Harmonic (HLIT) 10-Q 10 Aug 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jul. 01, 2016	Aug. 01, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 1, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Trading Symbol	HLIT
Entity Registrant Name	HARMONIC INC
Entity Central Index Key	851,310
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		78,030,325

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jul. 01, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 51,516	$ 126,190
Short-term investments	13,760	26,604
Accounts receivable, net	102,668	69,515
Inventories	36,624	38,819
Prepaid expenses and other current assets	43,317	25,003
Total current assets	247,885	286,131
Property and equipment, net	36,517	27,012
Goodwill	235,369	197,781
Intangibles, net	39,638	4,097
Other long-term assets	28,635	9,936
Total assets	588,044	524,957
Current liabilities:
Other debts and capital lease obligations, current	7,829	0
Accounts payable	35,794	19,364
Income taxes payable	139	307
Deferred revenue	62,679	33,856
Accrued liabilities	52,346	31,354
Total current liabilities	158,787	84,881
Convertible notes, long-term	100,712	98,295
Other debts and capital lease obligations, long-term	16,190
Income taxes payable, long-term	3,980	3,886
Deferred tax liabilities, long-term	957	0
Other non-current liabilities	15,341	9,727
Total liabilities	295,967	196,789
Commitments and contingencies (Note 16)
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; 78,015 and 76,015 shares issued and outstanding at July 1, 2016 and December 31, 2015, respectively	78	76
Additional paid-in capital	2,245,120	2,236,418
Accumulated deficit	(1,949,767)	(1,903,908)
Accumulated other comprehensive loss	(3,354)	(4,418)
Total stockholders’ equity	292,077	328,168
Total liabilities and stockholders’ equity	$ 588,044	$ 524,957

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jul. 01, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	78,015,000	76,015,000
Common stock, shares outstanding	78,015,000	76,015,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Income Statement [Abstract]
Product	$ 77,413	$ 77,447	$ 135,057	$ 157,920
Services	32,158	25,656	56,346	49,199
Total net revenue	109,571	103,103	191,403	207,119
Product	44,049	35,977	71,238	71,437
Services	14,482	12,741	28,471	26,269
Total cost of revenue	58,531	48,718	99,709	97,706
Total gross profit	51,040	54,385	91,694	109,413
Operating expenses:
Research and development	26,507	21,816	50,070	44,145
Selling, general and administrative	36,516	31,281	69,386	62,477
Amortization of intangibles	4,232	1,446	6,597	2,892
Restructuring and related charges	1,903	185	4,515	229
Total operating expenses	69,158	54,728	130,568	109,743
Loss from operations	(18,118)	(343)	(38,874)	(330)
Interest (expense) income, net	(2,651)	17	(5,072)	72
Other income (expense), net	332	59	323	(447)
Loss on impairment of long-term investment	0	0	(1,476)	(2,505)
Loss before income taxes	(20,437)	(267)	(45,099)	(3,210)
Provision for income taxes	242	727	760	441
Net loss	$ (20,679)	$ (994)	$ (45,859)	$ (3,651)
Net loss per share:
Basic and diluted	$ (0.27)	$ (0.01)	$ (0.59)	$ (0.04)
Shares used in per share calculation:
Basic and diluted	77,342	88,426	77,168	88,541

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Net loss	$ (20,679)	$ (994)	$ (45,859)	$ (3,651)
Other comprehensive income (loss) before tax:
Unrealized gains (losses) arising during the period	(165)	516	158	332
Losses (gains) reclassified into earnings	22	(138)	100	(187)
Change in unrealized gains (losses) on cash flow hedges:	(143)	378	258	145
Unrealized gains (losses) arising during the period	(49)	460	30	945
Loss reclassified into earnings	0	0	1,476	0
Change in unrealized gains (losses) on available-for-sale securities:	(49)	460	1,506	945
Change in foreign currency translation adjustments	(2,611)	582	(677)	(402)
Other comprehensive income (loss) before tax	(2,803)	1,420	1,087	688
Less: Provision for (benefit from) income taxes	5	(10)	23	(6)
Other comprehensive income (loss), net of tax	(2,808)	1,430	1,064	694
Total comprehensive income (losses)	$ (23,487)	$ 436	$ (44,795)	$ (2,957)

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015
Cash flows from operating activities:
Net loss	$ (45,859)	$ (3,651)
Adjustments to reconcile net loss to net cash provided by operating activities:
Amortization of intangibles	8,322	3,439
Depreciation	7,737	6,930
Stock-based compensation	5,862	8,018
Amortization of discount on convertible debt	2,417	0
Restructuring, asset impairment and loss on retirement of fixed assets	1,687	252
Loss on impairment of long-term investment	1,476	2,505
Deferred income taxes, net	38	0
Provision for excess and obsolete inventories	5,203	843
Allowance for doubtful accounts, returns and discounts	697	(713)
Excess tax benefits from stock-based compensation	0	(22)
Other non-cash adjustments, net	144	0
Changes in operating assets and liabilities, net of effects of acquisition:
Accounts receivable	(16,000)	(1,222)
Inventories	3,158	(595)
Prepaid expenses and other assets	(4,148)	(11,635)
Accounts payable	2,168	6,415
Deferred revenue	25,956	9,833
Income taxes payable	(122)	(815)
Accrued and other liabilities	(7,029)	(5,994)
Net cash (used in) provided by operating activities	(8,293)	13,588
Cash flows from investing activities:
Acquisition of business, net of cash acquired	(72,989)
Purchases of investments	0	(12,986)
Proceeds from maturities of investments	12,842	15,744
Purchases of property and equipment	(7,708)	(7,505)
Purchases of long-term investments	0	(85)
Net cash used in investing activities	(67,855)	(4,832)
Cash flows from financing activities:
Payment of convertible debt issuance costs	(582)	0
Increase in other debts and capital leases	5,972	0
Repayment of other debts and capital leases	(6,524)	0
Payments for repurchase of common stock	0	(12,171)
Proceeds from common stock issued to employees	3,737	9,133
Payment of tax withholding obligations related to net share settlements of restricted stock units	(1,034)	(2,642)
Excess tax benefits from stock-based compensation	0	22
Net cash provided by (used in) financing activities	1,569	(5,658)
Effect of exchange rate changes on cash and cash equivalents	(95)	(81)
Net (decrease) increase in cash and cash equivalents	(74,674)	3,017
Cash and cash equivalents at beginning of period	126,190	73,032
Cash and cash equivalents at end of period	$ 51,516	$ 76,049

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	6 Months Ended
	Jul. 01, 2016
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The accompanying unaudited condensed consolidated financial statements, in the opinion of management, include all adjustments (consisting only of normal recurring adjustments) which Harmonic Inc. (“Harmonic,” or the “Company”) considers necessary for a fair statement of the results of operations for the interim periods covered and the consolidated financial condition of the Company at the date of the balance sheets. This Quarterly Report on Form 10-Q should be read in conjunction with the Company’s audited consolidated financial statements contained in the Company’s Annual Report on Form 10-K, which was filed with the Securities and Exchange Commission on March 24, 2016 (the “2015 Form 10-K”). The interim results presented herein are not necessarily indicative of the results of operations that may be expected for the full fiscal year ending December 31, 2016, or any other future period. The Company’s fiscal quarters are based on 13-week periods, except for the fourth quarter, which ends on December 31. The condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. The year-end condensed balance sheet was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”). Use of Estimates The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP 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 financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Business Combination The Company applies the acquisition method of accounting for business combinations to its acquisition of Thomson Video Networks (“TVN”), which closed on February 29, 2016. (See Note 3, “Business Acquisition” for additional information on TVN acquisition). Under this method of accounting, all assets acquired and liabilities assumed are recorded at their respective fair values at the date of the completion of the transaction. Determining the fair value of assets acquired and liabilities assumed requires management’s judgment and often involves the use of significant estimates and assumptions, including assumptions with respect to future cash inflows and outflows, discount rates, intangibles and other asset lives, among other items. Fair value is defined as the price that would be received in a sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (an exit price). Market participants are assumed to be buyers and sellers in the principal (most advantageous) market for the asset or liability. Additionally, fair value measurements for an asset assume the highest and best use of that asset by market participants. As a result, the Company may have been required to value the acquired assets at fair value measurements that do not reflect its intended use of those assets. Use of different estimates and judgments could yield different results. Any excess of the purchase price over the fair value of the net assets acquired is recognized as goodwill. The accounting for the TVN acquisition is based on currently available information and is considered preliminary. Although the Company believes that the assumptions and estimates it has made are reasonable and appropriate, they are based in part on historical experience and information that may be obtained from the management of the acquired company and are inherently uncertain. Unanticipated events and circumstances may occur that may affect the accuracy or validity of such assumptions, estimates, or actual results. As a result, during the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded in the Company's Condensed Consolidated Statements of Operations. Significant Accounting Policies The Company’s significant accounting policies are described in Note 2 to its audited Consolidated Financial Statements included in the 2015 Form 10-K. There have been no significant changes to these policies during the six months ended July 1, 2016 .

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jul. 01, 2016
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS New standards to be implemented In May 2014, the Financial Accounting Standards Board (“FASB”) issued new authoritative guidance for revenue recognition, requiring an entity to recognize the amount of revenue that reflects the consideration to which it expects to be entitled for the transfer of promised goods or services to customers. The updated standard will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective and permits the use of either the retrospective or cumulative effect transition method. The original effective date for this new standard would have required the Company to adopt it beginning in its first quarter of fiscal 2017. In August 2015, the FASB issued an accounting standard update for the deferral of the effective date by one year to December 15, 2017 for interim and annual reporting periods beginning after that date and permits early adoption, but not before the original effective date of December 15, 2016. Accordingly, the Company may adopt the standard in either its first quarter of fiscal 2017 or fiscal 2018. The new revenue standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. The Company is currently evaluating the timing of its adoption and the impact of this new revenue standard on its consolidated financial statements. In addition, the FASB issued ASU 2016-08, ASU 2016-10, and ASU 2016-12 in March 2016, April 2016, and May 2016, respectively, to help provide interpretive clarifications on the new guidance in ASC Topic 606, Revenue from Contracts with Customers. The Company is in the process of assessing the impact these interpretive clarifications will have upon adoption, including determining the adoption method. In July 2015, the FASB issued an accounting standard update that requires inventory to be measured at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2017 and early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements. In January 2016, the FASB issued an accounting standard update which requires equity investments to be measured at fair value with changes in fair value recognized in net income and simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. The accounting standard update also updates certain presentation and disclosure requirements. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2018 and early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements. In February 2016, the FASB amended the existing accounting standard for lease accounting. Under this guidance, lessees and lessors should apply a “right-of-use” model in accounting for all leases (including subleases) and eliminate the concept of operating leases and off-balance sheet leases. This new accounting standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. The new standard will be effective for the Company beginning in the first quarter of fiscal 2019 and early adoption is permitted. The Company is currently evaluating the methods and impact of adopting this new accounting standard on its consolidated financial statements. In March 2016, the FASB issued an accounting standard update to clarify the requirements for assessing whether contingent call (put) options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. An entity performing the assessment under the amendments is required to assess the embedded call (put) options solely in accordance with the four-step decision sequence. The standard will be effective for the Company beginning in the first quarter of fiscal 2017 and early adoption is permitted. The adoption of this accounting standard update is not expected to have any impact on the financial statements of the Company. In March 2016, the FASB issued an accounting standard update for the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2017 and early adoption is permitted. The Company is currently evaluating the methods and impact of adopting the new accounting standard on its consolidated financial statements. In June 2016, the FASB issued new guidance that changes the impairment model for most financial assets and certain other instruments. For trade receivables and other instruments, the Company will be required to use a new forward-looking “expected loss” model. Additionally, credit losses on available-for-sale debt securities should be recorded through an allowance for credit losses limited to the amount by which fair value is below amortized cost. The new guidance will be effective for the Company beginning in the first quarter of fiscal 2019 and early adoption is permitted. The Company is currently evaluating the impact of adopting this new accounting guidance on its consolidated financial statements. Standards Implemented In April 2015, the FASB issued an accounting standard update that requires debt issuance costs to be presented as a direct deduction from the carrying amount of the related debt liability, consistent with the presentation of debt discounts. Prior to this accounting update, debt issuance costs were required to be presented as deferred charge assets, separate from the related debt liability. This accounting standard update does not change the recognition and measurement requirements for debt issuance costs. The Company early-adopted this accounting standard update as of the end of its fiscal 2015 in connection with the issuance of convertible senior notes in December 2015 (see Note 11, “Convertible Notes, Other Debts and Capital Leases”), resulting in the classification of $3.2 million of unamortized debt issuance costs as a deduction from long-term liability on its Consolidated Balance Sheet at December 31, 2015. Other than this transaction, the adoption of this accounting standard update did not have an impact on the Company’s consolidated financial statements. In April 2015, the FASB issued an accounting standard update on whether a cloud computing arrangement includes a software license. The guidance requires the accounting for a cloud computing arrangement that includes a software license element to be consistent with the accounting for acquisition of other software licenses. Cloud computing arrangement without software licenses are to be accounted for as a service contract. The Company adopted this accounting standard update beginning in the first quarter of fiscal 2016. The adoption of this standard update did not have a material impact on the Company’s consolidated financial statements. In November 2015, the FASB issued an accounting standard update that all deferred tax assets and liabilities, along with any related valuation allowance, be classified as non-current on the balance sheet. The Company prospectively early-adopted this accounting standard update as of the end of its fiscal 2015, resulting in $15.9 million of net deferred tax assets, along with its related valuation allowance, being classified as non-current on its Consolidated Balance Sheet at December 31, 2015. Other than this reclassification, the adoption of this accounting standard update did not have an impact on the Company’s consolidated financial statements. In September 2015, the FASB issued new guidance related to business combinations. The new guidance requires that any adjustments to provisional amounts in a business combination be recorded in the period such adjustments are determined, rather than retrospectively adjusting previously reported amounts. The Company adopted the amendments beginning in the first quarter of fiscal 2016. The adoption did not have a material impact on the Company's consolidated financial statements.

Business Acquisition

Business Acquisition	6 Months Ended
	Jul. 01, 2016
Business Acquisition, Pro Forma Information [Abstract]
Business Combination Disclosure [Text Block]	BUSINESS ACQUISITION On February 29, 2016, the Company, through its wholly-owned subsidiary Harmonic International AG, completed its acquisition of 100% of the share capital and voting rights of TVN, a global leader in advanced video compression solutions headquartered in Rennes, France. In the first quarter of 2016, the Company recorded a provisional purchase price of $84.6 million , including an estimated contingent consideration of approximately $8.0 million . In the second quarter of 2016, the Company recorded a $2.1 million reduction to the contingent consideration upon finalizing the pending post-closing adjustments and as a result, the purchase price was reduced to $82.5 million . Pursuant to the Securities Purchase Agreement entered into between the Company and the other parties thereto, dated February 11, 2016 (“TVN Purchase Agreement”), $13.5 million of the purchase consideration may remain in escrow for a period of up to 18 months and relates to certain indemnification obligations of TVN’s former equity holders. The TVN acquisition was primarily funded with cash proceeds from the issuance of convertible senior notes by the Company in December 2015. (See Note 11, “Convertible Notes, Other Debts and Capital Leases” for additional information on the notes). The Company believes that its acquisition of TVN has strengthened, and will continue to strengthen the Company’s competitive position in the video infrastructure market as well as to enhance the depth and scale of the Company’s research and development (“R&D”) and service and support capabilities in the video arena. The Company believes that the combined product portfolios, R&D teams and global sales and service personnel will allow the Company to accelerate innovation for its customers while leveraging greater scale to drive operational efficiencies. The TVN acquisition has been accounted for using the acquisition method of accounting in accordance with ASC 805, Business Combinations, which requires, among other things, that the assets acquired and liabilities assumed be recognized at their acquisition date fair values, with any excess of the consideration transferred over the estimated fair values of the identifiable net assets acquired recorded as goodwill. The accounting for this business combination is based on currently available information and is considered preliminary. The provisional purchase price has been allocated on a preliminary basis to tangible and intangible assets acquired and liabilities assumed on the basis of their respective estimated fair values on the acquisition date. The Company will continue to evaluate certain assets, liabilities and tax estimates that are subject to change within the measurement period (up to one year from the acquisition date). The Company’s preliminary allocation of the estimated purchase consideration as of July 1, 2016 was as follows (in thousands): Assets: Cash and cash equivalents $ 7,063 Accounts receivable, net 14,923 Inventories 3,462 Prepaid expenses and other current assets 4,442 Property and equipment, net 9,988 French R&D tax credit receivables (1) 26,421 Other long-term assets 1,824 Total assets $ 68,123 Liabilities: Other debts and capital leases, current 8,362 Accounts payable 13,963 Deferred revenue 2,504 Accrued liabilities 18,524 Other debts and capital leases, long-term 16,087 Other long-term liabilities 6,415 Deferred tax liabilities 952 Total liabilities $ 66,807 Goodwill 37,630 Intangibles 43,600 Total purchase consideration $ 82,546 (1) See Note 8, “Balance Sheet Components-Prepaid expenses and other current assets” for more information on French R&D tax credit receivables”. The following table presents details of the intangible assets acquired through this business combination (in thousands, except years): Estimated Useful Life (in years) Fair Value Backlog 6 months $ 3,600 Developed technology 4 years 21,400 Customer relationships 5 years 18,000 In-process research and development (1) N/A — Trade name 4 years 600 $ 43,600 (1) By the end of the second quarter of 2016, the Company completed the TVN in-process research and development activities and as a result, the in-process research and development of $1.0 million was reclassified to developed technology. Acquired identifiable intangible assets were valued using the income method and are amortized on a straight line basis over their respective estimated useful lives. Goodwill of $37.6 million arising from the acquisition was derived from expected benefits from the business synergies to be derived from the combined entities and the experienced workforce who joined the Company in connection with the acquisition. The goodwill will be assigned to the Company’s video reporting unit and it is not expected to be deductible for income tax purposes. The amortization for the developed technology is recorded in “Cost of revenues” for product and the amortization for the remaining intangibles is recorded in “Amortization of intangibles”, which are part of operating expenses, on the Condensed Consolidated Statement of Operations. The intangibles assets acquired will be assigned to the Company’s video reporting unit and are not expected to be deductible for income tax purposes. The Company also acquired an indefinite lived asset of $1.0 million which represents the fair value of in-process research and development activities that were estimated to be completed within six months of the acquisition date. The related research and development efforts were completed by the end of the second quarter of 2016 and the Company determined that it has become a finite lived intangible asset (developed technology) with an estimated useful life of four years. The results of operations of TVN are included in the Company’s Condensed Consolidated Statements of Operations beginning February 29, 2016. For the three months ended July 1, 2016 , $18.3 million of revenue and $ 6.9 million of gross margin from TVN were included in the Company’s Condensed Consolidated Statement of Operations. For the six months ended July 1, 2016 , $21.2 million of revenue and $7.1 million of gross margin from TVN were included in the Company’s Condensed Consolidated Statement of Operations. Since the Company is in the process of integrating TVN’s operations, the Company believes it is impracticable to determine TVN’s stand-alone income(loss) from operations and net income(loss) and these measures are not meaningful representations of TVN’s stand-alone performance. Acquisition-and integration-related expenses As a result of the TVN acquisition, the Company incurred acquisition-and integration-related expenses in aggregate of $3.4 million and $6.5 million for the three and six months ended July 1, 2016 , respectively. These costs consisted of acquisition-related costs which include outside legal, accounting and other professional services as well as integrated-related costs which include incremental costs resulting from the TVN acquisition that are not expected to generate future benefits once the integration is fully consummated. These costs are expensed as incurred. Acquisition-and integration-related expenses for the TVN acquisition is summarized in the table below (in thousands): Acquisition-related Integration-related Three months ended Six months ended Three months ended Six months ended July 1, 2016 July 1, 2016 Product cost of revenue $ — $ — $ 433 $ 491 Research and development — — 500 550 Selling, general and administrative 885 3,321 1,585 2,137 Total acquisition- and integration-related expenses in operating expenses 885 3,321 2,085 2,687 Total acquisition- and integration-related expenses $ 885 $ 3,321 $ 2,518 $ 3,178 Pro Forma Financial Information The following unaudited pro forma summary presents consolidated information of the Company as if the acquisition of TVN had occurred on January 1, 2015, the beginning of the comparable prior annual period. The unaudited pro forma combined results are provided for illustrative purpose only and are not indicative of the Company’s actual consolidation results. The pro forma adjustments primarily relate to the amortization of acquired intangibles and interest expense related to financing arrangements. In addition, the unaudited pro forma net loss for the three and six months ended July 3, 2015 was adjusted to include $3.4 million and $6.5 million of acquisition- and integration- related expenses, respectively; and $5.7 million and $8.1 million reduction in revenue related to the fair value adjustment of deferred revenue. The unaudited pro forma net loss for the six months ended July 1, 2016 was adjusted to exclude $6.5 million of acquisition- and integration- related expenses. These adjustments exclude the income tax impact. Three months ended Six months ended July 3, July 1, July 3, (in millions, except per share amounts) Net revenue $ 127.3 $ 200.1 $ 243.9 Net loss (8.9 ) (40.3 ) (27.9 ) Net loss per share-basic and diluted $ (0.10 ) $ (0.52 ) $ (0.31 )

Short-Term Investments

Short-Term Investments	6 Months Ended
	Jul. 01, 2016
Cash and Cash Equivalents [Abstract]
Short-Term Investments	SHORT-TERM INVESTMENTS The following table summarizes the Company’s short-term investments (in thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of July 1, 2016 Corporate bonds $ 13,752 $ 9 $ (1 ) $ 13,760 Total short-term investments $ 13,752 $ 9 $ (1 ) $ 13,760 As of December 31, 2015 Corporate bonds $ 25,557 $ — $ (52 ) $ 25,505 Commercial paper 1,099 — — 1,099 Total short-term investments $ 26,656 $ — $ (52 ) $ 26,604 The following table summarizes the maturities of the Company’s short-term investments (in thousands): July 1, 2016 December 31, 2015 Less than one year $ 12,424 $ 19,642 Due in 1 - 2 years 1,336 6,962 Total short-term investments $ 13,760 $ 26,604 These available-for-sale investments are presented as “Current Assets” in the Condensed Consolidated Balance Sheets as they are available for current operations. Realized gains and losses from the sale of investments for each of the three and six months ended July 1, 2016 and July 3, 2015 were not material. The Company’s investments in equity securities of other privately and publicly held companies were $5.4 million as of both July 1, 2016 and December 31, 2015 , and such investments were considered as long-term investments and were included in “Other assets” in the Condensed Consolidated Balance Sheet. (See Note 5, “Investments in Other Equity Securities” for additional information). Impairment of Short-term 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 July 1, 2016 . As of July 1, 2016 , 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.

