iRobot (IRBT) 10-Q 2 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 29, 2014	Apr. 29, 2014
Entity Information [Line Items]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	29-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Trading Symbol	'IRBT	'
Entity Registrant Name	'IROBOT CORP	'
Entity Central Index Key	'0001159167	'
Current Fiscal Year End Date	'--12-27	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	29,479,815

Consolidated_Balance_Sheets_Un

Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 29, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$154,824	$165,404
Short term investments	30,540	21,954
Accounts receivable, net of allowance of $67 at March 29, 2014 and December 28, 2013	36,540	39,348
Unbilled revenue	931	856
Inventory	41,390	46,107
Deferred tax assets	19,950	20,144
Other current assets	10,436	6,848
Total current assets	294,611	300,661
Property and equipment, net	25,119	23,661
Deferred tax assets	10,433	10,095
Goodwill	48,751	48,751
Finite-Lived Intangible Assets, Net	21,764	22,668
Other assets	10,501	10,501
Total assets	411,179	416,337
Current liabilities:	'	'
Accounts payable	34,221	41,344
Accrued expenses	13,563	14,880
Employee-related Liabilities, Current	7,744	19,606
Deferred Revenue, Current	4,420	5,085
Total current liabilities	59,948	80,915
Long term liabilities	4,414	4,733
Commitments and contingencies (Note 6)	'	'
Redeemable convertible preferred stock, 5,000,000 shares authorized and none outstanding	0	0
Common stock, $0.01 par value, 100,000,000 shares authorized; 29,435,149 and 28,935,253 shares issued and outstanding at March 29, 2014 and December 28, 2013, respectively	294	289
Additional paid-in capital	238,154	227,175
Retained earnings	108,358	103,078
Accumulated other comprehensive income	11	147
Total stockholders' equity	346,817	330,689
Total liabilities, redeemable convertible preferred stock and stockholders' equity	$411,179	$416,337

Consolidated_Balance_Sheets_Un1

Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Mar. 29, 2014	Dec. 28, 2013
In Thousands, except Share data, unless otherwise specified
Net allowances on Accounts receivables	$67	$67
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	29,435,149	28,935,253
Common stock, shares outstanding	29,435,149	28,935,253

Consolidated_Statements_of_Inc

Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Revenue:	'	'
Total revenue	$114,204	$106,195
Cost of revenue:	'	'
Total cost of revenue	62,494	59,668
Gross margin	51,710	46,527
Operating expenses:	'	'
Research and development	16,934	14,408
Selling and marketing	14,532	10,697
General and administrative	12,264	12,458
Total operating expenses	43,730	37,563
Operating income	7,980	8,964
Other income (expense), net	-187	-96
Income before income taxes	7,793	8,868
Income tax expense	2,513	513
Net income	5,280	8,355
Net income per share	'	'
Basic, in dollars per share	$0.18	$0.30
Diluted, in dollars per share	$0.18	$0.29
Number of shares used in calculations per share	'	'
Basic, in shares	29,189	27,930
Diluted, in shares	30,033	28,558
Total stock-based compensation recorded in the three months ended March 30, 2013 and March 31, 2012 included in the above figures breaks down by expense classification as follows:	'	'
Stock based compensation	3,078	2,929
Cost of Sales [Member]	'	'
Total stock-based compensation recorded in the three months ended March 30, 2013 and March 31, 2012 included in the above figures breaks down by expense classification as follows:	'	'
Stock based compensation	169	118
Research and development	'	'
Total stock-based compensation recorded in the three months ended March 30, 2013 and March 31, 2012 included in the above figures breaks down by expense classification as follows:	'	'
Stock based compensation	731	501
Selling and marketing	'	'
Total stock-based compensation recorded in the three months ended March 30, 2013 and March 31, 2012 included in the above figures breaks down by expense classification as follows:	'	'
Stock based compensation	338	366
General and administrative	'	'
Total stock-based compensation recorded in the three months ended March 30, 2013 and March 31, 2012 included in the above figures breaks down by expense classification as follows:	'	'
Stock based compensation	$1,840	$1,944

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Statement of Partners' Capital [Abstract]	'	'
Net income, as reported	$5,280	$8,355
Other comprehensive income (loss), net of tax:	'	'
Unrealized gains/(losses) on investments, net of tax	-136	12
Total comprehensive income	$5,144	$8,367

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Cash flows from operating activities:	'	'
Net income	$5,280	$8,355
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	3,142	3,284
Loss on disposal of property and equipment	-10	182
Stock-based compensation	3,078	2,929
Increase (Decrease) in Deferred Income Taxes	1,912	-449
Tax benefit of excess stock based compensation deductions	-2,231	-43
Non-cash director deferred compensation	11	11
Changes in operating assets and liabilities - (use) source	'	'
Accounts receivable	2,808	2,133
Unbilled revenue	-75	-1,056
Inventory	4,080	4,805
Other assets	-3,588	-983
Accounts payable	-7,924	-12,711
Accrued expenses	-1,399	379
Accrued compensation	-11,862	-4,867
Deferred revenue and customer advances	-665	-2,628
Long term liabilities	-319	815
Net cash provided by operating activities	-7,762	156
Cash flows from investing activities:	'	'
Additions of property and equipment	-2,177	-1,077
Payments for (Proceeds from) Other Investing Activities	0	2,000
Purchases of investments	-11,211	-2,547
Sales of investments	2,500	1,000
Net cash used in investing activities	-10,888	-4,624
Cash flows from financing activities:	'	'
Proceeds from stock option exercises	6,957	1,744
Income tax withholding payment associated with restricted stock vesting	-1,118	-513
Tax benefit of excess stock-based compensation deductions	2,231	43
Net cash provided by financing activities	8,070	1,274
Net decrease in cash and cash equivalents	-10,580	-3,194
Cash and cash equivalents, at beginning of period	165,404	126,770
Cash and cash equivalents, at end of period	154,824	123,576
Supplemental disclosure of cash flow information:	'	'
Cash paid for income taxes	3,284	1,510
Noncash investing activity, transfer of inventory to property and equipment	637	0
Noncash or Part Noncash Acquisition, Fixed Assets Acquired	$1,373	$0

