iRobot (IRBT) 10-Q 1 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 29, 2019	Jul. 27, 2019
Entity Information [Line Items]
Document Transition Report	false
Document Quarterly Report	true
Title of 12(b) Security	Common Stock, $0.01 par value
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0259335
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 29, 2019
Entity File Number	001-36414
Entity Address, Address Line One	8 Crosby Drive
Entity Address, City or Town	Bedford
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01730
City Area Code	781
Local Phone Number	430-3000
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	IRBT
Entity Registrant Name	iROBOT CORPORATION
Entity Central Index Key	0001159167
Current Fiscal Year End Date	--12-28
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		28,123,937
Security Exchange Name	NASDAQ

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 29, 2019	Dec. 29, 2018
Current assets:
Cash and cash equivalents	$ 132,795	$ 130,373
Short term investments	23,984	31,605
Accounts receivable, net	90,401	162,166
Inventory	192,010	164,633
Other current assets	41,960	25,660
Total current assets	481,150	514,437
Property and equipment, net	71,728	57,026
Operating lease right-of-use assets	50,002	0
Deferred tax assets	33,862	36,979
Goodwill	120,538	118,896
Intangible assets, net	18,636	24,273
Other assets	25,099	15,350
Total assets	801,015	766,961
Current liabilities:
Accounts payable	86,848	136,742
Accrued expenses	63,629	71,259
Deferred revenue and customer advances	2,101	5,756
Total current liabilities	152,578	213,757
Operating lease liabilities	58,068	0
Deferred tax liabilities	2,110	4,005
Other long-term liabilities	8,683	13,877
Total long-term liabilities	68,861	17,882
Total liabilities	221,439	231,639
Commitments and contingencies (Note 11)
Preferred stock, 5,000 shares authorized and none outstanding	0	0
Common stock, $0.01 par value, 100,000 shares authorized; 28,123 and 27,788 shares issued and outstanding, respectively	281	278
Additional paid-in capital	184,663	172,771
Retained earnings	396,748	367,021
Accumulated other comprehensive loss	(2,116)	(4,748)
Total stockholders’ equity	579,576	535,322
Total liabilities and stockholders’ equity	$ 801,015	$ 766,961

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 29, 2019	Dec. 29, 2018
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	28,123,000	27,788,000
Common stock, shares outstanding	28,123,000	27,788,000

Consolidated Statements of Inco

Consolidated Statements of Income Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Revenue	$ 260,172	$ 226,317	$ 497,833	$ 443,385
Cost of product revenue	138,891	103,712	253,929	200,213
Amortization of acquired intangible assets	3,111	4,679	6,188	9,461
Total cost of revenue	142,002	108,391	260,117	209,674
Gross profit	118,170	117,926	237,716	233,711
Research and development	35,650	34,924	70,919	67,869
Selling and marketing	56,409	45,910	95,245	77,239
General and administrative	20,592	23,468	43,499	49,301
Amortization of acquired intangible assets	269	269	540	542
Total operating expenses	112,920	104,571	210,203	194,951
Operating income	5,250	13,355	27,513	38,760
Other income, net	1,533	1,507	2,813	2,026
Income before income taxes	6,783	14,862	30,326	40,786
Income tax (benefit) expense	(424)	4,391	599	9,914
Net income	$ 7,207	$ 10,471	$ 29,727	$ 30,872
Basic	$ 0.26	$ 0.38	$ 1.06	$ 1.11
Diluted	$ 0.25	$ 0.37	$ 1.03	$ 1.08
Basic	28,079	27,615	27,970	27,802
Diluted	28,763	28,337	28,779	28,658

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Net income	$ 7,207	$ 10,471	$ 29,727	$ 30,872
Other comprehensive income (loss):
Net foreign currency translation adjustments	1,794	(11,123)	(676)	(5,785)
Net unrealized gains (losses) on cash flow hedges, net of tax	(1,540)	1,619	3,261	(232)
Net (gains) losses on cash flow hedge reclassified into earnings, net of tax	(267)	(169)	(161)	421
Net unrealized gains (losses) on marketable securities, net of tax	95	87	208	(85)
Total comprehensive income	$ 7,289	$ 885	$ 32,359	$ 25,191

Consolidated Statement of Share

Consolidated Statement of Shareholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Beginning Balance, Shares		27,945,000
Beginning balance	$ 470,327	$ 279	$ 190,067	$ 277,989	$ 1,992
Issuance of common stock under employee stock plans (in shares)		67,000
Stock Issued During Period, Value, Stock Options Exercised	2,605	$ 1	2,604
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)		240,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0	$ 2	(2)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	12,377		12,377
Shares Paid for Tax Withholding for Share Based Compensation (in shares)		(51,000)
Stock Withheld to Cover Tax Withholding Requirements Upon Vesting to Restricted Stock Units Amount	(3,532)	$ 0	(3,532)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(5,682)				(5,682)
Adjustments to Additional Paid in Capital Directors Deferred Compensation	34		34
Net income	$ 30,872			30,872
Stock Repurchased and Retired During Period, Shares	(799,000)
Stock Repurchased and Retired During Period, Value	$ (50,000)	$ (8)	(49,992)
Stock Repurchased and Retired During Period, Shares	(798,794)
Stock Repurchased and Retired During Period, Value	$ (50,000)
Beginning Balance, Shares		28,073,000
Beginning balance	496,628	$ 280	191,021	299,430	5,897
Issuance of common stock under employee stock plans (in shares)		56,000
Stock Issued During Period, Value, Stock Options Exercised	2,206	$ 1	2,205
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)		43,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0	$ 1	(1)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	6,431		6,431
Shares Paid for Tax Withholding for Share Based Compensation (in shares)		(1,000)
Stock Withheld to Cover Tax Withholding Requirements Upon Vesting to Restricted Stock Units Amount	(54)	$ 0	(54)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(9,587)				(9,587)
Adjustments to Additional Paid in Capital Directors Deferred Compensation	16		16
Net income	$ 10,471			10,471
Stock Repurchased and Retired During Period, Shares	(769,000)
Stock Repurchased and Retired During Period, Value	$ (48,070)	$ (8)	(48,062)
Beginning Balance, Shares		27,402,000
Beginning balance	458,041	$ 274	151,556	309,901	(3,690)
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 1,040			1,040
Beginning Balance, Shares	27,788,000	27,788,000
Beginning balance	$ 535,322	$ 278	172,771	367,021	(4,748)
Issuance of common stock under employee stock plans (in shares)		116,000
Stock Issued During Period, Value, Stock Options Exercised	4,680	$ 1	4,679
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)		278,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0	$ 3	(3)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	14,458		14,458
Shares Paid for Tax Withholding for Share Based Compensation (in shares)		(59,000)
Stock Withheld to Cover Tax Withholding Requirements Upon Vesting to Restricted Stock Units Amount	(7,277)	$ (1)	(7,276)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	2,632				2,632
Adjustments to Additional Paid in Capital Directors Deferred Compensation	34		34
Net income	29,727			29,727
Beginning Balance, Shares		28,038,000
Beginning balance	562,623	$ 280	175,000	389,541	(2,198)
Issuance of common stock under employee stock plans (in shares)		39,000
Stock Issued During Period, Value, Stock Options Exercised	2,117	$ 0	2,117
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)		47,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0	$ 1	(1)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	7,594		7,594
Shares Paid for Tax Withholding for Share Based Compensation (in shares)		(1,000)
Stock Withheld to Cover Tax Withholding Requirements Upon Vesting to Restricted Stock Units Amount	(65)	$ 0	(65)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	82				82
Adjustments to Additional Paid in Capital Directors Deferred Compensation	18		18
Net income	$ 7,207			7,207
Beginning Balance, Shares	28,123,000	28,123,000
Beginning balance	$ 579,576	$ 281	$ 184,663	$ 396,748	$ (2,116)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 29,727	$ 30,872
Adjustments to reconcile net income to net cash provided by operating activities, net of the effects of acquisition:
Depreciation and amortization	17,905	17,606
Stock-based compensation	14,458	12,377
Deferred income taxes, net	535	(4,208)
Other	3,106	384
Changes in operating assets and liabilities — (use) source
Accounts receivable	67,808	66,085
Inventory	(27,112)	(10,303)
Other current assets	(14,246)	(12,764)
Accounts payable	(52,835)	(46,519)
Accrued expenses and other liabilities	(18,043)	(27,211)
Net cash provided by operating activities	21,303	26,319
Cash flows from investing activities:
Additions of property and equipment	(14,705)	(14,284)
Change in other assets	(4,541)	(1,837)
Proceeds from sale of equity investment	0	629
Cash paid for business acquisition, net of cash acquired	2,817	0
Purchases of investments	0	(6,438)
Sales and maturities of investments	5,880	7,000
Net cash used in investing activities	(16,183)	(14,930)
Cash flows from financing activities:
Proceeds from employee stock plans	4,680	2,605
Income tax withholding payment associated with restricted stock vesting	(7,277)	(3,532)
Stock repurchases	0	50,000
Net cash used in financing activities	(2,597)	(50,927)
Effect of exchange rate changes on cash and cash equivalents	(101)	(314)
Net increase (decrease) in cash and cash equivalents	2,422	(39,852)
Cash and cash equivalents, at beginning of period	130,373	128,635
Cash and cash equivalents, at end of period	132,795	88,783
Supplemental disclosure of cash flow information:
Additions of property and equipment included in accounts payable	$ 4,746	$ 1,537