Investments in Other Equity Sec

Investments in Other Equity Securities	6 Months Ended
	Jul. 01, 2016
Investments, All Other Investments [Abstract]
Investments in Equity Securities	INVESTMENTS IN OTHER EQUITY SECURITIES From time to time, the Company may acquire certain equity investments for the promotion of business objectives and these investments are classified as long-term investments and included in “Other assets” in the Condensed Consolidated Balance Sheet. On September 2, 2014, the Company acquired a 3.3% interest in Vislink plc (“Vislink”), a U.K. public company listed on the AIM exchange in London, for $3.3 million . The investment in Vislink is being accounted for as a cost method investment as the Company does not have significant influence over the operational and financial policies of Vislink. Since the Vislink investment is also an available-for-sale security, its value is marked to market for the difference in fair value at period end. The carrying value of Vislink was $1.8 million at both July 1, 2016 and December 31, 2015 , and Vislink’s accumulated unrealized loss, net of taxes was $60,000 and $1.5 million at July 1, 2016 and December 31, 2015 , respectively. The Company assessed this available-for-sale investment that was in a gross unrealized loss position on an individual basis to determine if the decline in fair value was other than temporary. The assessment as to the nature of a decline in fair value is based on, among other things, the length of time and the extent to which the market value has been less than the Company’s cost basis; the financial condition and near-term prospects of the investment; and the Company’s intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in market value. As a result of these assessments, it was determined that the decline in fair value of Vislink investment at December 31, 2015 was not other than temporary primarily due to the relatively short duration in which the fair value of the Vislink investment was less than the Company’s cost basis, and, as a result, the Company did not record any impairment charges as of December 31, 2015. Vislink’s $1.5 million accumulated unrealized loss, net of taxes, at December 31, 2015 was included in the Condensed Consolidated Balance Sheets as a component of “Accumulated other comprehensive income (loss)”. By May 2016, Vislink’s stock price had continued to be below the Company’s cost basis for approximately seven months. The prolonged decline in Vislink’s stock price led the Company to conclude the impairment was other than temporary. Furthermore, the Company’s assessment of Vislink's near-term prospects based on Vislink’s recent financial performance suggest that Vislink's stock price may not recover to the Company’s original cost basis in 2016. As a result, the Company recorded an impairment charge in the first quarter of 2016 of $1.5 million reflecting the new reduced cost basis of the Vislink investment at April 1, 2016. In the second quarter of 2016, based on Vislink’s stock price on July 1, 2016, the Company recorded an unrealized loss of $60,000 , net of taxes, on the Vislink investment included in the Consolidated Balance Sheet as a component of "Accumulated other income (loss)". Although at July 1, 2016, Vislink’s stock price did not deviate significantly from the reduced cost basis as at April 1, 2016, since July 6, 2016, Vislink’s stock price has decreased by approximately 50% . The Company will continue to monitor Vislink’s stock price and financial performance. A sustained decline in Vislink’s stock price may lead to further impairment later in 2016. The Company’s remaining maximum exposure to loss from the Vislink investment at July 1, 2016 was limited to its reduced investment cost of $1.8 million . Unconsolidated Variable Interest Entities VJU On September 26, 2014, the Company acquired a 19.8% interest in VJU iTV Development GmbH (“VJU”), a software company based in Austria, for $2.5 million . Since VJU’s equity is deemed not sufficient to permit it to finance its activities without additional support from its shareholders, VJU is considered a variable interest entity (“VIE”). The Company determined that it is not the primary beneficiary of VJU because its financial interest in VJU’s equity and its research and development agreement with VJU do not empower the Company to direct VJU’s activities that will most significantly impact VJU’s economic performance. VJU is accounted for as a cost method investment as the Company does not have significant influence over the operational and financial policies of VJU. The Company attended a VJU board meeting on March 5, 2015 as an observer. At that meeting, the Company was made aware of significant decreases in VJU’s business prospects, VJU’s existing working capital and prospects for additional funding, compared to the prior information the Company had received from VJU. Based on the Company’s assessment, the Company determined that its investment in VJU was impaired on an other-than-temporary basis. Factors considered included the severity of the impairment and recent events specific to VJU. Based on the Company’s assessment of VJU’s expected cash flows, the entire investment is expected to be non-recoverable. As a result, the Company recorded an impairment charge of $2.5 million in the first quarter of 2015. The Company’s impairment loss in VJU is limited to its initial cost of investment of $2.5 million as well as the $0.1 million research and development cost expensed in September 2014. At VJU’s shareholders meeting held on October 15, 2015, additional contributions by existing shareholders were approved. The Company did not provide additional contributions to VJU, and as a result, the Company’s equity interest in VJU decreased from to 19.8% to 9.9% . EDC On October 22, 2014, the Company acquired an 18.4% interest in Encoding.com, Inc. (“EDC”), a video transcoding service company headquartered in San Francisco, California, for $3.5 million by purchasing EDC’s Series B preferred stock. Since EDC’s equity is deemed not sufficient to permit it to finance its activities without additional support from its shareholders, EDC is considered a VIE. The Company determined that it is not the primary beneficiary of EDC because its financial interest in EDC’s equity does not empower the Company to direct EDC’s activities that will most significantly impact EDC’s economic performance. In addition, the Company determined that its investment in EDC’s Series B preferred stock does not have the risk and reward characteristics that are substantially similar to EDC’s common stock. Therefore, Harmonic does not hold an investment in EDC’s common stock or in-substance common stock. According to the applicable accounting guidance, the EDC investment is accounted for as a cost-method investment. The Company determined that there were no indicators existing at July 1, 2016 that would indicate that the EDC investment was impaired. The following table presents the carrying values and maximum exposure of the unconsolidated VIEs as of July 1, 2016 (in thousands): Carrying Value Maximum exposure to loss (1) VJU $ — $ — EDC (2) 3,593 3,593 Total $ 3,593 $ 3,593 (1) The Company did not provide financial support to any of its unconsolidated VIEs and as of July 1, 2016 , there were no explicit arrangements or implicit variable interests that could require the Company to provide financial support to any of its unconsolidated VIEs. (2) The Company’s maximum exposure to loss with respect to EDC as of July 1, 2016 was limited to a total investment cost of $3.6 million , including $0.1 million of transaction costs. Each reporting period, the Company reviews all of its unconsolidated VIE investments to determine whether there are any reconsideration events that may result in the Company being a primary beneficiary of any unconsolidated VIE which would then require the Company to consolidate the VIE. The Company also reviews all of its cost-method investments in each reporting period to determine whether a significant event of change in circumstances has occurred that may have an adverse effect on the fair value of each investment.

Derivative and Hedgiing Activit

Derivative and Hedgiing Activities Derivative and Hedging Activities	6 Months Ended
	Jul. 01, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure	DERIVATIVES AND HEDGING ACTIVITIES The Company uses forward contracts to manage exposures to foreign currency exchange rates. The Company’s primary objective in holding derivative instruments is to reduce the volatility of earnings and cash flows associated with fluctuations in foreign currency exchange rates and the Company does not use derivative instruments for trading purposes. The use of derivative instruments expose the Company to credit risk to the extent that the counterparties may be unable to meet their contractual obligations, as such, the potential risk of loss with any one counterparty is closely monitored by the Company. Derivatives Designated as Hedging Instruments (Cash Flow Hedges) Beginning in December 2014, the Company entered into forward currency contracts to hedge forecasted operating expenses and service costs related to employee salaries and benefits denominated in Israeli shekels (“ILS”) for its subsidiaries in Israel. These ILS forward contracts mature generally within 12 months and are designated as cash flow hedges. For derivatives that are designated as hedges of forecasted foreign currency denominated operating expenses and service costs, the Company assesses effectiveness based on changes in spot currency exchange rates. Changes in spot rates on the derivative are recorded as a component of “Accumulated other comprehensive income (loss)” (“AOCI”) in the Condensed Consolidated Balance Sheets until such time as the hedged transaction impacts earnings. The change in fair value of the forward points, which reflects the interest rate differential between the two countries on the derivative, is excluded from the effectiveness assessment. Gains or losses on the derivative representing either hedge ineffectiveness or hedge components excluded from the assessment of effectiveness are recognized in current earnings. Derivatives Not Designated as Hedging Instruments (Balance Sheet Hedges) Balance sheet hedges consist of foreign currency forward contracts, mature generally within three months, are carried at fair value and they are used to minimize the short-term impact of foreign currency exchange rate fluctuation on cash and certain trade and inter-company receivables and payables. Changes in the fair value of these foreign currency forward contracts are recognized in “Other income (expense), net” in the Condensed Consolidated Statement of Operations and are largely offset by the changes in the fair value of the assets or liabilities being hedged. The locations and amounts of designated and non-designated derivative instruments’ gains and losses reported in the Company’s Accumulated Other Comprehensive Income (Loss) and Condensed Consolidated Statements of Operations were as follows (in thousands): Three months ended Six months ended Financial Statement Location July 1, 2016 July 3, 2015 July 1, 2016 July 3, 2015 Derivatives designated as hedging instruments: Gains (losses) in AOCI on derivatives (effective portion) AOCI $ (165 ) $ 516 $ 158 $ 332 Gains (losses) reclassified from AOCI into income (effective portion) Cost of Revenue $ (3 ) $ 19 $ (13 ) $ 26 Operating Expense (19 ) 119 (87 ) 161 Total $ (22 ) $ 138 $ (100 ) $ 187 Losses recognized in income on derivatives (ineffectiveness portion and amount excluded from effectiveness testing) Other income (expense), net $ (22 ) $ (10 ) $ (49 ) $ (52 ) Derivatives not designated as hedging instruments: Gains (losses) recognized in income Other income (expense), net $ (50 ) $ 133 $ (334 ) $ 385 The Company anticipates the AOCI balance of $12,000 at July 1, 2016 , relating to net unrealized gains from cash flow hedges, will be reclassified to earnings within the next twelve months. The U.S. dollar equivalents of all outstanding notional amounts of foreign currency forward contracts are summarized as follows (in thousands): July 1, 2016 December 31, 2015 Derivatives designated as cash flow hedges: Purchase $ 6,001 $ 12,984 Derivatives not designated as hedging instruments: Purchase $ 4,048 $ 6,942 Sell $ 14,854 $ 11,332 The locations and fair value amounts of the Company’s derivative instruments reported in its Condensed Consolidated Balance Sheets are as follows (in thousands): Asset Derivatives Derivative Liabilities Balance Sheet Location July 1, 2016 December 31, 2015 Balance Sheet Location July 1, 2016 December 31, 2015 Derivatives designated as hedging instruments: Foreign currency contracts Prepaid expenses and other current assets $ 23 $ 13 Accrued Liabilities $ 51 $ 281 $ 23 $ 13 $ 51 $ 281 Derivatives not designated as hedging instruments: Foreign currency contracts Prepaid expenses and other current assets $ 36 $ 100 Accrued Liabilities $ 74 $ 90 $ 36 $ 100 $ 74 $ 90 Total derivatives $ 59 $ 113 $ 125 $ 371 Offsetting of Derivative Assets and Liabilities The Company recognizes all derivative instruments on a gross basis in the Condensed Consolidated Balance Sheets. However, the arrangements with its counterparties allows for net settlement, which are designed to reduce credit risk by permitting net settlement with the same counterparty. As of July 1, 2016 , information related to the offsetting arrangements was as follows (in thousands): Gross Amounts of Derivatives Not Offset in the Condensed Consolidated Balance Sheets Gross Amounts of Derivatives Gross Amounts of Derivatives Offset in the Condensed Consolidated Balance Sheets Net Amounts of Derivatives Presented in the Condensed Consolidated Balance Sheets Financial Instrument Cash Collateral Pledged Net Amount Derivative Assets $ 59 — $ 59 $ (36 ) — $ 23 Derivative Liabilities $ 125 — $ 125 $ (36 ) — $ 89 In connection with foreign currency derivatives entered in Israel, the Company’s subsidiaries in Israel are required to maintain a compensating balance with their bank at the end of each month. The compensating balance arrangements do not legally restrict the use of cash and as of July 1, 2016 , the total compensating balance maintained was $2.5 million .

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jul. 01, 2016
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. The fair value of the Company’s convertible notes is influenced by interest rates, the Company’s stock price and stock market volatility. The estimated fair value of the Company’s convertible notes based on a market approach was approximately $100.9 million and $123.1 million as of July 1, 2016 and December 31, 2015, respectively, and represents a Level 2 valuation. The Company’s other debts and capital leases assumed from the TVN acquisition are classified within Level 2 because these borrowings are not actively traded and the majority of them have a variable interest rate structure based upon market rates currently available to the Company for debt with similar terms and maturities. Additionally, the Company considers the carrying amount of its capital lease obligations to approximate their fair value because the weighted average interest rate used to formulate the carrying amounts approximates current market rates. The other debts and capital leases outstanding as of July 1, 2016 were $24.0 million in the aggregate. (See Note 11, “Convertible Notes, Other debts and Capital Leases” for additional information). The Company’s liabilities for the TVN contingent consideration under the TVN Purchase Agreement as of July 1, 2016 is classified within Level 3 because these valuations are based on management assumptions, including discount rates and estimated probabilities of achievement of certain events which are unobservable in the market. The Company’s liability for TVN contingent consideration was $2.5 million and $8.0 million , respectively, as of July 1, 2016 and April 1, 2016. The $5.5 million reduction in the second quarter of 2016 was primarily due to a $3.5 million partial settlement and a $2.0 million adjustment upon finalizing the pending post-closing adjustments. The liabilities for the assumed TVN employee equity plans of approximately $2.9 million were fully paid in the second quarter of 2016 and there were no other outstanding amounts under these plans at July 1, 2016. During the six months ended July 1, 2016 , 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 on a recurring basis based on the three-tier fair value hierarchy (in thousands): Level 1 Level 2 Level 3 Total As of July 1, 2016 Cash equivalents Money market funds $ 8,433 $ — $ — $ 8,433 Short-term investments Corporate bonds — 13,760 — 13,760 Prepaids and other current assets Time deposit pledged for credit card facility — 580 — 580 Derivative assets — 59 — 59 Other assets Long-term investment 1,810 — — 1,810 Total assets measured and recorded at fair value $ 10,243 $ 14,399 $ — $ 24,642 Accrued liabilities Derivative liabilities — 125 — 125 Total liabilities measured and recorded at fair value $ — $ 125 $ — $ 125 Level 1 Level 2 Level 3 Total As of December 31, 2015 Cash equivalents Money market funds $ 53,434 $ — $ — $ 53,434 U.S. Treasury bills 24,998 — — 24,998 Short-term investments Corporate bonds — 25,505 — 25,505 Commercial paper — 1,099 — 1,099 Prepaids and other current assets Time deposit pledged for credit card facility — 580 — 580 Derivative assets — 113 — 113 Other assets Long-term investment 1,840 — — 1,840 Total assets measured and recorded at fair value $ 80,272 $ 27,297 $ — $ 107,569 Accrued liabilities Derivative liabilities $ — $ 371 $ — $ 371 Total liabilities measured and recorded at fair value $ — $ 371 $ — $ 371

Balance Sheet Components

Balance Sheet Components	6 Months Ended
	Jul. 01, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Components	BALANCE SHEET COMPONENTS The following tables provide details of selected balance sheet components (in thousands): July 1, 2016 December 31, 2015 Accounts receivable, net: Accounts receivable $ 107,558 $ 73,855 Less: allowances for doubtful accounts, returns and discounts (4,890 ) (4,340 ) Total $ 102,668 $ 69,515 July 1, 2016 December 31, 2015 Prepaid expenses and other current assets: Prepaid inventories to contract manufacturer (1) $ 8,500 $ 8,500 Prepaid maintenance, royalty, rent and property taxes 6,530 5,974 Other Prepayments 7,242 2,762 Deferred cost of revenue 10,353 4,601 French R&D tax credits receivable (2) 6,203 — Restricted cash (3) 1,328 1,093 Other 3,161 2,073 Total $ 43,317 $ 25,003 (1) From time to time, the Company makes advance payment to a supplier for future inventory in order to secure more favorable pricing. The Company anticipates that this amount will be offset in the first quarter of 2017 against the accounts payable owed to this supplier. (2) The Company’s acquired TVN subsidiary in France (the “TVN French Subsidiary”) participates in the French Crédit d’Impôt Recherche (“CIR”) program (the “R&D tax credits”) which allows companies to monetize eligible research expenses. The French R&D tax credits can be used to offset against income tax payable to the French government in each of the four years after being incurred, or if not utilized, are recoverable in cash. The amount of French R&D tax credits recoverable are subject to audit by the French government and during the second quarter of 2016, the French government approved the 2012 claim and refunded $5.8 million to the TVN French Subsidiary. The remaining R&D tax credit receivables at July 1, 2016 were approximately $23.1 million and are expected to be recoverable from 2017 through 2020 with $6.2 million reported under “Prepaid and other Current Assets” and $16.9 million reported under “Other Long-term Assets” on the Company’s Condensed Consolidated Balance Sheets. Pursuant to the TVN Purchase Agreement, the Company is indemnified by the selling shareholders with respect to the validity and recoverability of the outstanding TVN French Subsidiary R&D tax credit receivables. (3) The restricted cash balances are primarily held as cash collateral security for certain bank guarantees. These restricted funds are invested in bank deposits and cannot be withdrawn from the Company’s accounts without the prior written consent of the applicable secured party. Additionally, as of July 1, 2016, the Company recorded approximately $1.1 million of restricted cash for the bank guarantee associated with the TVN French Subsidiary’s office building lease. This amount is reported under “Other Long-term Assets” on the Company’s Condensed Consolidated Balance Sheets. July 1, 2016 December 31, 2015 Inventories: Raw materials $ 7,824 $ 5,421 Work-in-process 1,186 1,950 Finished goods 15,640 19,827 Service-related spares 11,974 11,621 Total $ 36,624 $ 38,819 July 1, 2016 December 31, 2015 Property and equipment, net: Furniture and fixtures $ 9,026 $ 7,808 Machinery and equipment 96,257 93,010 Capitalized software 34,428 29,391 Leasehold improvements 13,891 10,000 Property and equipment, gross 153,602 140,209 Less: accumulated depreciation and amortization (117,085 ) (113,197 ) Total $ 36,517 $ 27,012 July 1, 2016 December 31, 2015 Accrued Liabilities: Accrued employee compensation and related expenses $ 18,379 $ 12,083 Accrued sales and use tax and property taxes 3,540 1,743 Accrued TVN contingent consideration (1) 2,483 — Accrued warranty 5,095 3,913 Accrued royalty payments 2,487 873 Contingent inventory reserves 3,649 1,315 Customer deposits and accrued customer rebates 4,319 1,851 Others 12,394 9,576 Total $ 52,346 $ 31,354 (1) The TVN acquisition is subject to post-closing adjustments as set forth in the TVN Purchase Agreement to be determined within 90 days from the acquisition date in amounts capped to (i) the difference between €76 million (approximately $83.3 million as converted from euros into U.S. dollars using an agreed upon average exchange rate) and $75 million , with respect to an adjustment based on TVN’s 2015 revenue, and (ii) up to $5 million with respect to an adjustment based on TVN’s 2015 backlog that ships during the first half of 2016. During the second quarter of 2016, the Company paid $3.5 million upon the finalization of the revenue and working capital adjustments. The remaining backlog adjustment amount has been finalized at $2.5 million and will be paid in the third quarter of 2016.

Goodwill and Identified Intangi

Goodwill and Identified Intangible Assets	6 Months Ended
	Jul. 01, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Identified Intangible Assets	GOODWILL AND IDENTIFIED INTANGIBLE 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 goodwill impairment at the reporting unit level on an annual basis, or more frequently if events or changes in circumstances indicate that the asset is more likely than not impaired. The Company’s annual goodwill impairment test is performed in the fiscal fourth quarter, with a testing date at the end of October. In the first quarter of 2016, the Company preliminary recorded additional goodwill of $39.2 million related to the TVN acquisition based on the preliminary allocation of the estimated purchase consideration. The Company adjusted the goodwill to $37.6 million in the second quarter of 2016 primarily due to a $2.0 million reduction in the estimate of the contingent purchase consideration, and, to a lesser extent, changes to certain assets, liabilities and tax estimates. (See Note 3, “Business Acquisition” for additional information). The Company will continue to evaluate certain assets, liabilities and tax estimates that are subject to change within the measurement period (up to one year from the acquisition date). Goodwill from the TVN acquisition was assigned to the Video reporting unit. The following table presents goodwill by reportable segments (in thousands): Video Cable Edge Total As of December 31, 2015 $ 136,904 $ 60,877 $ 197,781 Preliminary estimate of goodwill from TVN acquisition 37,630 — 37,630 Foreign currency translation adjustment 26 (68 ) (42 ) As of July 1, 2016 $ 174,560 $ 60,809 $ 235,369 The Company performs its annual goodwill impairment review of its two reporting units, which are the same as its operating segments, during the fourth fiscal quarter of 2015. The 2015 annual testing concluded that goodwill was not impaired as the Video and Cable Edge reporting units had estimated fair values in excess of their carrying value by approximately 87% and 42% , respectively. A significant decline in a company’s stock price may suggest that an adverse change in the business climate may have caused the fair value of one or more reporting units to fall below their carrying value. During the second quarter of 2016, the sustained decline in the Company’s stock price led to a triggering event for goodwill impairment assessment. As of July 1, 2016, with a closing stock price of $3.01 on the NASDAQ stock exchange, the Company’s market capitalization was approximately $235 million . As this market capitalization was less than the Company’s net book value, further analysis was performed to determine if an impairment exists. When assessing goodwill for impairment, the Company used multiple valuation methodologies to determine its enterprise value. The valuation methods used included the Company’s market capitalization adjusted for a control premium and the Company’s discounted cash flow analysis, which involves making significant assumptions and estimates, including expectations of the Company’s future financial performance, the Company’s weighted average cost of capital and the Company’s interpretation of currently enacted tax laws. Based on the impairment test performed, management determined that the Company’s goodwill was not impaired as of July 1, 2016. The Company believes that the fluctuation in market capitalization is driven by general market movement and not Company specific factors. The Company has not recorded any impairment charges related to goodwill for any prior periods. Intangible Assets In the six months ended July 1, 2016 , the gross amount for intangible assets increased $43.8 million due to the TVN acquisition. The following is a summary of intangible assets (in thousands): July 1, 2016 December 31, 2015 Weighted Average Remaining Life (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed core technology 3.7 $ 32,489 $ (12,695 ) $ 19,794 $ 10,987 $ (10,987 ) $ — Customer relationships/contracts 4.4 47,286 (29,392 ) 17,894 29,200 (25,752 ) 3,448 Trademarks and trade names 3.7 603 (50 ) 553 — — — Maintenance agreements and related relationships 0.2 5,500 (5,309 ) 191 5,500 (4,851 ) 649 Order Backlog 0.2 3,617 (2,411 ) 1,206 — — — Total identifiable intangibles $ 89,495 $ (49,857 ) $ 39,638 $ 45,687 $ (41,590 ) $ 4,097 The TVN in-process research and development efforts were completed by the end of the second quarter of 2016 and the Company determined that it has become a finite lived intangible asset (developed technology) with an estimated useful life of four years. Amortization expense for the identifiable purchased intangible assets for the three and six months ended July 1, 2016 and July 3, 2015 was allocated as follows (in thousands): Three months ended Six months ended July 1, July 3, July 1, July 3, Included in cost of revenue $ 1,307 $ 86 $ 1,725 $ 547 Included in operating expenses 4,232 1,446 6,597 2,892 Total amortization expense $ 5,539 $ 1,532 $ 8,322 $ 3,439 The estimated future amortization expense of purchased intangible assets with definite lives is as follows (in thousands): Cost of Revenue Operating Expenses Total Year ended December 31, 2016 (remaining six months) $ 2,688 $ 4,295 $ 6,983 2017 5,376 3,768 9,144 2018 5,376 3,768 9,144 2019 5,376 3,768 9,144 2020 978 3,642 4,620 Thereafter — 603 603 Total future amortization expense $ 19,794 $ 19,844 $ 39,638

