iRobot (IRBT) 10-Q 2 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 30, 2019	Apr. 27, 2019
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	IRBT
Entity Registrant Name	IROBOT CORP
Entity Central Index Key	0001159167
Current Fiscal Year End Date	--12-28
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		28,054,998

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Current assets:
Cash and cash equivalents	$ 173,094	$ 130,373
Short term investments	27,363	31,605
Accounts receivable, net	54,496	162,166
Inventory	181,128	164,633
Other current assets	30,526	25,660
Total current assets	466,607	514,437
Property and equipment, net	66,616	57,026
Operating lease right-of-use assets	51,418	0
Deferred tax assets	32,921	36,979
Goodwill	117,546	118,896
Intangible assets, net	20,689	24,273
Other assets	23,305	15,350
Total assets	779,102	766,961
Current liabilities:
Accounts payable	84,690	136,742
Accrued expenses	54,869	71,259
Deferred revenue and customer advances	5,267	5,756
Total current liabilities	144,826	213,757
Operating lease liabilities	59,805	0
Deferred tax liabilities	3,296	4,005
Other long-term liabilities	8,552	13,877
Total long-term liabilities	71,653	17,882
Total liabilities	216,479	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; 28,038 and 27,788 shares issued and outstanding, respectively	280	278
Additional paid-in capital	175,000	172,771
Retained earnings	389,541	367,021
Accumulated other comprehensive loss	(2,198)	(4,748)
Total stockholders’ equity	562,623	535,322
Total liabilities and stockholders’ equity	$ 779,102	$ 766,961

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Mar. 30, 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	28,038,000	27,788,000
Common stock, shares outstanding	28,038,000	27,788,000

Consolidated Statements of Inco

Consolidated Statements of Income Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Revenue	$ 237,661	$ 217,068
Cost of product revenue	115,038	96,501
Amortization of acquired intangible assets	3,077	4,782
Total cost of revenue	118,115	101,283
Gross profit	119,546	115,785
Research and development	35,269	32,945
Selling and marketing	38,836	31,329
General and administrative	22,907	25,833
Amortization of acquired intangible assets	271	273
Total operating expenses	97,283	90,380
Operating income	22,263	25,405
Other income, net	1,280	519
Income before income taxes	23,543	25,924
Income tax expense	1,023	5,523
Net income	$ 22,520	$ 20,401
Basic	$ 0.81	$ 0.73
Diluted	$ 0.78	$ 0.71
Basic	27,863	27,988
Diluted	28,763	28,923

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Net income	$ 22,520	$ 20,401
Other comprehensive income (loss):
Net foreign currency translation adjustments	(2,470)	5,338
Net unrealized gains (losses) on cash flow hedges, net of tax	4,801	(1,851)
Net (gains) losses on cash flow hedge reclassified into earnings, net of tax	106	590
Net unrealized gains (losses) on marketable securities, net of tax	113	(172)
Total comprehensive income	$ 25,070	$ 24,306