Description_of_Business

Description of Business	3 Months Ended
	Mar. 29, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Description of Business	'
	1. Description of Business
	iRobot Corporation (“iRobot” or the “Company”) develops robotics and artificial intelligence technologies and applies these technologies in producing and marketing robots. The majority of the Company’s revenue is generated from product sales and, to a lesser extent, government and commercial research and development contracts.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 29, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	2. 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 accounts and transactions. In addition, certain prior year amounts have been reclassified to conform with the current year presentation. iRobot has prepared the accompanying unaudited consolidated financial statements in conformity with accounting principles generally accepted in the United States of America.
	The accompanying unaudited financial data as of March 29, 2014 and for the three months ended March 29, 2014 and March 30, 2013 has been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted pursuant to such rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. The year-end balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States. These consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto included in its Annual Report on Form 10-K for the fiscal year ended December 28, 2013, filed with the SEC on February 18, 2014.
	In the opinion of management, all adjustments necessary to state fairly its statement of financial position as of March 29, 2014 and results of operations and cash flows for the periods ended March 29, 2014 and March 30, 2013 have been made. The results of operations and cash flows for any interim period are not necessarily indicative of the operating results and cash flows for the full fiscal year or any future periods.
	Use of Estimates
	The preparation of these financial statements in conformity with accounting principles generally accepted in the United States requires the Company to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and disclosure of contingent assets and liabilities. On an ongoing basis, management evaluates these estimates and judgments, including those related to revenue recognition, sales returns, bad debts, warranty claims, inventory reserves, valuation of investments, valuation of goodwill and intangible assets, assumptions used in valuing stock-based compensation instruments and income taxes. The Company bases these estimates on historical and anticipated results and trends and on various other assumptions that the Company believes are reasonable under the circumstances, including assumptions as to future events. These estimates form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. By their nature, estimates are subject to an inherent degree of uncertainty. Actual results may differ from the Company’s estimates.
	Fiscal Year-End
	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.
	Revenue Recognition
	The Company derives its revenue from product sales and, to a lesser extent, government and commercial research and development contracts. The Company sells products directly to customers and indirectly through resellers and distributors. The Company recognizes revenue from sales of robots under the terms of the customer agreement upon transfer of title and risk of loss to the customer, net of estimated returns, provided that collection is determined to be reasonably assured and no significant obligations remain. Sales to domestic resellers of home robots are typically subject to agreements allowing for limited rights of return, rebates and price protection. Accordingly, the Company reduces revenue for its estimates of liabilities for these rights of return at the time the related sale is recorded. The Company makes an estimate of sales returns for products sold by domestic resellers directly based on historical returns experience and other relevant data. The Company’s international distributor agreements do not currently allow for product returns and, as a result, no reserve for returns is established for this group of customers. The Company has aggregated and analyzed historical returns from domestic resellers and end users which form the basis of its estimate of future sales returns by resellers or end users. When a right of return exists, the provision for these estimated returns is recorded as a reduction of revenue at the time that the related revenue is recorded. If actual returns differ significantly from its estimates, such differences could have a material impact on the Company’s results of operations for the period in which the returns become known. The estimates for returns are adjusted periodically based upon historical rates of returns. The estimates and reserve for rebates and price protection are based on specific programs, expected usage and historical experience. Actual results could differ from these estimates.
	Under cost-plus-fixed-fee (“CPFF”) type contracts, the Company recognizes revenue based on costs incurred plus a pro rata portion of the total fixed fee. Costs incurred include labor and material that are directly associated with individual CPFF contracts plus indirect overhead and general and administrative type costs based upon billing rates submitted by the Company to the Defense Contract Management Agency (“DCMA”). Annually, the Company submits final indirect billing rates to DCMA based upon actual costs incurred throughout the year. In the situation where the Company’s final actual billing rates are greater than the estimated rates currently in effect, the Company records a cumulative revenue adjustment in the period in which the rate differential is collected from the customer. These final billing rates are subject to audit by the Defense Contract Audit Agency (“DCAA”), which can occur several years after the final billing rates are submitted and may result in material adjustments to revenue recognized based on estimated final billing rates. As of March 29, 2014, fiscal year 2007 is under audit by DCAA, and fiscal years 2008 through 2013 are open for audit by DCAA. In the situation where the Company’s anticipated actual billing rates will be lower than the provisional rates currently in effect, the Company records a cumulative revenue adjustment in the period in which the rate differential is identified. Revenue on firm fixed price (“FFP”) contracts is recognized using the percentage-of-completion method. For government product FFP contracts, revenue is recognized as the product is shipped or in accordance with the contract terms. Costs and estimated gross margins on contracts are recorded as revenue as work is performed based on the percentage that incurred costs compare to estimated total costs utilizing the most recent estimates of costs and funding. Changes in job performance, job conditions, and estimated profitability, including those arising from final contract settlements and government audits, may result in revisions to costs and income and are recognized in the period in which the revisions are determined. Since many contracts extend over a long period of time, revisions in cost and funding estimates during the progress of work have the effect of adjusting earnings applicable to past performance in the current period. When the current contract estimate indicates a loss, a provision is made for the total anticipated loss in the current period. Revenue earned in excess of billings, if any, is recorded as unbilled revenue. Billings in excess of revenue earned, if any, are recorded as deferred revenue.
	Stock-Based Compensation
	The Company accounts for stock-based compensation through recognition of the fair value of the stock-based compensation as a charge against earnings. Stock-based compensation cost for stock options is estimated at the grant date based on each option's fair value as calculated by the Black-Scholes option-pricing model. Stock-based compensation cost for restricted stock awards, time-based restricted stock units and performance-based restricted stock units is measured based on the closing fair market value of the Company's common stock on the date of grant. For performance-based restricted stock units, the compensation costs will be subsequently adjusted for assumptions of achievement during the period in which the assumption of achievement changes, as applicable. The Company recognizes stock-based compensation as expense ratably on a straight-line basis over the requisite service period, net of estimated forfeitures.