Restructuring and Related Charg

Restructuring and Related Charges	6 Months Ended
	Jul. 01, 2016
Restructuring and Related Activities [Abstract]
Restructuring and Related Charges	RESTRUCTURING AND RELATED CHARGES The Company implemented several restructuring plans in the past few years. The goal of these plans was to bring operational expenses to appropriate levels relative to its net revenues, while simultaneously implementing extensive company-wide expense control programs. The Company accounts for its restructuring plans under the authoritative guidance for exit or disposal activities. The restructuring and asset impairment charges are included in “Product cost of revenue” and “Operating expenses-restructuring and related charges” in the Condensed Consolidated Statements of Operations. The following table summarizes the restructuring and asset impairment charges (in thousands): Three months ended Six months ended July 1, July 3, July 1, July 3, Restructuring and asset impairment charges in: Product cost of revenue $ 6 $ — $ (23 ) $ — Operating expenses-Restructuring and related charges 1,903 185 4,515 229 Total restructuring and related charges $ 1,909 $ 185 $ 4,492 $ 229 Harmonic 2016 Restructuring In the first quarter of 2016, the Company implemented a new restructuring plan (the “Harmonic 2016 Restructuring Plan”) to streamline the corporate organization, thereby reducing operating costs by consolidating duplicative resources in connection with the acquisition of TVN. The planned activities have primarily resulted, and will primarily result, in cash expenditures related to severance and related benefits and exiting certain operating facilities and disposing of excess assets. The Company anticipates spending approximately $22 million to $24 million in 2016, in aggregate, on the Harmonic 2016 Restructuring Plan and TVN acquisition- and integration-related expenses. The activities under the Harmonic 2016 Restructuring Plan are expected to take at least 12 months to complete and the estimated synergies from this plan and the TVN integration effort is approximately $20 million to $22 million , which the Company anticipates within two years. The Company recorded $1.9 million and $4.5 million of restructuring and related charges under the Harmonic 2016 Restructuring Plan, in the three and six months ended July 1, 2016 , respectively. The restructuring and related charges in the three months ended July 1, 2016 consisted of $1.9 million of severance and benefits for the termination of eight employees worldwide. The restructuring and related charges in the six months ended July 1, 2016 consisted of $1.4 million of costs related to the Company exiting an excess facility at its U.S. headquarters, $3.0 million of severance and benefits for the termination of 21 employees worldwide and $0.2 million of other charges. The Company incurred $3.4 million and $6.5 million of TVN acquisition- and integration-related expenses in the three and six months ended July 1, 2016 , respectively. (See Note 3, “Business Acquisition” for additional information on TVN acquisition-and integration-related expenses). In January 2016, the Company exited an excess facility at its U.S. headquarters in San Jose, California and recorded $1.4 million in facility exit costs. The Company accounts for facility exit costs in accordance with ASC 420, “Exit or Disposal Cost Obligations”, which requires that a liability for such costs be recognized and measured initially at fair value on the cease-use date based on remaining lease rentals, adjusted for the effects of any prepaid or deferred items recognized, reduced by the estimated sublease rentals that could be reasonably obtained even if it is not the intent to sublease. The fair value of these liabilities is based on a net present value model using a credit-adjusted risk-free rate. The liability will be paid out over the remainder of the leased properties’ terms, which continue through August 2020. Actual sublease terms may differ from the estimates originally made by the Company. Any future changes in the estimates or in the actual sublease income could require future adjustments to the liabilities, which would impact net income in the period the adjustment is recorded. As of the cease-use date, the fair value of this restructuring liability totaled $2.5 million . Offsetting these charges was an adjustment for deferred rent liability relating to this space of $1.1 million . In the second quarter of 2016, the Company initiated a consultative process with the works council for the acquired French subsidiary and applicable union representatives to establish a voluntary departure plan to enable French employees of TVN to voluntarily terminate with certain benefits. The Company expects the consultation process and the terms of the voluntary departure plan to be finalized in the third quarter of 2016. The following table summarizes the activity in the Company’s restructuring accrual related to the Harmonic 2016 Restructuring Plan during the six months ended July 1, 2016 (in thousands): Excess facilities Severance and benefits (1) Other charges Total Charges for 2016 Harmonic Restructuring Plan $ 1,418 $ 2,893 $ 246 $ 4,557 Reclassification of deferred rent 1,087 — — 1,087 Cash payments (468 ) (1,331 ) — (1,799 ) Non-cash write-offs — — (246 ) (246 ) Foreign exchange gain (loss) — (5 ) — (5 ) Balance at July 1, 2016 $ 2,037 $ 1,557 $ — $ 3,594 (1) The Company anticipates that the remaining severance and benefits accrual at July 1, 2016 will be substantially paid out by the end of 2016. Harmonic 2015 Restructuring In the fourth quarter of 2014, the Company implemented a restructuring plan (the “Harmonic 2015 Restructuring Plan”) to reduce 2015 operating costs and the planned restructuring activities involve headcount reduction, exiting certain operating facilities and disposing of excess assets. The Company recorded $2.2 million and $1.5 million of restructuring and impairment charges under the Harmonic 2015 Restructuring Plan in fiscal 2014 and 2015, respectively, consisting primarily of severance and benefits for the termination of 56 employees worldwide as well as a fixed asset impairment charge related to software development costs incurred for a discontinued information technology (“IT”) project. No new activities are anticipated in 2016 for the Harmonic 2015 Restructuring Plan and the remaining restructuring accrual for this plan is expected to be fully settled in the third quarter of 2016. The following table summarizes the activity in the Company’s restructuring accrual related to the Harmonic 2015 Restructuring Plan during the six months ended July 1, 2016 (in thousands): Severance and benefits (2) Balance at December 31, 2015 $ 264 Adjustments to restructuring provisions (65 ) Cash payments (194 ) Balance at July 1, 2016 $ 5 (2) The Company anticipates that the remaining restructuring accrual as of July 1, 2016 will be fully settled in the third quarter of 2016.

Convertible Notes, Other Debts

Convertible Notes, Other Debts And Capital Leases	6 Months Ended
	Jul. 01, 2016
Debt Disclosure [Abstract]
Convertible Notes, Other Debts And Capital Leases	CONVERTIBLE NOTES, OTHER DEBTS AND CAPITAL LEASES 4.00% Convertible Senior Notes In December 2015, the Company issued $128.25 million aggregate principal amount of unsecured convertible senior notes due 2020 (the “offering” or “Notes”, as applicable) through a private placement with a financial institution. The Notes do not contain any financial covenants. The Notes bear interest at a fixed rate of 4.00% per year, payable semiannually in arrears on June 1 and December 1 of each year, beginning on June 1, 2016. The Notes will mature on December 1, 2020, unless earlier repurchased or converted. The Company incurred approximately $4.1 million of debt issuance cost, of which $3.5 million was paid in 2015 and the remainder was paid in the first quarter of 2016. Concurrent with the closing of the offering, the Company used $49.9 million of the net proceeds to repurchase 11.1 million shares of the Company’s common stock from purchasers of the offering in privately negotiated transactions effected through the initial purchaser or its affiliate as the Company’s agent. Additionally, the Company used the remaining net proceeds from the offering to fund the TVN acquisition, which closed on February 29, 2016. Subject to satisfaction of certain conditions and during certain periods, the Notes will be convertible at the option of holders into cash, shares of the Company’s common stock or a combination thereof, at the Company’s election, at an initial conversion rate of 173.9978 shares of Common Stock per $1,000 principal amount of Notes (which is equivalent to an initial conversion price of approximately $5.75 per share). The conversion rate and the corresponding conversion price will be subject to adjustment upon the occurrence of certain events. Prior to September 1, 2020, the Notes will be convertible only under the following circumstances: (1) during any fiscal quarter commencing after the fiscal quarter ending on April 1, 2016 (and only during such fiscal quarter), if the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price of the Notes on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “ measurement period ”) in which the trading price per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day; or (3) upon the occurrence of specified corporate events. Commencing on September 1, 2020 until the close of business on the second scheduled trading day immediately preceding the maturity date, the Notes will be convertible in multiples of $1,000 principal amount regardless of the foregoing circumstances. If a fundamental change occurs, holders of the Notes may require the Company to purchase all or any portion of their Notes for cash at a repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date. In addition, if specific corporate events occur prior to the maturity date, the conversion rate may be increased for a holder who elects to convert the Notes in connection with such a corporate event. In accounting for the issuance of the Notes, the Company separated the Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the initial proceeds of the Notes as a whole. The difference between the initial proceeds of the Notes and the liability component (the “debt discount”) of $26.9 million is amortized to interest expense using the effective interest method over the term of the Notes. The equity component of the Notes is included in additional paid-in capital in the Consolidated Balance Sheets and is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the transaction costs related to the issuance of the Notes, the Company allocated the total amount of $4.1 million incurred to the liability and equity components using the same proportions as the proceeds from the Notes. Transaction costs attributable to the liability component were $3.2 million and were recorded as a direct deduction from the carrying amount of the debt liability in long-term liability in the Condensed Consolidated Balance Sheets and are being amortized to interest expense in the Condensed Consolidated Statements of Operations using the effective interest method over the term of the Notes. Transaction costs attributable to the equity component were $0.9 million and were netted with the equity component of the Notes in additional paid-in capital in the Condensed Consolidated Balance Sheets. The following table presents the components of the Notes as of July 1, 2016 and December 31, 2015 (in thousands, except for years and percentages): July 1, 2016 December 31, 2015 Liability: Principal amount $ 128,250 $ 128,250 Less: Debt discount, net of amortization (24,575 ) (26,732 ) Less: Debt issuance costs, net of amortization (2,963 ) (3,223 ) Carrying amount $ 100,712 $ 98,295 Remaining amortization period (years) 4.4 4.9 Effective interest rate on liability component 9.94 % 9.94 % Equity: Value of conversion option $ 26,925 $ 26,925 Less: Equity issuance costs (863 ) (863 ) Carrying amount $ 26,062 $ 26,062 The following table presents interest expense recognized for the Notes (in thousands): Three months ended Six months ended July 1, 2016 July 3, 2015 July 1, 2016 July 3, 2015 Contractual interest expense $ 1,282 $ — $ 2,565 $ — Amortization of debt discount 1,098 — 2,157 — Amortization of debt issuance costs 132 — 260 — Total interest expense recognized $ 2,512 $ — $ 4,982 $ — Other Debts and Capital Leases In connection with the TVN acquisition, the Company assumed a variety of debt and credit facilities in France to satisfy the financing requirements of TVN operations. These arrangements are summarized in the table below (in thousands): July 1, 2016 Financing from French government agencies related to various government incentive programs (1) $ 18,977 Term loans (2) 1,616 Secured borrowings (3) 1,100 Obligations under capital leases 2,326 Total debt obligations 24,019 Less: current portion (7,829 ) Long-term portion $ 16,190 Other than the 4.00% Notes, the Company did not have any other indebtedness as of December 31, 2015. (1) As of July 1, 2016 , the Company’s TVN French Subsidiary had an aggregate of $19.0 million of loans due to various financing programs of French government agencies, $15.4 million of which is related to loans backed by French R&D tax credit receivables. As of July 1, 2016 , the TVN French Subsidiary had an aggregate of $23.1 million of R&D tax credit receivables from the French government from 2017 through 2020. (See Note 8, “Balance Sheet Components-Prepaid expenses and other current assets” for more information). The R&D tax loans have a fixed rate of 0.6% , plus EURIBOR 1 month + 1.3% and matures between 2017 through 2019. The remaining loans of $3.6 million at July 1, 2016 primarily relates to financial support from French government agencies for R&D innovation projects at minimal interest rates and these loans mature between 2020 through 2023. (2) One of the term loans with a certain financial institution contains annual covenants that require the TVN French Subsidiary to maintain a minimum working capital balance and various other financial covenants and restrictions that limit the French Subsidiary’s ability to incur additional indebtedness. The annual covenant is based on French statutory year-end results and the French subsidiary was in compliance for 2015. (3) The TVN French Subsidiary obtained advances under a credit line with BPI France against a pool of eligible receivables with recourse. The maximum advance under this credit line for receivables is €2 million (approximately $2.2 million as converted using the exchange rate at July 1, 2016), less applicable fees, and €200,000 (approximately $0.2 million as converted using the exchange rate at July 1, 2016) of cash is pledged for this program. This credit line was renewed in July 2016 for an additional year with no material change to the terms of the credit agreement. The TVN French Subsidiary also entered into an accounts receivable financing agreement with GE Capital Cofacredit, (“GE”) on September 27, 2013, which is subject to automatic renewal unless cancelled. GE advances up to 90% of qualified customer invoices and holds the remaining 10% as a guarantee fund up with a minimum of €80,000 (approximately $0.1 million as converted using the exchange rate at July 1, 2016). In addition, another 10% of outstanding receivables is set aside in a holdback receivable and released upon payments received from the customers. These arrangements are treated as secured borrowings in accordance with FASB ASC 860, Transfers and Servicing . Future minimum repayments The table below shows the future minimum repayments of debts and capital lease obligations as of July 1, 2016 (in thousands): Years ending December 31, Capital lease obligations Debt obligations 2016 (remaining six months) $ 590 $ 1,354 2017 1,116 5,622 2018 527 5,779 2019 67 6,662 2020 26 665 Thereafter — 1,611 Total $ 2,326 $ 21,693 Credit Facilities The Company’s credit agreement with JPMorgan expired on February 20, 2016 and the Company did not renew the agreement or enter into any new credit agreement.

Employee Benefit Plans and Stoc

Employee Benefit Plans and Stock-based Compensation	6 Months Ended
	Jul. 01, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee Benefit Plans and Stock-based compensation	EMPLOYEE BENEFIT PLANS AND STOCK-BASED COMPENSATION The Company’s stock benefit plans include the employee stock purchase plan and current active stock plans adopted in 1995 and 2002 as well as one stock plan in connection with an acquisition in 2010. See Note 13, “Employee Benefit Plans and Stock-based Compensation” of Notes to Consolidated Financial Statements in the 2015 Form 10-K for details pertaining to each plan. The Company also assumed two existing TVN’s employee equity benefit plans in connection with the TVN acquisition. Stock Options and RSUs In connection with the Company’s acquisition of TVN, the Company agreed to make grants of restricted stock units (“RSUs”) with respect to a total of up to 1,750,000 shares (taking into account the share count provision for RSUs in the Company’s 1995 Stock Plan). The Company’s stockholders approved an amendment to the 1995 Stock Plan at the Company’s 2016 annual meeting of stockholders (“2016 Annual Meeting”) which increased the number of shares of common stock reserved for issuance under the 1995 Stock Plan by 2,000,000 shares. The following table summarizes the Company’s stock option and RSU activities during the six months ended July 1, 2016 (in thousands, except per share amounts): Stock Options Outstanding Restricted Stock Units Outstanding Shares Available for Grant Number of Shares Weighted Average Exercise Price Number of Units Weighted Average Grant Date Fair Value Balance at December 31, 2015 6,150 5,674 $ 6.56 2,182 $ 6.99 Authorized 2,000 — — — — Granted (2,890 ) 886 3.15 1,336 3.14 Options exercised — (1 ) 2.25 — — Shares released — — — (1,054 ) 6.72 Forfeited or cancelled 1,754 (1,375 ) 6.43 (253 ) 5.89 Balance at July 1, 2016 7,014 5,184 $ 6.02 2,211 $ 4.74 The following table summarizes information about stock options outstanding as of July 1, 2016 (in thousands, except per share amounts): Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Vested and expected to vest 4,882 $ 6.07 4.1 $ 98 Exercisable 3,057 6.54 3.0 98 The intrinsic value of options vested and expected to vest and exercisable as of July 1, 2016 is calculated based on the difference between the exercise price and the fair value of the Company’s common stock as of July 1, 2016 . The intrinsic value of options exercised 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 intrinsic value of options exercised during the three and six month periods ended July 3, 2015 was $0.3 million and $1.6 million , respectively. The intrinsic value of options exercised during the three and six month periods ended July 1, 2016 were minimal. The following table summarizes information about RSUs outstanding as of July 1, 2016 (in thousands, except per share amounts): Number of Shares Underlying Restricted Stock Units Weighted Average Remaining Vesting Period (Years) Aggregate Fair Value Vested and expected to vest 1,959 0.9 $ 5,897 The fair value of RSUs vested and expected to vest as of July 1, 2016 is calculated based on the fair value of the Company’s common stock as of July 1, 2016 . Employee Stock Purchase Plan The Company’s stockholders approved an amendment to the 2002 Employee Stock Purchase Plan (the “ESPP”) at the 2016 Annual Meeting which increased the number of shares of common stock reserved for issuance under the ESPP by 1,500,000 shares. As of July 1, 2016 , the number of shares of common stock available for issuance under the “ESPP” was 906,390 . 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. TVN Employee Equity Benefit Plan TVN’s existing employee equity benefit plans consist of the French Employee Incentive plan and the Overseas Long Term Incentive plan. The Company’s acquisition of TVN gave rise to a change-in-control event which causes both plans to become fully vested and the settlement of both plans have to be made in cash according to the agreements. The payment was made in full in the second quarter of 2016 in the amount of approximately $2.9 million upon finalizing the closing adjustments to the TVN purchase price which has an impact on the valuation of the equity value of each plan. TVN Retirement Benefit Plan As part of the TVN acquisition the Company assumed obligations under defined benefit pension plans which were unfunded as of the acquisition date. Under French law, TVN French Subsidiary is required to make certain payments to employees upon their retirement from the Company. These payments are based on the retiring employee’s salary for a number of months that varies according to the employee’s period of service and position. Salary used in the calculation is the employee’s average monthly salary for the twelve months prior to retirement. The payments are made in one lump-sum at the time of retirement. The present value of the company’s obligation for these lump-sum payments is determined on an actuarial basis and the actuarial valuation takes into account the employees’ age and period of service with the company; projected mortality rates, mobility rates and increases in salaries; and a discount rate of 2% per annum. The present value of the Company’s defined benefit pension plan obligations as of July 1, 2016 and changes to the Company’s defined benefit pension plan obligations are shown below (in thousands): July 1, 2016 Projected benefit obligation: Acquired from TVN acquisition $ 5,907 Service cost 94 Interest cost 39 Foreign currency translation adjustment 27 As of July 1, 2016 $ 6,067 Presented on the Condensed Consolidated Balance Sheets under: Current portion (presented under “Accrued liabilities”) $ 243 Long-term portion (presented under “Other non-current liabilities”) $ 5,824 The plan was unfunded as of July 1, 2016 . There were no amounts recognized in accumulated other comprehensive loss as of July 1, 2016 . There are no contributions to the plan required by any laws or funding regulations, discretionary contributions or non-cash contributions expected to be made. Net periodic costs for the three and six months ended July 1, 2016 were $100,000 and $133,000 , respectively. The following assumptions were used in determining the Company’s pension obligation: July 1, 2016 Discount rate 2.0 % Mobility rate 2.2 % Salary progression rate 2.0 % The Company evaluates the discount rate assumption annually. The discount rate used for the Company’s valuation study was based on the rate of long-term Euro zone AA rated 10 years corporate bonds as of December 31, 2015, which yielded 2.0% . The Company also evaluates other assumptions related to demographic factors, such as retirement age, mortality rates and turnover periodically, updating them to reflect experience and expectations for the future. The mortality assumption related to the Company’s defined benefit pension plan used mortality tables published in January 2016 by the French National Institute of Statistics and Economic Studies. Future benefits expected to be paid in each of the next five years, and in the aggregate for the five year period thereafter are as follows (in thousands): Years ending December 31, 2016 (remaining six months) $ 47 2017 117 2018 227 2019 366 2020 433 2021 - 2025 2,311 $ 3,501 401(k) Plan The Company has a retirement/savings plan for the U.S. employees 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. The Company has made 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. The contributions for the six months ended July 1, 2016 and July 3, 2015 were $241,000 and $242,000 , respectively. Stock-based Compensation The following table summarizes stock-based compensation expense for all plans (in thousands): Three months ended Six months ended July 1, July 3, July 1, July 3, Stock-based compensation in: Cost of revenue $ 424 $ 422 $ 651 $ 950 Research and development expense 841 1,027 1,810 2,175 Selling, general and administrative expense 1,503 2,435 3,401 4,893 Total stock-based compensation in operating expense 2,344 3,462 5,211 7,068 Total stock-based compensation $ 2,768 $ 3,884 $ 5,862 $ 8,018 As of July 1, 2016 , the Company had approximately $10.4 million of unrecognized stock-based compensation expense related to the unvested portion of its stock options and RSUs that is expected to be recognized over a weighted-average period of approximately 1.8 years . Valuation Assumptions The Company estimates the fair value of employee stock options and stock purchase rights under the ESPP using a Black-Scholes option valuation model. The value of the stock purchase rights 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. At the date of grant, the Company estimated the fair value of each stock option grant and stock purchase right granted under the ESPP using the following weighted average assumptions: Employee Stock Options Three months ended Six months ended July 1, July 3, July 1, July 3, Expected term (years) 4.30 4.60 4.30 4.70 Volatility 36 % 37 % 36 % 38 % Risk-free interest rate 1.1 % 1.5 % 1.4 % 1.5 % Expected dividends 0.0 % 0.0 % 0.0 % 0.0 % ESPP Purchase Period Ending June 30, June 30, Expected term (years) 0.50 0.50 Volatility 54 % 35 % Risk-free interest rate 0.4 % 0.1 % Expected dividends 0.0 % 0.0 % Estimated weighted average fair value per share at purchase date $1.19 $1.75 The expected term of the employee stock options 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 expected term of the stock purchase rights under the ESPP 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 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 was $1.07 and $2.44 for the three months ended July 1, 2016 and July 3, 2015 , respectively. The weighted-average fair value per share of options granted was $0.97 and $2.63 for the six months ended July 1, 2016 and July 3, 2015 , respectively. The fair value of all stock options vested during the three months ended July 1, 2016 and July 3, 2015 was $0.4 million and $0.6 million , respectively. The fair value of all stock options vested during the six months ended July 1, 2016 and July 3, 2015 was $1.4 million and $1.9 million , respectively. There were no realized tax benefits attributable to stock options exercised in jurisdictions where this expense is deductible for tax purposes for the three and six months ended July 1, 2016 . The total realized tax benefit attributable to stock options exercised during the three and six months ended July 3, 2015 was $120,000 and $22,000 , respectively. The aggregate fair value of all RSUs issued during the three months ended July 1, 2016 and July 3, 2015 was $0.5 million and $1.6 million , respectively. The aggregate fair value of all RSUs issued during the six months ended July 1, 2016 and July 3, 2015 was $7.1 million and $7.6 million , respectively.

Income Taxes

Income Taxes	6 Months Ended
	Jul. 01, 2016
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The Company reported the following operating results for the periods presented (in thousands): Three months ended Six months ended July 1, July 3, July 1, July 3, Loss before income taxes $ (20,437 ) $ (267 ) $ (45,099 ) $ (3,210 ) Provision for income taxes 242 727 760 441 Effective income tax rate (1.2 )% (272.3 )% (1.7 )% (13.7 )% The Company operates in multiple jurisdictions and its profits are taxed pursuant to the tax laws of these jurisdictions. The Company’s 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 Company’s effective tax rate varies from year to year primarily due to the absence of several onetime, discrete items that benefited or decremented the tax rates in the previous years. The Company’s effective income tax rate of (1.7)% for the six months ended July 1, 2016 was different from the U.S. federal statutory rate of 35% , primarily due to favorable tax rates associated with certain earnings from operations in lower-tax jurisdictions, and the tax benefit from the realization of certain deferred tax assets as a result of the TVN acquisition, partially offset by the increase in the valuation allowance against U.S. federal, California and other state deferred tax assets, detriment from non-deductible stock-based compensation, non-deductible amortization of foreign intangibles, and the net of various discrete tax adjustments . For the six months ended July 1, 2016 , the discrete adjustments to the Company's tax expense included primarily the accrual of interest on uncertain tax positions, withholding taxes and a true-up of the tax provision for certain foreign subsidiaries based on the tax returns filed. The Company's effective income tax rate of (13.7)% for the six months ended July 3, 2015 was different from the U.S. federal statutory rate of 35% primarily due to a difference in foreign tax rates. U.S. losses generated for the six months ended July 3, 2015 received no tax benefit as a result of a full valuation allowance against all of the Company’s U.S. deferred tax assets and the impairment of the VJU investment. The Company files U.S. federal and 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 2012 through 2015 tax years generally remain subject to examination by most state tax authorities in the United States. The Company’s income tax return for 2012 is currently under examination by the U.S. Internal Revenue Service, which commenced in August 2015, and the 2013 through 2015 tax years remain subject to examination by the U.S. federal tax authority. In significant foreign jurisdictions, the 2007 through 2015 tax years generally remain subject to examination by their respective tax authorities. A subsidiary of the Company is under audit for the 2012 and 2013 tax years, which commenced in the first quarter of 2015, by the Israel tax authority. If, upon the conclusion of these audits, the ultimate determination of taxes owed in the United States or Israel is for an amount in excess of the tax provision the Company has recorded in the applicable period, the Company’s overall tax expense, effective tax rate, operating results and cash flow could be materially and adversely impacted in the period of adjustment. On July 27, 2015, the U.S. Tax Court issued an opinion in Altera Corp. v. Commissioner , 145 T.C. No. 3 (2015) related to the treatment of stock-based compensation expense in an intercompany cost-sharing arrangement. A final decision was entered by the U.S. Tax Court on December 1, 2015. On February 19, 2016, the U.S. Internal Revenue Service filed a notice of appeal in Altera Corp. v. Commissioner , 145 T.C. No. 3 (2015), to the Ninth Circuit Court of Appeal. The Ninth Circuit will decide whether a regulation that mandates that stock-based compensation costs related to the intangible development activity of a qualified cost sharing arrangement (a “QCSA”) must be included in the joint cost pool of the QCSA (the “all costs rule”) is consistent with the arm’s length standard as set forth in Section 482 of the Internal Revenue Code. The Company concluded that no adjustment to the consolidated financial statements as of December 31, 2015 is appropriate at this time due to the uncertainties with respect to the ultimate resolution of this case. The Company’s operations in Switzerland are 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. As of July 1, 2016 , the total amount of gross unrecognized tax benefits, including interest and penalties, was approximately $16.3 million , of which $4.0 million would affect the Company’s effective tax rate if the benefits are eventually recognized. The remaining gross unrecognized tax benefit does not affect the Company’s effective tax rate as it relates to positions that would be settled with tax attributes such as net operating loss carryforward or tax credits previously subject to a valuation allowance. The Company recognizes interest and penalties related to unrecognized tax positions in income tax expense. The Company had $0.6 million of gross interest and penalties accrued as of July 1, 2016 . The Company will continue to review its tax positions and provide for, or reverse, unrecognized tax benefits as issues arise. As of July 1, 2016 , the Company anticipates that the balance of gross unrecognized tax benefits will remain substantially unchanged over the next 12 months.