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)		11,000
Stock Issued During Period, Value, Stock Options Exercised	399	$ 0	399
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)		197,000
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	5,946		5,946
Shares Paid for Tax Withholding for Share Based Compensation (in shares)		(50,000)
Stock Withheld to Cover Tax Withholding Requirements Upon Vesting to Restricted Stock Units Amount	(3,476)	$ (1)	(3,475)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	3,905				3,905
Adjustments to Additional Paid in Capital Directors Deferred Compensation	16		16
Net income	$ 20,401			20,401
Stock Repurchased and Retired During Period, Shares	(30,000)
Stock Repurchased and Retired During Period, Value	$ (1,930)	$ 0	(1,930)
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
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)		77,000
Stock Issued During Period, Value, Stock Options Exercised	2,563	$ 1	2,562
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)		231,000
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	6,864		6,864
Shares Paid for Tax Withholding for Share Based Compensation (in shares)		(58,000)
Stock Withheld to Cover Tax Withholding Requirements Upon Vesting to Restricted Stock Units Amount	(7,212)	$ (1)	(7,211)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	2,550				2,550
Adjustments to Additional Paid in Capital Directors Deferred Compensation	16		16
Net income	$ 22,520			22,520
Beginning Balance, Shares	28,038,000	28,038,000
Beginning balance	$ 562,623	$ 280	$ 175,000	$ 389,541	$ (2,198)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 22,520	$ 20,401
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,724	8,716
Stock-based compensation	6,864	5,946
Deferred income taxes, net	1,739	(3,061)
Other	1,542	1,514
Changes in operating assets and liabilities — (use) source
Accounts receivable	106,561	73,642
Inventory	(16,863)	(4,223)
Prepaid and other current assets	(2,913)	(6,114)
Accounts payable	(52,744)	(46,461)
Accrued expenses and other liabilities	(22,727)	(20,570)
Net cash provided by operating activities	52,703	29,790
Cash flows from investing activities:
Additions of property and equipment	(6,004)	(8,717)
Change in other assets	(1,977)	379
Purchases of investments	0	(6,438)
Sales and maturities of investments	2,380	3,500
Net cash used in investing activities	(5,601)	(11,276)
Cash flows from financing activities:
Proceeds from employee stock plans	2,563	399
Income tax withholding payment associated with restricted stock vesting	(7,212)	(3,478)
Net cash used in financing activities	(4,649)	(3,079)
Effect of exchange rate changes on cash and cash equivalents	268	431
Net increase in cash and cash equivalents	42,721	15,866
Cash and cash equivalents, at beginning of period	130,373	128,635
Cash and cash equivalents, at end of period	173,094	144,501
Supplemental disclosure of cash flow information:
Cash paid for income taxes	718	4,660
Additions of property and equipment included in accounts payable	$ 3,029	$ 3,003

Description of Business

Description of Business	3 Months Ended
	Mar. 30, 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	3 Months Ended
	Mar. 30, 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 SEC 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 March 30, 2019 and December 29, 2018 , other assets consisted primarily of equity securities without readily determinable fair values and an equity method investment totaling $19.0 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 March 30, 2019 March 31, 2018 Net income $ 22,520 $ 20,401 Weighted-average common shares outstanding 27,863 27,988 Dilutive effect of employee stock awards 900 935 Diluted weighted-average common shares outstanding 28,763 28,923 Basic income per share $ 0.81 $ 0.73 Diluted income per share $ 0.78 $ 0.71 Restricted stock units and stock options representing approximately 0.0 million and 0.1 million shares of common stock for the three months ended March 30, 2019 and March 31, 2018 , respectively, 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. Adoption of the new standard 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 for the three months ended March 30, 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," which 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 standard 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)	3 Months Ended
	Mar. 30, 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 have the ability to learn, map and adapt to a home's floor plan. The Company has concluded that 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 elements 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 March 30, 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 March 30, 2019 , the Company has reserves for product returns of $45.6 million and other credits and incentives of $60.7 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 March 30, 2019 and March 31, 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 March 30, 2019 March 31, 2018 United States $ 114,065 $ 106,862 EMEA 74,569 69,587 Other 49,027 40,619 Total revenue $ 237,661 $ 217,068 Contract Balances The following table provides information about receivables and contract liabilities from contracts with customers (in thousands): March 30, 2019 December 29, 2018 Accounts receivable, net $ 54,496 $ 162,166 Contract liabilities 5,267 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 March 30, 2019 and March 31, 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)	3 Months Ended
	Mar. 30, 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 March 30, 2019 , the Company's weighted average discount rate was 3.61% , while the weighted average remaining lease term was 9.83 years. The components of lease expense were as follows (in thousands): Three Months Ended March 30, 2019 Operating lease cost $ 1,973 Variable lease cost 825 Total lease cost $ 2,798 Supplemental cash flow information related to leases was as follows (in thousands): Three Months Ended March 30, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 2,020 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 52,767 Maturities of operating lease liabilities were as follows as of March 30, 2019 (in thousands): Operating leases Remainder of 2019 $ 5,633 2020 8,557 2021 8,265 2022 7,594 2023 7,148 Thereafter 41,277 Total minimum lease payments $ 78,474 Less: imputed interest 13,148 Present value of future minimum lease payments $ 65,326 Less: current portion of operating lease liabilities (Note 7) 5,521 Long-term lease liabilities $ 59,805 Financial Statement Impact of Adopting ASC 842 The Company adopted ASC 842 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. 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	3 Months Ended
	Mar. 30, 2019
Inventory Disclosure [Abstract]
Inventory	Inventory Inventory consists of the following (in thousands): March 30, 2019 December 29, 2018 Raw materials $ 2,910 $ 2,992 Finished goods 178,218 161,641 $ 181,128 $ 164,633

