0001159167-20-000047 | 10-Q | XBRL Viewer

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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 26, 2020	Oct. 24, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Period End Date	Sep. 26, 2020
Document Quarterly Report	true
Document Transition Report	false
Entity Central Index Key	0001159167
Entity File Number	001-36414
Entity Registrant Name	iROBOT CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0259335
Amendment Flag	false
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
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	IRBT
Security Exchange Name	NASDAQ
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--01-02
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		28,127,338

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Current assets:
Cash and cash equivalents	$ 297,206	$ 239,392
Short term investments	60,130	17,032
Accounts receivable, net	179,709	146,161
Inventory	218,134	157,347
Other current assets	52,525	34,285
Total current assets	807,704	594,217
Property and equipment, net	78,296	75,988
Operating lease right-of-use assets	45,186	47,478
Deferred tax assets	33,834	41,791
Goodwill	122,575	118,732
Intangible assets, net	10,146	12,352
Other assets	19,079	30,195
Total assets	1,116,820	920,753
Current liabilities:
Accounts payable	162,346	116,185
Accrued expenses	94,769	81,768
Deferred revenue and customer advances	7,858	4,549
Total current liabilities	264,973	202,502
Operating lease liabilities	51,897	54,928
Deferred tax liabilities	986	912
Other long-term liabilities	17,050	10,342
Total long-term liabilities	69,933	66,182
Total liabilities	334,906	268,684
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; 28,120 and 28,352 shares issued and outstanding, respectively	281	284
Additional paid-in capital	194,628	196,455
Retained earnings	586,054	452,321
Accumulated other comprehensive income	951	3,009
Total stockholders’ equity	781,914	652,069
Total liabilities and stockholders’ equity	$ 1,116,820	$ 920,753

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 26, 2020	Dec. 28, 2019
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	28,120,000	28,352,000
Common stock, shares outstanding	28,120,000	28,352,000

Consolidated Statements of Income Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Revenue	$ 413,145	$ 289,399	$ 885,563	$ 787,232
Cost of product revenue	214,079	149,463	429,060	403,392
Amortization of acquired intangible assets	225	3,095	1,695	9,283
Total cost of revenue	214,304	152,558	430,755	412,675
Gross profit	198,841	136,841	454,808	374,557
Research and development	38,613	33,401	111,929	104,320
Selling and marketing	50,488	42,257	136,144	137,502
General and administrative	28,490	18,372	74,919	61,871
Amortization of acquired intangible assets	256	256	764	796
Total operating expenses	117,847	94,286	323,756	304,489
Operating income	80,994	42,555	131,052	70,068
Other income, net	42,240	900	41,837	3,713
Income before income taxes	123,234	43,455	172,889	73,781
Income tax expense	29,982	7,923	39,156	8,522
Net income	$ 93,252	$ 35,532	$ 133,733	$ 65,259
Basic	$ 3.33	$ 1.26	$ 4.76	$ 2.33
Diluted	$ 3.27	$ 1.24	$ 4.69	$ 2.27
Basic	28,031	28,154	28,084	28,029
Diluted	28,539	28,650	28,502	28,759

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Net income	$ 93,252	$ 35,532	$ 133,733	$ 65,259
Other comprehensive income (loss):
Net foreign currency translation adjustments	5,600	(4,902)	6,864	(5,578)
Net unrealized (losses) gains on cash flow hedges, net of tax	(8,418)	8,175	(5,379)	11,437
Net gains on cash flow hedge reclassified into earnings, net of tax	(745)	(138)	(3,533)	(300)
Net unrealized (losses) gains on marketable securities, net of tax	(30)	36	(10)	244
Total comprehensive income	$ 89,659	$ 38,703	$ 131,675	$ 71,062

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

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		27,788,000
Beginning balance	$ 535,322	$ 278	$ 172,771	$ 367,021	$ (4,748)
Issuance of common stock under employee stock plans (in shares)		125,000
Stock Issued During Period, Value, Stock Options Exercised	4,981	$ 1	4,980
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)		391,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0	$ 4	(4)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	18,742		18,742
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	5,803		5,803
Adjustments to Additional Paid in Capital Directors Deferred Compensation	55		55
Net income	65,259			65,259
Beginning Balance, Shares		28,123,000
Beginning balance	$ 579,576	$ 281	184,663	396,748	(2,116)
Issuance of common stock under employee stock plans (in shares)	301,000	9,000
Stock Issued During Period, Value, Stock Options Exercised		$ 0	301
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)		113,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	$ 0	$ 1	(1)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	4,284		4,284
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	3,171
Adjustments to Additional Paid in Capital Directors Deferred Compensation	21		21
Net income	35,532			35,532
Beginning Balance, Shares		28,245,000
Beginning balance	$ 622,885	$ 282	189,268	432,280	1,055
Beginning Balance, Shares	28,352,000	28,352,000
Beginning balance	$ 652,069	$ 284	196,455	452,321	3,009
Issuance of common stock under employee stock plans (in shares)		122,000
Stock Issued During Period, Value, Stock Options Exercised	4,048	$ 1	4,047
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)		356,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0	$ 3	(3)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	20,904		20,904
Shares Paid for Tax Withholding for Share Based Compensation (in shares)		(46,000)
Stock Withheld to Cover Tax Withholding Requirements Upon Vesting to Restricted Stock Units Amount	(1,845)		(1,845)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(2,058)				(2,058)
Adjustments to Additional Paid in Capital Directors Deferred Compensation	63		63
Net income	$ 133,733			133,733
Stock Repurchased and Retired During Period, Shares	(664,000)
Stock Repurchased and Retired During Period, Value	$ (25,000)	$ (7)	(24,993)
Beginning Balance, Shares		27,998,000
Beginning balance	682,062	$ 280	184,436	492,802	4,544
Issuance of common stock under employee stock plans (in shares)		10,000
Stock Issued During Period, Value, Stock Options Exercised	358	$ 0	358
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)		113,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0	$ 1	(1)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	9,843		9,843
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	(29)	$ 0	(29)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(3,593)				(3,593)
Adjustments to Additional Paid in Capital Directors Deferred Compensation	21		21
Net income	$ 93,252			93,252
Beginning Balance, Shares	28,120,000	28,120,000
Beginning balance	$ 781,914	$ 281	$ 194,628	$ 586,054	$ 951