Income (Loss) Per Share

Income (Loss) Per Share	6 Months Ended
	Jul. 01, 2016
Earnings Per Share [Abstract]
Income (Loss) Per Share	INCOME (LOSS) PER SHARE The following table sets forth the computation of the basic and diluted net loss per share (in thousands, except per share amounts): Three months ended Six months ended July 1, July 3, July 1, July 3, Numerator: Net loss $ (20,679 ) $ (994 ) $ (45,859 ) $ (3,651 ) Denominator: Weighted average number of common shares outstanding Basic and diluted 77,342 88,426 77,168 88,541 Net loss per share: Basic and diluted $ (0.27 ) $ (0.01 ) $ (0.59 ) $ (0.04 ) The diluted net loss per share is the same as basic net loss per share for the three and six months ended July 1, 2016 and July 3, 2015 because potential common shares are only considered when their effect would be dilutive. The following table sets forth the potential weighted common shares outstanding that were excluded from the computation of basic and diluted net loss per share calculations (in thousands): Three months ended Six months ended July 1, July 3, July 1, July 3, Stock options 5,428 6,840 5,488 6,964 RSUs 2,247 2,462 2,010 2,256 Stock purchase rights under the ESPP 652 449 355 476 Total 8,327 9,751 7,853 9,696 Also excluded from the table above are the Notes, which are convertible under certain conditions into an aggregate of 22,304,348 shares of common stock. (See Note 11, “Convertible Notes, Other Debts and Capital Leases” for additional information on the Notes). Since the Company’s intent is to settle the principal amount of the Notes in cash, the treasury stock method is being used to calculate any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. The conversion spread will have a dilutive impact on diluted net income per share when the Company’s average market price of its common stock for a given period exceeds the conversion price of $5.75 per share.

Segment Information

Segment Information	6 Months Ended
	Jul. 01, 2016
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION 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 Company’s Chief Operating Decision Maker ( the “CODM”), which for Harmonic is its Chief Executive Officer, in deciding how to allocate resources and assess performance. Based on our internal reporting structure, the Company consists of two operating segments: Video and Cable Edge, and prior to the fourth quarter of 2014, the Company operated its business in only one reportable segment. The operating segments were determined based on the nature of the products offered. The Video segment sells video processing and production and playout solutions and services worldwide to broadcast and media companies, streaming new media companies, cable operators, and satellite and telecommunications (telco) Pay-TV service providers. The Cable Edge segment sells cable edge solutions and related services to cable operators globally. The Company does not allocate amortization of intangibles, stock-based compensation, restructuring and related charges, TVN acquisition- and integration-related costs, and certain other non-recurring charges to the operating income for each segment because management does not include this information in the measurement of the performance of the operating segments. A measure of assets by segment is not applicable as segment assets are not included in the discrete financial information provided to the CODM. On February 29, 2016, the Company completed its acquisition of 100% of the outstanding equity of TVN and assigned TVN to its Video operating segment. The following tables provide summary financial information by reportable segment (in thousands): Three months ended Six months ended July 1, 2016 July 3, 2015 July 1, 2016 July 3, 2015 Net revenue: Video $ 90,588 $ 78,207 $ 155,596 $ 147,489 Cable Edge 18,983 24,896 35,807 59,630 Total consolidated net revenue $ 109,571 $ 103,103 $ 191,403 $ 207,119 Operating income (loss): Video $ 518 $ 4,901 $ (6,829 ) $ 4,811 Cable Edge (498 ) 357 (2,351 ) 6,545 Total segment operating income (loss) 20 5,258 (9,180 ) 11,356 Unallocated corporate expenses (1) (9,831 ) (185 ) (15,510 ) (229 ) Stock-based compensation (2,768 ) (3,884 ) (5,862 ) (8,018 ) Amortization of intangibles (5,539 ) (1,532 ) (8,322 ) (3,439 ) Loss from operations (18,118 ) (343 ) (38,874 ) (330 ) Non-operating income (expense) (2,319 ) 76 (6,225 ) (2,880 ) Loss before income taxes $ (20,437 ) $ (267 ) $ (45,099 ) $ (3,210 ) (1) Unallocated corporate expenses include certain corporate-level operating expenses and charges such as restructuring and related charges and excess facilities charges. Additionally, the unallocated corporate expenses in 2016 include TVN acquisition- and integration-related costs (see Note 3, “Business Acquisition” for additional information) and an inventory obsolescence charge of approximately $4.5 million recorded in the second quarter of 2016 for some older Cable Edge product lines in accordance with the Company’s policy for excess and obsolete inventory and also as part of our strategic plan to re-position and dedicate the Company’s primary Cable Edge resources to its new CableOS products.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jul. 01, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Leases Future minimum lease payments under non-cancelable operating leases as of July 1, 2016 are as follows (in thousands): Years ending December 31, 2016 (remaining six months) $ 5,246 2017 12,451 2018 11,768 2019 10,248 2020 7,574 Thereafter 10,428 Total $ 57,715 Warranties 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): Three months ended Six months ended July 1, July 3, July 1, July 3, Balance at beginning of period $ 4,966 $ 4,091 $ 3,913 $ 4,242 Balance assumed from TVN acquisition — — 1,012 — Accrual for current period warranties 1,716 1,530 2,975 3,125 Changes in liability related to pre-existing warranties (74 ) (92 ) (74 ) (92 ) Warranty costs incurred (1,513 ) (1,362 ) (2,731 ) (3,108 ) Balance at end of period $ 5,095 $ 4,167 $ 5,095 $ 4,167 Purchase Commitments with Contract Manufacturers and Other Suppliers 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 defined by the Company. The Company had approximately $22.4 million of non-cancelable purchase commitments with contract manufacturers and other suppliers as of July 1, 2016 . Standby Letters of Credit and Guarantees The Company’s financial guarantees consisted of standby letters of credit and bank guarantees. As of July 1, 2016 , the Company had $0.7 million of standby letters of credit outstanding primarily related to its credit card facility in Switzerland and, to a lesser extent, performance bond and state requirements imposed on employers. In addition, the Company had $1.9 million of bank guarantees outstanding as of July 1, 2016 , of which $1.3 million was related to a building lease for the TVN French Subsidiary, $0.4 million was related to the building leases in Israel, and the remaining amount was mostly related to performance bonds issued to customers of the TVN French Subsidiary. Indemnification Harmonic is obligated to indemnify its officers and the members of its Board of Directors (the “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 these indemnification provisions through July 1, 2016 . Contingencies The TVN acquisition is subject to post-closing adjustments as set forth in the TVN Purchase Agreement to be determined within 90 days from the acquisition date in amounts capped to (i) the difference between €76 million (approximately $83.3 million as converted from euros into U.S. dollars using an agreed upon average exchange rate) and $75 million , with respect to an adjustment based on TVN’s 2015 revenue, and (ii) up to $5 million with respect to an adjustment based on TVN’s 2015 backlog that ships during the first half of 2016. During the second quarter of 2016, the Company paid $3.5 million upon the finalization of the revenue and working capital adjustments. The backlog adjustment has been finalized at $2.5 million and will be paid in the third quarter of 2016. 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 the Company’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 the Company, rejecting Avid’s infringement allegations in their entirety. On May 23, 2014, Avid filed a post-trial motion asking the court to set aside the jury’s verdict, and the judge issued an order on December 17, 2014, denying the motion. On January 5, 2015, Avid filed an appeal with respect to the jury’s verdict with the Federal Circuit, which was docketed on January 9, 2015, as Case No. 2015-1246. Avid filed its opening brief with respect to this appeal on March 24, 2015, the Company filed its response brief on May 7, 2015, and Avid filed its reply brief on June 16, 2015. Oral arguments were held on December 11, 2015. On January 29, 2016, the Federal Circuit issued an order vacating the verdict of noninfringement and remanding the case to the trial court for a new trial on infringement. On February 26, 2016, Harmonic filed a request for rehearing and rehearing en banc at the Federal Circuit. On March 31, 2016, the Federal Circuit denied the request for rehearing and rehearing en banc and a mandate issued on April 8, 2016. A status conference was held with the District Court on April 14, 2016. The court conducted a supplemental claim construction hearing on May 27, 2016 and issued a claim construction order on June 29, 2016. There are currently no deadlines. In June 2012, Avid served a subsequent complaint in the United States District Court for the District of Delaware alleging that the Company’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 (“PTAB”) authorized an inter partes review to be instituted as to claims 1-16 of the patent asserted in this second complaint. A hearing before the PTAB was conducted on May 20, 2014. On July 10, 2014, the PTAB issued a decision finding claims 1-10 invalid and claims 11-16 not invalid. The Company filed an appeal with respect to the PTAB’s decision on claims 11-16 on September 11, 2014. The appeal was docketed with the Federal Circuit on October 22, 2014, as Case No. 2015-1072, and the Company filed its opening brief with respect to this appeal on January 29, 2015. Avid and PTAB each filed a response brief on April 27, 2015, and the Company filed a reply brief on May 28, 2015. Oral arguments were held on October 8, 2015. The Federal Circuit issued an order on March 1, 2016, affirming the PTAB’s decision and a mandate issued on April 7, 2016. On July 25, 2016, the court issued a scheduling order for the case and setting the trial date for November 6, 2017. The Company is unable to predict the outcome of these lawsuits and therefore is unable to estimate an amount or range of any reasonably possible losses resulting from them. An unfavorable outcome on any litigation matter could require that the Company 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 the Company’s business, operating results, financial condition and cash flows.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jul. 01, 2016
Equity [Abstract]
Stockholders' Equity	STOCKHOLDERS’ EQUITY Accumulated Other Comprehensive Income (Loss) (“AOCI”) The components of AOCI, on an after-tax basis where applicable, were as follows (in thousands): Foreign Currency Translation Adjustments Unrealized Gains (Losses) on Cash Flow Hedges Unrealized Gains (Losses) on Available-for-Sale Investments Total Balance as of December 31, 2015 $ (2,634 ) $ (246 ) $ (1,538 ) $ (4,418 ) Other comprehensive income (loss) before reclassifications (677 ) 158 30 (489 ) Amounts reclassified from AOCI — 100 1,476 1,576 Provision for income taxes — — (23 ) (23 ) Balance as of July 1, 2016 $ (3,311 ) $ 12 $ (55 ) $ (3,354 ) The effects of amounts reclassified from AOCI into the Condensed Consolidated Statement of Operations were as follows (in thousands): Three months ended Six months ended July 1, 2016 July 3, 2015 July 1, 2016 July 3, 2015 Gains (losses) on cash flow hedges from foreign currency contracts: Cost of revenue $ (3 ) $ 19 $ (13 ) $ 26 Operating expenses (19 ) 119 (87 ) 161 Total reclassifications from AOCI $ (22 ) $ 138 $ (100 ) $ 187 The loss on available-for-sale securities of $1.5 million reclassified from AOCI into the Condensed Consolidated Statement of Operations was included under “Loss on impairment of long-term investment”. Common Stock Repurchases On April 24, 2012, 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 or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). From time to time, the Board may approve further increases to the program and the amount approved for this program was increased to $300 million periodically through May 2014 and the repurchase period has been extended through the end of 2016. The timing and actual number of shares repurchased, if any, will depend 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 or discontinued at any time without prior notice. There were no stock repurchases in the six months ended July 1, 2016 and the remaining authorized amount for stock repurchases under this program was $45.7 million as of July 1, 2016 . For additional information, see “Item 2 - Unregistered sales of equity securities and use of proceeds” of this Quarterly Report on Form 10-Q.

Basis of Presentation and Sig24

Basis of Presentation and Significant Accounting Policies (Policies)	6 Months Ended
	Jul. 01, 2016
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP 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 financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates.
Business Combinations Policy	Business Combination The Company applies the acquisition method of accounting for business combinations to its acquisition of Thomson Video Networks (“TVN”), which closed on February 29, 2016. (See Note 3, “Business Acquisition” for additional information on TVN acquisition). Under this method of accounting, all assets acquired and liabilities assumed are recorded at their respective fair values at the date of the completion of the transaction. Determining the fair value of assets acquired and liabilities assumed requires management’s judgment and often involves the use of significant estimates and assumptions, including assumptions with respect to future cash inflows and outflows, discount rates, intangibles and other asset lives, among other items. Fair value is defined as the price that would be received in a sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (an exit price). Market participants are assumed to be buyers and sellers in the principal (most advantageous) market for the asset or liability. Additionally, fair value measurements for an asset assume the highest and best use of that asset by market participants. As a result, the Company may have been required to value the acquired assets at fair value measurements that do not reflect its intended use of those assets. Use of different estimates and judgments could yield different results. Any excess of the purchase price over the fair value of the net assets acquired is recognized as goodwill. The accounting for the TVN acquisition is based on currently available information and is considered preliminary. Although the Company believes that the assumptions and estimates it has made are reasonable and appropriate, they are based in part on historical experience and information that may be obtained from the management of the acquired company and are inherently uncertain. Unanticipated events and circumstances may occur that may affect the accuracy or validity of such assumptions, estimates, or actual results. As a result, during the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded in the Company's Condensed Consolidated Statements of Operations.
Significant Accounting Policies	The Company’s significant accounting policies are described in Note 2 to its audited Consolidated Financial Statements included in the 2015 Form 10-K. There have been no significant changes to these policies during the six months ended July 1, 2016 .
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS New standards to be implemented In May 2014, the Financial Accounting Standards Board (“FASB”) issued new authoritative guidance for revenue recognition, requiring an entity to recognize the amount of revenue that reflects the consideration to which it expects to be entitled for the transfer of promised goods or services to customers. The updated standard will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective and permits the use of either the retrospective or cumulative effect transition method. The original effective date for this new standard would have required the Company to adopt it beginning in its first quarter of fiscal 2017. In August 2015, the FASB issued an accounting standard update for the deferral of the effective date by one year to December 15, 2017 for interim and annual reporting periods beginning after that date and permits early adoption, but not before the original effective date of December 15, 2016. Accordingly, the Company may adopt the standard in either its first quarter of fiscal 2017 or fiscal 2018. The new revenue standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. The Company is currently evaluating the timing of its adoption and the impact of this new revenue standard on its consolidated financial statements. In addition, the FASB issued ASU 2016-08, ASU 2016-10, and ASU 2016-12 in March 2016, April 2016, and May 2016, respectively, to help provide interpretive clarifications on the new guidance in ASC Topic 606, Revenue from Contracts with Customers. The Company is in the process of assessing the impact these interpretive clarifications will have upon adoption, including determining the adoption method. In July 2015, the FASB issued an accounting standard update that requires inventory to be measured at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2017 and early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements. In January 2016, the FASB issued an accounting standard update which requires equity investments to be measured at fair value with changes in fair value recognized in net income and simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. The accounting standard update also updates certain presentation and disclosure requirements. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2018 and early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements. In February 2016, the FASB amended the existing accounting standard for lease accounting. Under this guidance, lessees and lessors should apply a “right-of-use” model in accounting for all leases (including subleases) and eliminate the concept of operating leases and off-balance sheet leases. This new accounting standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. The new standard will be effective for the Company beginning in the first quarter of fiscal 2019 and early adoption is permitted. The Company is currently evaluating the methods and impact of adopting this new accounting standard on its consolidated financial statements. In March 2016, the FASB issued an accounting standard update to clarify the requirements for assessing whether contingent call (put) options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. An entity performing the assessment under the amendments is required to assess the embedded call (put) options solely in accordance with the four-step decision sequence. The standard will be effective for the Company beginning in the first quarter of fiscal 2017 and early adoption is permitted. The adoption of this accounting standard update is not expected to have any impact on the financial statements of the Company. In March 2016, the FASB issued an accounting standard update for the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2017 and early adoption is permitted. The Company is currently evaluating the methods and impact of adopting the new accounting standard on its consolidated financial statements. In June 2016, the FASB issued new guidance that changes the impairment model for most financial assets and certain other instruments. For trade receivables and other instruments, the Company will be required to use a new forward-looking “expected loss” model. Additionally, credit losses on available-for-sale debt securities should be recorded through an allowance for credit losses limited to the amount by which fair value is below amortized cost. The new guidance will be effective for the Company beginning in the first quarter of fiscal 2019 and early adoption is permitted. The Company is currently evaluating the impact of adopting this new accounting guidance on its consolidated financial statements. Standards Implemented In April 2015, the FASB issued an accounting standard update that requires debt issuance costs to be presented as a direct deduction from the carrying amount of the related debt liability, consistent with the presentation of debt discounts. Prior to this accounting update, debt issuance costs were required to be presented as deferred charge assets, separate from the related debt liability. This accounting standard update does not change the recognition and measurement requirements for debt issuance costs. The Company early-adopted this accounting standard update as of the end of its fiscal 2015 in connection with the issuance of convertible senior notes in December 2015 (see Note 11, “Convertible Notes, Other Debts and Capital Leases”), resulting in the classification of $3.2 million of unamortized debt issuance costs as a deduction from long-term liability on its Consolidated Balance Sheet at December 31, 2015. Other than this transaction, the adoption of this accounting standard update did not have an impact on the Company’s consolidated financial statements. In April 2015, the FASB issued an accounting standard update on whether a cloud computing arrangement includes a software license. The guidance requires the accounting for a cloud computing arrangement that includes a software license element to be consistent with the accounting for acquisition of other software licenses. Cloud computing arrangement without software licenses are to be accounted for as a service contract. The Company adopted this accounting standard update beginning in the first quarter of fiscal 2016. The adoption of this standard update did not have a material impact on the Company’s consolidated financial statements. In November 2015, the FASB issued an accounting standard update that all deferred tax assets and liabilities, along with any related valuation allowance, be classified as non-current on the balance sheet. The Company prospectively early-adopted this accounting standard update as of the end of its fiscal 2015, resulting in $15.9 million of net deferred tax assets, along with its related valuation allowance, being classified as non-current on its Consolidated Balance Sheet at December 31, 2015. Other than this reclassification, the adoption of this accounting standard update did not have an impact on the Company’s consolidated financial statements. In September 2015, the FASB issued new guidance related to business combinations. The new guidance requires that any adjustments to provisional amounts in a business combination be recorded in the period such adjustments are determined, rather than retrospectively adjusting previously reported amounts. The Company adopted the amendments beginning in the first quarter of fiscal 2016. The adoption did not have a material impact on the Company's consolidated financial statements.
Impairment of Investments	Impairment of Short-term 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 July 1, 2016 . As of July 1, 2016 , 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.
Investments in Other Equity Securities	Each reporting period, the Company reviews all of its unconsolidated VIE investments to determine whether there are any reconsideration events that may result in the Company being a primary beneficiary of any unconsolidated VIE which would then require the Company to consolidate the VIE. The Company also reviews all of its cost-method investments in each reporting period to determine whether a significant event of change in circumstances has occurred that may have an adverse effect on the fair value of each investment.
Derivatives and Hedging Activities	Offsetting of Derivative Assets and Liabilities The Company recognizes all derivative instruments on a gross basis in the Condensed Consolidated Balance Sheets. However, the arrangements with its counterparties allows for net settlement, which are designed to reduce credit risk by permitting net settlement with the same counterparty. The Company uses forward contracts to manage exposures to foreign currency exchange rates. The Company’s primary objective in holding derivative instruments is to reduce the volatility of earnings and cash flows associated with fluctuations in foreign currency exchange rates and the Company does not use derivative instruments for trading purposes. The use of derivative instruments expose the Company to credit risk to the extent that the counterparties may be unable to meet their contractual obligations, as such, the potential risk of loss with any one counterparty is closely monitored by the Company. Derivatives Designated as Hedging Instruments (Cash Flow Hedges) Beginning in December 2014, the Company entered into forward currency contracts to hedge forecasted operating expenses and service costs related to employee salaries and benefits denominated in Israeli shekels (“ILS”) for its subsidiaries in Israel. These ILS forward contracts mature generally within 12 months and are designated as cash flow hedges. For derivatives that are designated as hedges of forecasted foreign currency denominated operating expenses and service costs, the Company assesses effectiveness based on changes in spot currency exchange rates. Changes in spot rates on the derivative are recorded as a component of “Accumulated other comprehensive income (loss)” (“AOCI”) in the Condensed Consolidated Balance Sheets until such time as the hedged transaction impacts earnings. The change in fair value of the forward points, which reflects the interest rate differential between the two countries on the derivative, is excluded from the effectiveness assessment. Gains or losses on the derivative representing either hedge ineffectiveness or hedge components excluded from the assessment of effectiveness are recognized in current earnings. Derivatives Not Designated as Hedging Instruments (Balance Sheet Hedges) Balance sheet hedges consist of foreign currency forward contracts, mature generally within three months, are carried at fair value and they are used to minimize the short-term impact of foreign currency exchange rate fluctuation on cash and certain trade and inter-company receivables and payables. Changes in the fair value of these foreign currency forward contracts are recognized in “Other income (expense), net” in the Condensed Consolidated Statement of Operations and are largely offset by the changes in the fair value of the assets or liabilities being hedged.
Fair Value of Financial Instruments	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. The fair value of the Company’s convertible notes is influenced by interest rates, the Company’s stock price and stock market volatility. The estimated fair value of the Company’s convertible notes based on a market approach was approximately $100.9 million and $123.1 million as of July 1, 2016 and December 31, 2015, respectively, and represents a Level 2 valuation. The Company’s other debts and capital leases assumed from the TVN acquisition are classified within Level 2 because these borrowings are not actively traded and the majority of them have a variable interest rate structure based upon market rates currently available to the Company for debt with similar terms and maturities. Additionally, the Company considers the carrying amount of its capital lease obligations to approximate their fair value because the weighted average interest rate used to formulate the carrying amounts approximates current market rates. The other debts and capital leases outstanding as of July 1, 2016 were $24.0 million in the aggregate. (See Note 11, “Convertible Notes, Other debts and Capital Leases” for additional information). The Company’s liabilities for the TVN contingent consideration under the TVN Purchase Agreement as of July 1, 2016 is classified within Level 3 because these valuations are based on management assumptions, including discount rates and estimated probabilities of achievement of certain events which are unobservable in the market. The Company’s liability for TVN contingent consideration was $2.5 million and $8.0 million , respectively, as of July 1, 2016 and April 1, 2016. The $5.5 million reduction in the second quarter of 2016 was primarily due to a $3.5 million partial settlement and a $2.0 million adjustment upon finalizing the pending post-closing adjustments. The liabilities for the assumed TVN employee equity plans of approximately $2.9 million were fully paid in the second quarter of 2016 and there were no other outstanding amounts under these plans at July 1, 2016. During the six months ended July 1, 2016 , there were no nonrecurring fair value measurements of assets and liabilities subsequent to initial recognition.
Goodwill and Intangible Assets, Goodwill	A significant decline in a company’s stock price may suggest that an adverse change in the business climate may have caused the fair value of one or more reporting units to fall below their carrying value. During the second quarter of 2016, the sustained decline in the Company’s stock price led to a triggering event for goodwill impairment assessment. As of July 1, 2016, with a closing stock price of $3.01 on the NASDAQ stock exchange, the Company’s market capitalization was approximately $235 million . As this market capitalization was less than the Company’s net book value, further analysis was performed to determine if an impairment exists. When assessing goodwill for impairment, the Company used multiple valuation methodologies to determine its enterprise value. The valuation methods used included the Company’s market capitalization adjusted for a control premium and the Company’s discounted cash flow analysis, which involves making significant assumptions and estimates, including expectations of the Company’s future financial performance, the Company’s weighted average cost of capital and the Company’s interpretation of currently enacted tax laws. Based on the impairment test performed, management determined that the Company’s goodwill was not impaired as of July 1, 2016. The Company believes that the fluctuation in market capitalization is driven by general market movement and not Company specific factors. The Company has not recorded any impairment charges related to goodwill for any prior periods.
Restructuring and Related Charges	The Company accounts for facility exit costs in accordance with ASC 420, “Exit or Disposal Cost Obligations”, which requires that a liability for such costs be recognized and measured initially at fair value on the cease-use date based on remaining lease rentals, adjusted for the effects of any prepaid or deferred items recognized, reduced by the estimated sublease rentals that could be reasonably obtained even if it is not the intent to sublease. The fair value of these liabilities is based on a net present value model using a credit-adjusted risk-free rate. The liability will be paid out over the remainder of the leased properties’ terms, which continue through August 2020. Actual sublease terms may differ from the estimates originally made by the Company. Any future changes in the estimates or in the actual sublease income could require future adjustments to the liabilities, which would impact net income in the period the adjustment is recorded.
Share-based Compensation Expense	The Company estimates the fair value of employee stock options and stock purchase rights under the ESPP using a Black-Scholes option valuation model. The value of the stock purchase rights 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. The expected term of the employee stock options 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 expected term of the stock purchase rights under the ESPP 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 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 Tax	As of July 1, 2016 , the total amount of gross unrecognized tax benefits, including interest and penalties, was approximately $16.3 million , of which $4.0 million would affect the Company’s effective tax rate if the benefits are eventually recognized. The remaining gross unrecognized tax benefit does not affect the Company’s effective tax rate as it relates to positions that would be settled with tax attributes such as net operating loss carryforward or tax credits previously subject to a valuation allowance. The Company recognizes interest and penalties related to unrecognized tax positions in income tax expense. The Company had $0.6 million of gross interest and penalties accrued as of July 1, 2016 . The Company will continue to review its tax positions and provide for, or reverse, unrecognized tax benefits as issues arise. As of July 1, 2016 , the Company anticipates that the balance of gross unrecognized tax benefits will remain substantially unchanged over the next 12 months.
Segment Information	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 Company’s Chief Operating Decision Maker ( the “CODM”), which for Harmonic is its Chief Executive Officer, in deciding how to allocate resources and assess performance. Based on our internal reporting structure, the Company consists of two operating segments: Video and Cable Edge, and prior to the fourth quarter of 2014, the Company operated its business in only one reportable segment. The operating segments were determined based on the nature of the products offered. The Video segment sells video processing and production and playout solutions and services worldwide to broadcast and media companies, streaming new media companies, cable operators, and satellite and telecommunications (telco) Pay-TV service providers. The Cable Edge segment sells cable edge solutions and related services to cable operators globally. The Company does not allocate amortization of intangibles, stock-based compensation, restructuring and related charges, TVN acquisition- and integration-related costs, and certain other non-recurring charges to the operating income for each segment because management does not include this information in the measurement of the performance of the operating segments. A measure of assets by segment is not applicable as segment assets are not included in the discrete financial information provided to the CODM.
Warranties and Indemnification	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. Harmonic is obligated to indemnify its officers and the members of its Board of Directors (the “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).