Description of Business

Description of Business	6 Months Ended
	Jun. 29, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business iRobot Corporation ("iRobot" or the "Company") designs and builds robots that empower people to do more. The Company develops robotic technology and applies it to produce and market consumer robots. The Company’s revenue is primarily generated from product sales through distributor and retail sales channels, as well as its on-line stores.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 29, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying consolidated financial statements include those of iRobot and its subsidiaries, after elimination of all intercompany balances and transactions. iRobot has prepared the accompanying unaudited consolidated financial statements in conformity with accounting principles generally accepted in the United States of America ("GAAP"). In addition, certain prior year amounts have been reclassified to conform to the current year presentation. In the opinion of management, all adjustments necessary to the unaudited interim consolidated financial statements have been made to state fairly the Company's financial position. Interim results are not necessarily indicative of results for the full fiscal year or any future periods. The information included in this Form 10-Q should be read in conjunction with the Company's audited consolidated financial statements and notes thereto included in its Annual Report on Form 10-K for the fiscal year ended December 29, 2018 , filed with the Securities and Exchange Commission on February 14, 2019. The Company operates and reports using a 52-53 week fiscal year ending on the Saturday closest to December 31. Accordingly, the Company’s fiscal quarters end on the Saturday that falls closest to the last day of the third month of each quarter. Use of Estimates The preparation of these financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenues and expenses. These estimates and judgments, include but are not limited to, revenue recognition, including performance obligations, variable consideration and other obligations such as product returns and incentives; warranty costs; valuation of goodwill and acquired intangible assets; valuation of financial instruments; evaluating loss contingencies; accounting for stock-based compensation including performance-based assessments; and accounting for income taxes and related valuation allowances. The Company bases these estimates and judgments on historical experience, market participant fair value considerations, projected future cash flows and various other factors that the Company believes are reasonable under the circumstances. Actual results may differ from the Company’s estimates. Other Assets The Company holds non-marketable equity securities as part of its strategic investments portfolio. The Company classifies its cost method investments as equity securities without readily determinable fair values and measures these investments at cost, less any impairment, adjusted for observable price changes. At June 29, 2019 and December 29, 2018 , other assets consisted primarily of equity securities without readily determinable fair values and an equity method investment totaling $21.6 million and $15.1 million , respectively. Net Income Per Share Basic income per share is calculated using the Company's weighted-average outstanding common shares. Diluted income per share is calculated using the Company's weighted-average outstanding common shares including the dilutive effect of stock awards as determined under the treasury stock method. The following table presents the calculation of both basic and diluted net income per share (in thousands, except per share amounts): Three Months Ended Six Months Ended June 29, 2019 June 30, 2018 June 29, 2019 June 30, 2018 Net income $ 7,207 $ 10,471 $ 29,727 $ 30,872 Weighted-average common shares outstanding 28,079 27,615 27,970 27,802 Dilutive effect of employee stock awards 684 722 809 856 Diluted weighted-average common shares outstanding 28,763 28,337 28,779 28,658 Basic income per share $ 0.26 $ 0.38 $ 1.06 $ 1.11 Diluted income per share $ 0.25 $ 0.37 $ 1.03 $ 1.08 Employee stock awards representing approximately 0.2 million shares of common stock for the three months ended June 29, 2019 and June 30, 2018 , and approximately 0.1 million shares of common stock for the six months ended June 29, 2019 and June 30, 2018 , were excluded from the computation of diluted earnings per share as their effect would have been antidilutive. Recently Adopted Accounting Standards In June 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-07, "Compensation - Stock Compensation: Improvements to Nonemployee Share-Based Payment Accounting (Topic 718)." The amendments in ASU No. 2018-07 expand the scope of Topic 718 to include share-based payments issued to nonemployees for goods or services. The amendments in this ASU are effective for annual periods beginning after December 15, 2018 and interim periods within those annual periods, with early adoption permitted. The Company adopted this standard effective December 30, 2018 which did not have a material impact on the Company's consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU No. 2016-02 "Leases." This ASU and subsequently issued amendments require lessees to recognize the assets and liabilities on their balance sheet for the rights and obligations created by most leases and continue to recognize expenses on their income statements over the lease term. The standard also requires disclosures designed to give financial statement users information on the amount, timing and uncertainty of cash flows arising from leases. In July 2018, the FASB issued ASU No. 2018-11, "Leases (Topic 842): Targeted Improvements," which provides an alternative transition method that entities can elect when adopting the new standard. Under this alternative transition method, a company is permitted to use its effective date as the date of initial application without restating comparative period financial statements. The Company adopted the standard effective December 30, 2018 using the alternative transition method which resulted in the recognition of operating lease right-of-use assets and operating lease liabilities of approximately $52.8 million and $67.3 million, respectively. The Company's consolidated financial statements as of and for the three and six months ended June 29, 2019 are presented under the new standard, while the comparative quarter presented is not adjusted and continues to be reported in accordance with the historical accounting policy. See Note 4, "Leases," for the required disclosures related to the impact of adopting this standard and a discussion of the Company's updated policies related to lease accounting. Recently Issued Accounting Standards In August 2018, the FASB issued ASU No. 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software." The new standard aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). The amendments to this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted. Implementation should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is currently evaluating the impact of the standard on its consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, "Fair Value Measurement: Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement." The amendment modifies disclosure requirements related to fair value measurement. The amendments to this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Implementation on a prospective or retrospective basis varies by specific disclosure requirement. Early adoption is permitted. The standard also allows for early adoption of any removed or modified disclosures upon issuance of this ASU while delaying adoption of the additional disclosures until their effective date. The Company does not believe this amendment will have a material impact on its consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, "Measurement of Credit Losses on Financial Instruments," as clarified in ASU No. 2019-04 and ASU No. 2019-05. The guidance amends the impairment model by requiring entities to use a forward- looking approach based on expected losses rather than incurred losses to estimate credit losses on certain types of financial instruments. This may result in the earlier recognition of allowances for losses. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted. The Company is currently evaluating the impact of the standards on its consolidated financial statements. From time to time, new accounting pronouncements are issued by FASB that are adopted by the Company as of the specified effective date. Unless otherwise discussed, the Company believes that recently issued standards, which are not yet effective, will not have a material impact on the Company’s consolidated financial statements upon adoption.