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019
Cash flows from operating activities:
Net income	$ 133,733	$ 65,259
Adjustments to reconcile net income to net cash provided by (used in) operating activities, net of the effects of acquisition:
Depreciation and amortization	25,705	27,744
Debt and Equity Securities, Unrealized Gain (Loss)	(43,480)	0
Stock-based compensation	20,904	18,742
Deferred income taxes, net	10,939	(5,873)
Other	4,785	4,687
Changes in operating assets and liabilities — (use) source
Accounts receivable	(32,572)	(10,948)
Inventory	(61,006)	(83,863)
Other assets	(20,718)	(8,155)
Accounts payable	46,098	(27,256)
Accrued expenses and other liabilities	12,358	(11,916)
Net cash provided by (used in) operating activities	96,746	(31,579)
Cash flows from investing activities:
Additions of property and equipment	(25,031)	(27,080)
Change in other assets	(3,729)	(5,336)
Cash paid for business acquisition, net of cash acquired	0	(2,817)
Sales and maturities of investments	10,500	9,380
Net cash used in investing activities	(18,260)	(25,853)
Cash flows from financing activities:
Proceeds from employee stock plans	4,048	4,981
Income tax withholding payment associated with restricted stock vesting	(1,845)	(7,277)
Stock repurchases	25,000	0
Net cash used in financing activities	(22,797)	(2,296)
Effect of exchange rate changes on cash and cash equivalents	2,125	(103)
Net increase (decrease) in cash and cash equivalents	57,814	(59,831)
Cash and cash equivalents, at beginning of period	239,392	130,373
Cash and cash equivalents, at end of period	$ 297,206	$ 70,542

Description of Business	9 Months Ended
Description of Business	Sep. 26, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of BusinessiRobot Corporation ("iRobot" or the "Company") designs and builds robots that empower people to do more both inside and outside of the home. iRobot's consumer robots help people find smarter ways to clean and accomplish more in their daily lives. The Company's portfolio of solutions features proprietary technologies for the connected home and advanced concepts in cleaning, mapping and navigation, human-robot interaction and physical solutions. Leveraging this portfolio, our engineers are building an ecosystem of robots to empower the smart home. The Company’s revenue is primarily generated from product sales through a variety of distribution channels, including chain stores and other national retailers, through the Company's own website and app, dedicated e-commerce websites, the online arms of traditional retailers, and through value-added distributors and resellers worldwide.

Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 26, 2020
Accounting Policies [Abstract]
Unusual Risks and Uncertainties [Table Text Block]	Impact of COVID-19 The global pandemic related to the novel coronavirus ("COVID-19") has resulted in significant economic disruption. The pandemic and associated actions and measures implemented by governments around the world to slow the spread of COVID-19 have altered macroeconomic conditions and created recession-like environments around the world. These dynamics had an adverse impact on the Company's financial and operating results during the first quarter of 2020. At the same time, mandated orders to "shelter-in-place" and other social distancing measures have directly and indirectly affected sales and supply chain activities. During the second quarter of 2020, the Company observed increased demand as maintaining a clean home took on greater prominence during the pandemic with sell-through momentum building globally. The favorable demand environment continued to strengthen in the third quarter of 2020 with stronger-than-anticipated retail orders and robust growth in direct-to-consumer sales. As the global pandemic situation remains dynamic and subject to rapid and possibly material changes, additional impacts may arise of which the Company is not currently aware. The nature and extent of such impacts will depend on future developments, which are still highly uncertain. The Company will continue to actively monitor the situation and may take further actions that alter the business operations as may be required by federal, state, local or foreign authorities, or that the Company determines are in the best interests of its employees, customers, and stockholders. In light of the COVID-19 pandemic, the Company evaluated its assets for impairment, including strategic investments, goodwill and long-lived assets. The Company considered the current and expected future economic and market conditions and determined that no impairment existed as of September 26, 2020. However, the Company is unable to predict how long the pandemic will persist or the timing and speed of any economic recovery that may follow. Any measures that prolong shelter-in-place or restrict business activities are highly likely to be harmful to the consumer product retail industry in general, and consequently, to the Company's business.

Inventory

9 Months Ended

Sep. 26, 2020

Inventory Disclosure [Abstract]

Inventory

Inventory consists of the following (in thousands):


	September 26, 2020		December 28, 2019
Raw materials	$	479	$	2,825
Finished goods	217,655		154,522
	$	218,134	$	157,347

Goodwill, Other Intangible Assets and Other Assets

9 Months Ended

Sep. 26, 2020

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 nine months ended September 26, 2020 (in thousands):


Balance as of December 28, 2019	$	118,732

Effect of foreign currency translation	3,843
Balance as of September 26, 2020	$	122,575

Intangible assets consisted of the following (in thousands):


	September 26, 2020				December 28, 2019
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Completed technology	$	28,100	$	26,300	$	1,800	$	28,100	$	24,605	$	3,495
Tradename	100		100		—		100		100		—
Customer relationships	11,436		3,090		8,346		11,095		2,302		8,793
Reacquired distribution rights	33,100		33,100		—		31,680		31,680		—
Non-competition agreements	268		268		—		256		192		64
Total	$	73,004	$	62,858	$	10,146	$	71,231	$	58,879	$	12,352

Amortization expense related to acquired intangible assets was $0.5 million and $3.4 million for the three months ended September 26, 2020 and September 28, 2019, respectively. Amortization expense related to acquired intangible assets was $2.5 million and $10.1 million for the nine months ended September 26, 2020 and September 28, 2019, 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 2020	$	225	$	242	$	467
2021	900		804		1,704
2022	675		804		1,479
2023	—		804		804
2024	—		804		804
Thereafter	—		4,888		4,888
Total	$	1,800	$	8,346	$	10,146

Accrued Expenses

9 Months Ended

Sep. 26, 2020

Accrued Liabilities, Current [Abstract]

Accrued Expenses

Accrued expenses consisted of the following at (in thousands):


	September 26, 2020		December 28, 2019
Accrued bonus	$	23,575	$	12,541
Accrued compensation and benefits	18,858		13,331
Accrued warranty	14,661		13,856
Accrued sales and other indirect taxes payable	10,239		12,440
Accrued federal and state income taxes	6,511		3,378
Current portion of operating lease liabilities	6,343		6,843
Accrued direct fulfillment costs	4,330		10,582





Accrued other	10,252		8,797
	$	94,769	$	81,768

Commitments and Contingencies

9 Months Ended

Sep. 26, 2020

Commitments and Contingencies Disclosure [Abstract]

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. For the following litigation matters, a liability is not probable or the amount cannot be reasonably estimated and therefore accruals have not been made.