Goodwill, Other Intangible Asse

Goodwill, Other Intangible Assets and Other Assets	3 Months Ended
	Mar. 30, 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 three months ended March 30, 2019 (in thousands): Balance as of December 29, 2018 $ 118,896 Effect of foreign currency translation (1,350 ) Balance as of March 30, 2019 $ 117,546 Intangible assets at March 30, 2019 and December 29, 2018 consisted of the following (in thousands): March 30, 2019 December 29, 2018 Cost Accumulated Amortization Net Cost Accumulated Amortization Net Completed technology $ 26,900 $ 22,471 $ 4,429 $ 26,900 $ 21,607 $ 5,293 Tradename 100 100 — 100 100 — Customer relationships 11,037 1,464 9,573 11,291 1,365 9,926 Reacquired distribution rights 32,000 25,443 6,557 32,499 23,598 8,901 Non-competition agreements 258 128 130 263 110 153 Total $ 70,295 $ 49,606 $ 20,689 $ 71,053 $ 46,780 $ 24,273 Amortization expense related to acquired intangible assets was $3.3 million and $5.1 million for the three months ended March 30, 2019 and March 31, 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 $ 8,511 $ 874 $ 9,385 2020 900 998 1,898 2021 900 777 1,677 2022 675 777 1,452 2023 — 777 777 Thereafter — 5,500 5,500 Total $ 10,986 $ 9,703 $ 20,689

Accrued Expenses

Accrued Expenses	3 Months Ended
	Mar. 30, 2019
Accrued Liabilities, Current [Abstract]
Accrued Expenses	Accrued Expenses Accrued expenses consisted of the following at (in thousands): March 30, 2019 December 29, 2018 Accrued other compensation $ 14,549 $ 10,518 Accrued warranty 11,628 11,964 Accrued bonus 5,522 21,226 Current portion of operating lease liabilities 5,521 — Accrued direct fulfillment costs 4,595 5,372 Accrued sales and other indirect taxes payable 2,631 11,397 Accrued income taxes 2,531 1,936 Accrued accounting fees 2,449 2,052 Accrued other 5,443 6,794 $ 54,869 $ 71,259

Derivative Instruments (Notes)

Derivative Instruments (Notes)	3 Months Ended
	Mar. 30, 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 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 March 30, 2019 and December 29, 2018 , the Company had outstanding cash flow hedges with a total notional value of $379.6 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 March 30, 2019 and December 29, 2018 , the Company had outstanding economic hedges with a total notional value of $30.3 million and $56.0 million , respectively. The fair values of derivative instruments are as follows (in thousands): Fair Value Classification March 30, 2019 December 29, 2018 Derivatives not designated as hedging instruments: Foreign currency forward contracts Other current assets $ 617 $ 551 Derivatives designated as cash flow hedges: Foreign currency forward contracts Other current assets $ 1,468 $ 53 Foreign currency forward contracts Other assets 4,226 172 Foreign currency forward contracts Accrued expenses 130 335 Foreign currency forward contracts Long-term liabilities 105 795 Gains (losses) associated with derivative instruments not designated as hedging instruments are as follows (in thousands): Three Months Ended Classification March 30, 2019 March 31, 2018 Gain (loss) recognized in income Other income, net $ 433 $ (1,169 ) The following tables reflect the effect of derivatives designated as cash flow hedging for the three months ended March 29, 2019 and March 31, 2018 (in thousands): Gain (loss) recognized in OCI on Derivative (1) Three Months Ended March 30, 2019 March 31, 2018 Foreign currency forward contracts $ 6,404 $ (2,714 ) (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 March 30, 2019 March 31, 2018 Revenue Cost of revenue Revenue Cost of revenue Consolidated statements of income in which the effects of cash flow hedging instruments are recorded $ 237,661 $ 118,115 $ 217,068 $ 101,283 Gain or (loss) on cash flow hedging relationships: Foreign currency forward contracts: Amount of gain (loss) reclassified from AOCI into earnings $ (144 ) $ — $ (166 ) $ (755 )

