
Number of common stock deposited to secure post-closing indemnification obligations of holders	'	'	'	1,926,920	'	'	'	'	'	'	'
Reimbursement received from escrow in cash	500,000	'	'	'	'	'	'	'	'	'	'
Reimbursement received from escrow common stock value	300,000	'	'	'	'	'	'	'	'	'	'
Claim for reimbursement received from escrow	800,000	'	'	'	'	'	'	'	'	'	'
Reimbursement received from escrow common stock shares	40,372	'	'	'	'	'	'	'	'	'	'
Authorized stock repurchase value	'	220,000,000	25,000,000	'	'	'	'	'	'	'	'
Common stock repurchased and retired, shares	'	'	5,100,000	'	23,400,000	'	'	'	6,300,000	12,000,000	'
Common stock repurchased and retired, per shares value	'	'	$4.43	'	'	'	'	'	$6.48	$6.25	'
Common stock repurchased and retired, aggregate value	'	'	22,600,000	'	138,200,000	'	'	'	40,600,000	76,000,000	1,000,000
Increase in stock repurchase program	'	195,000,000	'	'	'	'	'	'	'	'	'
Common stock repurchases program expire date	'	'December 2014	'	'	'	'	'	'	'	'	'
Common stock repurchase program, authorized amount remaining	'	$81,800,000	'	'	'	'	'	'	'	'	'

Stockholders_Equity_Components

Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Equity [Abstract]	'	'
Foreign currency translation adjustments	($242)	($502)
Unrealized gain on investments	33	37
Accumulated Other Comprehensive Loss	($209)	($465)