On October 24, 2019, purported Company shareholder Miramar Firefighters’ Pension Fund filed a putative class action in the U.S. District Court for the Southern District of New York against the Company and certain of its directors and officers, captioned Miramar Firefighters’ Pension Fund v. iRobot Corporation, et al., No. 1:19-cv-09837. The case has been transferred to the U.S. District Court for the District of Massachusetts. A similar case captioned Campbell v. iRobot Corporation, et al., No. 1:19-cv-12483 was also filed in the U.S. District Court for the Southern District of New York and subsequently transferred to the U.S. District Court for the District of Massachusetts. On January 24, 2020, the Court consolidated the Miramar and Campbell cases (the consolidated cases together, the "Securities Class Action") and appointed a lead plaintiff and lead plaintiff's Counsel. On April 3, 2020, the plaintiff filed an amended complaint alleging violations of Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 thereunder based on allegedly false and misleading statements and omissions concerning the impact of competition and Section 301 tariffs on the Company’s financial performance, and the Company has filed a motion to dismiss the case. A hearing was held on the Company’s motion to dismiss on September 17, 2020, and the Company is currently awaiting a ruling on its motion to dismiss.

On December 20, 2019, purported Company shareholders David Katz and Thomas Wightman, derivatively on behalf of iRobot Corporation, filed a complaint in the U.S. District Court for Southern District of New York against the Company and certain of its directors and officers, captioned David Katz and Thomas Wightman, on behalf of iRobot Corporation v. iRobot Corporation, et al., No. 1:19-cv-11692. The complaint alleges breaches of fiduciary duties, unjust enrichment, violations of Sections 10(b) and 20(a) of the Exchange Act and Rule 10b-5 thereunder based on allegedly false and misleading statements and omissions concerning the Company's acquisitions of Sales on Demand Corporation and Robopolis SAS and the Company's subsequent financial performance. The complaint seeks, among other things, unspecified compensatory damages, including interest, in connection with the Company's allegedly inflated stock price, attorneys' fees and costs, and unspecified equitable/injunctive relief. This case has been transferred to the U.S. District Court for the District of Massachusetts. Similarly, additional derivative litigations -- namely: Robert Truman, on behalf of iRobot Corporation v. iRobot Corporation, et al., No. 1:20-cv-10034; Alexa Ruhfass, on behalf of iRobot Corporation v. iRobot Corporation, et al., No. 1:20-cv-10133; and William Tasco, derivatively on behalf of iRobot Corporation v. iRobot Corporation, et al., No. 1:20-cv-10253 - were filed in the U.S. District Court for the District of Massachusetts. All of these cases have been consolidated in a case captioned as In re iRobot Corporation Derivative litigation, No. 1:20-cv-10034, and have been stayed pending a ruling on the motion to dismiss in the Securities Class Action.

Outstanding Purchase Orders

At September 26, 2020, the Company had outstanding purchase orders aggregating approximately $301.3 million. The purchase orders, the majority of which are with the Company's 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 cancellable without penalty. In circumstances where the Company has determined 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 September 26, 2020 and December 28, 2019, 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				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Balance at beginning of period	$	13,769	$	11,970	$	13,856	$	11,964

Provision	5,525		3,484		13,395		8,817
Warranty usage	(4,633)		(3,082)		(12,590)		(8,409)
Balance at end of period	$	14,661	$	12,372	$	14,661	$	12,372

Industry Segment, Geographic Information and Significant Customers	9 Months Ended
	Sep. 26, 2020
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 a variety of distribution channels, including chain stores and other national retailers, through the Company's own website and app, dedicated e-commerce websites, the online arms of traditional retailers, and through value-added distributors and resellers worldwide. Significant Customers For the three months ended September 26, 2020 and September 28, 2019, the Company generated 26.6% and 29.6% of total revenue, respectively, from one of its retailers (Amazon). For the nine months ended September 26, 2020 and September 28, 2019, the Company generated 26.4% and 25.0% of total revenue, respectively, from one of its retailers (Amazon).

Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 26, 2020

Accounting Policies [Abstract]

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 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 28, 2019, filed with the Securities and Exchange Commission on February 13, 2020.

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.

Recent Accounting Pronouncements

Recently Adopted Accounting Standards

In June 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("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. The Company adopted the standard effective December 29, 2019 which resulted in no adjustment to the allowance for credit losses upon adoption. See the description of the Company’s "Credit Losses" accounting policy below.

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 Company adopted this standard effective December 29, 2019 which did not have a material impact on the Company's consolidated financial statements and related disclosures.

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 Company adopted the standard using the prospective method effective December 29, 2019 which did not have a material impact on the Company's consolidated financial statements.

Recently Issued Accounting Standards

In December 2019, the FASB issued ASU No. 2019-12, "Income Taxes - Simplifying the Accounting for Income Taxes." The ASU simplifies the accounting for income taxes by removing certain exceptions to the general principles as well as clarifying and amending existing guidance to improve consistent application. The amendments to this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020, with early adoption permitted. Depending on the amendment, adoption may be applied on the retrospective, modified retrospective or prospective basis. The Company intends to adopt the ASU effective January 3, 2021, and is currently evaluating the impact to the 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.

Use of Estimates

Use of EstimatesThe 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; allowance for credit losses; 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.

Credit Loss, Financial Instrument [Policy Text Block]

Credit Losses

The Company is exposed to credit losses primarily through sales of its products. The Company assesses each customer's ability to pay by conducting a credit review which includes consideration of established credit ratings or an internal assessment of the customer's creditworthiness based on an analysis of their financial information when a credit rating is not available. The Company monitors the credit exposure through active review of customer balances. The Company's expected loss methodology for accounts receivable is developed using historical collection experience, current customer credit ratings, current and future economic and market conditions and a review of the current status of customers' account balances. Although the Company historically has not experienced significant credit losses as it relates to trade accounts receivable, the COVID-19 pandemic has caused uncertainty in some customer accounts. The Company recorded its estimate of credit losses, resulting in an increase to the reserve and bad debt expense, of $1.0 million and $5.5 million during the three and nine months ended September 26, 2020, respectively. As of September 26, 2020 and December 28, 2019, the Company had an allowance for credit losses of $6.5 million and $1.2 million, respectively.