	Net Income Per Share
	The following table presents the calculation of both basic and diluted net income per share:
		Three Months Ended
		(In thousands, except per share amounts)
		29-Mar-14		30-Mar-13
	Net income	$	5,280	$	8,355
	Weighted-average shares outstanding	29,189		27,930
	Dilutive effect of employee stock options and restricted shares	844		628
	Diluted weighted-average shares outstanding	30,033		28,558
	Basic income per share	$	0.18	$	0.3
	Diluted income per share	$	0.18	$	0.29
	Restricted stock units and stock options representing approximately 0.1 million and 1.1 million shares of common stock for the three month periods ended March 29, 2014 and March 30, 2013, respectively, were excluded from the computation of diluted earnings per share for these periods because their effect would have been antidilutive.
	Income Taxes
	The Company is subject to taxation in the United States and various states and foreign jurisdictions. Though the statute of limitations is closed for fiscal years prior to 2010, the Internal Revenue Service ("IRS") has completed and closed its examination for all fiscal years prior to 2011. The statute of limitations for examinations by state tax authorities is closed for fiscal years prior to 2009. The Company's tax returns are currently under examination by certain states for the years 2009, 2010 and 2011. Federal carryforward attributes that were generated prior to fiscal year 2011, and state carryforward attributes that were generated prior to fiscal year 2009 may still be adjusted upon examination by the IRS or state tax authorities if they either have been or will be used in a period for which the statute of limitations is still open.
	Deferred taxes are determined based on the difference between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect in the years in which the differences are expected to reverse. Valuation allowances are provided if, based upon the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.
	The Company monitors the realization of its deferred tax assets based on changes in facts and circumstances, for example recurring periods of income for tax purposes following historical periods of cumulative losses or changes in tax laws or regulations. The Company's income tax provisions and its assessment of the ability to realize its deferred tax assets involve significant judgments and estimates.
	The Company recorded a tax provision of $2.5 million and $0.5 million for the three month periods ended March 29, 2014 and March 30, 2013, respectively. The $2.5 million provision for the three month period ended March 29, 2014 resulted in an effective income tax rate of 32.2%. The $0.5 million provision for the three month period ended March 30, 2013 resulted in an effective income tax rate of 5.8%. The increase in the effective income tax rate from 5.8% for the three month period ended March 30, 2013 to 32.2% for the three month period ended March 29, 2014 was primarily due to legislation that was enacted in January 2013 that included the extension of the federal research and development tax credits. The legislation retroactively reinstated research and development tax credits for 2012 and extended them through December 31, 2013. As a result, the Company recorded a discrete benefit related to 2012 during the three month period ended March 30, 2013. In addition, the federal research and development tax credits expired at the end of 2013 and have not been enacted for 2014. Therefore, the effective income tax rate of 32.2% for the three month period ended March 29, 2014 does not include any benefit for the federal research and development tax credits.
	The Company anticipates the settlement of state tax examinations may be finalized within the next twelve months and could result in a decrease in its unrecognized gross tax benefits of up to $0.7 million.
	In September 2013, the U.S. Department of the Treasury and the IRS issued final regulations addressing the acquisition, production and improvement of tangible property, and also proposed regulations addressing the disposition of property.  These regulations replace previously issued temporary regulations and are effective for tax years beginning January 1, 2014, with optional adoption permitted in 2013.  The Company has analyzed the impact of these new regulations and they did not have a material impact on the Company's consolidated financial statements.
	Fair Value Measurements
	The authoritative guidance for fair value establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.
	Financial Assets
	The Company’s financial assets measured at fair value on a recurring basis at March 29, 2014, were as follows:
		Fair Value Measurements as of
		29-Mar-14
		Level 1		Level 2		Level 3
		(In thousands)
	Description
	Assets:
	Money market funds	$	95,258	$	—	$	—
	Corporate and government bonds	—		30,540		—
	Total assets measured at fair value	$	95,258	$	30,540	$	—
	The Company’s financial assets measured at fair value on a recurring basis at December 28, 2013, were as follows:
		Fair Value Measurements as of
		28-Dec-13
		Level 1		Level 2		Level 3
		(In thousands)
	Description
	Assets:
	Money market funds	$	101,441	$	—	$	—
	Corporate and government bonds	—		21,954		—
	Total assets measured at fair value	$	101,441	$	21,954	$	—
	In each table above, the bond investments are valued based on observable market values as of the Company’s reporting date and are included in Level 2. The bond investments are recorded at fair value and marked-to-market at the end of each reporting period. The realized and unrealized gains and losses are included in comprehensive income for that period. The fair value of the Company’s bond investment is included in short term investments in its consolidated balance sheet.
	Goodwill
	Goodwill is recorded as the difference, if any, between the aggregate consideration paid for an acquisition and the fair value of the net tangible and intangible assets acquired. The Company evaluates goodwill for impairment at the reporting unit level (operating segment or one level below an operating segment) annually or more frequently if the Company believes indicators of impairment exist. In accordance with the guidance, the Company is permitted to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the Company concludes that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, then a two-step goodwill impairment test is performed.
	The first step of the impairment test involves comparing the fair values of the applicable reporting units with their aggregate carrying values, including goodwill. If the carrying amount of a reporting unit exceeds the reporting unit’s fair value, the Company performs the second step of the goodwill impairment test to determine the amount of impairment loss. The second step of the goodwill impairment test involves comparing the implied fair value of the affected reporting unit’s goodwill with the carrying value of that goodwill. The Company completes the annual impairment evaluation during the fourth quarter of each year.
	Recent Accounting Pronouncements
	In July 2013, the Financial Accounting Standards Board (“FASB”) issued an accounting standards update related to the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists.  This new guidance clarifies guidance and eliminates diversity in practice on the presentation of unrecognized tax benefits when certain situations exist at the reporting date.  This new guidance is effective for annual reporting periods beginning on or after December 15, 2013 and subsequent interim periods.  The impact of this amendment on the Company’s consolidated financial statements was not material.
	In February 2013, the FASB issued guidance requiring disclosure of amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present either on the face of the statement of operations or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required to be reclassified to net income in its entirety in the same reporting period. For amounts not reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional detail about those amounts. This guidance was effective prospectively for the Company for annual and interim periods beginning January 1, 2013. The impact of these amendments on the Company’s consolidated financial statements was not material.
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.