Employee_Benefit_Plans_Additio

Employee Benefit Plans - Additional Information (Detail) (USD $)	0 Months Ended	6 Months Ended	12 Months Ended
	Aug. 14, 2013	Jun. 28, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Shares available for grant	'	'	8,752,000	10,155,000	'
Additional shares authorized	'	'	0	'	'
Intrinsic value of options exercised	'	'	$2,300,000	$800,000	$5,200,000
Percentage of contribution by eligible participants	'	'	4.00%	'	'
Maximum contribution per participant	'	'	1,000	'	'
Defined contribution plan description	'	'	'This plan allows participants to contribute up to the applicable Internal Revenue Code limitations under the plan. Harmonic can make discretionary contributions to the plan of 25% of the first 4% contributed by eligible participants, up to a maximum contribution per participant of $1,000 per year. Employer contributions were suspended from 2009 through 2012, but have been renewed, on the same basis for 2013, totaling $0.4 million.	'	'
Company discretionary employee match	'	'	25.00%	'	'
Employer contributions made	'	'	400,000	'	'
1995 Stock Plan [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Price at which incentive stock options may be granted	'	'	'not less than 100% of the fair value	'	'
Price at which non-statutory stock options may be granted	'	'	'not less than 85% of the fair value	'	'
Expiration period	'	'	'7 years	'	'
Decrease in plan reserve for every unit	'	'	'1.5 shares for every unit or share granted	'	'
Decrease in plan reserve for every unit	'	'	1.5	'	'
Increase in plan reserve for every unit	'	'	'1.5 shares for every unit or share forfeited	'	'
Increase in plan reserve for every unit	'	'	1.5	'	'
Common stock reserved for issuance	'	'	18,606,465	'	'
Shares available for grant	'	'	8,586,056	'	'
Share based compensation arrangement vesting period	'	'	'Both options and RSUs vest over a period of time as determined by the Board, generally two to four years, and expire seven years from date of grant. Options granted prior to February 2006 expire ten years from the date of grant.	'	'
Exercise price of RSUs	'	'	$0	'	'
1995 Stock Plan [Member] | Minimum [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Vesting period	'	'	'2 years	'	'
1995 Stock Plan [Member] | Maximum [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Vesting period	'	'	'4 years	'	'
1995 Stock Plan [Member] | Prior To February 2006 [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Expiration period	'	'	'10 years	'	'
1995 Stock Plan [Member] | Incentive Options [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Price at which stock options may be granted	'	'	100.00%	'	'
1995 Stock Plan [Member] | Stock Options [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Price at which stock options may be granted	'	'	85.00%	'	'
2002 Director Plan [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Price at which non-statutory stock options may be granted	'	'	'not less than 100% of the fair value	'	'
Price at which stock options may be granted	'	'	100.00%	'	'
Vesting period	'	'	'3 years	'	'
Expiration period	'	'	'7 years	'	'
Common stock reserved for issuance	'	'	560,841	'	'
Shares available for grant	'	'	166,655	'	'
Share based compensation arrangement vesting period	'	'	'Both options and RSUs vest over a period of time as determined by the Board, generally three years for the initial grant and one year for subsequent grants to a non-employee director, and expire seven years from date of grant	'	'
Exercise price of RSUs	'	'	$0	'	'
Reduced the number of shares reserved for every unit granted	'	'	1.5	'	'
Increased number of shares reserved for every unit forfeited	'	'	1.5	'	'
2002 Director Plan [Member] | Subsequent Grants [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Vesting period	'	'	'1 year	'	'
Employee Stock Purchase Plan [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Percentage of fair market value of Common Stock to purchase shares	'	'	85.00%	'	'
Range of payroll deduction	'	'	'1% to 10%	'	'
Percentage of stock awards funded	'	53.00%	'	'	'
Percentage of contributions refunded to employees	'	47.00%	'	'	'
Additional shares authorized	1,000,000	'	'	'	'
Common stock issued under the 2002 ESPP	'	'	1,230,851	1,598,895	945,287
Stock contributions value under 2002 ESPP	'	'	$4,800,000	$6,400,000	$5,200,000
Total number of shares issued under plan	'	'	9,499,960	'	'
Employee Stock Purchase Plan [Member] | Minimum [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Employee Stock Purchase Plan Annual Contribution Per Employee Percent	'	'	1.00%	'	'
Employee Stock Purchase Plan [Member] | Maximum [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Employee Stock Purchase Plan Annual Contribution Per Employee Percent	'	'	10.00%	'	'
Assumed Omneon Stock Options [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Vesting period	'	'	'4 years	'	'
Maximum term of stock options granted	'	'	'10 years	'	'
Common stock reserved for issuance	'	'	299,745	'	'
Assumed Omneon Stock Options [Member] | Assumed Unvested Stock Option [Member] | Omneon [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Number of assumed options to be issued under the assumed acquisition stock plans	'	'	1,522,000	'	'
Assumed Omneon Stock Options [Member] | Assumed unvested restricted stock units [Member] | Omneon [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Number of assumed options to be issued under the assumed acquisition stock plans	'	'	1,455,000	'	'
Assumed Omneon Stock Options [Member] | Options and Restricted Stock Units [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Vesting period	'	'	'4 years	'	'
Other Stock Option Plans [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Common stock reserved for issuance	'	'	187,650	'	'

Employee_Benefit_Plans_Summary

Employee Benefit Plans - Summary of Company's Stock Option and Restricted Stock Unit Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]	'
Shares Available for Grant, Beginning balance	10,155,000
Shares Available for Grant, Authorized	0
Shares Available for Grant, Granted	-3,757,000
Shares Available for Grant, Options exercised	0
Shares Available for Grant, Shares released	0
Shares Available for Grant, Forfeited or cancelled	2,354,000
Shares Available for Grant, Ending balance	8,752,000
Stock Options Outstanding [Member]	'
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]	'
Number of Shares, Beginning balance	8,900,000
Number of Shares, Authorized	0
Number of Shares, Granted	1,505,000
Number of Shares, Options exercised	-888,000
Number of Shares, Forfeited or cancelled	-1,632,000
Number of Shares, Ending balance	7,885,000
Weighted Average Exercise Price, Beginning balance	6.83
Weighted Average Exercise Price, Authorized	0
Weighted Average Exercise Price, Granted	5.97
Weighted Average Exercise Price, Options exercised	4.14
Weighted Average Exercise Price, Forfeited or cancelled	7.06
Weighted Average Exercise Price, Ending balance	6.92
Restricted Stock Units Outstanding [Member]	'
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]	'
Number of Shares, Authorized	0
Number of Units, Beginning balance	3,938,000
Number of Units, Granted	1,501,000
Number of Units, Exercised	0
Number of Units, Shares released	-1,888,000
Number of Units, Forfeited or cancelled	-533,000
Number of Units, Ending balance	3,018,000
Weighted Average Grant Date Fair Value, Beginning balance	6.44
Weighted Average Grant Date Fair Value, Authorized	0
Weighted Average Grant Date Fair Value, Granted	6.02
Weighted Average Grant Date Fair Value, Exercised	0
Weighted Average Grant Date Fair Value, Shares released	6.29
Weighted Average Grant Date Fair Value, Forfeited or cancelled	6.38
Weighted Average Grant Date Fair Value, Ending balance	6.34