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	3 Months Ended
	Mar. 30, 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 March 30, 2019 , were as follows (in thousands): Fair Value Measurements as of Level 1 Level 2 (1) Level 3 (2) Assets: Corporate and government bonds, $27,615 at cost (3) $ — $ 27,363 $ — Derivative instruments (Note 8) — 6,311 — Total assets measured at fair value $ — $ 33,674 $ — Liabilities: Derivative instruments (Note 8) $ — $ 235 $ — Total liabilities measured at fair value $ — $ 235 $ — 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 March 30, 2019 , the Company’s investments had maturity dates ranging from May 2019 to March 2021. The following table provides a summary of changes in fair value of our Level 3 investment for the three months ended March 30, 2019 (in thousands): Balance as of December 29, 2018 $ 2,000 Conversion of convertible note (2,000 ) Balance as of March 30, 2019 $ —

Stockholders Equity (Notes)

Stockholders Equity (Notes)	3 Months Ended
	Mar. 30, 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. The Company repurchased 30,000 shares of common stock for $1.9 million under the program during the three months ended March 31, 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	3 Months Ended
	Mar. 30, 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 March 30, 2019 , the Company had outstanding purchase orders aggregating approximately $155.1 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 March 30, 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 March 30, 2019 March 31, 2018 Balance at beginning of period $ 11,964 $ 11,264 Provision 2,652 2,435 Warranty usage (2,988 ) (1,866 ) Balance at end of period $ 11,628 $ 11,833

Income Taxes (Notes)

Income Taxes (Notes)	3 Months Ended
	Mar. 30, 2019
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes The Company’s effective income tax rate for the three months ended March 30, 2019 and March 31, 2018 , was 4.3% and 21.3% , respectively. The decrease in the effective income tax rate was primarily due to increased tax benefits related to excess stock-based compensation partially offset by an increase in foreign taxes in the three months ended March 30, 2019. The Company's effective income tax rate of 4.3% for the three months ended March 30, 2019 differed from the federal statutory tax rate of 21% primarily due to the recognition of tax benefits related to excess stock-based compensation partially offset by an increase in foreign taxes.

Industry Segment, Geographic In

Industry Segment, Geographic Information and Significant Customers	3 Months Ended
	Mar. 30, 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 March 30, 2019 and March 31, 2018 , the Company generated 16.1% and 11.3% of total revenue, respectively, from one of its retailers (Amazon).

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 30, 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 SEC 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 March 30, 2019 and December 29, 2018 , other assets consisted primarily of equity securities without readily determinable fair values and an equity method investment totaling $19.0 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 March 30, 2019 March 31, 2018 Net income $ 22,520 $ 20,401 Weighted-average common shares outstanding 27,863 27,988 Dilutive effect of employee stock awards 900 935 Diluted weighted-average common shares outstanding 28,763 28,923 Basic income per share $ 0.81 $ 0.73 Diluted income per share $ 0.78 $ 0.71 Restricted stock units and stock options representing approximately 0.0 million and 0.1 million shares of common stock for the three months ended March 30, 2019 and March 31, 2018 , respectively, were excluded from the computation of diluted earnings per share as their effect would have been antidilutive.
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. Adoption of the new standard 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 for the three months ended March 30, 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," which 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 standard 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)	3 Months Ended
	Mar. 30, 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 March 30, 2019 March 31, 2018 United States $ 114,065 $ 106,862 EMEA 74,569 69,587 Other 49,027 40,619 Total revenue $ 237,661 $ 217,068