Revenue Recognition (Notes)

Revenue Recognition (Notes)	6 Months Ended
	Jun. 29, 2019
Revenue Recognition and Deferred Revenue [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue Recognition The Company primarily derives its revenue from product sales. The Company sells products directly to consumers through on-line stores and indirectly through resellers and distributors. Revenue is recognized upon transfer of control of promised products or services to customers, generally as title and risk of loss passes, in an amount that reflects the consideration the Company expects to receive in exchange for those products or services. Taxes collected from customers, which are subsequently remitted to governmental authorities, are excluded from revenue. Shipping and handling expenses are considered fulfillment activities and are expensed as incurred. The Company’s product portfolio includes various consumer robots, many of which are Wi-Fi connected. The consumer robots are generally highly dependent on, and interrelated with, the embedded software and cannot function without the software. As such, the consumer robots are accounted for as a single performance obligation, and the revenue is recognized at a point in time when the control is transferred to distributors, resellers or directly to end customers through on-line stores. For consumer robots with Wi-Fi capability ("connected robots"), each sale represents an arrangement with multiple promises consisting of the robot, an app, cloud services and potential future unspecified software upgrades. The Company has determined that the app, cloud services and potential future unspecified software upgrades represent one promised service to the customer to enhance the functionality and interaction with the robot (referred to collectively as "Cloud Services"). For certain connected robots, the Company has concluded that, on a quantitative and qualitative basis, the Cloud Services do not constitute a material performance obligation and, as such, these services are not considered a separate performance obligation that requires allocation of transaction price. During the third quarter of 2018, the Company launched Roomba i7 and i7+ which brought a new level of intelligence and automation to robotic vacuum cleaners with the ability to learn, map and adapt to a home's floor plan. The Company has concluded that beginning with this launch, the Cloud Services related to these new products are a material performance obligation. For contracts that contain multiple performance obligations, the transaction price is allocated to each performance obligation based on a relative standalone selling price ("SSP"). The SSP reflects the Company's best estimate of what the selling prices of performance obligations would be if they were sold regularly on a standalone basis. Revenue allocated to the robots is recognized at a point in time when control is transferred. Revenue allocated to the Cloud Services is deferred and recognized on a straight-line basis over the estimated period the software upgrades and services are expected to be provided. For contracts with a duration of greater than one year, the transaction price allocated to performance obligations that are unsatisfied as of June 29, 2019 is not material. The Company does not disclose the value of unsatisfied performance obligations for contracts with an original expected duration of one year or less. The Company’s products generally carry a one-year limited warranty that promises customers that delivered products are as specified. The Company does not consider these assurance-type warranties as a separate performance obligation and therefore, the Company accounts for such warranties under ASC 460, "Guarantees." Significant Judgments The Company provides limited rights of returns for direct-to-consumer sales generated through its on-line stores and certain resellers and distributors. In addition, the Company may provide other credits or incentives, including price protection, which are accounted for as variable consideration when estimating the amount of revenue to recognize. Where appropriate, these estimates take into consideration relevant factors such as the Company’s historical experience, current contractual requirements, specific known market events and trends and forecasted customer buying and payment patterns. Overall, these reserves reflect the Company’s best estimates, and the actual amounts of consideration ultimately received may differ from the Company’s estimates. Returns and credits are estimated at contract inception and updated at the end of each reporting period as additional information becomes available and only to the extent that it is probable that a significant reversal of any incremental revenue will not occur. As of June 29, 2019, the Company has reserves for product returns of $44.5 million and other credits and incentives of $69.7 million . As of December 29, 2018 , the Company had reserves for product returns of $53.9 million and other credits and incentives of $97.7 million . Revenue recognized during the three months ended June 29, 2019 and June 30, 2018 related to performance obligations satisfied in a prior period was not material. Disaggregation of Revenue The following table provides information about disaggregated revenue by geographical region (in thousands): Three Months Ended Six Months Ended June 29, 2019 June 30, 2018 June 29, 2019 June 30, 2018 United States $ 124,472 $ 111,526 $ 238,537 $ 218,388 EMEA 82,893 70,123 157,462 139,710 Other 52,807 44,668 101,834 85,287 Total revenue $ 260,172 $ 226,317 $ 497,833 $ 443,385 Contract Balances The following table provides information about receivables and contract liabilities from contracts with customers (in thousands): June 29, 2019 December 29, 2018 Accounts receivable, net $ 90,401 $ 162,166 Contract liabilities 3,075 5,756 The Company invoices customers based upon contractual billing schedules, and accounts receivable are recorded when the right to consideration becomes unconditional. Contract liabilities primarily relate to prepayments received from customers in advance of product shipments. The change in the opening and closing balances of the Company’s contract assets and contract liabilities primarily results from the timing difference between the Company’s performance and the customer’s payment. During the three months ended June 29, 2019 and June 30, 2018 , the Company recognized $5.3 million and $6.3 million , respectively, of the contract liability balance as revenue upon transfer of the products to customers. During the six months ended June 29, 2019 and June 30, 2018 , the Company recognized $5.8 million and $6.7 million , respectively, of the contract liability balance as revenue upon transfer of the products to customers. The Company does not assess whether a prepayment received represents a significant financing component as the period between when the payment is received and the transfer of the products to the customer is generally one year or less.

Leases (Notes)

Leases (Notes)	6 Months Ended
	Jun. 29, 2019
Leases [Abstract]
Lessee, Operating Leases [Text Block]	Leases The Company's leasing arrangements primarily consist of operating leases for its facilities which include corporate, sales and research and development offices. For leases with terms greater than 12 months, the Company records the related right-of-use asset and lease obligation at the present value of lease payments over the term. The Company's leases typically include rental escalation clauses, renewal options and/or termination options that are factored into the determination of lease payments when appropriate. The Company does not separate lease and nonlease components of contracts and excludes all variable lease payments from the measurement of right-of-use assets and lease liabilities. The Company's variable lease payments generally include usage based nonlease components. The Company's lease agreements do not contain any residual value guarantees or restrictive covenants. Leases with an initial term of 12 months or less are not recorded on the balance sheet; lease expense is recognized on a straight-line basis over the lease term. The Company's existing leases do not provide a readily determinable implicit rate. Therefore, the Company estimates its incremental borrowing rate to discount the lease payments based on information available at December 30, 2018 (date of initial application) or the lease commencement date for existing leases upon adoption or new leases post adoption, respectively. At June 29, 2019, the Company's weighted average discount rate was 3.61% , while the weighted average remaining lease term was 9.58 years. The components of lease expense were as follows (in thousands): Three Months Ended Six Months Ended June 29, 2019 Operating lease cost $ 1,969 $ 3,939 Variable lease cost 1,316 2,136 Total lease cost $ 3,285 $ 6,075 Supplemental cash flow information related to leases was as follows (in thousands): Three Months Ended Six Months Ended June 29, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 2,865 $ 4,881 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ — $ 52,767 Maturities of operating lease liabilities were as follows as of June 29, 2019 (in thousands): Operating leases Remainder of 2019 $ 3,435 2020 8,543 2021 8,255 2022 7,580 2023 7,127 Thereafter 41,198 Total minimum lease payments $ 76,138 Less: imputed interest 12,548 Present value of future minimum lease payments $ 63,590 Less: current portion of operating lease liabilities (Note 7) 5,522 Long-term lease liabilities $ 58,068 Financial Statement Impact of Adopting ASC 842 The Company adopted ASC 842 effective December 30, 2018 using the alternative transition method. Under this alternative transition method, a company is permitted to use its effective date as the date of initial application without restating comparative period financial statements. The Company elected the package of practical expedients permitted under the transition guidance, which allowed the Company to carryforward its historical assessments of (1) whether contracts are or contain leases, (2) lease classification and (3) initial direct costs. In addition, the Company elected the practical expedient to use hindsight in determining lease term. The adoption of the new standard resulted in the recognition of right-of-use assets and lease liabilities of approximately $52.8 million and $67.3 million , respectively. The standard did not materially impact the Company's consolidated income or cash flows.