Inventory

Inventory	3 Months Ended
	Mar. 29, 2014
Inventory Disclosure [Abstract]	'
Inventory	'
	3. Inventory
	Inventory consists of the following:
		29-Mar-14		28-Dec-13
		(In thousands)
	Raw materials	$	8,692	$	8,520
	Work in process	—		—
	Finished goods	32,698		37,587
		$	41,390	$	46,107

Stock_Option_Plans

Stock Option Plans	3 Months Ended
	Mar. 29, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock Option Plans	'
	4. Stock Option Plans
	The Company has options outstanding under three stock incentive plans: the 2004 Stock Option and Incentive Plan (the “2004 Plan”), the 2005 Stock Option and Incentive Plan (the "2005 Plan") and the Evolution Robotics, Inc. 2007 Stock Plan (the "2007 Plan" and together with the 2004 Plan and the 2005 Plan, the “Plans”). All options that remained outstanding under the 1994 Stock Option Plan as of December 28, 2013 were exercised during the three month period ended March 29, 2014. The 2005 Plan is the only one of the three plans under which new awards may currently be granted. Under the 2005 Plan, which became effective October 10, 2005, 1,583,682 shares were initially reserved for issuance in the form of incentive stock options, non-qualified stock options, stock appreciation rights, deferred stock awards and restricted stock awards. Additionally, the 2005 Plan provides that the number of shares reserved and available for issuance under the plan will automatically increase each January 1, beginning in 2007, by 4.5% of the outstanding number of shares of common stock on the immediately preceding December 31. Stock options returned to the Plans, with the exception of those issued under the 2007 Plan, as a result of their expiration, cancellation or termination are automatically made available for issuance under the 2005 Plan. Eligibility for incentive stock options is limited to those individuals whose employment status would qualify them for the tax treatment associated with incentive stock options in accordance with the Internal Revenue Code of 1986, as amended. As of March 29, 2014, there were 5,031,694 shares available for future grant under the 2005 Plan.
	Options granted under the Plans are subject to terms and conditions as determined by the compensation committee of the board of directors, including vesting periods. Options granted under the Plans are exercisable in full at any time subsequent to vesting, generally vest over periods from zero to five years, and expire seven or ten years from the date of grant or, if earlier, 60 or 90 days from employee termination. The exercise price of incentive stock options is equal to the closing price on the NASDAQ Global Market on the date of grant. The exercise price of nonstatutory options may be set at a price other than the fair market value of the common stock.

Accrued_Expenses

Accrued Expenses	3 Months Ended
	Mar. 29, 2014
Accrued Liabilities, Current [Abstract]	'
Accrued Expenses	'
	5. Accrued Expenses
	Accrued expenses consist of the following:
		29-Mar-14		28-Dec-13
		(In thousands)
	Accrued warranty	$	6,358	$	6,497
	Accrued sales tax	759		831
	Accrued rent	720		726
	Accrued direct fulfillment costs	670		1,362
	Accrued accounting fees	323		181
	Accrued contractors	298		509
	Accrued sales commissions	247		539
	Accrued other	4,188		4,235
		$	13,563	$	14,880