Revenue Recognition Contract Ba

Revenue Recognition Contract Balances (Tables)	3 Months Ended
	Mar. 30, 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): March 30, 2019 December 29, 2018 Accounts receivable, net $ 54,496 $ 162,166 Contract liabilities 5,267 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 March 30, 2019 and March 31, 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)	3 Months Ended
	Mar. 30, 2019
Operating Lease Cost [Abstract]
Lease, Cost [Table Text Block]	The components of lease expense were as follows (in thousands): Three Months Ended March 30, 2019 Operating lease cost $ 1,973 Variable lease cost 825 Total lease cost $ 2,798
ScheduleOfLeasesSupplementalCashFlow [Table Text Block]	Supplemental cash flow information related to leases was as follows (in thousands): Three Months Ended March 30, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 2,020 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 March 30, 2019 (in thousands): Operating leases Remainder of 2019 $ 5,633 2020 8,557 2021 8,265 2022 7,594 2023 7,148 Thereafter 41,277 Total minimum lease payments $ 78,474 Less: imputed interest 13,148 Present value of future minimum lease payments $ 65,326 Less: current portion of operating lease liabilities (Note 7) 5,521 Long-term lease liabilities $ 59,805

Inventory (Tables)

Inventory (Tables)	3 Months Ended
	Mar. 30, 2019
Inventory Disclosure [Abstract]
Components of Inventory	Inventory Inventory consists of the following (in thousands): March 30, 2019 December 29, 2018 Raw materials $ 2,910 $ 2,992 Finished goods 178,218 161,641 $ 181,128 $ 164,633

Goodwill, Other Intangible As_2

Goodwill, Other Intangible Assets and Other Assets (Tables)	3 Months Ended
	Mar. 30, 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 three months ended March 30, 2019 (in thousands): Balance as of December 29, 2018 $ 118,896 Effect of foreign currency translation (1,350 ) Balance as of March 30, 2019 $ 117,546
Other Intangible Assets	Intangible assets at March 30, 2019 and December 29, 2018 consisted of the following (in thousands): March 30, 2019 December 29, 2018 Cost Accumulated Amortization Net Cost Accumulated Amortization Net Completed technology $ 26,900 $ 22,471 $ 4,429 $ 26,900 $ 21,607 $ 5,293 Tradename 100 100 — 100 100 — Customer relationships 11,037 1,464 9,573 11,291 1,365 9,926 Reacquired distribution rights 32,000 25,443 6,557 32,499 23,598 8,901 Non-competition agreements 258 128 130 263 110 153 Total $ 70,295 $ 49,606 $ 20,689 $ 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 $ 8,511 $ 874 $ 9,385 2020 900 998 1,898 2021 900 777 1,677 2022 675 777 1,452 2023 — 777 777 Thereafter — 5,500 5,500 Total $ 10,986 $ 9,703 $ 20,689

Accrued Expenses (Tables)

Accrued Expenses (Tables)	3 Months Ended
	Mar. 30, 2019
Accrued Liabilities, Current [Abstract]
Components of Accrued Expenses	March 30, 2019 December 29, 2018 Accrued other compensation $ 14,549 $ 10,518 Accrued warranty 11,628 11,964 Accrued bonus 5,522 21,226 Current portion of operating lease liabilities 5,521 — Accrued direct fulfillment costs 4,595 5,372 Accrued sales and other indirect taxes payable 2,631 11,397 Accrued income taxes 2,531 1,936 Accrued accounting fees 2,449 2,052 Accrued other 5,443 6,794 $ 54,869 $ 71,259