Business Acquisitions (Tables)

Business Acquisitions (Tables)	6 Months Ended
	Jul. 01, 2016
Business Acquisition, Pro Forma Information [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The Company’s preliminary allocation of the estimated purchase consideration as of July 1, 2016 was as follows (in thousands): Assets: Cash and cash equivalents $ 7,063 Accounts receivable, net 14,923 Inventories 3,462 Prepaid expenses and other current assets 4,442 Property and equipment, net 9,988 French R&D tax credit receivables (1) 26,421 Other long-term assets 1,824 Total assets $ 68,123 Liabilities: Other debts and capital leases, current 8,362 Accounts payable 13,963 Deferred revenue 2,504 Accrued liabilities 18,524 Other debts and capital leases, long-term 16,087 Other long-term liabilities 6,415 Deferred tax liabilities 952 Total liabilities $ 66,807 Goodwill 37,630 Intangibles 43,600 Total purchase consideration $ 82,546 (1) See Note 8, “Balance Sheet Components-Prepaid expenses and other current assets” for more information on French R&D tax credit receivables”.
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination	The following table presents details of the intangible assets acquired through this business combination (in thousands, except years): Estimated Useful Life (in years) Fair Value Backlog 6 months $ 3,600 Developed technology 4 years 21,400 Customer relationships 5 years 18,000 In-process research and development (1) N/A — Trade name 4 years 600 $ 43,600
Business Combination Acquisition And Integration Cost	Acquisition-and integration-related expenses for the TVN acquisition is summarized in the table below (in thousands): Acquisition-related Integration-related Three months ended Six months ended Three months ended Six months ended July 1, 2016 July 1, 2016 Product cost of revenue $ — $ — $ 433 $ 491 Research and development — — 500 550 Selling, general and administrative 885 3,321 1,585 2,137 Total acquisition- and integration-related expenses in operating expenses 885 3,321 2,085 2,687 Total acquisition- and integration-related expenses $ 885 $ 3,321 $ 2,518 $ 3,178
Business Acquisition, Pro Forma Information	The following unaudited pro forma summary presents consolidated information of the Company as if the acquisition of TVN had occurred on January 1, 2015, the beginning of the comparable prior annual period. The unaudited pro forma combined results are provided for illustrative purpose only and are not indicative of the Company’s actual consolidation results. The pro forma adjustments primarily relate to the amortization of acquired intangibles and interest expense related to financing arrangements. In addition, the unaudited pro forma net loss for the three and six months ended July 3, 2015 was adjusted to include $3.4 million and $6.5 million of acquisition- and integration- related expenses, respectively; and $5.7 million and $8.1 million reduction in revenue related to the fair value adjustment of deferred revenue. The unaudited pro forma net loss for the six months ended July 1, 2016 was adjusted to exclude $6.5 million of acquisition- and integration- related expenses. These adjustments exclude the income tax impact. Three months ended Six months ended July 3, July 1, July 3, (in millions, except per share amounts) Net revenue $ 127.3 $ 200.1 $ 243.9 Net loss (8.9 ) (40.3 ) (27.9 ) Net loss per share-basic and diluted $ (0.10 ) $ (0.52 ) $ (0.31 )

Short-Term Investments (Tables)

Short-Term Investments (Tables)	6 Months Ended
	Jul. 01, 2016
Cash and Cash Equivalents [Abstract]
Summary of Short-Term Investments	The following table summarizes the Company’s short-term investments (in thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of July 1, 2016 Corporate bonds $ 13,752 $ 9 $ (1 ) $ 13,760 Total short-term investments $ 13,752 $ 9 $ (1 ) $ 13,760 As of December 31, 2015 Corporate bonds $ 25,557 $ — $ (52 ) $ 25,505 Commercial paper 1,099 — — 1,099 Total short-term investments $ 26,656 $ — $ (52 ) $ 26,604
Maturities of Short-Term Investments	The following table summarizes the maturities of the Company’s short-term investments (in thousands): July 1, 2016 December 31, 2015 Less than one year $ 12,424 $ 19,642 Due in 1 - 2 years 1,336 6,962 Total short-term investments $ 13,760 $ 26,604

Schedule of Cost Method Investm

Schedule of Cost Method Investments (Tables)	6 Months Ended
	Jul. 01, 2016
Investments, All Other Investments [Abstract]
Cost Method Investments	The following table presents the carrying values and maximum exposure of the unconsolidated VIEs as of July 1, 2016 (in thousands): Carrying Value Maximum exposure to loss (1) VJU $ — $ — EDC (2) 3,593 3,593 Total $ 3,593 $ 3,593

Derivative and Hedging Activiti

Derivative and Hedging Activities (Tables)	6 Months Ended
	Jul. 01, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments gain and losses by Statement of Operations locations	The locations and amounts of designated and non-designated derivative instruments’ gains and losses reported in the Company’s Accumulated Other Comprehensive Income (Loss) and Condensed Consolidated Statements of Operations were as follows (in thousands): Three months ended Six months ended Financial Statement Location July 1, 2016 July 3, 2015 July 1, 2016 July 3, 2015 Derivatives designated as hedging instruments: Gains (losses) in AOCI on derivatives (effective portion) AOCI $ (165 ) $ 516 $ 158 $ 332 Gains (losses) reclassified from AOCI into income (effective portion) Cost of Revenue $ (3 ) $ 19 $ (13 ) $ 26 Operating Expense (19 ) 119 (87 ) 161 Total $ (22 ) $ 138 $ (100 ) $ 187 Losses recognized in income on derivatives (ineffectiveness portion and amount excluded from effectiveness testing) Other income (expense), net $ (22 ) $ (10 ) $ (49 ) $ (52 ) Derivatives not designated as hedging instruments: Gains (losses) recognized in income Other income (expense), net $ (50 ) $ 133 $ (334 ) $ 385
Schedule of Notional Amounts of Outstanding Derivative Positions	The U.S. dollar equivalents of all outstanding notional amounts of foreign currency forward contracts are summarized as follows (in thousands): July 1, 2016 December 31, 2015 Derivatives designated as cash flow hedges: Purchase $ 6,001 $ 12,984 Derivatives not designated as hedging instruments: Purchase $ 4,048 $ 6,942 Sell $ 14,854 $ 11,332
Schedule of Derivatives Instruments Balance Sheet Location	The locations and fair value amounts of the Company’s derivative instruments reported in its Condensed Consolidated Balance Sheets are as follows (in thousands): Asset Derivatives Derivative Liabilities Balance Sheet Location July 1, 2016 December 31, 2015 Balance Sheet Location July 1, 2016 December 31, 2015 Derivatives designated as hedging instruments: Foreign currency contracts Prepaid expenses and other current assets $ 23 $ 13 Accrued Liabilities $ 51 $ 281 $ 23 $ 13 $ 51 $ 281 Derivatives not designated as hedging instruments: Foreign currency contracts Prepaid expenses and other current assets $ 36 $ 100 Accrued Liabilities $ 74 $ 90 $ 36 $ 100 $ 74 $ 90 Total derivatives $ 59 $ 113 $ 125 $ 371
Changes in fair values of non-designated foreign currency forward contracts	As of July 1, 2016 , information related to the offsetting arrangements was as follows (in thousands): Gross Amounts of Derivatives Not Offset in the Condensed Consolidated Balance Sheets Gross Amounts of Derivatives Gross Amounts of Derivatives Offset in the Condensed Consolidated Balance Sheets Net Amounts of Derivatives Presented in the Condensed Consolidated Balance Sheets Financial Instrument Cash Collateral Pledged Net Amount Derivative Assets $ 59 — $ 59 $ (36 ) — $ 23 Derivative Liabilities $ 125 — $ 125 $ (36 ) — $ 89

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jul. 01, 2016
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 on a recurring basis based on the three-tier fair value hierarchy (in thousands): Level 1 Level 2 Level 3 Total As of July 1, 2016 Cash equivalents Money market funds $ 8,433 $ — $ — $ 8,433 Short-term investments Corporate bonds — 13,760 — 13,760 Prepaids and other current assets Time deposit pledged for credit card facility — 580 — 580 Derivative assets — 59 — 59 Other assets Long-term investment 1,810 — — 1,810 Total assets measured and recorded at fair value $ 10,243 $ 14,399 $ — $ 24,642 Accrued liabilities Derivative liabilities — 125 — 125 Total liabilities measured and recorded at fair value $ — $ 125 $ — $ 125 Level 1 Level 2 Level 3 Total As of December 31, 2015 Cash equivalents Money market funds $ 53,434 $ — $ — $ 53,434 U.S. Treasury bills 24,998 — — 24,998 Short-term investments Corporate bonds — 25,505 — 25,505 Commercial paper — 1,099 — 1,099 Prepaids and other current assets Time deposit pledged for credit card facility — 580 — 580 Derivative assets — 113 — 113 Other assets Long-term investment 1,840 — — 1,840 Total assets measured and recorded at fair value $ 80,272 $ 27,297 $ — $ 107,569 Accrued liabilities Derivative liabilities $ — $ 371 $ — $ 371 Total liabilities measured and recorded at fair value $ — $ 371 $ — $ 371

Balance Sheet Components (Table

Balance Sheet Components (Tables)	6 Months Ended
	Jul. 01, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts Receivable, Net	July 1, 2016 December 31, 2015 Accounts receivable, net: Accounts receivable $ 107,558 $ 73,855 Less: allowances for doubtful accounts, returns and discounts (4,890 ) (4,340 ) Total $ 102,668 $ 69,515
Prepaid, and Other Current Assets	July 1, 2016 December 31, 2015 Prepaid expenses and other current assets: Prepaid inventories to contract manufacturer (1) $ 8,500 $ 8,500 Prepaid maintenance, royalty, rent and property taxes 6,530 5,974 Other Prepayments 7,242 2,762 Deferred cost of revenue 10,353 4,601 French R&D tax credits receivable (2) 6,203 — Restricted cash (3) 1,328 1,093 Other 3,161 2,073 Total $ 43,317 $ 25,003 (1) From time to time, the Company makes advance payment to a supplier for future inventory in order to secure more favorable pricing. The Company anticipates that this amount will be offset in the first quarter of 2017 against the accounts payable owed to this supplier. (2) The Company’s acquired TVN subsidiary in France (the “TVN French Subsidiary”) participates in the French Crédit d’Impôt Recherche (“CIR”) program (the “R&D tax credits”) which allows companies to monetize eligible research expenses. The French R&D tax credits can be used to offset against income tax payable to the French government in each of the four years after being incurred, or if not utilized, are recoverable in cash. The amount of French R&D tax credits recoverable are subject to audit by the French government and during the second quarter of 2016, the French government approved the 2012 claim and refunded $5.8 million to the TVN French Subsidiary. The remaining R&D tax credit receivables at July 1, 2016 were approximately $23.1 million and are expected to be recoverable from 2017 through 2020 with $6.2 million reported under “Prepaid and other Current Assets” and $16.9 million reported under “Other Long-term Assets” on the Company’s Condensed Consolidated Balance Sheets. Pursuant to the TVN Purchase Agreement, the Company is indemnified by the selling shareholders with respect to the validity and recoverability of the outstanding TVN French Subsidiary R&D tax credit receivables. (3) The restricted cash balances are primarily held as cash collateral security for certain bank guarantees. These restricted funds are invested in bank deposits and cannot be withdrawn from the Company’s accounts without the prior written consent of the applicable secured party. Additionally, as of July 1, 2016, the Company recorded approximately $1.1 million of restricted cash for the bank guarantee associated with the TVN French Subsidiary’s office building lease. This amount is reported under “Other Long-term Assets” on the Company’s Condensed Consolidated Balance Sheets.
Inventories	July 1, 2016 December 31, 2015 Inventories: Raw materials $ 7,824 $ 5,421 Work-in-process 1,186 1,950 Finished goods 15,640 19,827 Service-related spares 11,974 11,621 Total $ 36,624 $ 38,819
Property and Equipment, Net	July 1, 2016 December 31, 2015 Property and equipment, net: Furniture and fixtures $ 9,026 $ 7,808 Machinery and equipment 96,257 93,010 Capitalized software 34,428 29,391 Leasehold improvements 13,891 10,000 Property and equipment, gross 153,602 140,209 Less: accumulated depreciation and amortization (117,085 ) (113,197 ) Total $ 36,517 $ 27,012
Accrued Liabilities	July 1, 2016 December 31, 2015 Accrued Liabilities: Accrued employee compensation and related expenses $ 18,379 $ 12,083 Accrued sales and use tax and property taxes 3,540 1,743 Accrued TVN contingent consideration (1) 2,483 — Accrued warranty 5,095 3,913 Accrued royalty payments 2,487 873 Contingent inventory reserves 3,649 1,315 Customer deposits and accrued customer rebates 4,319 1,851 Others 12,394 9,576 Total $ 52,346 $ 31,354 (1) The TVN acquisition is subject to post-closing adjustments as set forth in the TVN Purchase Agreement to be determined within 90 days from the acquisition date in amounts capped to (i) the difference between €76 million (approximately $83.3 million as converted from euros into U.S. dollars using an agreed upon average exchange rate) and $75 million , with respect to an adjustment based on TVN’s 2015 revenue, and (ii) up to $5 million with respect to an adjustment based on TVN’s 2015 backlog that ships during the first half of 2016. During the second quarter of 2016, the Company paid $3.5 million upon the finalization of the revenue and working capital adjustments. The remaining backlog adjustment amount has been finalized at $2.5 million and will be paid in the third quarter of 2016.

Goodwill and Identified Intan31

Goodwill and Identified Intangible Assets (Tables)	6 Months Ended
	Jul. 01, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill	The following table presents goodwill by reportable segments (in thousands): Video Cable Edge Total As of December 31, 2015 $ 136,904 $ 60,877 $ 197,781 Preliminary estimate of goodwill from TVN acquisition 37,630 — 37,630 Foreign currency translation adjustment 26 (68 ) (42 ) As of July 1, 2016 $ 174,560 $ 60,809 $ 235,369
Summary of Goodwill and Identified Intangible Assets	The following is a summary of intangible assets (in thousands): July 1, 2016 December 31, 2015 Weighted Average Remaining Life (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed core technology 3.7 $ 32,489 $ (12,695 ) $ 19,794 $ 10,987 $ (10,987 ) $ — Customer relationships/contracts 4.4 47,286 (29,392 ) 17,894 29,200 (25,752 ) 3,448 Trademarks and trade names 3.7 603 (50 ) 553 — — — Maintenance agreements and related relationships 0.2 5,500 (5,309 ) 191 5,500 (4,851 ) 649 Order Backlog 0.2 3,617 (2,411 ) 1,206 — — — Total identifiable intangibles $ 89,495 $ (49,857 ) $ 39,638 $ 45,687 $ (41,590 ) $ 4,097
Amortization Expense for Identifiable Purchased Intangible Assets	Amortization expense for the identifiable purchased intangible assets for the three and six months ended July 1, 2016 and July 3, 2015 was allocated as follows (in thousands): Three months ended Six months ended July 1, July 3, July 1, July 3, Included in cost of revenue $ 1,307 $ 86 $ 1,725 $ 547 Included in operating expenses 4,232 1,446 6,597 2,892 Total amortization expense $ 5,539 $ 1,532 $ 8,322 $ 3,439
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 Revenue Operating Expenses Total Year ended December 31, 2016 (remaining six months) $ 2,688 $ 4,295 $ 6,983 2017 5,376 3,768 9,144 2018 5,376 3,768 9,144 2019 5,376 3,768 9,144 2020 978 3,642 4,620 Thereafter — 603 603 Total future amortization expense $ 19,794 $ 19,844 $ 39,638

Restructuring and Related Cha32

Restructuring and Related Charges (Tables)	6 Months Ended
	Jul. 01, 2016
Restructuring Cost and Reserve [Line Items]
Summary of restructuring activities	The following table summarizes the restructuring and asset impairment charges (in thousands): Three months ended Six months ended July 1, July 3, July 1, July 3, Restructuring and asset impairment charges in: Product cost of revenue $ 6 $ — $ (23 ) $ — Operating expenses-Restructuring and related charges 1,903 185 4,515 229 Total restructuring and related charges $ 1,909 $ 185 $ 4,492 $ 229
Harmonic 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Schedule of Restructuring Reserve by Type of Cost	The following table summarizes the activity in the Company’s restructuring accrual related to the Harmonic 2016 Restructuring Plan during the six months ended July 1, 2016 (in thousands): Excess facilities Severance and benefits (1) Other charges Total Charges for 2016 Harmonic Restructuring Plan $ 1,418 $ 2,893 $ 246 $ 4,557 Reclassification of deferred rent 1,087 — — 1,087 Cash payments (468 ) (1,331 ) — (1,799 ) Non-cash write-offs — — (246 ) (246 ) Foreign exchange gain (loss) — (5 ) — (5 ) Balance at July 1, 2016 $ 2,037 $ 1,557 $ — $ 3,594 (1) The Company anticipates that the remaining severance and benefits accrual at July 1, 2016 will be substantially paid out by the end of 2016.
Harmonic Two Thousand And Fifteen Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Schedule of Restructuring Reserve by Type of Cost	The following table summarizes the activity in the Company’s restructuring accrual related to the Harmonic 2015 Restructuring Plan during the six months ended July 1, 2016 (in thousands): Severance and benefits (2) Balance at December 31, 2015 $ 264 Adjustments to restructuring provisions (65 ) Cash payments (194 ) Balance at July 1, 2016 $ 5

Convertible Notes, Other Debt33

Convertible Notes, Other Debts And Capital Leases (Tables)	6 Months Ended
	Jul. 01, 2016
Debt Disclosure [Abstract]
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	The following table presents the components of the Notes as of July 1, 2016 and December 31, 2015 (in thousands, except for years and percentages): July 1, 2016 December 31, 2015 Liability: Principal amount $ 128,250 $ 128,250 Less: Debt discount, net of amortization (24,575 ) (26,732 ) Less: Debt issuance costs, net of amortization (2,963 ) (3,223 ) Carrying amount $ 100,712 $ 98,295 Remaining amortization period (years) 4.4 4.9 Effective interest rate on liability component 9.94 % 9.94 % Equity: Value of conversion option $ 26,925 $ 26,925 Less: Equity issuance costs (863 ) (863 ) Carrying amount $ 26,062 $ 26,062
Convertible Debt Interest	The following table presents interest expense recognized for the Notes (in thousands): Three months ended Six months ended July 1, 2016 July 3, 2015 July 1, 2016 July 3, 2015 Contractual interest expense $ 1,282 $ — $ 2,565 $ — Amortization of debt discount 1,098 — 2,157 — Amortization of debt issuance costs 132 — 260 — Total interest expense recognized $ 2,512 $ — $ 4,982 $ —
Schedule of Other Debt and Capital Leases	In connection with the TVN acquisition, the Company assumed a variety of debt and credit facilities in France to satisfy the financing requirements of TVN operations. These arrangements are summarized in the table below (in thousands): July 1, 2016 Financing from French government agencies related to various government incentive programs (1) $ 18,977 Term loans (2) 1,616 Secured borrowings (3) 1,100 Obligations under capital leases 2,326 Total debt obligations 24,019 Less: current portion (7,829 ) Long-term portion $ 16,190 Other than the 4.00% Notes, the Company did not have any other indebtedness as of December 31, 2015. (1) As of July 1, 2016 , the Company’s TVN French Subsidiary had an aggregate of $19.0 million of loans due to various financing programs of French government agencies, $15.4 million of which is related to loans backed by French R&D tax credit receivables. As of July 1, 2016 , the TVN French Subsidiary had an aggregate of $23.1 million of R&D tax credit receivables from the French government from 2017 through 2020. (See Note 8, “Balance Sheet Components-Prepaid expenses and other current assets” for more information). The R&D tax loans have a fixed rate of 0.6% , plus EURIBOR 1 month + 1.3% and matures between 2017 through 2019. The remaining loans of $3.6 million at July 1, 2016 primarily relates to financial support from French government agencies for R&D innovation projects at minimal interest rates and these loans mature between 2020 through 2023. (2) One of the term loans with a certain financial institution contains annual covenants that require the TVN French Subsidiary to maintain a minimum working capital balance and various other financial covenants and restrictions that limit the French Subsidiary’s ability to incur additional indebtedness. The annual covenant is based on French statutory year-end results and the French subsidiary was in compliance for 2015. (3) The TVN French Subsidiary obtained advances under a credit line with BPI France against a pool of eligible receivables with recourse. The maximum advance under this credit line for receivables is €2 million (approximately $2.2 million as converted using the exchange rate at July 1, 2016), less applicable fees, and €200,000 (approximately $0.2 million as converted using the exchange rate at July 1, 2016) of cash is pledged for this program. This credit line was renewed in July 2016 for an additional year with no material change to the terms of the credit agreement. The TVN French Subsidiary also entered into an accounts receivable financing agreement with GE Capital Cofacredit, (“GE”) on September 27, 2013, which is subject to automatic renewal unless cancelled. GE advances up to 90% of qualified customer invoices and holds the remaining 10% as a guarantee fund up with a minimum of €80,000 (approximately $0.1 million as converted using the exchange rate at July 1, 2016). In addition, another 10% of outstanding receivables is set aside in a holdback receivable and released upon payments received from the customers. These arrangements are treated as secured borrowings in accordance with FASB ASC 860, Transfers and Servicing .
Schedule of Maturities of Long-term Debt	The table below shows the future minimum repayments of debts and capital lease obligations as of July 1, 2016 (in thousands): Years ending December 31, Capital lease obligations Debt obligations 2016 (remaining six months) $ 590 $ 1,354 2017 1,116 5,622 2018 527 5,779 2019 67 6,662 2020 26 665 Thereafter — 1,611 Total $ 2,326 $ 21,693