Employee_Benefit_Plans_Summary1

Employee Benefit Plans - Summary of Stock Options Outstanding (Detail) (Stock Options Outstanding [Member], USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013
Stock Options Outstanding [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Number of Shares, Vested and expected to vest	7,631
Weighted Average Exercise Price, Vested and expected to vest	$6.95
Weighted Average Remaining Contractual Term (Years), Vested and expected to vest	'3 years 2 months 13 days
Aggregate Intrinsic Value, Vested and expected to vest	$7,594
Number of Shares, Exercisable	5,556
Weighted Average Exercise Price, Exercisable	$7.24
Weighted Average Remaining Contractual Term (Years), Exercisable	'2 years 2 months 13 days
Aggregate Intrinsic Value, Exercisable	$4,638

Employee_Benefit_Plans_Summary2

Employee Benefit Plans - Summary of Restricted Stock Units Outstanding (Detail) (Restricted Stock Units Outstanding [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Restricted Stock Units Outstanding [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Number of Shares Underlying Restricted Stock Units, Vested and expected to vest	2,782
Weighted Average Remaining Vesting Period (Years), Vested and expected to vest	'10 months 6 days
Aggregate Fair Value, Vested and expected to vest	$20,534

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total employee stock-based compensation recognized in income (loss) from continuing operations	$16,002	$18,428	$20,328
Cost of revenue [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total employee stock-based compensation recognized in income (loss) from continuing operations	2,411	2,828	2,912
Research and development expense [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total employee stock-based compensation recognized in income (loss) from continuing operations	4,431	6,151	6,618
Selling, general and administrative expense [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total employee stock-based compensation recognized in income (loss) from continuing operations	9,160	9,449	10,798
Operating expense [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Total employee stock-based compensation recognized in income (loss) from continuing operations	$13,591	$15,600	$17,416

StockBased_Compensation_Valuat

Stock-Based Compensation - Valuation Assumptions for Stock Options (Detail) (Stock Options [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Options [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected term (in years)	'4 years 8 months 12 days	'4 years 8 months 12 days	'4 years 9 months
Volatility	50.00%	56.00%	55.00%
Risk-free interest rate	0.90%	0.90%	1.80%
Dividend yield	0.00%	0.00%	0.00%

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Total unamortized stock-based compensation cost related to unvested stock options and restricted stock units	$18.10	'	'
Remaining weighted-average amortization period	'1 year 8 months 59 days	'	'
Stock Options [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected dividend yield	0.00%	0.00%	0.00%
Weighted-average fair value per share of option granted	$2.55	$2.64	$4.20
Fair value of options vested	3.3	4.7	7.1
Total realized tax benefit	0.1	0.1	2
Restricted Stock Units Outstanding [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Issuance of restricted stocks fair value	$11.90	$12.30	$10.50
Weighted-average fair value per share other than option granted	$6.02	'	'
Employee Stock Purchase Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected dividend yield	0.00%	0.00%	0.00%
Discount percentage on purchase of stock	15.00%	'	'
Value of stock purchase right percentage of call option	85.00%	'	'
Value of stock purchase right percentage of put option	15.00%	'	'
Weighted-average fair value per share other than option granted	$1.21	$1.33	$2.15