Derivative Instruments (Tables)

Derivative Instruments (Tables)	3 Months Ended
	Mar. 30, 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 Classification March 30, 2019 March 31, 2018 Gain (loss) recognized in income Other income, net $ 433 $ (1,169 ) The following tables reflect the effect of derivatives designated as cash flow hedging for the three months ended March 29, 2019 and March 31, 2018 (in thousands): Gain (loss) recognized in OCI on Derivative (1) Three Months Ended March 30, 2019 March 31, 2018 Foreign currency forward contracts $ 6,404 $ (2,714 ) (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 March 30, 2019 March 31, 2018 Revenue Cost of revenue Revenue Cost of revenue Consolidated statements of income in which the effects of cash flow hedging instruments are recorded $ 237,661 $ 118,115 $ 217,068 $ 101,283 Gain or (loss) on cash flow hedging relationships: Foreign currency forward contracts: Amount of gain (loss) reclassified from AOCI into earnings $ (144 ) $ — $ (166 ) $ (755 )

Derivative Instruments Schedule

Derivative Instruments Schedule of Derivative Instruments (Tables)	3 Months Ended
	Mar. 30, 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 months ended March 29, 2019 and March 31, 2018 (in thousands): Gain (loss) recognized in OCI on Derivative (1) Three Months Ended March 30, 2019 March 31, 2018 Foreign currency forward contracts $ 6,404 $ (2,714 )
Schedule of Derivative Instruments [Table Text Block]	The fair values of derivative instruments are as follows (in thousands): Fair Value Classification March 30, 2019 December 29, 2018 Derivatives not designated as hedging instruments: Foreign currency forward contracts Other current assets $ 617 $ 551 Derivatives designated as cash flow hedges: Foreign currency forward contracts Other current assets $ 1,468 $ 53 Foreign currency forward contracts Other assets 4,226 172 Foreign currency forward contracts Accrued expenses 130 335 Foreign currency forward contracts Long-term liabilities 105 795

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 30, 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 March 30, 2019 March 31, 2018 Balance at beginning of period $ 11,964 $ 11,264 Provision 2,652 2,435 Warranty usage (2,988 ) (1,866 ) Balance at end of period $ 11,628 $ 11,833

Industry Segment, Geographic _2

Industry Segment, Geographic Information and Significant Customers (Tables)	3 Months Ended
	Mar. 30, 2019
Segment Reporting [Abstract]
Segment Information about Revenue, Cost of Revenue, Gross Margin and Income before Income Taxes	The Company operates as one operating segment.

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
	Mar. 30, 2019	Mar. 31, 2018
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Net income	$ 22,520	$ 20,401
Weighted-average shares outstanding	27,863	27,988
Dilutive effect of employee stock options and restricted shares	900	935
Diluted weighted-average shares outstanding	28,763	28,923
Basic income per share	$ 0.81	$ 0.73
Diluted income per share	$ 0.78	$ 0.71
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	100

Summary of Significant Accoun_4

Summary of Significant Accounting Policies Other Assets (Details) - USD ($) $ in Millions	Mar. 30, 2019	Dec. 29, 2018
Equity and cost method investments [Abstract]
Equity Securities without Readily Determinable Fair Value, Amount	$ 19	$ 15.1

Revenue Recognition Significant

Revenue Recognition Significant Judgments (Details) - USD ($) $ in Millions	Mar. 30, 2019	Dec. 29, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Refund liability, product returns	$ 45.6	$ 53.9
Refund liability, other credits and incentives	$ 60.7	$ 97.7

Revenue Recognition Disaggreg_2

Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 237,661	$ 217,068
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	114,065	106,862
EMEA [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	74,569	69,587
All Other Regions [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 49,027	$ 40,619

Revenue Recognition Contract _2

Revenue Recognition Contract Balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018
Revenue Recognition and Deferred Revenue [Abstract]
Accounts Receivable, Net, Current	$ 54,496		$ 162,166
Contract with Customer, Liability, Revenue Recognized	$ 5,800	$ 6,700