Inventory

Inventory	6 Months Ended
	Jun. 29, 2019
Inventory Disclosure [Abstract]
Inventory	Inventory Inventory consists of the following (in thousands): June 29, 2019 December 29, 2018 Raw materials $ 2,922 $ 2,992 Finished goods 189,088 161,641 $ 192,010 $ 164,633

Goodwill, Other Intangible Asse

Goodwill, Other Intangible Assets and Other Assets	6 Months Ended
	Jun. 29, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Other Intangible Assets and Other Assets	Goodwill and Other Intangible Assets The following table summarizes the activity in the carrying amount of goodwill for the six months ended June 29, 2019 (in thousands): Balance as of December 29, 2018 $ 118,896 Acquisition 2,050 Effect of foreign currency translation (408 ) Balance as of June 29, 2019 $ 120,538 Intangible assets at June 29, 2019 and December 29, 2018 consisted of the following (in thousands): June 29, 2019 December 29, 2018 Cost Accumulated Amortization Net Cost Accumulated Amortization Net Completed technology $ 28,100 $ 23,396 $ 4,704 $ 26,900 $ 21,607 $ 5,293 Tradename 100 100 — 100 100 — Customer relationships 11,255 1,859 9,396 11,291 1,365 9,926 Reacquired distribution rights 32,347 27,921 4,426 32,499 23,598 8,901 Non-competition agreements 262 152 110 263 110 153 Total $ 72,064 $ 53,428 $ 18,636 $ 71,053 $ 46,780 $ 24,273 Amortization expense related to acquired intangible assets was $3.4 million and $4.9 million for the three months ended June 29, 2019 and June 30, 2018 , respectively. Amortization expense related to acquired intangible assets was $6.7 million and $10.0 million for the six months ended June 29, 2019 and June 30, 2018 , respectively. The estimated future amortization expense related to current intangible assets in each of the five succeeding fiscal years is expected to be as follows (in thousands): Cost of Revenue Operating Expenses Total Remainder of 2019 $ 5,635 $ 497 $ 6,132 2020 1,140 1,016 2,156 2021 1,140 792 1,932 2022 915 792 1,707 2023 240 792 1,032 Thereafter 60 5,617 5,677 Total $ 9,130 $ 9,506 $ 18,636

Accrued Expenses

Accrued Expenses	6 Months Ended
	Jun. 29, 2019
Accrued Liabilities, Current [Abstract]
Accrued Expenses	Accrued Expenses Accrued expenses consisted of the following at (in thousands): June 29, 2019 December 29, 2018 Accrued other compensation $ 12,241 $ 10,518 Accrued warranty 11,970 11,964 Accrued direct fulfillment costs 9,543 5,372 Accrued bonus 6,914 21,226 Current portion of operating lease liabilities 5,522 — Accrued sales and other indirect taxes payable 4,931 11,397 Accrued income taxes 2,547 1,936 Accrued accounting fees 2,020 2,052 Accrued other 7,941 6,794 $ 63,629 $ 71,259

Derivative Instruments (Notes)

Derivative Instruments (Notes)	6 Months Ended
	Jun. 29, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	Derivative Instruments The Company operates internationally and, in the normal course of business, is exposed to fluctuations in foreign currency exchange rates. The foreign currency exposures typically arise from transactions denominated in currencies other than the functional currency of the Company's operations, primarily the Japanese Yen, Canadian Dollar, British Pound and the Euro. The Company uses derivative instruments that are designated in cash flow hedge relationships to reduce or eliminate the effects of foreign exchange rate changes on sales and purchases. These contracts typically have maturities of thirty-seven months or less. At June 29, 2019 and December 29, 2018 , the Company had outstanding cash flow hedges with a total notional value of $389.9 million and $366.7 million , respectively. The Company also enters into economic hedges that are not designated as hedges from an accounting standpoint to reduce or eliminate the effects of foreign exchange rate changes typically related to short term trade receivables and payables. These contracts typically have maturities of ten months or less. At June 29, 2019 and December 29, 2018 , the Company had outstanding economic hedges with a total notional value of $48.0 million and $56.0 million , respectively. The fair values of derivative instruments are as follows (in thousands): Fair Value Classification June 29, 2019 December 29, 2018 Derivatives not designated as hedging instruments: Foreign currency forward contracts Other current assets $ 480 $ 551 Foreign currency forward contracts Accrued expenses 598 — Derivatives designated as cash flow hedges: Foreign currency forward contracts Other current assets $ 1,201 $ 53 Foreign currency forward contracts Other assets 3,454 172 Foreign currency forward contracts Accrued expenses 1,102 335 Foreign currency forward contracts Long-term liabilities 833 795 Gains (losses) associated with derivative instruments not designated as hedging instruments are as follows (in thousands): Three Months Ended Six Months Ended Classification June 29, 2019 June 30, 2018 June 29, 2019 June 30, 2018 Gain (loss) recognized in income Other income, net $ (1,085 ) $ 1,707 $ (652 ) $ 538 The following tables reflect the effect of derivatives designated as cash flow hedging for the three and six months ended June 29, 2019 and June 30, 2018 (in thousands): Gain (loss) recognized in OCI on Derivative (1) Three Months Ended Six Months Ended June 29, 2019 June 30, 2018 June 29, 2019 June 30, 2018 Foreign currency forward contracts $ (2,054 ) $ 2,154 $ 4,350 $ (560 ) (1) The amount represents the change in fair value of derivative contracts due to changes in spot rates. Gain (loss) recognized in earnings on cash flow hedging instruments Three Months Ended June 29, 2019 June 30, 2018 Revenue Cost of revenue Revenue Cost of revenue Consolidated statements of income in which the effects of cash flow hedging instruments are recorded $ 260,172 $ 142,002 $ 226,317 $ 108,391 Gain (loss) on cash flow hedging relationships: Foreign currency forward contracts: Amount of gain (loss) reclassified from AOCI into earnings $ 359 $ — $ (113 ) $ 370 Gain (loss) recognized in earnings on cash flow hedging instruments Six Months Ended June 29, 2019 June 30, 2018 Revenue Cost of revenue Revenue Cost of revenue Consolidated statements of income in which the effects of cash flow hedging instruments are recorded $ 497,833 $ 260,117 $ 443,385 $ 209,674 Gain (loss) on cash flow hedging relationships: Foreign currency forward contracts: Amount of gain (loss) reclassified from AOCI into earnings $ 214 $ — $ (279 ) $ (386 )

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	6 Months Ended
	Jun. 29, 2019
Fair Value Footnote [Abstract]
Fair Value Disclosures [Text Block]	Fair Value Measurements The Company’s financial assets and liabilities measured at fair value on a recurring basis at June 29, 2019, were as follows (in thousands): Fair Value Measurements as of Level 1 Level 2 (1) Level 3 (2) Assets: Corporate and government bonds, $24,018 at cost (3) $ — $ 23,984 $ — Derivative instruments (Note 8) — 5,135 — Total assets measured at fair value $ — $ 29,119 $ — Liabilities: Derivative instruments (Note 8) $ — $ 2,533 $ — Total liabilities measured at fair value $ — $ 2,533 $ — The Company’s financial assets and liabilities measured at fair value on a recurring basis at December 29, 2018 , were as follows (in thousands): Fair Value Measurements as of Level 1 Level 2 (1) Level 3 (2) Assets: Money market funds $ 3,730 $ — $ — Corporate and government bonds, $30,035 at cost — 29,605 — Convertible note — — 2,000 Derivative instruments (Note 8) — 776 — Total assets measured at fair value $ 3,730 $ 30,381 $ 2,000 Liabilities: Derivative instruments (Note 8) $ — $ 1,130 $ — Total liabilities measured at fair value $ — $ 1,130 $ — (1) Level 2 fair value estimates are based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. (2) Level 3 fair value estimates are based on inputs that are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques, including option pricing and discounted cash flow models. Unobservable inputs used in the models are significant to the fair values of the assets and liabilities. (3) As of June 29, 2019, the Company’s investments had maturity dates ranging from August 2019 to March 2021. The following table provides a summary of changes in fair value of our Level 3 investment for the six months ended June 29, 2019 (in thousands): Balance as of December 29, 2018 $ 2,000 Conversion of convertible note (2,000 ) Balance as of June 29, 2019 $ —

Stockholders Equity (Notes)

Stockholders Equity (Notes)	6 Months Ended
	Jun. 29, 2019
Equity [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	Stockholders' Equity Share Repurchase Activity On February 27, 2018, the Company's board of directors approved a stock repurchase program authorizing up to $50.0 million in share repurchases. This share repurchase program commenced on March 28, 2018 with an expiration date of December 28, 2018. As of June 30, 2018, the Company completed the repurchase program and repurchased 798,794 shares of common stock totaling $50.0 million .