The Company's exposure to credit losses may increase if its customers are adversely affected by changes in economic pressures or uncertainty associated with local or global economic recessions or other customer-specific factors. It is possible that there could be a material adverse impact to the carrying amount of accounts receivables if the liquidity of retailers, resellers and distributors continues to be impacted by disruptions related to the COVID-19 pandemic

Investment, Policy [Policy Text Block]

Strategic InvestmentsThe Company holds non-marketable equity securities as part of its strategic investments portfolio. The Company classifies the majority of these securities as equity securities without readily determinable fair values and measures these investments at cost, less any impairment, adjusted for observable price changes.

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				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Net income	$	93,252	$	35,532	$	133,733	$	65,259
Basic weighted-average common shares outstanding	28,031		28,154		28,084		28,029
Dilutive effect of employee stock awards	508		496		418		730
Diluted weighted-average common shares outstanding	28,539		28,650		28,502		28,759
Net income per share - Basic	$	3.33	$	1.26	$	4.76	$	2.33
Net income per share - Diluted	$	3.27	$	1.24	$	4.69	$	2.27

Employee stock awards representing approximately 0.1 million and 0.4 million shares of common stock for the three months ended September 26, 2020 and September 28, 2019, respectively, and approximately 0.2 million and 0.1 million shares of common stock for the nine months ended September 26, 2020 and September 28, 2019, respectively, were excluded from the computation of diluted earnings per share as their effect would have been antidilutive.

Inventory (Tables)

9 Months Ended

Sep. 26, 2020

Inventory Disclosure [Abstract]

Components of Inventory

Inventory

Inventory consists of the following (in thousands):


	September 26, 2020		December 28, 2019
Raw materials	$	479	$	2,825
Finished goods	217,655		154,522
	$	218,134	$	157,347

Goodwill, Other Intangible Assets and Other Assets (Tables)

9 Months Ended

Sep. 26, 2020

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 nine months ended September 26, 2020 (in thousands):


Balance as of December 28, 2019	$	118,732

Effect of foreign currency translation	3,843
Balance as of September 26, 2020	$	122,575

Other Intangible Assets

Intangible assets consisted of the following (in thousands):


	September 26, 2020				December 28, 2019
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Completed technology	$	28,100	$	26,300	$	1,800	$	28,100	$	24,605	$	3,495
Tradename	100		100		—		100		100		—
Customer relationships	11,436		3,090		8,346		11,095		2,302		8,793
Reacquired distribution rights	33,100		33,100		—		31,680		31,680		—
Non-competition agreements	268		268		—		256		192		64
Total	$	73,004	$	62,858	$	10,146	$	71,231	$	58,879	$	12,352

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 2020	$	225	$	242	$	467
2021	900		804		1,704
2022	675		804		1,479
2023	—		804		804
2024	—		804		804
Thereafter	—		4,888		4,888
Total	$	1,800	$	8,346	$	10,146

Accrued Expenses (Tables)

9 Months Ended

Sep. 26, 2020

Accrued Liabilities, Current [Abstract]

Components of Accrued Expenses


	September 26, 2020		December 28, 2019
Accrued bonus	$	23,575	$	12,541
Accrued compensation and benefits	18,858		13,331
Accrued warranty	14,661		13,856
Accrued sales and other indirect taxes payable	10,239		12,440
Accrued federal and state income taxes	6,511		3,378
Current portion of operating lease liabilities	6,343		6,843
Accrued direct fulfillment costs	4,330		10,582





Accrued other	10,252		8,797
	$	94,769	$	81,768

Commitments and Contingencies (Tables)

9 Months Ended

Sep. 26, 2020

Commitments and Contingencies Disclosure [Abstract]

Activity related to the warranty accrual was as follows (in thousands):


	Three Months Ended				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Balance at beginning of period	$	13,769	$	11,970	$	13,856	$	11,964

Provision	5,525		3,484		13,395		8,817
Warranty usage	(4,633)		(3,082)		(12,590)		(8,409)
Balance at end of period	$	14,661	$	12,372	$	14,661	$	12,372

Industry Segment, Geographic Information and Significant Customers (Tables)	9 Months Ended
	Sep. 26, 2020
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 Accounting Policies - Basic and Diluted Net Income Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Document Period End Date			Sep. 26, 2020
Net income	$ 93,252	$ 35,532	$ 133,733	$ 65,259
Weighted-average shares outstanding	28,031	28,154	28,084	28,029
Dilutive effect of employee stock options and restricted shares	508	496	418	730
Diluted weighted-average shares outstanding	28,539	28,650	28,502	28,759
Basic income per share	$ 3.33	$ 1.26	$ 4.76	$ 2.33
Diluted income per share	$ 3.27	$ 1.24	$ 4.69	$ 2.27
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	100	400	200	100

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Goodwill, Other Intangible Assets and Other Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 28, 2019
Business Acquisition [Line Items]
Goodwill	$ 122,575		$ 122,575		$ 118,732
Amortization of Acquired Intangible Assets	$ 500	$ 3,400	$ 2,500	$ 10,100

Commitments and Contingencies - Additional Information (Detail) $ in Millions	Sep. 26, 2020 USD ($)
Outstanding POs [Abstract]
Contractual Obligation	$ 301.3

Commitments and Contingencies - Activity Related to Warranty Accrual (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 13,769	$ 11,970	$ 13,856	$ 11,964
Provision	5,525	3,484	13,395	8,817
Warranty usage	(4,633)	(3,082)	(12,590)	(8,409)
Balance at end of period	$ 14,661	$ 12,372	$ 14,661	$ 12,372

Industry Segment, Geographic Information and Significant Customers - Additional Information (Detail) - segment	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Reportable Segments			1
Document Period End Date			Sep. 26, 2020
Revenue Benchmark [Member] \| Amazon [Member] \| Customer Concentration Risk [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	26.60%	29.60%	26.40%	25.00%

Revenue Recognition (Notes)

9 Months Ended

Sep. 26, 2020

Revenue Recognition and Deferred Revenue [Abstract]

Revenue from Contract with Customer [Text Block]

Revenue RecognitionThe 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. Revenue is recognized only to the extent that it is

probable that a significant reversal of revenue will not occur. 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 certain 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 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 September 26, 2020 is $7.3 million. 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 or two-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."