Leases Lease Cost (Details)

Leases Lease Cost (Details) $ in Thousands	3 Months Ended
	Mar. 30, 2019USD ($)
Leases [Abstract]
Operating Lease, Weighted Average Discount Rate, Percent	3.61%
Operating Lease, Cost	$ 1,973
Variable Lease, Cost	825
Lease, Cost	$ 2,798
Operating Lease, Weighted Average Remaining Lease Term	9 years 10 months

Leases Supplemental Cash Flow (

Leases Supplemental Cash Flow (Details) $ in Thousands	3 Months Ended
	Mar. 30, 2019USD ($)
Leases [Abstract]
Operating Lease, Payments	$ 2,020
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 52,767

Leases Maturity of Operating Le

Leases Maturity of Operating Lease LIability (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 30, 2018	Dec. 29, 2018
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 5,633
Lessee, Operating Lease, Liability, Payments, Due Year Two	8,557
Lessee, Operating Lease, Liability, Payments, Due Year Three	8,265
Lessee, Operating Lease, Liability, Payments, Due Year Four	7,594
Lessee, Operating Lease, Liability, Payments, Due Year Five	7,148
Lessee, Operating Lease, Liability, Payments, Due after Year Five	41,277
Lessee, Operating Lease, Liability, Payments, Due	78,474
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	13,148
Operating Lease, Liability	65,326	$ 67,300
Operating Lease, Liability, Current	5,521		$ 0
Operating Lease, Liability, Noncurrent	$ 59,805		$ 0

Leases Financial Statement Impa

Leases Financial Statement Impact of Adopting ASC 842 (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 30, 2018	Dec. 29, 2018
Leases [Abstract]
Operating lease right-of-use asset	$ 51,418	$ 52,800	$ 0
Operating Lease, Liability	$ 65,326	$ 67,300

Inventory (Details)

Inventory (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Inventory Disclosure [Abstract]
Inventory, Raw Materials, Net of Reserves	$ 2,910	$ 2,992
Inventory, Finished Goods, Net of Reserves	178,218	161,641
Inventory	$ 181,128	$ 164,633

Goodwill, Other Intangible As_3

Goodwill, Other Intangible Assets and Other Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018
Business Acquisition [Line Items]
Goodwill	$ 117,546		$ 118,896
Amortization of Acquired Intangible Assets	$ 3,300	$ 5,100

Goodwill, Other Intangible As_4

Goodwill, Other Intangible Assets and Other Assets - Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 70,295		$ 71,053
Intangible assets accumulated amortization	49,606		46,780
Intangible Assets, Net	20,689		24,273
Amortization of Acquired Intangible Assets	3,300	$ 5,100
Completed technology
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	26,900		26,900
Intangible assets accumulated amortization	22,471		21,607
Intangible Assets, Net	4,429		5,293
Trade Names
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	100		100
Intangible assets accumulated amortization	100		100
Intangible Assets, Net	0		0
Customer-Related Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	11,037		11,291
Intangible assets accumulated amortization	1,464		1,365
Intangible Assets, Net	9,573		9,926
Distribution Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	32,000		32,499
Intangible assets accumulated amortization	25,443		23,598
Intangible Assets, Net	6,557		8,901
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	258		263
Intangible assets accumulated amortization	128		110
Intangible Assets, Net	$ 130		$ 153

Goodwill, Other Intangible As_5

Goodwill, Other Intangible Assets and Other Assets Schedule of goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Dec. 29, 2018
Goodwill [Line Items]
Goodwill	$ 117,546	$ 118,896
Goodwill, Foreign Currency Translation Gain (Loss)	$ (1,350)