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 29, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings From time to time and in the ordinary course of business, the Company is subject to various claims, charges and litigation. The outcome of litigation cannot be predicted with certainty and some lawsuits, claims or proceedings may be disposed of unfavorably to us, which could materially affect our financial condition or results of operations. Outstanding Purchase Orders At June 29, 2019 , the Company had outstanding purchase orders aggregating approximately $213.0 million . These purchase orders, the majority of which are with contract manufacturers for the purchase of inventory in the normal course of business, are for manufacturing and non-manufacturing related goods and services, and are generally cancelable without penalty. In circumstances where the Company determines that it has financial exposure associated with any of these commitments, the Company records a liability in the period in which that exposure is identified. Guarantees and Indemnification Obligations The Company enters into standard indemnification agreements in the ordinary course of business. Pursuant to these agreements, the Company indemnifies and agrees to reimburse the indemnified party for losses incurred by the indemnified party, generally the Company’s customers, in connection with any patent, copyright, trade secret or other proprietary right infringement claim by any third party. The term of these indemnification agreements is generally perpetual any time after execution of the agreement. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited. The Company has never incurred costs to defend lawsuits or settle claims related to these indemnification agreements. As a result, the Company believes the estimated fair value of these agreements is minimal. Accordingly, the Company has no liabilities recorded for these agreements as of June 29, 2019 and December 29, 2018 , respectively. Warranty The Company provides warranties on most products and has established a reserve for warranty obligations based on estimated warranty costs. The reserve is included as part of accrued expenses (Note 7) in the accompanying consolidated balance sheets. Activity related to the warranty accrual was as follows (in thousands): Three Months Ended Six Months Ended June 29, 2019 June 30, 2018 June 29, 2019 June 30, 2018 Balance at beginning of period $ 11,628 $ 11,833 $ 11,964 $ 11,264 Provision 2,682 2,193 5,333 4,628 Warranty usage (2,340 ) (2,793 ) (5,327 ) (4,659 ) Balance at end of period $ 11,970 $ 11,233 $ 11,970 $ 11,233

Income Taxes (Notes)

Income Taxes (Notes)	6 Months Ended
	Jun. 29, 2019
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes The Company’s effective income tax rate for the three months ended June 29, 2019 and June 30, 2018 , was (6.3)% and 29.6% , respectively. The decrease in the effective income tax rate was primarily due to increased tax benefits related to excess stock-based compensation and the recognition of a discrete tax benefit upon the effective settlement of a foreign tax audit in the three months ended June 29, 2019. In addition, the Company recorded a discrete charge for estimated taxes associated with a restructuring of the EMEA business in the three months ended June 30, 2018. The Company's effective income tax rate of (6.3)% for the three months ended June 29, 2019 differed from the federal statutory tax rate of 21% primarily due to the recognition of tax benefits related to excess stock-based compensation and the recognition of a discrete tax benefit upon the effective settlement of a foreign tax audit. The Company’s effective income tax rate for the six months ended June 29, 2019 and June 30, 2018, was 2.0% and 24.3% , respectively. The decrease in the effective income tax rate was primarily due to increased tax benefits related to excess stock-based compensation and a decrease in foreign taxes related to a discrete charge for estimated taxes associated with a restructuring of the EMEA business in the three months ended June 30, 2018. The Company's effective income tax rate of 2.0% for the six months ended June 29, 2019 differed from the federal statutory tax rate of 21% primarily due to the recognition of tax benefits related to excess stock-based compensation.

Industry Segment, Geographic In

Industry Segment, Geographic Information and Significant Customers	6 Months Ended
	Jun. 29, 2019
Segment Reporting [Abstract]
Industry Segment, Geographic Information and Significant Customers	Industry Segment, Geographic Information and Significant Customers The Company operates as one operating segment. The Company's consumer robots products are offered to consumers through distributor and retail sales channels, as well as its on-line stores. Significant Customers For the three months ended June 29, 2019 and June 30, 2018 , the Company generated 28.0% and 23.8% of total revenue, respectively, from one of its retailers (Amazon). For the six months ended June 29, 2019 and June 30, 2018 , the Company generated 22.3% and 17.7%

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 29, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements include those of iRobot and its subsidiaries, after elimination of all intercompany balances and transactions. iRobot has prepared the accompanying unaudited consolidated financial statements in conformity with accounting principles generally accepted in the United States of America ("GAAP"). In addition, certain prior year amounts have been reclassified to conform to the current year presentation. In the opinion of management, all adjustments necessary to the unaudited interim consolidated financial statements have been made to state fairly the Company's financial position. Interim results are not necessarily indicative of results for the full fiscal year or any future periods. The information included in this Form 10-Q should be read in conjunction with the Company's audited consolidated financial statements and notes thereto included in its Annual Report on Form 10-K for the fiscal year ended December 29, 2018 , filed with the Securities and Exchange Commission on February 14, 2019. The Company operates and reports using a 52-53 week fiscal year ending on the Saturday closest to December 31. Accordingly, the Company’s fiscal quarters end on the Saturday that falls closest to the last day of the third month of each quarter.
Use of Estimates	Use of Estimates The preparation of these financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenues and expenses. These estimates and judgments, include but are not limited to, revenue recognition, including performance obligations, variable consideration and other obligations such as product returns and incentives; warranty costs; valuation of goodwill and acquired intangible assets; valuation of financial instruments; evaluating loss contingencies; accounting for stock-based compensation including performance-based assessments; and accounting for income taxes and related valuation allowances. The Company bases these estimates and judgments on historical experience, market participant fair value considerations, projected future cash flows and various other factors that the Company believes are reasonable under the circumstances. Actual results may differ from the Company’s estimates.
Investment, Policy [Policy Text Block]	Other Assets The Company holds non-marketable equity securities as part of its strategic investments portfolio. The Company classifies its cost method investments as equity securities without readily determinable fair values and measures these investments at cost, less any impairment, adjusted for observable price changes. At June 29, 2019 and December 29, 2018 , other assets consisted primarily of equity securities without readily determinable fair values and an equity method investment totaling $21.6 million and $15.1 million , respectively.
Net Income Per Share	Net Income Per Share Basic income per share is calculated using the Company's weighted-average outstanding common shares. Diluted income per share is calculated using the Company's weighted-average outstanding common shares including the dilutive effect of stock awards as determined under the treasury stock method. The following table presents the calculation of both basic and diluted net income per share (in thousands, except per share amounts): Three Months Ended Six Months Ended June 29, 2019 June 30, 2018 June 29, 2019 June 30, 2018 Net income $ 7,207 $ 10,471 $ 29,727 $ 30,872 Weighted-average common shares outstanding 28,079 27,615 27,970 27,802 Dilutive effect of employee stock awards 684 722 809 856 Diluted weighted-average common shares outstanding 28,763 28,337 28,779 28,658 Basic income per share $ 0.26 $ 0.38 $ 1.06 $ 1.11 Diluted income per share $ 0.25 $ 0.37 $ 1.03 $ 1.08 Employee stock awards representing approximately 0.2 million shares of common stock for the three months ended June 29, 2019 and June 30, 2018 , and approximately 0.1 million shares of common stock for the six months ended June 29, 2019 and June 30, 2018
Recent Accounting Pronouncements	Recently Adopted Accounting Standards In June 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-07, "Compensation - Stock Compensation: Improvements to Nonemployee Share-Based Payment Accounting (Topic 718)." The amendments in ASU No. 2018-07 expand the scope of Topic 718 to include share-based payments issued to nonemployees for goods or services. The amendments in this ASU are effective for annual periods beginning after December 15, 2018 and interim periods within those annual periods, with early adoption permitted. The Company adopted this standard effective December 30, 2018 which did not have a material impact on the Company's consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU No. 2016-02 "Leases." This ASU and subsequently issued amendments require lessees to recognize the assets and liabilities on their balance sheet for the rights and obligations created by most leases and continue to recognize expenses on their income statements over the lease term. The standard also requires disclosures designed to give financial statement users information on the amount, timing and uncertainty of cash flows arising from leases. In July 2018, the FASB issued ASU No. 2018-11, "Leases (Topic 842): Targeted Improvements," which provides an alternative transition method that entities can elect when adopting the new standard. Under this alternative transition method, a company is permitted to use its effective date as the date of initial application without restating comparative period financial statements. The Company adopted the standard effective December 30, 2018 using the alternative transition method which resulted in the recognition of operating lease right-of-use assets and operating lease liabilities of approximately $52.8 million and $67.3 million, respectively. The Company's consolidated financial statements as of and for the three and six months ended June 29, 2019 are presented under the new standard, while the comparative quarter presented is not adjusted and continues to be reported in accordance with the historical accounting policy. See Note 4, "Leases," for the required disclosures related to the impact of adopting this standard and a discussion of the Company's updated policies related to lease accounting. Recently Issued Accounting Standards In August 2018, the FASB issued ASU No. 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software." The new standard aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). The amendments to this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted. Implementation should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is currently evaluating the impact of the standard on its consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, "Fair Value Measurement: Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement." The amendment modifies disclosure requirements related to fair value measurement. The amendments to this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Implementation on a prospective or retrospective basis varies by specific disclosure requirement. Early adoption is permitted. The standard also allows for early adoption of any removed or modified disclosures upon issuance of this ASU while delaying adoption of the additional disclosures until their effective date. The Company does not believe this amendment will have a material impact on its consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, "Measurement of Credit Losses on Financial Instruments," as clarified in ASU No. 2019-04 and ASU No. 2019-05. The guidance amends the impairment model by requiring entities to use a forward- looking approach based on expected losses rather than incurred losses to estimate credit losses on certain types of financial instruments. This may result in the earlier recognition of allowances for losses. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted. The Company is currently evaluating the impact of the standards on its consolidated financial statements. From time to time, new accounting pronouncements are issued by FASB that are adopted by the Company as of the specified effective date. Unless otherwise discussed, the Company believes that recently issued standards, which are not yet effective, will not have a material impact on the Company’s consolidated financial statements upon adoption.