Employee Benefit Plans and St34

Employee Benefit Plans and Stock-based Compensation (Tables)	6 Months Ended
	Jul. 01, 2016
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 RSU activities during the six months ended July 1, 2016 (in thousands, except per share amounts): Stock Options Outstanding Restricted Stock Units Outstanding Shares Available for Grant Number of Shares Weighted Average Exercise Price Number of Units Weighted Average Grant Date Fair Value Balance at December 31, 2015 6,150 5,674 $ 6.56 2,182 $ 6.99 Authorized 2,000 — — — — Granted (2,890 ) 886 3.15 1,336 3.14 Options exercised — (1 ) 2.25 — — Shares released — — — (1,054 ) 6.72 Forfeited or cancelled 1,754 (1,375 ) 6.43 (253 ) 5.89 Balance at July 1, 2016 7,014 5,184 $ 6.02 2,211 $ 4.74
Summary of Stock Options Outstanding	The following table summarizes information about stock options outstanding as of July 1, 2016 (in thousands, except per share amounts): Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Vested and expected to vest 4,882 $ 6.07 4.1 $ 98 Exercisable 3,057 6.54 3.0 98
Summary of Restricted Stock Units Outstanding	The following table summarizes information about RSUs outstanding as of July 1, 2016 (in thousands, except per share amounts): Number of Shares Underlying Restricted Stock Units Weighted Average Remaining Vesting Period (Years) Aggregate Fair Value Vested and expected to vest 1,959 0.9 $ 5,897
Schedule of Defined Benefit Plans Obligations	hanges to the Company’s defined benefit pension plan obligations are shown below (in thousands): July 1, 2016 Projected benefit obligation: Acquired from TVN acquisition $ 5,907 Service cost 94 Interest cost 39 Foreign currency translation adjustment 27 As of July 1, 2016 $ 6,067 Presented on the Condensed Consolidated Balance Sheets under: Current portion (presented under “Accrued liabilities”) $ 243 Long-term portion (presented under “Other non-current liabilities”) $ 5,824
Schedule of Assumptions Used - Employee Benefit Plans Obligation	The following assumptions were used in determining the Company’s pension obligation: July 1, 2016 Discount rate 2.0 % Mobility rate 2.2 % Salary progression rate 2.0 %
Schedule of Expected Benefit Payments	Future benefits expected to be paid in each of the next five years, and in the aggregate for the five year period thereafter are as follows (in thousands): Years ending December 31, 2016 (remaining six months) $ 47 2017 117 2018 227 2019 366 2020 433 2021 - 2025 2,311 $ 3,501
Summary of Stock-Based Compensation Expense	Stock-based Compensation The following table summarizes stock-based compensation expense for all plans (in thousands): Three months ended Six months ended July 1, July 3, July 1, July 3, Stock-based compensation in: Cost of revenue $ 424 $ 422 $ 651 $ 950 Research and development expense 841 1,027 1,810 2,175 Selling, general and administrative expense 1,503 2,435 3,401 4,893 Total stock-based compensation in operating expense 2,344 3,462 5,211 7,068 Total stock-based compensation $ 2,768 $ 3,884 $ 5,862 $ 8,018
Valuation Assumptions for Stock Options	Employee Stock Options Three months ended Six months ended July 1, July 3, July 1, July 3, Expected term (years) 4.30 4.60 4.30 4.70 Volatility 36 % 37 % 36 % 38 % Risk-free interest rate 1.1 % 1.5 % 1.4 % 1.5 % Expected dividends 0.0 % 0.0 % 0.0 % 0.0 %
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions	ESPP Purchase Period Ending June 30, June 30, Expected term (years) 0.50 0.50 Volatility 54 % 35 % Risk-free interest rate 0.4 % 0.1 % Expected dividends 0.0 % 0.0 % Estimated weighted average fair value per share at purchase date $1.19 $1.75

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jul. 01, 2016
Income Tax Disclosure [Abstract]
Schedule of income before income tax	The Company reported the following operating results for the periods presented (in thousands): Three months ended Six months ended July 1, July 3, July 1, July 3, Loss before income taxes $ (20,437 ) $ (267 ) $ (45,099 ) $ (3,210 ) Provision for income taxes 242 727 760 441 Effective income tax rate (1.2 )% (272.3 )% (1.7 )% (13.7 )%

Income (Loss) Per Share (Tables

Income (Loss) Per Share (Tables)	6 Months Ended
	Jul. 01, 2016
Earnings Per Share [Abstract]
Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations	The following table sets forth the computation of the basic and diluted net loss per share (in thousands, except per share amounts): Three months ended Six months ended July 1, July 3, July 1, July 3, Numerator: Net loss $ (20,679 ) $ (994 ) $ (45,859 ) $ (3,651 ) Denominator: Weighted average number of common shares outstanding Basic and diluted 77,342 88,426 77,168 88,541 Net loss per share: Basic and diluted $ (0.27 ) $ (0.01 ) $ (0.59 ) $ (0.04 )
Anti-dilutive Securities	The following table sets forth the potential weighted common shares outstanding that were excluded from the computation of basic and diluted net loss per share calculations (in thousands): Three months ended Six months ended July 1, July 3, July 1, July 3, Stock options 5,428 6,840 5,488 6,964 RSUs 2,247 2,462 2,010 2,256 Stock purchase rights under the ESPP 652 449 355 476 Total 8,327 9,751 7,853 9,696

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jul. 01, 2016
Segment Reporting [Abstract]
Segment Reporting Information, by Segment	The following tables provide summary financial information by reportable segment (in thousands): Three months ended Six months ended July 1, 2016 July 3, 2015 July 1, 2016 July 3, 2015 Net revenue: Video $ 90,588 $ 78,207 $ 155,596 $ 147,489 Cable Edge 18,983 24,896 35,807 59,630 Total consolidated net revenue $ 109,571 $ 103,103 $ 191,403 $ 207,119 Operating income (loss): Video $ 518 $ 4,901 $ (6,829 ) $ 4,811 Cable Edge (498 ) 357 (2,351 ) 6,545 Total segment operating income (loss) 20 5,258 (9,180 ) 11,356 Unallocated corporate expenses (1) (9,831 ) (185 ) (15,510 ) (229 ) Stock-based compensation (2,768 ) (3,884 ) (5,862 ) (8,018 ) Amortization of intangibles (5,539 ) (1,532 ) (8,322 ) (3,439 ) Loss from operations (18,118 ) (343 ) (38,874 ) (330 ) Non-operating income (expense) (2,319 ) 76 (6,225 ) (2,880 ) Loss before income taxes $ (20,437 ) $ (267 ) $ (45,099 ) $ (3,210 ) (1) Unallocated corporate expenses include certain corporate-level operating expenses and charges such as restructuring and related charges and excess facilities charges. Additionally, the unallocated corporate expenses in 2016 include TVN acquisition- and integration-related costs (see Note 3, “Business Acquisition” for additional information) and an inventory obsolescence charge of approximately $4.5 million recorded in the second quarter of 2016 for some older Cable Edge product lines in accordance with the Company’s policy for excess and obsolete inventory and also as part of our strategic plan to re-position and dedicate the Company’s primary Cable Edge resources to its new CableOS products.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jul. 01, 2016
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Lease Payments Under Non-cancelable Operating Leases	Future minimum lease payments under non-cancelable operating leases as of July 1, 2016 are as follows (in thousands): Years ending December 31, 2016 (remaining six months) $ 5,246 2017 12,451 2018 11,768 2019 10,248 2020 7,574 Thereafter 10,428 Total $ 57,715
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): Three months ended Six months ended July 1, July 3, July 1, July 3, Balance at beginning of period $ 4,966 $ 4,091 $ 3,913 $ 4,242 Balance assumed from TVN acquisition — — 1,012 — Accrual for current period warranties 1,716 1,530 2,975 3,125 Changes in liability related to pre-existing warranties (74 ) (92 ) (74 ) (92 ) Warranty costs incurred (1,513 ) (1,362 ) (2,731 ) (3,108 ) Balance at end of period $ 5,095 $ 4,167 $ 5,095 $ 4,167

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jul. 01, 2016
Equity [Abstract]
Components of Accumulated Other Comprehensive Loss	The components of AOCI, on an after-tax basis where applicable, were as follows (in thousands): Foreign Currency Translation Adjustments Unrealized Gains (Losses) on Cash Flow Hedges Unrealized Gains (Losses) on Available-for-Sale Investments Total Balance as of December 31, 2015 $ (2,634 ) $ (246 ) $ (1,538 ) $ (4,418 ) Other comprehensive income (loss) before reclassifications (677 ) 158 30 (489 ) Amounts reclassified from AOCI — 100 1,476 1,576 Provision for income taxes — — (23 ) (23 ) Balance as of July 1, 2016 $ (3,311 ) $ 12 $ (55 ) $ (3,354 ) The effects of amounts reclassified from AOCI into the Condensed Consolidated Statement of Operations were as follows (in thousands): Three months ended Six months ended July 1, 2016 July 3, 2015 July 1, 2016 July 3, 2015 Gains (losses) on cash flow hedges from foreign currency contracts: Cost of revenue $ (3 ) $ 19 $ (13 ) $ 26 Operating expenses (19 ) 119 (87 ) 161 Total reclassifications from AOCI $ (22 ) $ 138 $ (100 ) $ 187

Recent Accounting Pronounceme40

Recent Accounting Pronouncements - Narratives (Details) - USD ($) $ in Thousands	Jul. 01, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unamortized Debt Issuance Expense	$ 2,963	$ 3,223
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unamortized Debt Issuance Expense		3,200
New Accounting Pronouncement, Early Adoption, Effect [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Tax Assets, Net, Noncurrent		$ 15,900

Business Acquisition Narratives

Business Acquisition Narratives (Details) - USD ($)		Feb. 29, 2016	Jul. 01, 2016	Apr. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%			100.00%
Business Combination, Contingent Consideration, Liability, Current	[1]		$ 2,483,000			$ 2,483,000
Goodwill			235,369,000			235,369,000		$ 197,781,000
Indefinite-lived Intangible Assets Acquired			1,000,000
Gross Profit			51,040,000		$ 54,385,000	91,694,000	$ 109,413,000
Goodwill, Acquired During Period						37,630,000
Business Combination, Acquisition and Integration Related Expenses			3,400,000			6,500,000
TVN [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Contingent Consideration, Liability, Current				$ 8,000,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			5,500,000
Business Combination, Consideration Transferred		$ 84,600,000	82,546,000
Purchase Consideration Remain in Escrow			$ 13,500,000			13,500,000
Purchase Consideration Escrow Period			18 months
Goodwill			$ 37,630,000			37,630,000
Revenues			18,300,000			21,200,000
Gross Profit			6,900,000			7,100,000
Goodwill, Acquired During Period				$ 39,200,000
Business Combination, Acquisition Related Costs			885,000			3,321,000
In Process Research and Development | TVN [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	[2]		$ 0			0
Developed Technology | TVN [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			4 years
Maximum [Member] | In Process Research and Development | TVN [Member]
Business Acquisition [Line Items]
Project Completion Period			6 months
Fair Value Adjustment To Deferred Revenue [Member]
Business Acquisition [Line Items]
Revenues					$ 5,700,000		$ 8,100,000
TVN's 2015 backlog [Member] | TVN [Member]
Business Acquisition [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			$ 2,100,000
Contingent consideration for TVN acquisition not yet paid			$ 2,500,000			$ 2,500,000
TVN's 2015 backlog [Member] | Maximum [Member] | TVN [Member]
Business Acquisition [Line Items]
Contingent consideration for TVN acquisition not yet paid		$ 5,000,000
[1]	The TVN acquisition is subject to post-closing adjustments as set forth in the TVN Purchase Agreement to be determined within 90 days from the acquisition date in amounts capped to (i) the difference between €76 million (approximately $83.3 million as converted from euros into U.S. dollars using an agreed upon average exchange rate) and $75 million, with respect to an adjustment based on TVN’s 2015 revenue, and (ii) up to $5 million with respect to an adjustment based on TVN’s 2015 backlog that ships during the first half of 2016. During the second quarter of 2016, the Company paid $3.5 million upon the finalization of the revenue and working capital adjustments. The remaining backlog adjustment amount has been finalized at $2.5 million and will be paid in the third quarter of 2016.
[2]	By the end of the second quarter of 2016, the Company completed the TVN in-process research and development activities and as a result, the in-process research and development of $1.0 million was reclassified to developed technology.

Business Acquisition - Allocati

Business Acquisition - Allocation of Net Tangible and Intangible Assets (Details) - USD ($) $ in Thousands	Feb. 29, 2016	Jul. 01, 2016	Dec. 31, 2015
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill		$ 235,369	$ 197,781
TVN [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Cash and cash equivalents		7,063
Accounts receivable, net		14,923
Inventories		3,462
Prepaid expenses and other current assets		4,442
Property and equipment, net		9,988
French R&D tax credit receivables (1)		26,421
Other long-term assets		1,824
Total assets		68,123
Other debts and capital leases, current		8,362
Accounts payable		13,963
Deferred revenue		2,504
Accrued liabilities		18,524
Other debts and capital leases, long-term		16,087
Other long-term liabilities		6,415
Deferred tax liabilities		952
Total liabilities		66,807
Goodwill		37,630
Intangibles		43,600
Total Purchase Consideration	$ 84,600	$ 82,546

Business Acquisition - Intangib

Business Acquisition - Intangible Assets Useful Life (Details) - TVN [Member]	3 Months Ended
	Jul. 01, 2016USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Intangibles	$ 43,600,000
Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 months
Intangibles	$ 3,600,000
Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years
Intangibles	$ 21,400,000
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Intangibles	$ 18,000,000
In Process Research and Development
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	$ 0	[1]
Trade Name
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years
Intangibles	$ 600,000
[1]	By the end of the second quarter of 2016, the Company completed the TVN in-process research and development activities and as a result, the in-process research and development of $1.0 million was reclassified to developed technology.

Business Acquisition - Acquisit

Business Acquisition - Acquisition and Integration Expenses (Details) - TVN [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 01, 2016	Jul. 01, 2016
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs	$ 885	$ 3,321
Business Combination, Integration Related Costs	2,518	3,178
Cost of Goods, Product Line [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs	0	0
Business Combination, Integration Related Costs	433	491
Research and Development Expense [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs	0	0
Business Combination, Integration Related Costs	500	550
Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs	885	3,321
Business Combination, Integration Related Costs	1,585	2,137
Operating Expense [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs	885	3,321
Business Combination, Integration Related Costs	$ 2,085	$ 2,687

Business Acquisition - Pro Form

Business Acquisition - Pro Forma Disclosure (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Business Acquisition, Pro Forma Information [Abstract]
Business Acquisition, Pro Forma Revenue	$ 127.3	$ 200.1	$ 243.9
Business Acquisition, Pro Forma Net Income (Loss)	$ (8.9)	$ (40.3)	$ (27.9)
Business Acquisition ProForma Earnings Per Share Basic And Diluted	$ (0.10)	$ (0.52)	$ (0.31)

Short-Term Investments - Summar

Short-Term Investments - Summary of Short-Term Investments (Detail) - USD ($) $ in Thousands	Jul. 01, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	$ 13,752	$ 26,656
Gross Unrealized Gains	9	0
Gross Unrealized Losses	(1)	(52)
Total short-term investments, Estimated Fair Value	13,760	26,604
Corporate bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	13,752	25,557
Gross Unrealized Gains	9	0
Gross Unrealized Losses	(1)	(52)
Total short-term investments, Estimated Fair Value	$ 13,760	25,505
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost		1,099
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total short-term investments, Estimated Fair Value		$ 1,099

Short-Term Investments - Maturi

Short-Term Investments - Maturities of Short-Term Investments (Detail) - USD ($) $ in Thousands	Jul. 01, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Less than one year	$ 12,424	$ 19,642
Due in 1 - 2 years	1,336	6,962
Total short-term investments, Estimated Fair Value	$ 13,760	$ 26,604

Short-Term Investments - Additi

Short-Term Investments - Additional Information (Detail) $ in Thousands	Jul. 01, 2016USD ($)	Dec. 31, 2015USD ($)
Investments, Debt and Equity Securities [Abstract]
Cost Method Investments	$ 5,400	$ 5,400
Available-for-sale securities in a material unrealized loss position	0

Investments in Other Equity S49

Investments in Other Equity Securities Investments in Other Equity Securities (Details) - USD ($)		1 Months Ended	3 Months Ended				6 Months Ended		12 Months Ended
		Sep. 30, 2014	Jul. 01, 2016	Apr. 01, 2016	Jul. 03, 2015	Apr. 03, 2015	Jul. 01, 2016	Jul. 03, 2015	Dec. 31, 2015	Oct. 15, 2015	Oct. 22, 2014	Sep. 26, 2014	Sep. 02, 2014
Schedule of Cost-method Investments [Line Items]
Cost Method Investments Carrying Value			$ 5,400,000				$ 5,400,000		$ 5,400,000
Share Price			50.00%
Period Stock Price Below Cost							7 months
Research and development			$ 26,507,000		$ 21,816,000		$ 50,070,000	$ 44,145,000
Prepaid expenses and other current assets			43,317,000				43,317,000		25,003,000
Cost-method Investments, Other than Temporary Impairment			0		$ 0		1,476,000	$ 2,505,000
VJU GmbH [Member]
Schedule of Cost-method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent										9.90%		19.80%
Cost Method Investments Original Cost												$ 2,500,000
Research and development		$ 100,000
Cost-method Investments, Other than Temporary Impairment						$ 2,500,000
Vislink plc [Member]
Schedule of Cost-method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent													3.30%
Cost Method Investments Original Cost													$ 3,300,000
Cost Method Investments Carrying Value			1,800,000				1,800,000		1,800,000
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax							(60,000)		$ (1,500,000)
Cost-method Investments, Realized Losses				$ 1,500,000			0
EDC [Member]
Schedule of Cost-method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent											18.40%
Cost Method Investments Original Cost											$ 3,500,000
Cost-method Investments, Other than Temporary Impairment							0
Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments Carrying Value			3,593,000				3,593,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1]		3,593,000				3,593,000
Variable Interest Entity, Not Primary Beneficiary [Member] | VJU GmbH [Member]
Schedule of Cost-method Investments [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1]		0				0
Variable Interest Entity, Not Primary Beneficiary [Member] | EDC [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments Carrying Value			3,593,000				3,593,000
Business Acquisition, Transaction Costs	[2]		100,000				100,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1],[2]		3,593,000				3,593,000
Cost-method Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | VJU GmbH [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments Carrying Value			$ 0				$ 0
[1]	The Company did not provide financial support to any of its unconsolidated VIEs and as of July 1, 2016, there were no explicit arrangements or implicit variable interests that could require the Company to provide financial support to any of its unconsolidated VIEs.
[2]	The Company’s maximum exposure to loss with respect to EDC as of July 1, 2016 was limited to a total investment cost of $3.6 million, including $0.1 million of transaction costs.

Derivatives and Hedging Activit

Derivatives and Hedging Activities - Additional Information (Details) - USD ($)	6 Months Ended
	Jul. 01, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative Assets, Gross Amounts of Derivatives Offset in the Condensed Consolidated Balance Sheets	$ 0
Derivative Liabilities, Gross Amounts of Derivatives Offset in the Condensed Consolidated Balance Sheets	0
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$ 12,000	$ (246,000)
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Derivative, Term of Contract	3 months
Operating Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$ 12,000
Israel [Member]
Derivative [Line Items]
Compensating Balance, Amount	$ 2,500,000
Israel, New Shekels | Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Derivative, Term of Contract	12 months

Derivative and Hedging Activi51

Derivative and Hedging Activities gain losses in Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Derivatives, Fair Value [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	$ (22)		$ (100)
Gains reclassified from AOCI into income (effective portion)		$ 138		$ 187
Other Comprehensive Income (Loss) [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion		516	158	332
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion	(165)
Cost of Sales [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	(3)		(13)
Gains reclassified from AOCI into income (effective portion)		19		26
Operating Expense [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	(19)		(87)
Gains reclassified from AOCI into income (effective portion)		119		161
Other Nonoperating Income (Expense) [Member]
Derivatives, Fair Value [Line Items]
Losses recognized in income on derivatives (ineffectiveness portion and amount excluded from effectiveness testing)	(22)	(10)	(49)	(52)
Other Nonoperating Income (Expense) [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Gains (losses) recognized in income	$ (50)	$ 133	$ (334)	$ 385

Derivatives and Hedging Activ52

Derivatives and Hedging Activities Notional Amounts (Details) - Foreign Exchange Forward [Member] - USD ($) $ in Thousands	Jul. 01, 2016	Dec. 31, 2015
Long [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Notional Amount	$ 6,001	$ 12,984
Long [Member] | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Notional Amount	4,048	6,942
Short [Member] | Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Notional Amount	$ 14,854	$ 11,332

Derivatives and Hedging Activ53

Derivatives and Hedging Activities Assets Liabilities Balance Sheet Location (Details) - Foreign Exchange Contract [Member] - USD ($) $ in Thousands	Jul. 01, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Asset, Current	$ 59	$ 113
Derivative Liability, Current	125	371
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Current	23	13
Derivative Liability, Current	51	281
Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Current	23	13
Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Current	51	281
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Current	36	100
Derivative Liability, Current	74	90
Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Current	36	100
Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Current	$ 74	$ 90

Derivatives and Hedging Activ54

Derivatives and Hedging Activities Asset and Liability Offset (Details) $ in Thousands	Jul. 01, 2016USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Asset, Gross Amounts of Derivatives	$ 59
Derivative Assets, Gross Amounts of Derivatives Offset in the Condensed Consolidated Balance Sheets	0
Net Amounts of Derivatives Assets Presented in the Condensed Consolidated Balance Sheets	59
Derivative Assets, Gross Amounts of Derivatives Not Offset in the Condensed Consolidated Balance Sheets, Financial Instrument	(36)
Derivative Assets, Gross Amounts of Derivatives Not Offset in the Condensed Consolidated Balance Sheets,Cash Collateral Pledged	0
Derivative Assets, Net Amount	23
Derivative Liabilities, Gross Amounts of Derivatives	125
Derivative Liabilities, Gross Amounts of Derivatives Offset in the Condensed Consolidated Balance Sheets	0
Net Amounts of Derivatives Liability Presented in the Condensed Consolidated Balance Sheets	125
Derivative Liabilities, Gross Amounts of Derivatives Not Offset in the Condensed Consolidated Balance Sheets, Financial Instrument	(36)
Derivative Liabilities, Gross Amounts of Derivatives Not Offset in the Condensed Consolidated Balance Sheets, Cash Collateral Pledged	0
Derivative Liabilities, Net Amount	$ 89

Fair Value Measurements - Narra

Fair Value Measurements - Narratives (Details) - USD ($) $ in Thousands		3 Months Ended
		Jul. 01, 2016	Apr. 01, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Payments to Acquire Businesses		$ 2,900
Debt and Capital Lease Obligations		24,019
Business Combination, Contingent Consideration, Liability, Current	[1]	2,483
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible Debt, Fair Value Disclosures		100,900		$ 123,100
Debt and Capital Lease Obligations		24,000
TVN [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		(5,500)
Business Combination, Contingent Consideration, Liability, Current			$ 8,000
Cash Earnout [Member] | TVN [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Payments to Acquire Businesses		3,500
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		2,000
Cash Earnout [Member] | TVN [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Payments to Acquire Businesses		3,500
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		2,000
Business Combination, Contingent Consideration, Liability, Current		2,500	$ 8,000
Assumed Employee Equity Plans [Member] | TVN [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Current		$ 2,900
[1]	The TVN acquisition is subject to post-closing adjustments as set forth in the TVN Purchase Agreement to be determined within 90 days from the acquisition date in amounts capped to (i) the difference between €76 million (approximately $83.3 million as converted from euros into U.S. dollars using an agreed upon average exchange rate) and $75 million, with respect to an adjustment based on TVN’s 2015 revenue, and (ii) up to $5 million with respect to an adjustment based on TVN’s 2015 backlog that ships during the first half of 2016. During the second quarter of 2016, the Company paid $3.5 million upon the finalization of the revenue and working capital adjustments. The remaining backlog adjustment amount has been finalized at $2.5 million and will be paid in the third quarter of 2016.