Goodwill, Other Intangible As_6

Goodwill, Other Intangible Assets and Other Assets Finite-lived intangible assets, schedule of future amortization (Details) $ in Thousands	Mar. 30, 2019USD ($)
Finite-lived intangible assets, schedule of amortization expense [Line Items]
Remainder of 2018	$ 9,385
2019	1,898
2020	1,677
2021	1,452
2022	777
Thereafter	5,500
Total	20,689
Cost of revenue
Finite-lived intangible assets, schedule of amortization expense [Line Items]
Remainder of 2018	8,511
2019	900
2020	900
2021	675
2022	0
Thereafter	0
Total	10,986
Operating Expense [Member]
Finite-lived intangible assets, schedule of amortization expense [Line Items]
Remainder of 2018	874
2019	998
2020	777
2021	777
2022	777
Thereafter	5,500
Total	$ 9,703

Accrued Expenses (Details)

Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Accrued Liabilities, Current [Abstract]
Accrued Professional Fees, Current	$ 2,449	$ 2,052
Accounts Payable, Current [Abstract]
Accrued Employee Benefits	14,549	10,518
Accrued warranty	11,628	11,964
Accrued bonus	5,522	21,226
Operating Lease, Liability, Current	5,521	0
Accrued direct fulfillment costs	4,595	5,372
Accrued sales and other taxes payable	2,631	11,397
Accrued federal and state income taxes	2,531	1,936
Accrued other	5,443	6,794
Accrued expenses	$ 54,869	$ 71,259

Derivative Instruments Schedu_2

Derivative Instruments Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018
Derivative [Line Items]
Revenues		$ 237,661	$ 217,068
Total cost of revenue		118,115	101,283
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount		379,600		$ 366,700
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount		30,300		56,000
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion	[1]	6,404	(2,714)
Other Nonoperating Income (Expense) [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net		433	(1,169)
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	(755)
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		(144)	$ (166)
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Asset		617		551
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Accrued Liabilities [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Liability		130		335
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Noncurrent Liabilities [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Liability		105		795
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Current Assets [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Asset		1,468		53
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Noncurrent Assets [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Asset		$ 4,226		$ 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) - Foreign Exchange Forward [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 30, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	[1]	$ 6,404	$ (2,714)
Sales Revenue, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		(144)	(166)
Cost of revenue
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ 0	$ (755)
[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
		Mar. 30, 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]	27,615		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]	27,363	[1]	29,605
Convertible Debt, Fair Value Disclosures	[2]			0
Derivative Asset	[2]	6,311		776
Assets, Fair Value Disclosure	[2]	33,674		30,381
Derivative Liability	[2]	235		1,130
Financial and Nonfinancial Liabilities, Fair Value Disclosure	[2]	235		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 March 30, 2019, the Company’s investments had maturity dates ranging from May 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	12 Months Ended
	Mar. 31, 2018	Dec. 29, 2018	Feb. 27, 2018
Equity [Abstract]
Stock Repurchase Program, Authorized Amount			$ 50,000,000
Stock Repurchased and Retired During Period, Shares	30,000	798,794
Stock Repurchased and Retired During Period, Value	$ 1,930,000	$ 50,000,000

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) $ in Millions	Mar. 30, 2019USD ($)
Outstanding POs [Abstract]
Contractual Obligation	$ 155.1

Commitments and Contingencies_2

Commitments and Contingencies - Activity Related to Warranty Accrual (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 11,964	$ 11,264
Provision	2,652	2,435
Warranty usage	(2,988)	(1,866)
Balance at end of period	$ 11,628	$ 11,833

Income Taxes (Details)

Income Taxes (Details)	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	4.30%	21.30%

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
	Mar. 30, 2019USD ($)segment	Mar. 31, 2018USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of Reportable Segments | segment	1
Total cost of revenue	$ 118,115	$ 101,283
Gross profit	119,546	115,785
Research and development	35,269	32,945
Selling and marketing	38,836	31,329
General and administrative	22,907	25,833
Other income, net	$ 1,280	$ 519

Industry Segment, Geographic _4

Industry Segment, Geographic Information and Significant Customers - Additional Information (Detail)	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Sales Revenue, Net [Member] | Amazon [Member] | Customer Concentration Risk [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	16.10%	11.30%