Revenue Recognition Disaggregat

Revenue Recognition Disaggregation of Revenue (Tables)	6 Months Ended
	Jun. 29, 2019
Revenue Recognition and Deferred Revenue [Abstract]
Disaggregation of Revenue [Table Text Block]	Disaggregation of Revenue The following table provides information about disaggregated revenue by geographical region (in thousands): Three Months Ended Six Months Ended June 29, 2019 June 30, 2018 June 29, 2019 June 30, 2018 United States $ 124,472 $ 111,526 $ 238,537 $ 218,388 EMEA 82,893 70,123 157,462 139,710 Other 52,807 44,668 101,834 85,287 Total revenue $ 260,172 $ 226,317 $ 497,833 $ 443,385

Revenue Recognition Contract Ba

Revenue Recognition Contract Balances (Tables)	6 Months Ended
	Jun. 29, 2019
Revenue Recognition and Deferred Revenue [Abstract]
Contract with Customer, Asset and Liability [Table Text Block]	Contract Balances The following table provides information about receivables and contract liabilities from contracts with customers (in thousands): June 29, 2019 December 29, 2018 Accounts receivable, net $ 90,401 $ 162,166 Contract liabilities 3,075 5,756 The Company invoices customers based upon contractual billing schedules, and accounts receivable are recorded when the right to consideration becomes unconditional. Contract liabilities primarily relate to prepayments received from customers in advance of product shipments. The change in the opening and closing balances of the Company’s contract assets and contract liabilities primarily results from the timing difference between the Company’s performance and the customer’s payment. During the three months ended June 29, 2019 and June 30, 2018 , the Company recognized $5.3 million and $6.3 million , respectively, of the contract liability balance as revenue upon transfer of the products to customers. During the six months ended June 29, 2019 and June 30, 2018 , the Company recognized $5.8 million and $6.7 million , respectively, of the contract liability balance as revenue upon transfer of the products to customers. The Company does not assess whether a prepayment received represents a significant financing component as the period between when the payment is received and the transfer of the products to the customer is generally one year or less.

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 29, 2019
Operating Lease Cost [Abstract]
Lease, Cost [Table Text Block]	The components of lease expense were as follows (in thousands): Three Months Ended Six Months Ended June 29, 2019 Operating lease cost $ 1,969 $ 3,939 Variable lease cost 1,316 2,136 Total lease cost $ 3,285 $ 6,075
ScheduleOfLeasesSupplementalCashFlow [Table Text Block]	Supplemental cash flow information related to leases was as follows (in thousands): Three Months Ended Six Months Ended June 29, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 2,865 $ 4,881 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ — $ 52,767
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Maturities of operating lease liabilities were as follows as of June 29, 2019 (in thousands): Operating leases Remainder of 2019 $ 3,435 2020 8,543 2021 8,255 2022 7,580 2023 7,127 Thereafter 41,198 Total minimum lease payments $ 76,138 Less: imputed interest 12,548 Present value of future minimum lease payments $ 63,590 Less: current portion of operating lease liabilities (Note 7) 5,522 Long-term lease liabilities $ 58,068

Inventory (Tables)

Inventory (Tables)	6 Months Ended
	Jun. 29, 2019
Inventory Disclosure [Abstract]
Components of Inventory	Inventory Inventory consists of the following (in thousands): June 29, 2019 December 29, 2018 Raw materials $ 2,922 $ 2,992 Finished goods 189,088 161,641 $ 192,010 $ 164,633

Goodwill, Other Intangible As_2

Goodwill, Other Intangible Assets and Other Assets (Tables)	6 Months Ended
	Jun. 29, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	The following table summarizes the activity in the carrying amount of goodwill for the six months ended June 29, 2019 (in thousands): Balance as of December 29, 2018 $ 118,896 Acquisition 2,050 Effect of foreign currency translation (408 ) Balance as of June 29, 2019 $ 120,538
Other Intangible Assets	Intangible assets at June 29, 2019 and December 29, 2018 consisted of the following (in thousands): June 29, 2019 December 29, 2018 Cost Accumulated Amortization Net Cost Accumulated Amortization Net Completed technology $ 28,100 $ 23,396 $ 4,704 $ 26,900 $ 21,607 $ 5,293 Tradename 100 100 — 100 100 — Customer relationships 11,255 1,859 9,396 11,291 1,365 9,926 Reacquired distribution rights 32,347 27,921 4,426 32,499 23,598 8,901 Non-competition agreements 262 152 110 263 110 153 Total $ 72,064 $ 53,428 $ 18,636 $ 71,053 $ 46,780 $ 24,273
Estimated Future Amortization Expense Related to Current Intangible Assets	The estimated future amortization expense related to current intangible assets in each of the five succeeding fiscal years is expected to be as follows (in thousands): Cost of Revenue Operating Expenses Total Remainder of 2019 $ 5,635 $ 497 $ 6,132 2020 1,140 1,016 2,156 2021 1,140 792 1,932 2022 915 792 1,707 2023 240 792 1,032 Thereafter 60 5,617 5,677 Total $ 9,130 $ 9,506 $ 18,636

Accrued Expenses (Tables)

Accrued Expenses (Tables)	6 Months Ended
	Jun. 29, 2019
Accrued Liabilities, Current [Abstract]
Components of Accrued Expenses	June 29, 2019 December 29, 2018 Accrued other compensation $ 12,241 $ 10,518 Accrued warranty 11,970 11,964 Accrued direct fulfillment costs 9,543 5,372 Accrued bonus 6,914 21,226 Current portion of operating lease liabilities 5,522 — Accrued sales and other indirect taxes payable 4,931 11,397 Accrued income taxes 2,547 1,936 Accrued accounting fees 2,020 2,052 Accrued other 7,941 6,794 $ 63,629 $ 71,259