Fair Value Measurements - Finan

Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value Based on Three-Tier Fair Value Hierarchy (Detail) - USD ($)		Jul. 01, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities, Fair Value Disclosure, Nonrecurring		$ 0
Assets, Fair Value Disclosure, Nonrecurring		0
Time deposit pledged for credit card facility	[1]	1,328,000	$ 1,093,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		24,642,000	107,569,000
Total liabilities measured and recorded at fair value		125,000	371,000
Fair Value, Measurements, Recurring [Member] | Cost-method Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		1,810,000	1,840,000
Bank Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Prepaids and other current assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Time deposit pledged for credit card facility		580,000	580,000
Money market funds [Member] | Fair Value, Measurements, Recurring [Member] | Cash equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		8,433,000	53,434,000
US Treasury Bill Securities [Member] | Fair Value, Measurements, Recurring [Member] | Cash equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value			24,998,000
Corporate bonds [Member] | Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		13,760,000	25,505,000
Foreign exchange forward contracts [Member] | Fair Value, Measurements, Recurring [Member] | Prepaids and other current assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		59,000	113,000
Foreign exchange forward contracts [Member] | Fair Value, Measurements, Recurring [Member] | Accrued Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities measured and recorded at fair value		125,000	371,000
Commercial Paper [Member] | Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value			1,099,000
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		10,243,000	80,272,000
Total liabilities measured and recorded at fair value		0	0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Cost-method Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		1,810,000	1,840,000
Level 1 [Member] | Bank Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Prepaids and other current assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Time deposit pledged for credit card facility		0
Level 1 [Member] | Money market funds [Member] | Fair Value, Measurements, Recurring [Member] | Cash equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		8,433,000	53,434,000
Level 1 [Member] | US Treasury Bill Securities [Member] | Fair Value, Measurements, Recurring [Member] | Cash equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value			24,998,000
Level 1 [Member] | Corporate bonds [Member] | Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		0	0
Level 1 [Member] | Foreign exchange forward contracts [Member] | Fair Value, Measurements, Recurring [Member] | Prepaids and other current assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		0	0
Level 1 [Member] | Foreign exchange forward contracts [Member] | Fair Value, Measurements, Recurring [Member] | Accrued Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities measured and recorded at fair value		0	0
Level 1 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value			0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		14,399,000	27,297,000
Total liabilities measured and recorded at fair value		125,000	371,000
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Cost-method Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		0	0
Level 2 [Member] | Bank Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Prepaids and other current assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Time deposit pledged for credit card facility		580,000	580,000
Level 2 [Member] | Money market funds [Member] | Fair Value, Measurements, Recurring [Member] | Cash equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		0	0
Level 2 [Member] | US Treasury Bill Securities [Member] | Fair Value, Measurements, Recurring [Member] | Cash equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value			0
Level 2 [Member] | Corporate bonds [Member] | Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		13,760,000	25,505,000
Level 2 [Member] | Foreign exchange forward contracts [Member] | Fair Value, Measurements, Recurring [Member] | Prepaids and other current assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		59,000	113,000
Level 2 [Member] | Foreign exchange forward contracts [Member] | Fair Value, Measurements, Recurring [Member] | Accrued Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities measured and recorded at fair value		125,000	371,000
Level 2 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value			1,099,000
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring 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] | Fair Value, Measurements, Recurring [Member] | Cost-method Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		0	0
Level 3 [Member] | Bank Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Prepaids and other current assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Time deposit pledged for credit card facility		0
Level 3 [Member] | Money market funds [Member] | Fair Value, Measurements, Recurring [Member] | Cash equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		0	0
Level 3 [Member] | US Treasury Bill Securities [Member] | Fair Value, Measurements, Recurring [Member] | Cash equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value			0
Level 3 [Member] | Corporate bonds [Member] | Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		0	0
Level 3 [Member] | Foreign exchange forward contracts [Member] | Fair Value, Measurements, Recurring [Member] | Prepaids and other current assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value		0	0
Level 3 [Member] | Foreign exchange forward contracts [Member] | Fair Value, Measurements, Recurring [Member] | Accrued Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities measured and recorded at fair value		$ 0	0
Level 3 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured and recorded at fair value			$ 0
[1]	The restricted cash balances are primarily held as cash collateral security for certain bank guarantees. These restricted funds are invested in bank deposits and cannot be withdrawn from the Company’s accounts without the prior written consent of the applicable secured party. Additionally, as of July 1, 2016, the Company recorded approximately $1.1 million of restricted cash for the bank guarantee associated with the TVN French Subsidiary’s office building lease. This amount is reported under “Other Long-term Assets” on the Company’s Condensed Consolidated Balance Sheets.

Balance Sheet Components - Acco

Balance Sheet Components - Accounts Receivable, Net, Prepaid Expenses and Other Current Assets, Inventories, Property and Equipment, Net (Detail) - USD ($) $ in Thousands		Jul. 01, 2016	Dec. 31, 2015
Accounts receivable, net:
Accounts receivable		$ 107,558	$ 73,855
Less: allowances for doubtful accounts, returns and discounts		(4,890)	(4,340)
Total		102,668	69,515
Prepaid expenses and other current assets:
Prepaid inventories to contract manufacturer(1)	[1]	8,500	8,500
Prepaid maintenance, royalty, rent and property taxes		6,530	5,974
Other Prepayments		7,242	2,762
Deferred cost of revenue		10,353	4,601
French R&D tax credits receivable(2)	[2]	6,203
Restricted cash(3)	[3]	1,328	1,093
Other		3,161	2,073
Prepaid Expense and Other Assets, Current		43,317	25,003
Inventories:
Raw materials		7,824	5,421
Work-in-process		1,186	1,950
Finished goods		15,640	19,827
Inventory, Supplies, Net of Reserves		11,974	11,621
Total inventories, net		36,624	38,819
Property and equipment, net:
Furniture and fixtures		9,026	7,808
Machinery and equipment		96,257	93,010
Capitalized software		34,428	29,391
Leasehold improvements		13,891	10,000
Property and equipment, gross		153,602	140,209
Less: accumulated depreciation and amortization		(117,085)	(113,197)
Property and equipment, net		36,517	27,012
Accrued Liabilities, Current [Abstract]
Accrued employee compensation and related expenses		18,379	12,083
Accrued sales and use tax and property taxes		3,540	1,743
Accrued TVN contingent consideration (1)	[4]	2,483
Accrued warranty		5,095	3,913
Accrued royalty payments		2,487	873
Contingent inventory reserves		3,649	1,315
Customer deposits and accrued customer rebates		4,319	1,851
Others		12,394	9,576
Accrued Liabilities, Current		$ 52,346	$ 31,354
[1]	From time to time, the Company makes advance payment to a supplier for future inventory in order to secure more favorable pricing. The Company anticipates that this amount will be offset in the first quarter of 2017 against the accounts payable owed to this supplier.
[2]	The Company’s acquired TVN subsidiary in France (the “TVN French Subsidiary”) participates in the French Crédit d’Impôt Recherche (“CIR”) program (the “R&D tax credits”) which allows companies to monetize eligible research expenses. The French R&D tax credits can be used to offset against income tax payable to the French government in each of the four years after being incurred, or if not utilized, are recoverable in cash. The amount of French R&D tax credits recoverable are subject to audit by the French government and during the second quarter of 2016, the French government approved the 2012 claim and refunded $5.8 million to the TVN French Subsidiary. The remaining R&D tax credit receivables at July 1, 2016 were approximately $23.1 million and are expected to be recoverable from 2017 through 2020 with $6.2 million reported under “Prepaid and other Current Assets” and $16.9 million reported under “Other Long-term Assets” on the Company’s Condensed Consolidated Balance Sheets. Pursuant to the TVN Purchase Agreement, the Company is indemnified by the selling shareholders with respect to the validity and recoverability of the outstanding TVN French Subsidiary R&D tax credit receivables.
[3]	The restricted cash balances are primarily held as cash collateral security for certain bank guarantees. These restricted funds are invested in bank deposits and cannot be withdrawn from the Company’s accounts without the prior written consent of the applicable secured party. Additionally, as of July 1, 2016, the Company recorded approximately $1.1 million of restricted cash for the bank guarantee associated with the TVN French Subsidiary’s office building lease. This amount is reported under “Other Long-term Assets” on the Company’s Condensed Consolidated Balance Sheets.
[4]	The TVN acquisition is subject to post-closing adjustments as set forth in the TVN Purchase Agreement to be determined within 90 days from the acquisition date in amounts capped to (i) the difference between €76 million (approximately $83.3 million as converted from euros into U.S. dollars using an agreed upon average exchange rate) and $75 million, with respect to an adjustment based on TVN’s 2015 revenue, and (ii) up to $5 million with respect to an adjustment based on TVN’s 2015 backlog that ships during the first half of 2016. During the second quarter of 2016, the Company paid $3.5 million upon the finalization of the revenue and working capital adjustments. The remaining backlog adjustment amount has been finalized at $2.5 million and will be paid in the third quarter of 2016.

Balance Sheet Components Additi

Balance Sheet Components Additional Information (Details) $ in Thousands, € in Millions		Feb. 29, 2016USD ($)	Jul. 01, 2016USD ($)	Feb. 29, 2016EUR (€)	Dec. 31, 2015USD ($)
Business Acquisition, Contingent Consideration [Line Items]
Income Taxes Receivable, Current	[1]		$ 6,203
Post-closing Adjustments Period		90 days
Other Payments to Acquire Businesses			2,900
Restricted cash(3)	[2]		1,328		$ 1,093
TVN [Member]
Business Acquisition, Contingent Consideration [Line Items]
Proceeds from Income Tax Refunds			5,800
Income Taxes Receivable			23,100
TVN's 2015 backlog [Member] | TVN [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability			2,500
TVN's 2015 backlog [Member] | TVN [Member] | Maximum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability		$ 5,000
Cash Earnout [Member] | TVN [Member]
Business Acquisition, Contingent Consideration [Line Items]
Other Payments to Acquire Businesses			3,500
TVN's 2015 revenue, difference as converted from euros to US dollars [Member] | TVN [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability		75,000
TVN's 2015 revenue, difference as converted from euros to US dollars [Member] | TVN [Member] | Maximum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability		$ 83,300		€ 76
Property Lease Guarantee [Member] | Other Noncurrent Assets [Member] | TVN [Member]
Business Acquisition, Contingent Consideration [Line Items]
Restricted Cash and Cash Equivalents			1,100
Research Tax Credit Carryforward [Member] | TVN [Member]
Business Acquisition, Contingent Consideration [Line Items]
Income Taxes Receivable, Noncurrent	[1]		23,100
Research Tax Credit Carryforward [Member] | Prepaid Expenses and Other Current Assets [Member] | TVN [Member]
Business Acquisition, Contingent Consideration [Line Items]
Income Taxes Receivable, Current	[1]		6,200
Research Tax Credit Carryforward [Member] | Other Noncurrent Assets [Member] | TVN [Member]
Business Acquisition, Contingent Consideration [Line Items]
Income Taxes Receivable, Current	[1]		$ 16,900
[1]	The Company’s acquired TVN subsidiary in France (the “TVN French Subsidiary”) participates in the French Crédit d’Impôt Recherche (“CIR”) program (the “R&D tax credits”) which allows companies to monetize eligible research expenses. The French R&D tax credits can be used to offset against income tax payable to the French government in each of the four years after being incurred, or if not utilized, are recoverable in cash. The amount of French R&D tax credits recoverable are subject to audit by the French government and during the second quarter of 2016, the French government approved the 2012 claim and refunded $5.8 million to the TVN French Subsidiary. The remaining R&D tax credit receivables at July 1, 2016 were approximately $23.1 million and are expected to be recoverable from 2017 through 2020 with $6.2 million reported under “Prepaid and other Current Assets” and $16.9 million reported under “Other Long-term Assets” on the Company’s Condensed Consolidated Balance Sheets. Pursuant to the TVN Purchase Agreement, the Company is indemnified by the selling shareholders with respect to the validity and recoverability of the outstanding TVN French Subsidiary R&D tax credit receivables.
[2]	The restricted cash balances are primarily held as cash collateral security for certain bank guarantees. These restricted funds are invested in bank deposits and cannot be withdrawn from the Company’s accounts without the prior written consent of the applicable secured party. Additionally, as of July 1, 2016, the Company recorded approximately $1.1 million of restricted cash for the bank guarantee associated with the TVN French Subsidiary’s office building lease. This amount is reported under “Other Long-term Assets” on the Company’s Condensed Consolidated Balance Sheets.

Goodwill and Intangible Assets

Goodwill and Intangible Assets - Narratives (Details) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jul. 01, 2016USD ($)$ / shares	Apr. 01, 2016USD ($)	Dec. 31, 2015USD ($)	Jul. 03, 2015USD ($)	Jul. 01, 2016USD ($)$ / shares
Goodwill [Line Items]
Share Price | $ / shares	$ 3.01				$ 3.01
Market Capitalization	$ 235,000				$ 235,000
Goodwill	235,369		$ 197,781		235,369
Number of Reporting Units			2
Preliminary Recorded Additional Goodwill					37,630
Goodwill, Impairment Loss	0			$ 0
Video [Member]
Goodwill [Line Items]
Goodwill	174,560		$ 136,904		174,560
Preliminary Recorded Additional Goodwill					37,630
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount			87.00%
Cable Edge [Member]
Goodwill [Line Items]
Goodwill	60,809		$ 60,877		60,809
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount			42.00%
TVN [Member]
Goodwill [Line Items]
Goodwill	37,630				37,630
Preliminary Recorded Additional Goodwill		$ 39,200
Finite-lived Intangible Assets Acquired					$ 43,800
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(5,500)
Cash Earnout [Member] | TVN [Member]
Goodwill [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ 2,000

Goodwill and Identified Intan60

Goodwill and Identified Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jul. 01, 2016USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 197,781
Goodwill, Acquired During Period	37,630
Foreign currency translation adjustment	(42)
Balance at end of period	235,369
Video [Member]
Goodwill [Line Items]
Balance at beginning of period	136,904
Goodwill, Acquired During Period	37,630
Foreign currency translation adjustment	26
Balance at end of period	174,560
Cable Edge [Member]
Goodwill [Line Items]
Balance at beginning of period	60,877
Foreign currency translation adjustment	(68)
Balance at end of period	$ 60,809

Goodwill and Identified Intan61

Goodwill and Identified Intangible Assets - Summary of Goodwill and Identified Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jul. 01, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 89,495	$ 45,687
Accumulated Amortization	(49,857)	(41,590)
Total future amortization expense	$ 39,638	4,097
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Useful Life	3 years 8 months 12 days
Gross Carrying Amount	$ 32,489	10,987
Accumulated Amortization	(12,695)	(10,987)
Total future amortization expense	$ 19,794	0
Customer relationships/contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life	4 years 4 months 24 days
Gross Carrying Amount	$ 47,286	29,200
Accumulated Amortization	(29,392)	(25,752)
Total future amortization expense	$ 17,894	3,448
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life	3 years 8 months 12 days
Gross Carrying Amount	$ 603
Accumulated Amortization	(50)
Total future amortization expense	$ 553
Maintenance agreements and related relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life	2 months
Gross Carrying Amount	$ 5,500	5,500
Accumulated Amortization	(5,309)	(4,851)
Total future amortization expense	$ 191	$ 649
Backlog
Finite-Lived Intangible Assets [Line Items]
Useful Life	2 months 24 days
Gross Carrying Amount	$ 3,617
Accumulated Amortization	(2,411)
Total future amortization expense	$ 1,206

Goodwill and Identified Intan62

Goodwill and Identified Intangible Assets - Amortization Expense for Identifiable Purchased Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Included in cost of revenue	$ 1,307	$ 86	$ 1,725	$ 547
Included in operating expenses	4,232	1,446	6,597	2,892
Total amortization expense	$ 5,539	$ 1,532	$ 8,322	$ 3,439

Goodwill and Identified Intan63

Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense of Purchased Intangible Assets (Detail) - USD ($) $ in Thousands	Jul. 01, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
2016 (remaining six months)	$ 6,983
2,017	9,144
2,018	9,144
2,019	9,144
2,020	4,620
Thereafter	603
Total future amortization expense	39,638	$ 4,097
Cost of Sales [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2016 (remaining six months)	2,688
2,017	5,376
2,018	5,376
2,019	5,376
2,020	978
Thereafter	0
Total future amortization expense	19,794
Operating Expense [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2016 (remaining six months)	4,295
2,017	3,768
2,018	3,768
2,019	3,768
2,020	3,642
Thereafter	603
Total future amortization expense	$ 19,844

Restructuring and Related Cha64

Restructuring and Related Charges - Activities in Restructuring Accrual (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Product cost of revenue	$ 6	$ 0	$ (23)	$ 0
Restructuring and related charges	1,903	185	4,515	229
Total restructuring and related charges	1,909	$ 185	4,492	$ 229
Harmonic 2016 Restructuring Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges			4,557
Adjustment to restructuring provisions			1,087
Cash payments			(1,799)
Non-cash write-offs			(246)
Foreign exchange gain (loss)			(5)
Ending Balance	3,594		3,594
Harmonic 2016 Restructuring Plan [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges			200
Restructuring Reserve [Roll Forward]
Restructuring charges			246
Adjustment to restructuring provisions			0
Cash payments			0
Non-cash write-offs			(246)
Ending Balance	0		0
Harmonic 2016 Restructuring Plan [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges			1,400
Restructuring Reserve [Roll Forward]
Restructuring charges	1,400		1,418
Adjustment to restructuring provisions			1,087
Cash payments			(468)
Non-cash write-offs			0
Ending Balance	2,037		2,037
Harmonic 2016 Restructuring Plan [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and related charges	1,900		3,000
Restructuring Reserve [Roll Forward]
Restructuring charges			2,893
Adjustment to restructuring provisions			0
Cash payments			(1,331)
Non-cash write-offs			0
Foreign exchange gain (loss)			(5)
Ending Balance	1,557		1,557
Harmonic Two Thousand And Fifteen Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges					$ 2,200	$ 1,500
Harmonic Two Thousand And Fifteen Restructuring [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			264
Adjustment to restructuring provisions			(65)
Cash payments	(194)
Ending Balance	$ 5		$ 5		$ 264

Restructuring and Related Cha65

Restructuring and Related Charges - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 01, 2016USD ($)Employee	Jul. 03, 2015USD ($)	Jul. 01, 2016USD ($)Employee	Jul. 03, 2015USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)Employee	Dec. 31, 2014USD ($)	Jan. 04, 2016USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	$ 1,909	$ 185	$ 4,492	$ 229
Business Combination, Acquisition and Integration Related Expenses	$ 3,400		6,500
Harmonic 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Charges for 2016 Harmonic Restructuring Plan			$ 4,557
Number of positions eliminated | Employee	8		21
Harmonic Two Thousand And Fifteen Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Charges for 2016 Harmonic Restructuring Plan						$ 2,200	$ 1,500
Number of positions eliminated | Employee						56
Facility Closing [Member] | Harmonic 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Fair Value of Excess Facility Restructuring								$ 2,500
Deferred Rent Credit								$ 1,100
Restructuring Costs			$ 1,400
Charges for 2016 Harmonic Restructuring Plan	$ 1,400		1,418
Employee Severance [Member] | Harmonic 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	1,900		3,000
Charges for 2016 Harmonic Restructuring Plan			2,893
Other Restructuring [Member] | Harmonic 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs			200
Charges for 2016 Harmonic Restructuring Plan			246
TVN [Member]
Restructuring Cost and Reserve [Line Items]
Business Combination, Acquisition Related Costs	885		3,321
TVN [Member] | Operating Expense [Member]
Restructuring Cost and Reserve [Line Items]
Business Combination, Acquisition Related Costs	885		3,321
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Anticipated Synergies from Restructuring Exit Plan	20,000		20,000
Minimum [Member] | Scenario, Forecast [Member] | TVN [Member] | Harmonic 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs					$ 22,000
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Anticipated Synergies from Restructuring Exit Plan	$ 22,000		$ 22,000
Maximum [Member] | Scenario, Forecast [Member] | TVN [Member] | Harmonic 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs					$ 24,000

Convertible Notes, Other Debt66

Convertible Notes, Other Debts And Capital Leases - Additional Information (Detail) $ / shares in Units, shares in Millions		Dec. 14, 2015shares	Dec. 31, 2015USD ($)$ / shares	Jul. 01, 2016USD ($)$ / shares	Apr. 01, 2016USD ($)	Dec. 31, 2015USD ($)$ / shares	Jul. 01, 2016EUR (€)
Debt Instrument [Line Items]
Financing from French government agencies related to various government incentive programs (1)	[1]			$ 18,977,000
Debt Instrument, Interest Rate, Stated Percentage			4.00%			4.00%
Debt Instrument, Face Amount			$ 128,250,000	$ 128,250,000		$ 128,250,000
Debt Issuance Cost			$ 3,500,000		$ 4,100,000
Debt Instrument, Convertible, Conversion Ratio						173.9978
Debt Instrument, Convertible, Conversion Price | $ / shares			$ 5.75	$ 5.75		$ 5.75
Debt Conversion, Converted Instrument, Amount						$ 1,000
Percentage Of Principal Amount Of Convertible Notes Is Equal To Repurchase Price						100.00%
Debt Instrument Convertible Allocated Amount of Equity Component			$ 26,925,000	$ 26,925,000		$ 26,925,000
Debt Instrument, Unamortized Discount (Premium), Net			4,100,000			4,100,000
Unamortized Debt Issuance Expense			3,223,000	2,963,000		3,223,000
Debt Instrument Convertible Equity Component Issuance Cost			$ 863,000	863,000		$ 863,000
Stock price greater or equal 130 percent of Note Conversion Price [Member]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Trading Days						20
Debt Instrument, Convertible, Threshold Consecutive Trading Days						30 days
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger						130.00%
Note price less than 98 percent of stock price times conversion rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Trading Days						5
Debt Instrument, Convertible, Threshold Consecutive Trading Days						5 days
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger						98.00%
Privately Negotiated Transactions [Member]
Debt Instrument [Line Items]
Proceeds from Convertible Debt						$ 49,900,000
Stock Repurchased and Retired During Period, Shares | shares		11.1
TVN [Member]
Debt Instrument [Line Items]
Income Taxes Receivable				23,100,000
Loans Backed By French Research And Development Tax Credit Receivables [Member] | TVN [Member]
Debt Instrument [Line Items]
Financing from French government agencies related to various government incentive programs (1)	[1]			$ 15,400,000
Debt Instrument, Interest Rate, Stated Percentage				0.60%			0.60%
Adjusted EURIBOR Rate, Term				1 month
Debt Instrument, Basis Spread on Variable Rate				1.30%
Loans From French Government For R&D Innovation Projects [Member]
Debt Instrument [Line Items]
Financing from French government agencies related to various government incentive programs (1)	[1]			$ 3,600,000
Foreign Line of Credit [Member] | BPI France [Member]
Debt Instrument [Line Items]
Maximum Advance Credit Line For Receivables				2,200,000			€ 2,000,000
Restricted Cash and Cash Equivalents				$ 200,000			200,000
Foreign Line of Credit [Member] | GE Capital Cofacredit [Member]
Debt Instrument [Line Items]
Secured Borrowing On Receivables, Percentage Available, Maximum				90.00%
Guarantee Fund Percentage of Qualified Customer Invoices				10.00%
Guarantee Fund on Qualified Customer Invoices				$ 100,000			€ 80,000
Holdback Reserve on Receivables, Percentage				10.00%
[1]	As of July 1, 2016, the Company’s TVN French Subsidiary had an aggregate of $19.0 million of loans due to various financing programs of French government agencies, $15.4 million of which is related to loans backed by French R&D tax credit receivables. As of July 1, 2016, the TVN French Subsidiary had an aggregate of $23.1 million of R&D tax credit receivables from the French government from 2017 through 2020. (See Note 8, “Balance Sheet Components-Prepaid expenses and other current assets” for more information). The R&D tax loans have a fixed rate of 0.6%, plus EURIBOR 1 month + 1.3% and matures between 2017 through 2019. The remaining loans of $3.6 million at July 1, 2016 primarily relates to financial support from French government agencies for R&D innovation projects at minimal interest rates and these loans mature between 2020 through 2023.