StockBased_Compensation_Employ

Stock-Based Compensation - Employee Stock Purchase Plan (Detail) (Employee Stock Purchase Plan [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Stock Purchase Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected term (in years)	'6 months	'6 months	'6 months
Volatility	31.00%	49.00%	45.00%
Risk-free interest rate	0.20%	0.20%	0.20%
Dividend yield	0.00%	0.00%	0.00%

Income_Taxes_Income_Loss_Befor

Income Taxes - Income (Loss) Before Income Tax Provision (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
United States	($31,521)	($27,068)	($14,164)
International	8,369	9,373	15,531
Income (loss) from continuing operations before income taxes	($23,152)	($17,695)	$1,367

Income_Taxes_Provision_for_Inc

Income Taxes - Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:	'	'	'
Federal	($38,243)	$857	($95)
State	93	212	529
International	1,988	1,193	1,222
Deferred:	'	'	'
Federal	-10,543	-2,053	-3,618
State	3,023	-1,362	-392
International	-1,059	-353	1,703
Total (benefit from) provision for income taxes	($44,741)	($1,506)	($651)

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
(Benefit from) provision for income taxes at U.S. Federal statutory rate	($8,103)	($6,193)	$478
State taxes	2,940	-824	-1,034
Differential in rates on foreign earnings	-1,396	-4,880	-9,565
Losses for which no benefit is taken	4,311	7,279	9,185
Change in valuation allowance	-996	-1,104	1,822
Change in liabilities for uncertain tax positions	-35,742	1,495	-1,666
Non-deductible stock-based compensation	981	1,974	1,854
Research and development tax credits	-5,044	0	-2,006
Non-deductible meals and entertainment	346	208	213
Adjustments related to tax positions taken during prior years	-1,154	619	-255
Tax-exempt investment income	-304	-248	-71
Other	-580	168	394
Total (benefit from) provision for income taxes	($44,741)	($1,506)	($651)

Income_Taxes_Components_of_Def

Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Thousands, unless otherwise specified
Deferred tax assets:	'	'	'	'
Reserves and accruals	$29,235	$31,999	'	'
Net operating loss carryovers	27,253	27,522	'	'
Research and development credit carryovers	18,391	13,704	'	'
Deferred stock-based compensation	7,554	7,684	'	'
Other tax credits	2,738	2,207	'	'
Gross deferred tax assets	85,171	83,116	'	'
Valuation allowance	-38,644	-34,347	-28,354	-26,557
Gross deferred tax assets after valuation allowance	46,527	48,769	'	'
Deferred tax liabilities:	'	'	'	'
Depreciation and amortization	-3,590	-5,485	'	'
Intangibles	-6,227	-11,656	'	'
Other	-738	-483	'	'
Gross deferred tax liabilities	-10,555	-17,624	'	'
Net deferred tax assets	$35,972	$31,145	'	'

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

24 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

State [Member]

Foreign [Member]

Federal [Member]

Federal [Member]

Federal AMT [Member]

Switzerland [Member]

Switzerland [Member]

Switzerland [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

American Taxpayer Relief Act [Member]

State [Member]

State [Member]

Scenario, Forecast [Member]

Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent

35.00%

35.00%

35.00%

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Tax Assets, Valuation Allowance

$38,644,000

$34,347,000

$28,354,000

$26,557,000

'

'

'

'

'

'

'

'

'

'

'

Discrete Tax Benefit related to reversal of uncertain tax positions from expiration of statute of limitations

'

'

'

'

'

'

39,000,000

'

'

'

'

'

'

'

'

Decrease in balance as a result of a lapse of the applicable statues of limitations

1,300,000

900,000

2,100,000

'

'

'

'

'

'

'

'

'

'

'

10,000,000

Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense

'

1,900,000

200,000

'

'

'

'

'

'

'

'

'

'

'

'

Income tax benefit from reinstatement of US federal research tax credit

5,044,000

0

2,006,000

'

'