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 29, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) [Table Text Block]	Gains (losses) associated with derivative instruments not designated as hedging instruments are as follows (in thousands): Three Months Ended Six Months Ended Classification June 29, 2019 June 30, 2018 June 29, 2019 June 30, 2018 Gain (loss) recognized in income Other income, net $ (1,085 ) $ 1,707 $ (652 ) $ 538 The following tables reflect the effect of derivatives designated as cash flow hedging for the three and six months ended June 29, 2019 and June 30, 2018 (in thousands): Gain (loss) recognized in OCI on Derivative (1) Three Months Ended Six Months Ended June 29, 2019 June 30, 2018 June 29, 2019 June 30, 2018 Foreign currency forward contracts $ (2,054 ) $ 2,154 $ 4,350 $ (560 ) (1) The amount represents the change in fair value of derivative contracts due to changes in spot rates. Gain (loss) recognized in earnings on cash flow hedging instruments Three Months Ended June 29, 2019 June 30, 2018 Revenue Cost of revenue Revenue Cost of revenue Consolidated statements of income in which the effects of cash flow hedging instruments are recorded $ 260,172 $ 142,002 $ 226,317 $ 108,391 Gain (loss) on cash flow hedging relationships: Foreign currency forward contracts: Amount of gain (loss) reclassified from AOCI into earnings $ 359 $ — $ (113 ) $ 370 Gain (loss) recognized in earnings on cash flow hedging instruments Six Months Ended June 29, 2019 June 30, 2018 Revenue Cost of revenue Revenue Cost of revenue Consolidated statements of income in which the effects of cash flow hedging instruments are recorded $ 497,833 $ 260,117 $ 443,385 $ 209,674 Gain (loss) on cash flow hedging relationships: Foreign currency forward contracts: Amount of gain (loss) reclassified from AOCI into earnings $ 214 $ — $ (279 ) $ (386 )

Derivative Instruments Schedule

Derivative Instruments Schedule of Derivative Instruments (Tables)	6 Months Ended
	Jun. 29, 2019
Derivative [Line Items]
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following tables reflect the effect of derivatives designated as cash flow hedging for the three and six months ended June 29, 2019 and June 30, 2018 (in thousands): Gain (loss) recognized in OCI on Derivative (1) Three Months Ended Six Months Ended June 29, 2019 June 30, 2018 June 29, 2019 June 30, 2018 Foreign currency forward contracts $ (2,054 ) $ 2,154 $ 4,350 $ (560 ) (1) The amount represents the change in fair value of derivative contracts due to changes in spot rates.
Schedule of Derivative Instruments [Table Text Block]	The fair values of derivative instruments are as follows (in thousands): Fair Value Classification June 29, 2019 December 29, 2018 Derivatives not designated as hedging instruments: Foreign currency forward contracts Other current assets $ 480 $ 551 Foreign currency forward contracts Accrued expenses 598 — Derivatives designated as cash flow hedges: Foreign currency forward contracts Other current assets $ 1,201 $ 53 Foreign currency forward contracts Other assets 3,454 172 Foreign currency forward contracts Accrued expenses 1,102 335 Foreign currency forward contracts Long-term liabilities 833 795

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 29, 2019
Commitments and Contingencies Disclosure [Abstract]
Activity Related to the Warranty Accrual	Activity related to the warranty accrual was as follows (in thousands): Three Months Ended Six Months Ended June 29, 2019 June 30, 2018 June 29, 2019 June 30, 2018 Balance at beginning of period $ 11,628 $ 11,833 $ 11,964 $ 11,264 Provision 2,682 2,193 5,333 4,628 Warranty usage (2,340 ) (2,793 ) (5,327 ) (4,659 ) Balance at end of period $ 11,970 $ 11,233 $ 11,970 $ 11,233

Industry Segment, Geographic _2

Industry Segment, Geographic Information and Significant Customers (Tables)	6 Months Ended
	Jun. 29, 2019
Segment Reporting [Abstract]
Segment Information about Revenue, Cost of Revenue, Gross Margin and Income before Income Taxes	The Company operates as one

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Document Period End Date			Jun. 29, 2019
Net income	$ 7,207	$ 10,471	$ 29,727	$ 30,872
Weighted-average shares outstanding	28,079	27,615	27,970	27,802
Dilutive effect of employee stock options and restricted shares	684	722	809	856
Diluted weighted-average shares outstanding	28,763	28,337	28,779	28,658
Basic income per share	$ 0.26	$ 0.38	$ 1.06	$ 1.11
Diluted income per share	$ 0.25	$ 0.37	$ 1.03	$ 1.08
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	200		100

Summary of Significant Accoun_4

Summary of Significant Accounting Policies Other Assets (Details) - USD ($) $ in Millions	Jun. 29, 2019	Dec. 29, 2018
Equity and cost method investments [Abstract]
Equity Securities without Readily Determinable Fair Value, Amount	$ 21.6	$ 15.1

Revenue Recognition Significant

Revenue Recognition Significant Judgments (Details) - USD ($) $ in Millions	Jun. 29, 2019	Dec. 29, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Refund liability, product returns	$ 44.5	$ 53.9
Refund liability, other credits and incentives	$ 69.7	$ 97.7

Revenue Recognition Disaggreg_2

Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 260,172	$ 226,317	$ 497,833	$ 443,385
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	124,472	111,526	238,537	218,388
EMEA [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	82,893	70,123	157,462	139,710
All Other Regions [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 52,807	$ 44,668	$ 101,834	$ 85,287

Revenue Recognition Contract _2

Revenue Recognition Contract Balances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Dec. 29, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Accounts Receivable, Net, Current	$ 90,401		$ 90,401		$ 162,166
Contract with Customer, Liability, Revenue Recognized	5,300	$ 6,300	5,800	$ 6,700
Contract with Customer, Liability	$ 3,075		$ 3,075		$ 5,756

Leases Lease Cost (Details)

Leases Lease Cost (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 29, 2019USD ($)	Jun. 29, 2019USD ($)
Leases [Abstract]
Operating Lease, Weighted Average Discount Rate, Percent	3.61%	3.61%
Operating Lease, Cost	$ 1,969	$ 3,939
Variable Lease, Cost	1,316	2,136
Lease, Cost	$ 3,285	$ 6,075
Operating Lease, Weighted Average Remaining Lease Term	9 years 6 months 29 days	9 years 6 months 29 days

Leases Supplemental Cash Flow (

Leases Supplemental Cash Flow (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 29, 2019	Jun. 29, 2019
Leases [Abstract]
Document Period End Date		Jun. 29, 2019
Operating Lease, Payments	$ 2,865	$ 4,881
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0	$ 52,767

Leases Maturity of Operating Le

Leases Maturity of Operating Lease LIability (Details) - USD ($) $ in Thousands	Jun. 29, 2019	Dec. 30, 2018	Dec. 29, 2018
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 3,435
Lessee, Operating Lease, Liability, Payments, Due Year Two	8,543
Lessee, Operating Lease, Liability, Payments, Due Year Three	8,255
Lessee, Operating Lease, Liability, Payments, Due Year Four	7,580
Lessee, Operating Lease, Liability, Payments, Due Year Five	7,127
Lessee, Operating Lease, Liability, Payments, Due after Year Five	41,198
Lessee, Operating Lease, Liability, Payments, Due	76,138
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	12,548
Operating Lease, Liability	63,590	$ 67,300
Operating Lease, Liability, Current	5,522		$ 0
Operating Lease, Liability, Noncurrent	$ 58,068		$ 0

Leases Financial Statement Impa

Leases Financial Statement Impact of Adopting ASC 842 (Details) - USD ($) $ in Thousands	Jun. 29, 2019	Dec. 30, 2018	Dec. 29, 2018
Leases [Abstract]
Operating lease right-of-use asset	$ 50,002	$ 52,800	$ 0
Operating Lease, Liability	$ 63,590	$ 67,300

Inventory (Details)

Inventory (Details) - USD ($) $ in Thousands	Jun. 29, 2019	Dec. 29, 2018
Inventory Disclosure [Abstract]
Inventory, Raw Materials, Net of Reserves	$ 2,922	$ 2,992
Inventory, Finished Goods, Net of Reserves	189,088	161,641
Inventory	$ 192,010	$ 164,633

Goodwill, Other Intangible As_3

Goodwill, Other Intangible Assets and Other Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Dec. 29, 2018
Business Acquisition [Line Items]
Goodwill	$ 120,538		$ 120,538		$ 118,896
Amortization of Acquired Intangible Assets	$ 3,400	$ 4,900	$ 6,700	$ 10,000