Convertible Notes, Other Debt67

Convertible Notes, Other Debts And Capital Leases - Convertible Note Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 01, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Principal amount	$ 128,250	$ 128,250
Less: Debt discount, net of amortization	(24,575)	(26,732)
Less: Debt issuance costs, net of amortization	(2,963)	(3,223)
Carrying amount	$ 100,712	$ 98,295
Remaining amortization period (years)	4 years 4 months 20 days	4 years 10 months 28 days
Effective interest rate on liability component	9.94%	9.94%
Value of conversion option	$ 26,925	$ 26,925
Less: Equity issuance costs	(863)	(863)
Carrying amount	$ 26,062	$ 26,062

Convertible Notes, Other Debt68

Convertible Notes, Other Debts And Capital Leases - Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Debt Disclosure [Abstract]
Contractual interest expense	$ 1,282	$ 0	$ 2,565	$ 0
Amortization of debt discount	1,098	0	2,157	0
Amortization of debt issuance costs	132	0	260	0
Total interest expense recognized	$ 2,512	$ 0	$ 4,982	$ 0

Convertible Notes , Other Debts

Convertible Notes , Other Debts And Capital Leases - Other Debt and Capital Lease Obligations (Details) - USD ($) $ in Thousands		Jul. 01, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Financing from French government agencies related to various government incentive programs (1)	[1]	$ 18,977
Term loans (2)	[2]	1,616
Secured borrowings (3)	[3]	1,100
Obligations under capital leases		2,326
Total debt obligations		24,019
Less: current portion		(7,829)	$ 0
Long-term portion		$ 16,190
[1]	As of July 1, 2016, the Company’s TVN French Subsidiary had an aggregate of $19.0 million of loans due to various financing programs of French government agencies, $15.4 million of which is related to loans backed by French R&D tax credit receivables. As of July 1, 2016, the TVN French Subsidiary had an aggregate of $23.1 million of R&D tax credit receivables from the French government from 2017 through 2020. (See Note 8, “Balance Sheet Components-Prepaid expenses and other current assets” for more information). The R&D tax loans have a fixed rate of 0.6%, plus EURIBOR 1 month + 1.3% and matures between 2017 through 2019. The remaining loans of $3.6 million at July 1, 2016 primarily relates to financial support from French government agencies for R&D innovation projects at minimal interest rates and these loans mature between 2020 through 2023.
[2]	One of the term loans with a certain financial institution contains annual covenants that require the TVN French Subsidiary to maintain a minimum working capital balance and various other financial covenants and restrictions that limit the French Subsidiary’s ability to incur additional indebtedness. The annual covenant is based on French statutory year-end results and the French subsidiary was in compliance for 2015.
[3]	The TVN French Subsidiary obtained advances under a credit line with BPI France against a pool of eligible receivables with recourse. The maximum advance under this credit line for receivables is €2 million (approximately $2.2 million as converted using the exchange rate at July 1, 2016), less applicable fees, and €200,000 (approximately $0.2 million as converted using the exchange rate at July 1, 2016) of cash is pledged for this program. This credit line was renewed in July 2016 for an additional year with no material change to the terms of the credit agreement. The TVN French Subsidiary also entered into an accounts receivable financing agreement with GE Capital Cofacredit, (“GE”) on September 27, 2013, which is subject to automatic renewal unless cancelled. GE advances up to 90% of qualified customer invoices and holds the remaining 10% as a guarantee fund up with a minimum of €80,000 (approximately $0.1 million as converted using the exchange rate at July 1, 2016). In addition, another 10% of outstanding receivables is set aside in a holdback receivable and released upon payments received from the customers. These arrangements are treated as secured borrowings in accordance with FASB ASC 860, Transfers and Servicing.

Convertible Notes, Other Debt70

Convertible Notes, Other Debts And Capital Leases - Debt Maturities (Details) $ in Thousands	Jul. 01, 2016USD ($)
Debt Disclosure [Abstract]
Capital Leases, Future Minimum Payments, Remainder of Fiscal Year	$ 590
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	1,354
Capital Leases, Future Minimum Payments Due in Two Years	1,116
Long-term Debt, Maturities, Repayments of Principal in Year Two	5,622
Capital Leases, Future Minimum Payments Due in Three Years	527
Long-term Debt, Maturities, Repayments of Principal in Year Three	5,779
Capital Leases, Future Minimum Payments Due in Four Years	67
Long-term Debt, Maturities, Repayments of Principal in Year Four	6,662
Capital Leases, Future Minimum Payments Due in Five Years	26
Long-term Debt, Maturities, Repayments of Principal in Year Five	665
Capital Leases, Future Minimum Payments Due Thereafter	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	1,611
Capital Leases, Future Minimum Payments Due	2,326
Long-term Debt	$ 21,693

Employee Benefit Plans and St71

Employee Benefit Plans and Stock-based Compensation - Additional Information (Detail)	Jun. 09, 2016shares	Jul. 01, 2016USD ($)$ / sharesshares	Jul. 03, 2015USD ($)$ / shares	Jul. 01, 2016USD ($)$ / sharesshares	Jul. 03, 2015USD ($)$ / shares	Dec. 31, 2015	Feb. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in authorized shares for ESPP | shares				2,000,000
Intrinsic value of options exercised			$ 300,000		$ 1,600,000
Other Payments to Acquire Businesses		$ 2,900,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		2.00%		2.00%
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		$ 0		$ 0
Pension and Other Postretirement Benefit Contributions		0
Defined Benefit Plan, Net Periodic Benefit Cost		100,000		$ 133,000
Discretionary contributions of plan				25.00%
Percent of employees' gross pay eligible for matching				4.00%
Maximum contribution amount per participant				$ 1,000
Contributions in period				241,000	$ 242,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 10,400,000		$ 10,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		1 year 9 months 18 days
Discount Percentage On Purchase Of Stock		15.00%
Percentage of fair market value of Common Stock to purchase shares		85.00%
Value Of Stock Purchase Right Percentage Of Put Option		15.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares		$ 1.07	$ 2.44	$ 0.97	$ 2.63
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		$ 400,000	$ 600,000	$ 1,400,000	$ 1,900,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options		0	120,000	0	22,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 500,000	$ 1,600,000	$ 7,100,000	$ 7,600,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in authorized shares for ESPP | shares	1,500,000
Common Stock, Capital Shares Reserved for Future Issuance | shares		906,390		906,390
TVN [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Business Combination Assumed Equity Benefit Plan							2
Fair Value of Employee Equity Benefit Plan Liabilities		$ 18,524,000		$ 18,524,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		2.00%		2.00%
TVN [Member] | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in authorized shares for ESPP | shares		1,750,000
Stock Plan 1995 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in authorized shares for ESPP | shares	2,000,000
Euro Zone AA Rated [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term Euro zone AA rated, Term						10 years
Long-term Euro zone AA rated 10 years corporate bonds yield						2.00%

Employee Benefit Plans and St72

Employee Benefit Plans and Stock-based Compensation - Summary of Company's Stock Option and Restricted Stock Unit Activity (Detail) - $ / shares shares in Thousands	6 Months Ended
	Jul. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available for Grant, Beginning balance	6,150
Shares Available for Grant, Authorized	2,000
Shares Available for Grant, Granted	(2,890)
Shares Available for Grant, Forfeited or cancelled	1,754
Shares Available for Grant, Ending balance	7,014
Restricted Stock Units Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Units, Beginning balance	2,182
Number of Shares, Authorized	0
Number of Units, Granted	1,336
Number of Units, exercised	0
Number of Units, Shares released	(1,054)
Number of Units, Forfeited or cancelled	(253)
Number of Units, Ending balance	2,211
Weighted Average Grant Date Fair Value, Beginning balance	$ 6.99
Weighted Average Grant Date Fair Value, Authorized	0
Estimated weighted average fair value per share at purchase date	3.14
Weighted Average Grant Date Fair Value, Exercised	0
Weighted Average Grant Date Fair Value, Shares released	6.72
Weighted Average Grant Date Fair Value, Forfeited or cancelled	5.89
Weighted Average Grant Date Fair Value, Ending balance	$ 4.74
Stock Options Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning balance	5,674
Number of Shares, Authorized	0
Number of Shares, Granted	886
Number of Shares, Options exercised	(1)
Number of Shares, Forfeited or cancelled	(1,375)
Number of Shares, Ending balance	5,184
Weighted Average Exercise Price, Beginning balance	$ 6.56
Weighted Average Exercise Price, Authorized	0
Weighted Average Exercise Price, Granted	3.15
Weighted Average Exercise Price, Options exercised	2.25
Weighted Average Exercise Price, Forfeited or cancelled	6.43
Weighted Average Exercise Price, Ending balance	$ 6.02

Employee Benefit Plans and St73

Employee Benefit Plans and Stock-based Compensation - Summary of Stock Options Outstanding (Detail) - Stock Options Outstanding [Member] $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jul. 01, 2016USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Vested and expected to vest | shares	4,882
Weighted Average Exercise Price, Vested and expected to vest | $ / shares	$ 6.07
Weighted Average Remaining Contractual Term (Years), Vested and expected to vest	4 years 1 month
Aggregate Intrinsic Value, Vested and expected to vest | $	$ 98
Number of Shares, Exercisable | shares	3,057
Weighted Average Exercise Price, Exercisable | $ / shares	$ 6.54
Weighted Average Remaining Contractual Term (Years), Exercisable	3 years
Aggregate Intrinsic Value, Exercisable | $	$ 98

Employee Benefit Plans and St74

Employee Benefit Plans and Stock-based Compensation - Summary of Restricted Stock Units Outstanding (Detail) - Restricted Stock Units Outstanding [Member] shares in Thousands, $ in Thousands	6 Months Ended
	Jul. 01, 2016USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Underlying Restricted Stock Units | shares	1,959
Weighted Average Remaining Vesting Period (Years)	10 months 15 days
Aggregate Fair Value | $	$ 5,897

Employee Benefit Plans and St75

Employee Benefit Plans and Stock-based Compensation - Summary of Projected Benefit Obligation (Details) $ in Thousands	6 Months Ended
	Jul. 01, 2016USD ($)
Employee Benefits and Share-based Compensation [Abstract]
Acquired from TVN acquisition	$ 5,907
Service cost	94
Interest cost	39
Foreign currency translation adjustment	27
As of July 1, 2016	6,067
Current portion (presented under “Accrued liabilities”)	243
Long-term portion (presented under “Other non-current liabilities”)	$ 5,824

Employee Benefit Plans and St76

Employee Benefit Plans and Stock-based Compensation (Details)	6 Months Ended
	Jul. 01, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Discount rate	2.00%
Mobility rate	2.20%
Salary progression rate	2.00%

Employee Benefit Plans and St77

Employee Benefit Plans and Stock-based Compensation - Benefit Obligation Payments By Years (Details) $ in Thousands	Jul. 01, 2016USD ($)
Postemployment Benefits [Abstract]
2016 (remaining six months)	$ 47
2,017	117
2,018	227
2,019	366
2,020	433
2021 - 2025	2,311
Future benefits expected to be paid in next 5 years and five-year period thereafter	$ 3,501

Employee Benefit Plans and St78

Employee Benefit Plans and Stock-based compensation - Stock-based Compensation in Opex (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 2,768	$ 3,884	$ 5,862	$ 8,018
Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	424	422	651	950
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	841	1,027	1,810	2,175
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	1,503	2,435	3,401	4,893
Operating Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 2,344	$ 3,462	$ 5,211	$ 7,068

Employee Benefit Plans and St79

Employee Benefit Plans and Stock-based Compensation - Valuation Assumptions for Stock Options (Details) - Stock Options [Member]	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	4 years 3 months 18 days	4 years 7 months 6 days	4 years 3 months 18 days	4 years 8 months 13 days
Volatility	36.00%	37.00%	36.00%	38.00%
Risk-free interest rate	1.10%	1.50%	1.40%	1.50%
Expected dividends	0.00%	0.00%	0.00%	0.00%

Employee Benefit Plans and St80

Employee Benefit Plans and Stock-based Compensation - Summary of Stock Awards Valuation Assumptions (Details) - Employee Stock Purchase Plan - $ / shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Purchase Period June 30, 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)		6 months 1 day
Volatility		35.00%
Risk-free interest rate		0.10%
Expected dividends		0.00%
Estimated weighted average fair value per share at purchase date		$ 1.75
Purchase Period June 30, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	6 months 1 day
Volatility	54.00%
Risk-free interest rate	0.40%
Expected dividends	0.00%
Estimated weighted average fair value per share at purchase date	$ 1.19

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Income Tax Disclosure [Abstract]
Loss before income taxes	$ (20,437)	$ (267)	$ (45,099)	$ (3,210)
Provision for income taxes	$ 242	$ 727	$ 760	$ 441
Effective income tax rate	(1.20%)	(272.30%)	(1.70%)	(13.70%)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 16.3		$ 16.3
Effective income tax rate	(1.20%)	(272.30%)	(1.70%)	(13.70%)
Federal statutory income tax rate			35.00%	35.00%
Unrecognized tax benefits that would impact the provision for income taxes	$ 4		$ 4
Interest and possible penalties related to uncertain tax positions	$ 0.6		$ 0.6
SWITZERLAND
Income Tax Contingency [Line Items]
Income Tax Holiday, Description			The Company’s operations in Switzerland are 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.

Income (Loss) Per Share - Numer

Income (Loss) Per Share - Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Numerator:
Net loss	$ (20,679)	$ (994)	$ (45,859)	$ (3,651)
Denominator:
Basic and diluted	77,342	88,426	77,168	88,541
Net loss per share:
Basic and diluted	$ (0.27)	$ (0.01)	$ (0.59)	$ (0.04)

Income (Loss) Per Share - Anti-

Income (Loss) Per Share - Anti-dilutive Securities (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive equity awards outstanding	8,327,000	9,751,000	7,853,000	9,696,000
Potential Common Shares Upon Notes Conversion If Only Settled In Shares	22,304,348		22,304,348
Debt Instrument, Convertible, Conversion Price	$ 5.75		$ 5.75		$ 5.75
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive equity awards outstanding	5,428,000	6,840,000	5,488,000	6,964,000
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive equity awards outstanding	2,247,000	2,462,000	2,010,000	2,256,000
Employee Stock Purchase Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive equity awards outstanding	652,000	449,000	355,000	476,000

Segment Information (Details)

Segment Information (Details) $ in Thousands		3 Months Ended			6 Months Ended		9 Months Ended
		Jul. 01, 2016USD ($)	Jul. 03, 2015USD ($)	Dec. 31, 2014segment	Jul. 01, 2016USD ($)	Jul. 03, 2015USD ($)	Sep. 26, 2014segment
Segment Reporting Information [Line Items]
Provision for excess and obsolete inventories					$ 5,203	$ 843
Revenue, Net		$ 109,571	$ 103,103		191,403	207,119
Income (loss) from operations		(18,118)	(343)		(38,874)	(330)
Operating Expenses		(69,158)	(54,728)		(130,568)	(109,743)
Stock-based compensation		(2,768)	(3,884)		(5,862)	(8,018)
Amortization of intangibles		(5,539)	(1,532)		(8,322)	(3,439)
Nonoperating Income (Expense)		(2,319)	76		(6,225)	(2,880)
Loss before income taxes		$ (20,437)	(267)		$ (45,099)	(3,210)
Number of Reportable Segments | segment				2			1
Business Acquisition, Percentage of Voting Interests Acquired		100.00%			100.00%
Video [Member]
Segment Reporting Information [Line Items]
Revenue, Net		$ 90,588	78,207		$ 155,596	147,489
Cable Edge [Member]
Segment Reporting Information [Line Items]
Revenue, Net		18,983	24,896		35,807	59,630
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations		20	5,258		(9,180)	11,356
Operating Segments [Member] | Video [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations		518	4,901		(6,829)	4,811
Operating Segments [Member] | Cable Edge [Member]
Segment Reporting Information [Line Items]
Provision for excess and obsolete inventories		4,500
Income (loss) from operations		(498)	357		(2,351)	6,545
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating Expenses	[1]	$ (9,831)	$ (185)		$ (15,510)	$ (229)
[1]	Unallocated corporate expenses include certain corporate-level operating expenses and charges such as restructuring and related charges and excess facilities charges. Additionally, the unallocated corporate expenses in 2016 include TVN acquisition- and integration-related costs (see Note 3, “Business Acquisition” for additional information) and an inventory obsolescence charge of approximately $4.5 million recorded in the second quarter of 2016 for some older Cable Edge product lines in accordance with the Company’s policy for excess and obsolete inventory and also as part of our strategic plan to re-position and dedicate the Company’s primary Cable Edge resources to its new CableOS products.

Commitments and Contingencies -

Commitments and Contingencies - Future Minimum Lease Payments Under Non-cancelable Operating Leases (Detail) $ in Thousands	Jul. 01, 2016USD ($)
Commitments and Contingencies Disclosure [Abstract]
2016 (remaining six months)	$ 5,246
2,016	12,451
2,017	11,768
2,018	10,248
2,019	7,574
Thereafter	10,428
Total	$ 57,715

Commitments and Contingencies87

Commitments and Contingencies - Summary of Warranty Accrual Included in Accrued Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 4,966	$ 4,091	$ 3,913	$ 4,242
Balance assumed from TVN acquisition	0		1,012
Accrual for current period warranties	1,716	1,530	2,975	3,125
Product Warranty Accrual, Preexisting, Increase (Decrease)	(74)	(92)	(74)	(92)
Warranty costs incurred	(1,513)	(1,362)	(2,731)	(3,108)
Balance at end of period	$ 5,095	$ 4,167	$ 5,095	$ 4,167

Commitments and Contingencies88

Commitments and Contingencies - Additional Information (Detail) € in Millions		Feb. 29, 2016USD ($)	Jun. 30, 2012Patents	Oct. 30, 2011Patents	Jul. 01, 2016USD ($)	Apr. 01, 2016USD ($)	Feb. 29, 2016EUR (€)
Other Commitments [Line Items]
Non-cancelable purchase commitments					$ 22,400,000
Post-closing Adjustments Period		90 days
Maximum amount of potential future payments under the company's financial guarantees					700,000
Other Payments to Acquire Businesses					2,900,000
Business Combination, Contingent Consideration, Liability, Current	[1]				2,483,000
Loss Contingency, Patents Allegedly Infringed, Number | Patents			1	2
Guarantee Obligations [Member]
Other Commitments [Line Items]
Guarantees related to rent obligations					1,900,000
Indemnification [Member]
Other Commitments [Line Items]
Accrual for indemnification provisions					0
Israel [Member] | Guarantee Obligations [Member]
Other Commitments [Line Items]
Guarantees related to rent obligations					400,000
TVN [Member] | Guarantee Obligations [Member]
Other Commitments [Line Items]
Guarantees related to rent obligations					1,300,000
TVN [Member]
Other Commitments [Line Items]
Business Combination, Contingent Consideration, Liability, Current						$ 8,000,000
TVN's 2015 revenue, difference as converted from euros to US dollars [Member] | TVN [Member]
Other Commitments [Line Items]
Business Combination, Contingent Consideration, Liability		$ 75,000,000
TVN's 2015 revenue, difference as converted from euros to US dollars [Member] | Maximum [Member] | TVN [Member]
Other Commitments [Line Items]
Business Combination, Contingent Consideration, Liability		83,300,000					€ 76
TVN's 2015 backlog [Member] | TVN [Member]
Other Commitments [Line Items]
Business Combination, Contingent Consideration, Liability					2,500,000
TVN's 2015 backlog [Member] | Maximum [Member] | TVN [Member]
Other Commitments [Line Items]
Business Combination, Contingent Consideration, Liability		$ 5,000,000
Cash Earnout [Member] | TVN [Member]
Other Commitments [Line Items]
Other Payments to Acquire Businesses					$ 3,500,000
[1]	The TVN acquisition is subject to post-closing adjustments as set forth in the TVN Purchase Agreement to be determined within 90 days from the acquisition date in amounts capped to (i) the difference between €76 million (approximately $83.3 million as converted from euros into U.S. dollars using an agreed upon average exchange rate) and $75 million, with respect to an adjustment based on TVN’s 2015 revenue, and (ii) up to $5 million with respect to an adjustment based on TVN’s 2015 backlog that ships during the first half of 2016. During the second quarter of 2016, the Company paid $3.5 million upon the finalization of the revenue and working capital adjustments. The remaining backlog adjustment amount has been finalized at $2.5 million and will be paid in the third quarter of 2016.

Stockholders' Equity - Componen

Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015	Dec. 31, 2015
Equity [Abstract]
Foreign currency translation adjustments	$ (3,311)		$ (3,311)		$ (2,634)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	12		12		(246)
Unrealized gain on investments	(55)		(55)		(1,538)
Accumulated Other Comprehensive Loss	(3,354)		(3,354)		$ (4,418)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	(2,611)	$ 582	(677)	$ (402)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(165)	516	158	332
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	(49)	460	30	945
Other Comprehensive Income (Loss), before Reclassifications, before Tax			(489)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax			0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	22	(138)	100	(187)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax	$ 0	$ 0	1,476	$ 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax			1,576
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax			0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax			0
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax			(23)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent			$ (23)

Stockholders' Equity - Reclassi

Stockholders' Equity - Reclassification from AOCI to Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	$ (22)		$ (100)
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion		$ 138		$ 187
Cost of Sales [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	(3)		(13)
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion		19		26
Operating Expense [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	$ (19)		$ (87)
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion		$ 119		$ 161

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015	May 14, 2014	Apr. 24, 2012
Stockholders' Equity Note [Abstract]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax	$ 0	$ 0	$ 1,476	$ 0
Authorized stock repurchase value					$ 300,000	$ 25,000
Payments for Repurchase of Common Stock			0	$ 12,171
Remaining authorized repurchase amount	$ 45,700		$ 45,700

Uncategorized Items - hlit-2016

Label	Element	Value
Payments to Acquire Businesses, Net of Cash Acquired	us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	$ 0