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 29, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	6. Commitments and Contingencies
	Lease Obligations
	Rental expense under operating leases for the three months ended March 29, 2014 and March 30, 2013 were $1.1 million and $1.0 million, respectively. Future minimum rental payments under operating leases were as follows as of March 29, 2014:
		Operating
		Leases
		(In thousands)
	Remainder of 2014	$	2,556
	2015	3,363
	2016	2,662
	2017	2,383
	2018	2,383
	Thereafter	3,177
	Total minimum lease payments	$	16,524
	Outstanding Purchase Orders
	At March 29, 2014, the Company had outstanding purchase orders aggregating approximately $106 million. The 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 we determine that we have financial exposure associated with any of these commitments, we record 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 with respect to the Company’s products. The term of these indemnification agreements is generally perpetual 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 29, 2014 and December 28, 2013, respectively.
	Warranty
	The Company provides warranties on most products and has established a reserve for warranty based on identified or estimated warranty costs. The reserve is included as part of accrued expenses (Note 5) in the accompanying balance sheets.
	Activity related to the warranty accrual was as follows:
		Three Months Ended
		March 29, 2014			March 30, 2013
		(In thousands)
	Balance at beginning of period	$	6,497		$	6,057
	Provision	1,133			404
	Warranty usage(1)	(1,272		)	(440		)
	Balance at end of period	$	6,358		$	6,021
	-1	Warranty usage includes costs incurred for warranty obligations.
	Sales Taxes
	The Company collects and remits sales tax in jurisdictions in which it has a physical presence or it believes nexus exists, which therefore obligates the Company to collect and remit sales tax. The Company continually evaluates whether it has established nexus in new jurisdictions with respect to sales tax. The Company has recorded a liability for potential exposure in several states where there is uncertainty about the point in time at which the Company established a sufficient business connection to create nexus. The Company continues to analyze possible sales tax exposure, but does not currently believe that any individual claim or aggregate claims that might arise will ultimately have a material effect on its consolidated results of operations, financial position or cash flows.

Industry_Segment_Geographic_In

Industry Segment, Geographic Information and Significant Customers	3 Months Ended
	Mar. 29, 2014
Segment Reporting [Abstract]	'
Industry Segment, Geographic Information and Significant Customers	'
	. Industry Segment, Geographic Information and Significant Customers
	The Company operates in two reportable segments, the home robots business unit and the defense and security robots business unit. The nature of products and types of customers for the two segments vary significantly. As such, the segments are managed separately.
	Home Robots
	The Company’s home robots business unit offers products to consumers through a network of retail businesses throughout the United States, to various countries through international distributors and retailers, and through the Company’s on-line store. The Company’s home robots business unit includes mobile robots used in the maintenance of households.
	Defense and Security
	The Company’s defense and security robots business unit offers products to the U.S. Department of Defense through a small U.S. government-focused sales force and distributors, and to other North American and international entities through small domestic and international sales teams, as well as through North American and international distributors. The Company’s defense and security robots are used to increase warfighters', law enforcement, security forces and first responders' safety and productivity.
	Other
	The Company’s other revenue and cost of revenue result from other smaller business units that do not meet the criteria of a reportable segment, as well as certain operational costs included in cost of revenue.
	The table below presents segment information about revenue, cost of revenue, gross margin and income before income taxes:
		Three Months Ended
		(In thousands)
		March 29, 2014			March 30, 2013
	Revenue:
	Home Robots	$	108,035		$	92,699
	Defense & Security	5,602			11,100
	Other	567			2,396
	Total revenue	114,204			106,195
	Cost of revenue:
	Home Robots	53,595			48,025
	Defense & Security	3,518			5,825
	Other	5,381			5,818
	Total cost of revenue	62,494			59,668
	Gross margin:
	Home Robots	54,440			44,674
	Defense & Security	2,084			5,275
	Other	(4,814		)	(3,422		)
	Total gross margin	51,710			46,527
	Research and development	16,934			14,408
	Selling and marketing	14,532			10,697
	General and administrative	12,264			12,458
	Other income (expense), net	(187		)	(96		)
	Income before income taxes	$	7,793		$	8,868
	Geographic Information
	For the three months ended March 29, 2014 and March 30, 2013, sales to non-U.S. customers accounted for 60.8% and 59.6% of total revenue, respectively.
	Significant Customers
	For the three months ended March 29, 2014, the Company generated 20.0% and 13.1%, respectively, of total revenue from two of its international distributors of home robots products. For the three months ended March 30, 2013, the Company generated 21.9% and 10.2%, respectively, of total revenue from two of its international distributors of home robots products.

Goodwill_Other_Intangible_Asse

Goodwill, Other Intangible Assets and Other Assets	3 Months Ended
	Mar. 29, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	'
	Other Assets
	Other assets at March 29, 2014 and December 28, 2013 consisted of the following:
		March 29,		December 28,
		2014		2013
		(In thousands)
	Investment in Advanced Scientific Concepts, Inc.	$	2,500	$	2,500
	Investment in InTouch Technologies, Inc.	8,001		8,001
		$	10,501	$	10,501
	These investments are accounted for utilizing the cost method of accounting. The Company regularly monitors the investments to determine if facts and circumstances have changed in a manner that would require a change in accounting methodology. Additionally, the Company periodically evaluates whether or not an investment has been impaired by considering such factors as economic environment, market conditions, operational performance and other specific factors relating to the business underlying the investment. If any such impairment is identified, a reduction in the carrying value of the investment would be recorded at that time.
Schedule of Cost Method Investments [Table Text Block]	'
	Other assets at March 29, 2014 and December 28, 2013 consisted of the following:
		March 29,		December 28,
		2014		2013
		(In thousands)
	Investment in Advanced Scientific Concepts, Inc.	$	2,500	$	2,500
	Investment in InTouch Technologies, Inc.	8,001		8,001
		$	10,501	$	10,501
Goodwill, Other Intangible Assets and Other Assets	'
	. Goodwill, Other Intangible Assets and Other Assets
	Goodwill
	The carrying amount of the Company's goodwill at March 29, 2014 is $48.8 million, of which $41.1 million resulted from the acquisition of Evolution Robotics, Inc. in October 2012 and was assigned to the home robots reporting unit. $7.7 million resulted from the acquisition of Nekton Research, LLC completed in September 2008 and was assigned to the defense and security reporting unit. In conjunction with the Company's reorganization completed as of the beginning of the fiscal year 2013, the defense and security reporting unit was divided into two reporting units: the defense and security reporting unit and the research reporting unit. As a result, the goodwill of $7.9 million was reassigned utilizing a relative fair value allocation approach. $7.7 million and $0.2 million were reassigned to the defense and security and research reporting units, respectively.
	Other Intangible Assets
	Other intangible assets include the value assigned to completed technology, research contracts, and a trade name. The estimated useful lives for all of these intangible assets are two to ten years. The intangible assets are being amortized on a straight-line basis, which is consistent with the pattern that the economic benefits of the intangible assets are expected to be utilized.
	Intangible assets at March 29, 2014 and December 28, 2013 consisted of the following:
		March 29, 2014								December 28, 2013
		Cost		Accumulated		Impairment Loss		Net		Cost		Accumulated		Impairment Loss		Net
				Amortization								Amortization
		(In thousands)
	Completed technology	$	30,600	$	7,098	$	1,788	$	21,714	$	30,600	$	6,202	1,788		$	22,610
	Research contracts	100		100		—		—		100		100		—		—
	Tradename	800		750		—		50		800		742		—		58
	Total	$	31,500	$	7,948	$	1,788	$	21,764	$	31,500	$	7,044	$	1,788	$	22,668
	Amortization expense related to acquired intangible assets was $0.9 million and $1.0 million for the three months ended March 29, 2014 and March 30, 2013, respectively. The estimated future amortization expense is expected to be as follows:
		(In thousands)
	Remainder of 2014	$	2,618
	2015	3,482
	2016	3,457
	2017	3,457
	2018	3,457
	Thereafter	5,293
	Total	$	21,764