'

'

2,400,000

'

'

'

'

'

'

'

Operating loss carry forwards

'

'

'

'

85,300,000

96,400,000

'

'

'

'

'

'

'

'

'

Operating loss carryforwards, expiration date

'

'

'

'

'

'

'

'

'

'

'

'

1-Jan-14

1-Jan-31

'

State net operating loss carry forwards

8,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Tax credit carryovers

'

'

'

'

29,800,000

'

5,900,000

'

2,700,000

'

'

'

'

'

'

Year that federal tax credits expire

'

'

'

'

'

'

1-Jan-31

'

'

'

'

'

'

'

'

Tax credit expiration

'

'

'

'

'will not expire

'

'

'

'will not expire

'

'

'

'

'

'

Gross unrecognized tax benefits including interest and penalties

24,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accrued potential interest related to unrecognized tax benefits

1,500,000

7,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Discrete net tax benefit related to the release of tax reserves

-5,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Federal income taxes not provided on undistributed earnings of non-U.S. subsidiaries

77,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Tax savings due to reduction in tax rate

'

'

'

'

'

'

'

'

'

$1,500,000

$1,100,000

$700,000

'

'

'

Increase in diluted earnings per share

'

'

'

'

'

'

'

'

'

$0.01

$0.01

$0.01

'

'

'

Benefits from a tax ruling

'

'

'

'

'

'

'

'

'

'The Company's operations in Switzerland is subject to a reduced tax rate under the Switzerland tax holiday which requires various thresholds of investment and employment in Switzerland.

'

'

'

'

'

Additional period for renewal for investment and employment in foreign country

'

'

'

'

'

'

'

'

'

'effective through the end of 2018

'

'

'

'

'

More Likely Than Not Threshold Recognition of Uncertain Tax Position

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income_Taxes_Income_Taxes_Summ

Income Taxes Income Taxes - Summary of Valuation Allowance (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation Allowance [Abstract]	'	'	'
Balance at beginning of period	$34,347	$28,354	$26,557
Additions	6,364	5,993	1,797
Deductions	-2,067	0	0
Balance at end of period	$38,644	$34,347	$28,354

Income_Taxes_Activities_Relate

Income Taxes - Activities Related to Gross Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Balance at beginning of period	$52.10	$52.50	$48.40
Increase in balance related to tax positions taken during current year	5.4	0.6	6.6
Decrease in balance as a result of a lapse of the applicable statues of limitations	-1.3	-0.9	-2.1
Decrease in balance due to settlement with tax authorities	-32.1	0	0
Increase in balance related to tax positions taken during prior years	0.1	0	0
Decrease in balance related to tax positions taken during prior years	0	-0.1	-0.4
Balance at end of period	$24.20	$52.10	$52.50

Net_Income_Loss_Per_Share_Addi

Net Income (Loss) Per Share - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]	'	'	'
Potentially dilutive equity awards outstanding	6,890,820	14,136,804	14,770,995