The Company provides limited rights of returns for direct-to-consumer sales generated through its on-line stores and certain resellers and distributors. The Company records an allowance for product returns based on specific terms and conditions included in the customer agreements or based on historical experience and the Company's expectation of future returns. In addition, the Company may provide other credits or incentives 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 forecasted inventory level in the channels. 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 September 26, 2020, the Company has reserves for product returns of $51.5 million and other credits and incentives of $86.6 million. As of December 28, 2019, the Company had reserves for product returns of $55.2 million and other credits and incentives of $134.0 million. Revenue recognized during the three and nine months ended September 26, 2020 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				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
United States	$	206,276	$	117,929	$	428,389	$	356,466
EMEA	114,477		93,688		252,184		251,150
Other	92,392		77,782		204,990		179,616
Total revenue	$	413,145	$	289,399	$	885,563	$	787,232

Contract Balances

The following table provides information about receivables and contract liabilities from contracts with customers (in thousands):


	September 26, 2020		December 28, 2019
Accounts receivable, net	$	179,709	$	146,161
Contract liabilities	12,063		6,991

The Company invoices customers based upon contractual billing schedules, and accounts receivable are recorded when the right to consideration becomes unconditional. Contract liabilities include deferred revenue associated with the Cloud Services as well as 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 September 26, 2020 and September 28, 2019, the Company recognized $1.8 million and $1.7 million, respectively, of the contract liability balance as revenue upon transfer of the products or services to customers. During the nine months ended September 26, 2020 and September 28, 2019, the Company recognized $4.6 million and $5.8 million, respectively, of the contract liability balance as revenue upon transfer of the products or services to customers.

Leases (Notes)

9 Months Ended

Sep. 26, 2020

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 marketing 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 new leases post adoption. At September 26, 2020, the Company's weighted average discount rate was 3.56%, while the weighted average remaining lease term was 8.50 years.

The components of lease expense were as follows (in thousands):


	Three Months Ended				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Operating lease cost	$	2,287	$	2,250	$	6,932	$	6,539
Variable lease cost	823		828		2,827		2,965
Total lease cost	$	3,110	$	3,078	$	9,759	$	9,504

Supplemental cash flow information related to leases was as follows (in thousands):


	Three Months Ended				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	2,750	$	2,566	$	7,516	$	7,447
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	744	$	460	$	2,310	$	53,227

Maturities of operating lease liabilities were as follows as of September 26, 2020 (in thousands):



Remainder of 2020	$	1,613
2021	8,845
2022	8,564
2023	7,592
2024	6,535
Thereafter	35,017
Total minimum lease payments	$	68,166
Less: imputed interest	9,926
Present value of future minimum lease payments	$	58,240
Less: current portion of operating lease liabilities (Note 7)	6,343
Long-term lease liabilities	$	51,897

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.

Derivative Instruments (Notes)

9 Months Ended

Sep. 26, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives Not Designated as Hedging Instruments [Table Text Block]

Gains (losses) associated with derivative instruments not designated as hedging instruments are as follows (in thousands):


		Three Months Ended				Nine Months Ended
	Classification	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Gain (loss) recognized in income	Other income, net	$	(2,232)	$	852	$	(3,475)	$	200

Derivative Instruments and Hedging Activities Disclosure [Text Block]

Derivative InstrumentsThe 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 British Pound, Canadian Dollar, Euro and Japanese Yen. 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. These contracts typically have maturities of thirty-seven months or less. At September 26, 2020 and December 28, 2019, the Company had outstanding cash flow hedges with a total notional value of $430.2 million and $424.6 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 twelve months or less. At September 26, 2020 and December 28, 2019, the Company had outstanding foreign currency economic hedges with a total notional value of $26.8 million and $58.4 million, respectively.

As described in Note 2, during July 2020, the Company entered into a forward sale contract as an economic hedge to reduce the Company's exposure to stock price fluctuations on its marketable equity securities. The contract has a maturity date of January 2021. At September 26, 2020, the total notional value of this economic hedge was $51.5 million.

The fair values of derivative instruments are as follows (in thousands):


		Fair Value
	Classification		September 26, 2020		December 28, 2019
Derivatives not designated as hedging instruments:

Foreign currency forward contracts	Other current assets		$	724	$	1,855
Foreign currency forward contracts	Accrued expenses		1,177		297
Forward sale contract	Accrued expenses		626		—
Derivatives designated as cash flow hedges:
Foreign currency forward contracts	Other current assets		$	2,781	$	4,347
Foreign currency forward contracts	Other assets		3,136		9,112
Foreign currency forward contracts	Accrued expenses		435		47
Foreign currency forward contracts	Long-term liabilities		3,689		414

Gains (losses) associated with derivative instruments not designated as hedging instruments are as follows (in thousands):


		Three Months Ended				Nine Months Ended
	Classification	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Gain (loss) recognized in income	Other income, net	$	(2,232)	$	852	$	(3,475)	$	200

The following tables reflect the effect of derivatives designated as cash flow hedging (in thousands):


	Gain (loss) recognized in OCI on Derivative (1)
	Three Months Ended				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Foreign currency forward contracts	$	(11,230)	$	10,905	$	(7,177)	$	15,254

(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				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
	Revenue				Revenue
Consolidated statements of operations in which the effects of cash flow hedging instruments are recorded	$	413,145	$	289,399	$	885,563	$	787,232

Gain (loss) on cash flow hedging relationships:
Foreign currency forward contracts:
Amount of gain reclassified from AOCI into earnings	$	993	$	185	$	4,711	$	400

Fair Value Measurements (Notes)

9 Months Ended

Sep. 26, 2020

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 were as follows (in thousands):


	Fair Value Measurements as of September 26, 2020
	Level 1		Level 2 (1)		Level 3 (2)
Assets:
Money market funds	$	74,058	$	—	$	—
Marketable equity securities, $46,578 at cost (3)	52,106		—		—
Corporate bonds, $6,493 at cost (4)	—		6,524		—
Convertible notes	—		—		1,500
Derivative instruments (Note 8)	—		6,641		—
Total assets measured at fair value	$	126,164	$	13,165	$	1,500

Liabilities:
Derivative instruments (Note 8)	$	—	$	5,927	$	—
Total liabilities measured at fair value	$	—	$	5,927	$	—


	Fair Value Measurements as of December 28, 2019
	Level 1		Level 2 (1)		Level 3 (2)
Assets:

Corporate and government bonds, $17,016 at cost	$	—	$	17,032	$	—

Derivative instruments (Note 8)	—		15,314		—
Total assets measured at fair value	$	—	$	32,346	$	—

Liabilities:
Derivative instruments (Note 8)	$	—	$	758	$	—
Total liabilities measured at fair value	$	—	$	758	$	—

(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. Unobservable inputs used in the models are significant to the fair values of the assets and liabilities.