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 29, 2014
Accounting Policies [Abstract]	'
Fair Value Measurement, Policy [Policy Text Block]	'
	Fair Value Measurements
	The authoritative guidance for fair value establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.
	Financial Assets
	The Company’s financial assets measured at fair value on a recurring basis at March 29, 2014, were as follows:
		Fair Value Measurements as of
		29-Mar-14
		Level 1		Level 2		Level 3
		(In thousands)
	Description
	Assets:
	Money market funds	$	95,258	$	—	$	—
	Corporate and government bonds	—		30,540		—
	Total assets measured at fair value	$	95,258	$	30,540	$	—
	The Company’s financial assets measured at fair value on a recurring basis at December 28, 2013, were as follows:
		Fair Value Measurements as of
		28-Dec-13
		Level 1		Level 2		Level 3
		(In thousands)
	Description
	Assets:
	Money market funds	$	101,441	$	—	$	—
	Corporate and government bonds	—		21,954		—
	Total assets measured at fair value	$	101,441	$	21,954	$	—
	In each table above, the bond investments are valued based on observable market values as of the Company’s reporting date and are included in Level 2. The bond investments are recorded at fair value and marked-to-market at the end of each reporting period. The realized and unrealized gains and losses are included in comprehensive income for that period. The fair value of the Company’s bond investment is included in short term investments in its consolidated balance sheet.
Basis of Presentation	'
	Basis of Presentation
	The accompanying consolidated financial statements include those of iRobot and its subsidiaries, after elimination of all intercompany accounts and transactions. In addition, certain prior year amounts have been reclassified to conform with the current year presentation. iRobot has prepared the accompanying unaudited consolidated financial statements in conformity with accounting principles generally accepted in the United States of America.
	The accompanying unaudited financial data as of March 29, 2014 and for the three months ended March 29, 2014 and March 30, 2013 has been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted pursuant to such rules and regulations. However, the Company believes that the disclosures are adequate to make the information presented not misleading. The year-end balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States. These consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto included in its Annual Report on Form 10-K for the fiscal year ended December 28, 2013, filed with the SEC on February 18, 2014.
	In the opinion of management, all adjustments necessary to state fairly its statement of financial position as of March 29, 2014 and results of operations and cash flows for the periods ended March 29, 2014 and March 30, 2013 have been made. The results of operations and cash flows for any interim period are not necessarily indicative of the operating results and cash flows for the full fiscal year or any future periods.
Use of Estimates	'
	Use of Estimates
	The preparation of these financial statements in conformity with accounting principles generally accepted in the United States requires the Company to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and disclosure of contingent assets and liabilities. On an ongoing basis, management evaluates these estimates and judgments, including those related to revenue recognition, sales returns, bad debts, warranty claims, inventory reserves, valuation of investments, valuation of goodwill and intangible assets, assumptions used in valuing stock-based compensation instruments and income taxes. The Company bases these estimates on historical and anticipated results and trends and on various other assumptions that the Company believes are reasonable under the circumstances, including assumptions as to future events. These estimates form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. By their nature, estimates are subject to an inherent degree of uncertainty. Actual results may differ from the Company’s estimates.
Fiscal Year-End	'
	Fiscal Year-End
	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.
Revenue Recognition	'
	Revenue Recognition
	The Company derives its revenue from product sales and, to a lesser extent, government and commercial research and development contracts. The Company sells products directly to customers and indirectly through resellers and distributors. The Company recognizes revenue from sales of robots under the terms of the customer agreement upon transfer of title and risk of loss to the customer, net of estimated returns, provided that collection is determined to be reasonably assured and no significant obligations remain. Sales to domestic resellers of home robots are typically subject to agreements allowing for limited rights of return, rebates and price protection. Accordingly, the Company reduces revenue for its estimates of liabilities for these rights of return at the time the related sale is recorded. The Company makes an estimate of sales returns for products sold by domestic resellers directly based on historical returns experience and other relevant data. The Company’s international distributor agreements do not currently allow for product returns and, as a result, no reserve for returns is established for this group of customers. The Company has aggregated and analyzed historical returns from domestic resellers and end users which form the basis of its estimate of future sales returns by resellers or end users. When a right of return exists, the provision for these estimated returns is recorded as a reduction of revenue at the time that the related revenue is recorded. If actual returns differ significantly from its estimates, such differences could have a material impact on the Company’s results of operations for the period in which the returns become known. The estimates for returns are adjusted periodically based upon historical rates of returns. The estimates and reserve for rebates and price protection are based on specific programs, expected usage and historical experience. Actual results could differ from these estimates.