Net_Income_Loss_Per_Share_Nume

Net Income (Loss) Per Share - Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 31, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator:	'	'	'	'	'	'	'	'	'	'	'
Income (loss) from continuing operations	($2,179)	$36,675	($3,404)	($9,503)	$890	($4,469)	($3,875)	($8,735)	$21,589	($16,189)	$2,018
Income (loss) from discontinued operations	-181	91	-396	15,924	3,914	-3,761	3,892	1,207	15,438	5,252	6,761
Net income (loss)	($2,360)	$36,766	($3,800)	$6,421	$4,804	($8,230)	$17	($7,528)	$37,027	($10,937)	$8,779
Denominator:	'	'	'	'	'	'	'	'	'	'	'
Weighted average shares outstanding - basic	100,372	101,144	109,938	115,219	115,097	116,517	117,056	117,275	106,529	116,457	115,175
Effect of dilutive securities from stock options, restricted stock units and ESPP	'	'	'	'	'	'	'	'	1,279	0	1,252
Diluted (in shares)	100,372	102,723	109,938	115,219	115,732	116,517	117,056	117,275	107,808	116,457	116,427
Basic net income (loss) per share from:	'	'	'	'	'	'	'	'	'	'	'
Continuing operations, basic (usd per share)	($0.02)	$0.36	($0.03)	($0.08)	$0.01	($0.04)	($0.03)	($0.07)	$0.20	($0.14)	$0.02
Discontinued operations, basic (usd per share)	$0	$0	$0	$0.14	$0.03	($0.03)	$0.03	$0.01	$0.14	$0.05	$0.06
Net income (loss) per share - basic	($0.02)	$0.36	($0.03)	$0.06	$0.04	($0.07)	$0	($0.06)	$0.35	($0.09)	$0.08
Diluted net income (loss) per share from:	'	'	'	'	'	'	'	'	'	'	'
Continuing operations, diluted (usd per share)	($0.02)	$0.36	($0.03)	($0.08)	$0.01	($0.04)	($0.03)	($0.07)	$0.20	($0.14)	$0.02
Discontinued operations, diluted (usd per share)	$0	$0	$0	$0.14	$0.03	($0.03)	$0.03	$0.01	$0.14	$0.05	$0.06
Net income (loss) per share - diluted	($0.02)	$0.36	($0.03)	$0.06	$0.04	($0.07)	$0	($0.06)	$0.34	($0.09)	$0.08

Segment_Information_Summary_of

Segment Information - Summary of Revenue by Product Type (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	segment
Revenue from External Customer [Line Items]	'	'	'
Number of reportable segments	1	'	'
Total revenues	$461,940	$476,871	$490,874
Video processing products [Member]	'	'	'
Revenue from External Customer [Line Items]	'	'	'
Total revenues	219,667	219,441	236,567
Production and playout products [Member]	'	'	'
Revenue from External Customer [Line Items]	'	'	'
Total revenues	87,799	90,246	98,842
Cable edge products [Member]	'	'	'
Revenue from External Customer [Line Items]	'	'	'
Total revenues	69,132	86,637	85,679
Service and support [Member]	'	'	'
Revenue from External Customer [Line Items]	'	'	'
Total revenues	$85,342	$80,547	$69,786

Segment_Information_Summary_of1

Segment Information - Summary of Revenue, Property and Equipment, Net by Geographic Region (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net revenues:	'	'	'
Net revenue, total	$461,940	$476,871	$490,874
Property and equipment, net:	'	'	'
Property and equipment, net	34,945	38,122	'
United States [Member]	'	'	'
Net revenues:	'	'	'
Net revenue, total	199,790	208,874	224,980
Property and equipment, net:	'	'	'
Property and equipment, net	26,550	30,477	'
International [Member]	'	'	'
Net revenues:	'	'	'
Net revenue, total	262,150	267,997	265,894
Israel [Member]	'	'	'
Property and equipment, net:	'	'	'
Property and equipment, net	5,057	4,230	'
All Other [Member]	'	'	'
Property and equipment, net:	'	'	'
Property and equipment, net	$3,338	$3,415	'

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Contingencies And Commitments [Line Items]	'	'	'
Operating leases, rent expense	$9,600,000	$7,100,000	$7,100,000
Maximum amount of potential future payments under the company's financial guarantees	200,000	'	'
Non-cancelable purchase commitments	16,800,000	'	'
Indemnification [Member]	'	'	'
Contingencies And Commitments [Line Items]	'	'	'
Accrual for indemnification provisions	0	'	'
Israel [Member]	'	'	'
Contingencies And Commitments [Line Items]	'	'	'
Guarantees which major related to rent	500,000	'	'
Royalty expenses	$4,400,000	$3,000,000	$2,400,000
Property Subject to Operating Lease [Member] | Maximum [Member]	'	'	'
Contingencies And Commitments [Line Items]	'	'	'
Lease Expiration Date	1-May-22	'	'
Property Subject to Operating Lease [Member] | Maximum [Member] | Israel [Member]	'	'	'
Contingencies And Commitments [Line Items]	'	'	'
Lease Expiration Date	1-Jan-16	'	'