(3)The related unrealized gain recorded in Other income, net was $5.5 million for the three months ended September 26, 2020. Marketable equity securities are included in short term investments on the consolidated balance sheet.

(4)As of September 26, 2020, the Company’s investments had maturity dates ranging from November 2020 to March 2021.

The following table provides a summary of changes in fair value of our Level 3 investment for the nine months ended September 26, 2020 (in thousands):


Balance as of December 28, 2019	$	—
Investment in convertible notes	1,500
Balance as of September 26, 2020	$	1,500

Convertible Debt [Table Text Block]

The following table provides a summary of changes in fair value of our Level 3 investment for the nine months ended September 26, 2020 (in thousands):


Balance as of December 28, 2019	$	—
Investment in convertible notes	1,500
Balance as of September 26, 2020	$	1,500

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Stockholders Equity (Notes)	9 Months Ended
Stockholders Equity (Notes)	Sep. 26, 2020
Equity [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	Stockholders' Equity Share Repurchase Activity The Company's Board of Directors approved a stock repurchase program authorizing up to $200.0 million in share repurchases from time to time until September 2021. On March 10, 2020, the Company entered into a Rule 10b5-1 plan to repurchase $25.0 million of common stock in the aggregate beginning March 13, 2020 and ending April 30, 2020. The Company repurchased 663,602 shares of its common stock at an average price of $37.65, totaling $25.0 million in March 2020.

Income Taxes (Notes)	9 Months Ended
Income Taxes (Notes)	Sep. 26, 2020
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes The Company’s effective income tax rate for the three months ended September 26, 2020 and September 28, 2019, was 24.3% and 18.2%, respectively. The increase in the effective income tax rate was primarily due to the jurisdictional profit mix and the impact of valuation allowances. The Company’s effective income tax rate for the nine months ended September 26, 2020 and September 28, 2019, was 22.6% and 11.6%, respectively. The increase in the effective income tax rate was primarily due to the recognition of tax expense associated with stock-based compensation compared to a tax benefit for the prior period. The Company's effective income tax rate of 24.3% and 22.6% for the three and nine months ended September 26, 2020 differed from the federal statutory tax rate of 21% primarily due to the jurisdictional mix of earnings and the recognition of valuation allowances during the period. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act") was enacted in response to the COVID-19 pandemic. The Company continues to evaluate the impact of the CARES Act, but at present does not expect the CARES Act to result in any material income tax benefit.

Revenue Recognition Disaggregation of Revenue (Tables)

9 Months Ended

Sep. 26, 2020

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				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
United States	$	206,276	$	117,929	$	428,389	$	356,466
EMEA	114,477		93,688		252,184		251,150
Other	92,392		77,782		204,990		179,616
Total revenue	$	413,145	$	289,399	$	885,563	$	787,232

Revenue Recognition Contract Balances (Tables)

9 Months Ended

Sep. 26, 2020

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):


	September 26, 2020		December 28, 2019
Accounts receivable, net	$	179,709	$	146,161
Contract liabilities	12,063		6,991

Leases (Tables)

9 Months Ended

Sep. 26, 2020

Operating Lease Cost [Abstract]

Lease, Cost [Table Text Block]

The components of lease expense were as follows (in thousands):


	Three Months Ended				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Operating lease cost	$	2,287	$	2,250	$	6,932	$	6,539
Variable lease cost	823		828		2,827		2,965
Total lease cost	$	3,110	$	3,078	$	9,759	$	9,504

Schedule of Leases, Supplemental Cash Flow [Table Text Block]

Supplemental cash flow information related to leases was as follows (in thousands):


	Three Months Ended				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	2,750	$	2,566	$	7,516	$	7,447
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	744	$	460	$	2,310	$	53,227

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Maturities of operating lease liabilities were as follows as of September 26, 2020 (in thousands):



Remainder of 2020	$	1,613
2021	8,845
2022	8,564
2023	7,592
2024	6,535
Thereafter	35,017
Total minimum lease payments	$	68,166
Less: imputed interest	9,926
Present value of future minimum lease payments	$	58,240
Less: current portion of operating lease liabilities (Note 7)	6,343
Long-term lease liabilities	$	51,897

Derivative Instruments (Tables)

9 Months Ended

Sep. 26, 2020

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				Nine Months Ended
	Classification	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Gain (loss) recognized in income	Other income, net	$	(2,232)	$	852	$	(3,475)	$	200

The following tables reflect the effect of derivatives designated as cash flow hedging (in thousands):


	Gain (loss) recognized in OCI on Derivative (1)
	Three Months Ended				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Foreign currency forward contracts	$	(11,230)	$	10,905	$	(7,177)	$	15,254

(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				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
	Revenue				Revenue
Consolidated statements of operations in which the effects of cash flow hedging instruments are recorded	$	413,145	$	289,399	$	885,563	$	787,232

Gain (loss) on cash flow hedging relationships:
Foreign currency forward contracts:
Amount of gain reclassified from AOCI into earnings	$	993	$	185	$	4,711	$	400

Derivative Instruments Schedule of Derivative Instruments (Tables)

9 Months Ended

Sep. 26, 2020

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 (in thousands):


	Gain (loss) recognized in OCI on Derivative (1)
	Three Months Ended				Nine Months Ended
	September 26, 2020		September 28, 2019		September 26, 2020		September 28, 2019
Foreign currency forward contracts	$	(11,230)	$	10,905	$	(7,177)	$	15,254

(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		September 26, 2020		December 28, 2019
Derivatives not designated as hedging instruments:

Foreign currency forward contracts	Other current assets		$	724	$	1,855
Foreign currency forward contracts	Accrued expenses		1,177		297
Forward sale contract	Accrued expenses		626		—
Derivatives designated as cash flow hedges:
Foreign currency forward contracts	Other current assets		$	2,781	$	4,347
Foreign currency forward contracts	Other assets		3,136		9,112
Foreign currency forward contracts	Accrued expenses		435		47
Foreign currency forward contracts	Long-term liabilities		3,689		414

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41620-113959

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41638-113959

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41641-113959

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579240-113959

+ Details

Summary of Significant Accounting Policies Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 26, 2020	Sep. 26, 2020	Dec. 28, 2019
Credit Loss [Abstract]
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ 1.0	$ 5.5
Accounts Receivable, Allowance for Credit Loss	$ 6.5	$ 6.5	$ 1.2