	Under cost-plus-fixed-fee (“CPFF”) type contracts, the Company recognizes revenue based on costs incurred plus a pro rata portion of the total fixed fee. Costs incurred include labor and material that are directly associated with individual CPFF contracts plus indirect overhead and general and administrative type costs based upon billing rates submitted by the Company to the Defense Contract Management Agency (“DCMA”). Annually, the Company submits final indirect billing rates to DCMA based upon actual costs incurred throughout the year. In the situation where the Company’s final actual billing rates are greater than the estimated rates currently in effect, the Company records a cumulative revenue adjustment in the period in which the rate differential is collected from the customer. These final billing rates are subject to audit by the Defense Contract Audit Agency (“DCAA”), which can occur several years after the final billing rates are submitted and may result in material adjustments to revenue recognized based on estimated final billing rates. As of March 29, 2014, fiscal year 2007 is under audit by DCAA, and fiscal years 2008 through 2013 are open for audit by DCAA. In the situation where the Company’s anticipated actual billing rates will be lower than the provisional rates currently in effect, the Company records a cumulative revenue adjustment in the period in which the rate differential is identified. Revenue on firm fixed price (“FFP”) contracts is recognized using the percentage-of-completion method. For government product FFP contracts, revenue is recognized as the product is shipped or in accordance with the contract terms. Costs and estimated gross margins on contracts are recorded as revenue as work is performed based on the percentage that incurred costs compare to estimated total costs utilizing the most recent estimates of costs and funding. Changes in job performance, job conditions, and estimated profitability, including those arising from final contract settlements and government audits, may result in revisions to costs and income and are recognized in the period in which the revisions are determined. Since many contracts extend over a long period of time, revisions in cost and funding estimates during the progress of work have the effect of adjusting earnings applicable to past performance in the current period. When the current contract estimate indicates a loss, a provision is made for the total anticipated loss in the current period. Revenue earned in excess of billings, if any, is recorded as unbilled revenue. Billings in excess of revenue earned, if any, are recorded as deferred revenue.
Accounting for Share-Based Payments	'
	Stock-Based Compensation
	The Company accounts for stock-based compensation through recognition of the fair value of the stock-based compensation as a charge against earnings. Stock-based compensation cost for stock options is estimated at the grant date based on each option's fair value as calculated by the Black-Scholes option-pricing model. Stock-based compensation cost for restricted stock awards, time-based restricted stock units and performance-based restricted stock units is measured based on the closing fair market value of the Company's common stock on the date of grant. For performance-based restricted stock units, the compensation costs will be subsequently adjusted for assumptions of achievement during the period in which the assumption of achievement changes, as applicable. The Company recognizes stock-based compensation as expense ratably on a straight-line basis over the requisite service period, net of estimated forfeitures.
Net Income Per Share	'
	Net Income Per Share
	The following table presents the calculation of both basic and diluted net income per share:
		Three Months Ended
		(In thousands, except per share amounts)
		29-Mar-14		30-Mar-13
	Net income	$	5,280	$	8,355
	Weighted-average shares outstanding	29,189		27,930
	Dilutive effect of employee stock options and restricted shares	844		628
	Diluted weighted-average shares outstanding	30,033		28,558
	Basic income per share	$	0.18	$	0.3
	Diluted income per share	$	0.18	$	0.29
	Restricted stock units and stock options representing approximately 0.1 million and 1.1 million shares of common stock for the three month periods ended March 29, 2014 and March 30, 2013, respectively, were excluded from the computation of diluted earnings per share for these periods because their effect would have been antidilutive.
Income Taxes	'
	Income Taxes
	The Company is subject to taxation in the United States and various states and foreign jurisdictions. Though the statute of limitations is closed for fiscal years prior to 2010, the Internal Revenue Service ("IRS") has completed and closed its examination for all fiscal years prior to 2011. The statute of limitations for examinations by state tax authorities is closed for fiscal years prior to 2009. The Company's tax returns are currently under examination by certain states for the years 2009, 2010 and 2011. Federal carryforward attributes that were generated prior to fiscal year 2011, and state carryforward attributes that were generated prior to fiscal year 2009 may still be adjusted upon examination by the IRS or state tax authorities if they either have been or will be used in a period for which the statute of limitations is still open.
	Deferred taxes are determined based on the difference between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect in the years in which the differences are expected to reverse. Valuation allowances are provided if, based upon the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.
	The Company monitors the realization of its deferred tax assets based on changes in facts and circumstances, for example recurring periods of income for tax purposes following historical periods of cumulative losses or changes in tax laws or regulations. The Company's income tax provisions and its assessment of the ability to realize its deferred tax assets involve significant judgments and estimates.
	The Company recorded a tax provision of $2.5 million and $0.5 million for the three month periods ended March 29, 2014 and March 30, 2013, respectively. The $2.5 million provision for the three month period ended March 29, 2014 resulted in an effective income tax rate of 32.2%. The $0.5 million provision for the three month period ended March 30, 2013 resulted in an effective income tax rate of 5.8%. The increase in the effective income tax rate from 5.8% for the three month period ended March 30, 2013 to 32.2% for the three month period ended March 29, 2014 was primarily due to legislation that was enacted in January 2013 that included the extension of the federal research and development tax credits. The legislation retroactively reinstated research and development tax credits for 2012 and extended them through December 31, 2013. As a result, the Company recorded a discrete benefit related to 2012 during the three month period ended March 30, 2013. In addition, the federal research and development tax credits expired at the end of 2013 and have not been enacted for 2014. Therefore, the effective income tax rate of 32.2% for the three month period ended March 29, 2014 does not include any benefit for the federal research and development tax credits.