Commitments_and_Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments Under Noncancelable Operating Leases (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
2014	$9,803
2015	9,327
2016	8,087
2017	7,676
2018	7,620
Thereafter	13,574
Total minimum payments	$56,087

Commitments_and_Contingencies_3

Commitments and Contingencies - Summary of Warranty Accrual Included in Accrued Liabilities (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]	'	'	'
Balance at beginning of period	$4,292	$5,558	$4,811
Transfer to Aurora as part of the sale of discontinued operations	-939	0	0
Accrual for current period warranties	7,158	5,798	8,245
Warranty costs incurred	-6,905	-7,064	-7,498
Balance at end of period	$3,606	$4,292	$5,558

Legal_Proceedings_Additional_I

Legal Proceedings - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2013	Mar. 31, 2010	Mar. 31, 2010	Jun. 29, 2012	Oct. 31, 2011	Nov. 30, 2012	Apr. 30, 2010
	USD ($)		USD ($)	ILS	Avid Technology Inc. [Member]	Avid Technology Inc. [Member]	FastVDO [Member]	Arris Corporation [Member]
					Patents	Patents	Patents	Patents
Loss Contingencies [Line Items]	'	'	'	'	'	'	'	'
Infringements of number of patents held	'	'	'	'	1	2	1	4
Liability recorded in litigation	$1,300,000	'	'	'	'	'	'	'
Amount of ex-parte judgment	'	'	$1,700,000	6,300,000	'	'	'	'
Action was dismissed by the Israeli Central District Court	'	26-Jun-12	'	'	'	'	'	'

Selected_Quarterly_Financial_D2

Selected Quarterly Financial Data - Summary of Quarterly Financial Data (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 31, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Data [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	$120,222	$122,918	$117,128	$101,672	$117,981	$120,391	$122,060	$116,439	'	'	'
Gross profit	59,596	56,792	57,892	46,165	60,111	54,878	55,081	50,462	220,445	220,532	236,816
Income (loss) from continuing operations	-2,179	36,675	-3,404	-9,503	890	-4,469	-3,875	-8,735	21,589	-16,189	2,018
Income (loss) from discontinued operations	-181	91	-396	15,924	3,914	-3,761	3,892	1,207	15,438	5,252	6,761
Net income (loss)	($2,360)	$36,766	($3,800)	$6,421	$4,804	($8,230)	$17	($7,528)	$37,027	($10,937)	$8,779
Basic net income (loss) per share from:	'	'	'	'	'	'	'	'	'	'	'
Continuing operations, basic (usd per share)	($0.02)	$0.36	($0.03)	($0.08)	$0.01	($0.04)	($0.03)	($0.07)	$0.20	($0.14)	$0.02
Discontinued operations, basic (usd per share)	$0	$0	$0	$0.14	$0.03	($0.03)	$0.03	$0.01	$0.14	$0.05	$0.06
Net income (loss), basic (usd per share)	($0.02)	$0.36	($0.03)	$0.06	$0.04	($0.07)	$0	($0.06)	$0.35	($0.09)	$0.08
Diluted net income (loss) per share from:	'	'	'	'	'	'	'	'	'	'	'
Continuing operations, diluted (usd per share)	($0.02)	$0.36	($0.03)	($0.08)	$0.01	($0.04)	($0.03)	($0.07)	$0.20	($0.14)	$0.02
Discontinued operations, diluted (usd per share)	$0	$0	$0	$0.14	$0.03	($0.03)	$0.03	$0.01	$0.14	$0.05	$0.06
Net income (loss), diluted (usd per share)	($0.02)	$0.36	($0.03)	$0.06	$0.04	($0.07)	$0	($0.06)	$0.34	($0.09)	$0.08
Weighted average shares outstanding - basic	100,372	101,144	109,938	115,219	115,097	116,517	117,056	117,275	106,529	116,457	115,175
Weighted average shares outstanding - diluted	100,372	102,723	109,938	115,219	115,732	116,517	117,056	117,275	107,808	116,457	116,427