Summary of Significant Accounting Policies Receivables (Details) - USD ($)	9 Months Ended
	Sep. 26, 2020	Apr. 24, 2020
Receivables [Abstract]
Recovery of Direct Costs	$ 40,000,000.0
Receivable for Recovery of Import Duties, Net	25,400,000	$ 60,300,000
Proceeds from recovery of import duties	$ 34,900,000

Summary of Significant Accounting Policies Other Assets (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Jul. 01, 2020	Sep. 26, 2020	Sep. 26, 2020	Dec. 28, 2019
Equity and cost method investments [Abstract]
Equity Securities without Readily Determinable Fair Value, Amount		$ 15,300	$ 15,300	$ 21,000
Equity Securities, FV-NI, Restricted		52,100	52,100
Equity Securities, FV-NI, Unrealized Gain		$ 4,900	$ 5,500
Gain (Loss) on Sale of Equity Investments	$ 38,600

Summary of Significant Accounting Policies Subsequent Event (Details) - USD ($) shares in Millions		9 Months Ended
	Jul. 01, 2020	Sep. 26, 2020
Subsequent Event [Line Items]
Equity securities received, restricted	0.2
Gain (Loss) on Sale of Equity Investments	$ 38,600,000
Proceeds from recovery of import duties		$ 34,900,000

Revenue Recognition Significant Judgments (Details) - USD ($) $ in Millions	Sep. 26, 2020	Dec. 28, 2019
Revenue Recognition and Deferred Revenue [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 7.3
Refund liability, product returns	51.5	$ 55.2
Refund liability, other credits and incentives	$ 86.6	$ 134.0

Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 413,145	$ 289,399	$ 885,563	$ 787,232
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	206,276	117,929	428,389	356,466
EMEA [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	114,477	93,688	252,184	251,150
All Other Regions [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 92,392	$ 77,782	$ 204,990	$ 179,616

Revenue Recognition Contract Balances (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 28, 2019
Revenue Recognition and Deferred Revenue [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 7,300		$ 7,300
Accounts Receivable, after Allowance for Credit Loss, Current	179,709		179,709		$ 146,161
Contract with Customer, Liability, Revenue Recognized	1,800	$ 1,700	4,600	$ 5,800
Contract with Customer, Liability	$ 12,063		$ 12,063		$ 6,991

Leases Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Leases Lease Cost (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Leases [Abstract]
Operating Lease, Weighted Average Discount Rate, Percent	3.56%		3.56%
Operating Lease, Cost	$ 2,287	$ 2,250	$ 6,932	$ 6,539
Variable Lease, Cost	823	828	2,827	2,965
Lease, Cost	$ 3,110	$ 3,078	$ 9,759	$ 9,504
Operating Lease, Weighted Average Remaining Lease Term	8 years 6 months		8 years 6 months

Leases Supplemental Cash Flow (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Leases [Abstract]
Document Period End Date			Sep. 26, 2020
Operating Lease, Payments	$ 2,750	$ 2,566	$ 7,516	$ 7,447
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 744	$ 460	$ 2,310	$ 53,227

Leases Maturity of Operating Lease LIability (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019	Dec. 30, 2018
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 1,613
Lessee, Operating Lease, Liability, Payments, Due Year Two	8,845
Lessee, Operating Lease, Liability, Payments, Due Year Three	8,564
Lessee, Operating Lease, Liability, Payments, Due Year Four	7,592
Lessee, Operating Lease, Liability, Payments, Due Year Five	6,535
Lessee, Operating Lease, Liability, Payments, Due after Year Five	35,017
Lessee, Operating Lease, Liability, Payments, Due	68,166
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	9,926
Operating Lease, Liability	58,240		$ 67,300
Current portion of operating lease liabilities	6,343	$ 6,843
Operating Lease, Liability, Noncurrent	$ 51,897	$ 54,928

Leases Financial Statement Impact of Adopting ASC 842 (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019	Dec. 30, 2018
Leases [Abstract]
Operating lease right-of-use asset	$ 45,186	$ 47,478	$ 52,800
Operating Lease, Liability	$ 58,240		$ 67,300

Inventory (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Inventory Disclosure [Abstract]
Inventory, Raw Materials, Net of Reserves	$ 479	$ 2,825
Inventory, Finished Goods, Net of Reserves	217,655	154,522
Inventory	$ 218,134	$ 157,347

Goodwill, Other Intangible Assets and Other Assets - Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 28, 2019
Finite-Lived Intangible Assets [Line Items]
Document Period End Date			Sep. 26, 2020
Finite-Lived Intangible Assets, Gross	$ 73,004		$ 73,004		$ 71,231
Intangible assets accumulated amortization	62,858		62,858		58,879
Intangible Assets, Net	10,146		10,146		12,352
Amortization of Acquired Intangible Assets	500	$ 3,400	2,500	$ 10,100
Completed technology
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	28,100		28,100		28,100
Intangible assets accumulated amortization	26,300		26,300		24,605
Intangible Assets, Net	1,800		1,800		3,495
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	11,436		11,436		11,095
Intangible assets accumulated amortization	3,090		3,090		2,302
Intangible Assets, Net	8,346		8,346		8,793
Distribution Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	33,100		33,100		31,680
Intangible assets accumulated amortization	33,100		33,100		31,680
Intangible Assets, Net	0		0		0
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	268		268		256
Intangible assets accumulated amortization	268		268		192
Intangible Assets, Net	$ 0		$ 0		$ 64

Goodwill, Other Intangible Assets and Other Assets Schedule of goodwill (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2020	Dec. 28, 2019
Goodwill [Line Items]
Goodwill	$ 122,575	$ 118,732
Goodwill, Foreign Currency Translation Gain (Loss)	$ 3,843

Goodwill, Other Intangible Assets and Other Assets Finite-lived intangible assets, schedule of future amortization (Details) $ in Thousands	Sep. 26, 2020 USD ($)
Finite-lived intangible assets, schedule of amortization expense [Line Items]
Remainder of 2020	$ 467
2021	1,704
2022	1,479
2023	804
2024	804
Thereafter	4,888
Total	10,146
Cost of revenue
Finite-lived intangible assets, schedule of amortization expense [Line Items]
Remainder of 2020	225
2021	900
2022	675
2023	0
2024	0
Thereafter	0
Total	1,800
Operating Expense [Member]
Finite-lived intangible assets, schedule of amortization expense [Line Items]
Remainder of 2020	242
2021	804
2022	804
2023	804
2024	804
Thereafter	4,888
Total	$ 8,346

Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Accounts Payable, Current [Abstract]
Accrued compensation and benefits	$ 18,858	$ 13,331
Accrued warranty	14,661	13,856
Accrued bonus	23,575	12,541
Current portion of operating lease liabilities	6,343	6,843
Accrued direct fulfillment costs	4,330	10,582
Accrued sales and other indirect taxes payable	10,239	12,440
Accrued federal and state income taxes	6,511	3,378
Accrued other	10,252	8,797
Accrued expenses	$ 94,769	$ 81,768

Derivative Instruments Schedule of Derivative Instruments (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 26, 2020

Sep. 28, 2019

Sep. 26, 2020

Sep. 28, 2019

Dec. 28, 2019

Derivative [Line Items]

Document Period End Date

Sep. 26, 2020

Revenue

$ 413,145

$ 289,399

$ 885,563

$ 787,232

Total cost of revenue

214,304

152,558

430,755

412,675

Designated as Hedging Instrument [Member]

Derivative [Line Items]

Derivative, Notional Amount

430,200

$ 424,600

Not Designated as Hedging Instrument [Member]

Derivative [Line Items]

Derivative, Notional Amount

26,800

58,400

Not Designated as Hedging Instrument [Member] | Equity Securities [Member]

Derivative [Line Items]

Derivative, Notional Amount

51,500

Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]

Derivative [Line Items]

Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion

^[1]

(11,230)

10,905

(7,177)

15,254

Other Nonoperating Income (Expense) [Member]

Derivative [Line Items]

Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net

(2,232)

$ 852

(3,475)

$ 200

Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member] | Foreign Exchange Forward [Member]

Derivative [Line Items]

Derivative Liability

1,177

297

Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member] | Derivative, Forward Price

Derivative [Line Items]

Derivative Liability

626

Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Foreign Exchange Forward [Member]

Derivative [Line Items]

Derivative Asset

724

1,855

Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Accrued Liabilities [Member] | Foreign Exchange Forward [Member]

Derivative [Line Items]

Derivative Liability

435

Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Noncurrent Liabilities [Member] | Foreign Exchange Forward [Member]

Derivative [Line Items]

Derivative Liability

3,689

414

Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Current Assets [Member] | Foreign Exchange Forward [Member]

Derivative [Line Items]

Derivative Asset

2,781

4,347

Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Noncurrent Assets [Member] | Foreign Exchange Forward [Member]

Derivative [Line Items]

Derivative Asset

$ 3,136

$ 9,112

[1]	The amount represents the change in fair value of derivative contracts due to changes in spot rates.

Derivative Instruments (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 26, 2020

Sep. 28, 2019

Sep. 26, 2020

Sep. 28, 2019

Derivative Instruments, Gain (Loss) [Line Items]

Document Period End Date

Sep. 26, 2020

Revenue

$ 413,145

$ 289,399

$ 885,563

$ 787,232

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]

(11,230)

10,905

(7,177)

15,254

Foreign Exchange Forward [Member] | Sales [Member] | Cash Flow Hedging [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

$ 993

$ 185

$ 4,711

$ 400

[1]	The amount represents the change in fair value of derivative contracts due to changes in spot rates.

Fair Value Measurements Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 26, 2020

Dec. 28, 2019

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

$ 1,500

$ 0

conversion of debt

1,500

Equity Securities, FV-NI, Unrealized Gain

4,900

5,500

Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Money Market Funds, at Carrying Value

74,058

Equity Securities [Member]

^[1]

52,106

Available-for-sale Securities

^[2]

Convertible Debt, Fair Value Disclosures

Derivative Asset

Assets, Fair Value Disclosure

126,164

Derivative Liability

Financial and Nonfinancial Liabilities, Fair Value Disclosure

Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Money Market Funds, at Carrying Value

^[3]

Equity Securities [Member]

^[3]

Available-for-sale Securities

^[3]

6,524

^[2]

6,524

^[2]

17,032

Convertible Debt, Fair Value Disclosures

^[3]

Derivative Asset

^[3]

6,641

15,314

Assets, Fair Value Disclosure

^[3]

13,165

32,346

Derivative Liability

^[3]

5,927

758

Financial and Nonfinancial Liabilities, Fair Value Disclosure

^[3]

5,927

758

Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Money Market Funds, at Carrying Value

^[4]

Equity Securities [Member]

Available-for-sale Securities

^[4]

^[2]

Convertible Debt, Fair Value Disclosures

^[4]

1,500

Derivative Asset

^[4]

Assets, Fair Value Disclosure

^[4]

1,500

Derivative Liability

^[4]

Financial and Nonfinancial Liabilities, Fair Value Disclosure

$ 0

^[4]

[1]	The related unrealized gain recorded in Other income, net was $5.5 million for the three months ended September 26, 2020. Marketable equity securities are included in short term investments on the consolidated balance sheet.
[2]	As of September 26, 2020, the Company’s investments had maturity dates ranging from November 2020 to March 2021.
[3]	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.
[4]	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. Unobservable inputs used in the models are significant to the fair values of the assets and liabilities.(3)The related unrealized gain recorded in Other income, net was $5.5 million for the three months ended September 26, 2020. Marketable equity securities are included in short term investments on the consolidated balance sheet.

Stockholders Equity (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Stockholders Equity (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Sep. 26, 2020
Equity [Abstract]
Stock Repurchase Program, Authorized Amount	$ 25,000
Stock Repurchased and Retired During Period, Shares	663,602	664,000
Stock Repurchased and Retired During Period, Value	$ 25,000	$ 25,000

Income Taxes (Details)	3 Months Ended		9 Months Ended
Income Taxes (Details)	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Percent	24.30%	18.20%	22.60%	11.60%

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		9 Months Ended
	Sep. 26, 2020 USD ($)	Sep. 28, 2019 USD ($)	Sep. 26, 2020 USD ($) segment	Sep. 28, 2019 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of Reportable Segments \| segment			1
Total cost of revenue	$ 214,304	$ 152,558	$ 430,755	$ 412,675
Gross profit	198,841	136,841	454,808	374,557
Research and development	38,613	33,401	111,929	104,320
Selling and marketing	50,488	42,257	136,144	137,502
General and administrative	28,490	18,372	74,919	61,871
Other income, net	$ 42,240	$ 900	$ 41,837	$ 3,713
Amazon [Member] \| Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Concentration Risk, Percentage	26.60%	29.60%	26.40%	25.00%