Goodwill, Other Intangible As_4

Goodwill, Other Intangible Assets and Other Assets - Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Dec. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Document Period End Date			Jun. 29, 2019
Finite-Lived Intangible Assets, Gross	$ 72,064		$ 72,064		$ 71,053
Intangible assets accumulated amortization	53,428		53,428		46,780
Intangible Assets, Net	18,636		18,636		24,273
Amortization of Acquired Intangible Assets	3,400	$ 4,900	6,700	$ 10,000
Completed technology
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	28,100		28,100		26,900
Intangible assets accumulated amortization	23,396		23,396		21,607
Intangible Assets, Net	4,704		4,704		5,293
Trade Names
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	100		100		100
Intangible assets accumulated amortization	100		100		100
Intangible Assets, Net	0		0		0
Customer-Related Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	11,255		11,255		11,291
Intangible assets accumulated amortization	1,859		1,859		1,365
Intangible Assets, Net	9,396		9,396		9,926
Distribution Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	32,347		32,347		32,499
Intangible assets accumulated amortization	27,921		27,921		23,598
Intangible Assets, Net	4,426		4,426		8,901
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	262		262		263
Intangible assets accumulated amortization	152		152		110
Intangible Assets, Net	$ 110		$ 110		$ 153

Goodwill, Other Intangible As_5

Goodwill, Other Intangible Assets and Other Assets Schedule of goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 29, 2019	Dec. 29, 2018
Goodwill [Line Items]
Goodwill	$ 120,538	$ 118,896
Goodwill, Acquired During Period	2,050
Goodwill, Foreign Currency Translation Gain (Loss)	$ (408)

Goodwill, Other Intangible As_6

Goodwill, Other Intangible Assets and Other Assets Finite-lived intangible assets, schedule of future amortization (Details) $ in Thousands	Jun. 29, 2019USD ($)
Finite-lived intangible assets, schedule of amortization expense [Line Items]
Remainder of 2018	$ 6,132
2019	2,156
2020	1,932
2021	1,707
2022	1,032
Thereafter	5,677
Total	18,636
Cost of revenue
Finite-lived intangible assets, schedule of amortization expense [Line Items]
Remainder of 2018	5,635
2019	1,140
2020	1,140
2021	915
2022	240
Thereafter	60
Total	9,130
Operating Expense [Member]
Finite-lived intangible assets, schedule of amortization expense [Line Items]
Remainder of 2018	497
2019	1,016
2020	792
2021	792
2022	792
Thereafter	5,617
Total	$ 9,506

Accrued Expenses (Details)

Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 29, 2019	Dec. 29, 2018
Accrued Liabilities, Current [Abstract]
Accrued Professional Fees, Current	$ 2,020	$ 2,052
Accounts Payable, Current [Abstract]
Accrued Employee Benefits	12,241	10,518
Accrued warranty	11,970	11,964
Accrued bonus	6,914	21,226
Operating Lease, Liability, Current	5,522	0
Accrued direct fulfillment costs	9,543	5,372
Accrued sales and other taxes payable	4,931	11,397
Accrued federal and state income taxes	2,547	1,936
Accrued other	7,941	6,794
Accrued expenses	$ 63,629	$ 71,259

Derivative Instruments Schedu_2

Derivative Instruments Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Dec. 29, 2018
Derivative [Line Items]
Document Period End Date				Jun. 29, 2019
Revenue		$ 260,172	$ 226,317	$ 497,833	$ 443,385
Total cost of revenue		142,002	108,391	260,117	209,674
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount		389,900		389,900		$ 366,700
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount		48,000		48,000		56,000
Accrued Liabilities [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net		598		598		0
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion	[1]	(2,054)	2,154	4,350	(560)
Other Nonoperating Income (Expense) [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net		(1,085)	1,707	(652)	538
Cost of revenue | Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		0	370	0	(386)
Sales Revenue, Net [Member] | Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		359	$ (113)	214	$ (279)
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Asset		480		480		551
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Accrued Liabilities [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Liability		1,102		1,102		335
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Noncurrent Liabilities [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Liability		833		833		795
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Current Assets [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Asset		1,201		1,201		53
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Noncurrent Assets [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Asset		$ 3,454		$ 3,454		$ 172
[1]	(1) The amount represents the change in fair value of derivative contracts due to changes in spot rates.

Derivative Instruments (Details

Derivative Instruments (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Document Period End Date				Jun. 29, 2019
Revenue		$ 260,172	$ 226,317	$ 497,833	$ 443,385
Total cost of revenue		142,002	108,391	260,117	209,674
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	[1]	(2,054)	2,154	4,350	(560)
Foreign Exchange Forward [Member] | Sales Revenue, Net [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		359	(113)	214	(279)
Foreign Exchange Forward [Member] | Cost of revenue | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ 0	$ 370	$ 0	$ (386)
[1]	(1) The amount represents the change in fair value of derivative contracts due to changes in spot rates.

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 29, 2019		Dec. 29, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		$ 0		$ 2,000
Available-for-sale Securities, Amortized Cost Basis	[1]	24,018		30,035
conversion of debt		(2,000)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure				3,730
Available-for-sale Securities		0	[1]	0
Convertible Debt, Fair Value Disclosures				0
Derivative Asset		0		0
Assets, Fair Value Disclosure		0		3,730
Derivative Liability		0		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure		0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	[2]			0
Available-for-sale Securities	[2]	23,984	[1]	29,605
Convertible Debt, Fair Value Disclosures	[2]			0
Derivative Asset		5,135		776	[2]
Assets, Fair Value Disclosure	[2]	29,119		30,381
Derivative Liability	[2]	2,533		1,130
Financial and Nonfinancial Liabilities, Fair Value Disclosure	[2]	2,533		1,130
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	[3]			0
Available-for-sale Securities	[3]	0	[1]	0
Convertible Debt, Fair Value Disclosures	[3]			2,000
Derivative Asset	[3]	0		0
Assets, Fair Value Disclosure	[3]	0		2,000
Derivative Liability		0		0	[3]
Financial and Nonfinancial Liabilities, Fair Value Disclosure		$ 0		$ 0	[3]
[1]	As of June 29, 2019, the Company’s investments had maturity dates ranging from August 2019 to March 2021.
[2]	Level 2 fair value estimates are based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
[3]	Level 3 fair value estimates are based on inputs that are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques, including option pricing and discounted cash flow models. Unobservable inputs used in the models are significant to the fair values of the assets and liabilities.

Stockholders Equity (Details)

Stockholders Equity (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 29, 2018	Feb. 27, 2018
Equity [Abstract]
Stock Repurchase Program, Authorized Amount				$ 50,000,000
Stock Repurchased and Retired During Period, Shares	769,000	799,000	798,794
Stock Repurchased and Retired During Period, Value	$ 48,070,000	$ 50,000,000	$ 50,000,000

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Millions	Jun. 29, 2019USD ($)
Outstanding POs [Abstract]
Contractual Obligation	$ 213

Commitments and Contingencies_2

Commitments and Contingencies - Activity Related to Warranty Accrual (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 11,628	$ 11,833	$ 11,964	$ 11,264
Provision	2,682	2,193	5,333	4,628
Warranty usage	(2,340)	(2,793)	(5,327)	(4,659)
Balance at end of period	$ 11,970	$ 11,233	$ 11,970	$ 11,233

Income Taxes (Details)

Income Taxes (Details)	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	(6.30%)	29.60%	2.00%	24.30%

Industry Segment, Geographic _3

Industry Segment, Geographic Information and Significant Customers - Segment Information about Revenue, Cost of Revenue, Gross Margin and Income before Income Taxes (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 29, 2019USD ($)segment	Jun. 30, 2018USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of Reportable Segments | segment			1
Total cost of revenue	$ 142,002	$ 108,391	$ 260,117	$ 209,674
Gross profit	118,170	117,926	237,716	233,711
Research and development	35,650	34,924	70,919	67,869
Selling and marketing	56,409	45,910	95,245	77,239
General and administrative	20,592	23,468	43,499	49,301
Other income, net	$ 1,533	$ 1,507	$ 2,813	$ 2,026

Industry Segment, Geographic _4

Industry Segment, Geographic Information and Significant Customers - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Document Period End Date			Jun. 29, 2019
Sales Revenue, Net [Member] | Amazon [Member] | Customer Concentration Risk [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	28.00%	23.80%	22.30%	17.70%