	The Company anticipates the settlement of state tax examinations may be finalized within the next twelve months and could result in a decrease in its unrecognized gross tax benefits of up to $0.7 million.
	In September 2013, the U.S. Department of the Treasury and the IRS issued final regulations addressing the acquisition, production and improvement of tangible property, and also proposed regulations addressing the disposition of property.  These regulations replace previously issued temporary regulations and are effective for tax years beginning January 1, 2014, with optional adoption permitted in 2013.  The Company has analyzed the impact of these new regulations and they did not have a material impact on the Company's consolidated financial statements.
Goodwill	'
	Goodwill
	Goodwill is recorded as the difference, if any, between the aggregate consideration paid for an acquisition and the fair value of the net tangible and intangible assets acquired. The Company evaluates goodwill for impairment at the reporting unit level (operating segment or one level below an operating segment) annually or more frequently if the Company believes indicators of impairment exist. In accordance with the guidance, the Company is permitted to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the Company concludes that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, then a two-step goodwill impairment test is performed.
	The first step of the impairment test involves comparing the fair values of the applicable reporting units with their aggregate carrying values, including goodwill. If the carrying amount of a reporting unit exceeds the reporting unit’s fair value, the Company performs the second step of the goodwill impairment test to determine the amount of impairment loss. The second step of the goodwill impairment test involves comparing the implied fair value of the affected reporting unit’s goodwill with the carrying value of that goodwill. The Company completes the annual impairment evaluation during the fourth quarter of each year.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In July 2013, the Financial Accounting Standards Board (“FASB”) issued an accounting standards update related to the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists.  This new guidance clarifies guidance and eliminates diversity in practice on the presentation of unrecognized tax benefits when certain situations exist at the reporting date.  This new guidance is effective for annual reporting periods beginning on or after December 15, 2013 and subsequent interim periods.  The impact of this amendment on the Company’s consolidated financial statements was not material.
	In February 2013, the FASB issued guidance requiring disclosure of amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present either on the face of the statement of operations or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required to be reclassified to net income in its entirety in the same reporting period. For amounts not reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional detail about those amounts. This guidance was effective prospectively for the Company for annual and interim periods beginning January 1, 2013. The impact of these amendments on the Company’s consolidated financial statements was not material.
	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.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 29, 2014
Accounting Policies [Abstract]	'
Basic and Diluted Net Income Per Share	'
	The following table presents the calculation of both basic and diluted net income per share:
		Three Months Ended
		(In thousands, except per share amounts)
		29-Mar-14		30-Mar-13
	Net income	$	5,280	$	8,355
	Weighted-average shares outstanding	29,189		27,930
	Dilutive effect of employee stock options and restricted shares	844		628
	Diluted weighted-average shares outstanding	30,033		28,558
	Basic income per share	$	0.18	$	0.3
	Diluted income per share	$	0.18	$	0.29
Fair Value Assets Measured on Recurring Basis	'
	The Company’s financial assets measured at fair value on a recurring basis at March 29, 2014, were as follows:
		Fair Value Measurements as of
		29-Mar-14
		Level 1		Level 2		Level 3
		(In thousands)
	Description
	Assets:
	Money market funds	$	95,258	$	—	$	—
	Corporate and government bonds	—		30,540		—
	Total assets measured at fair value	$	95,258	$	30,540	$	—
	The Company’s financial assets measured at fair value on a recurring basis at December 28, 2013, were as follows:
		Fair Value Measurements as of
		28-Dec-13
		Level 1		Level 2		Level 3
		(In thousands)
	Description
	Assets:
	Money market funds	$	101,441	$	—	$	—
	Corporate and government bonds	—		21,954		—
	Total assets measured at fair value	$	101,441	$	21,954	$	—

Inventory_Tables

Inventory (Tables)	3 Months Ended
	Mar. 29, 2014
Inventory Disclosure [Abstract]	'
Components of Inventory	'
	Inventory consists of the following:
		29-Mar-14		28-Dec-13
		(In thousands)
	Raw materials	$	8,692	$	8,520
	Work in process	—		—
	Finished goods	32,698		37,587
		$	41,390	$	46,107

Accrued_Expenses_Tables

Accrued Expenses (Tables)	3 Months Ended
	Mar. 29, 2014
Accrued Liabilities, Current [Abstract]	'
Components of Accrued Expenses	'
	Accrued expenses consist of the following:
		29-Mar-14		28-Dec-13
		(In thousands)
	Accrued warranty	$	6,358	$	6,497
	Accrued sales tax	759		831
	Accrued rent	720		726
	Accrued direct fulfillment costs	670		1,362
	Accrued accounting fees	323		181
	Accrued contractors	298		509
	Accrued sales commissions	247		539
	Accrued other	4,188		4,235
		$	13,563	$	14,880

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 29, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Summary of Future Minimum Rental Payments under Operating Leases	'
	Future minimum rental payments under operating leases were as follows as of March 29, 2014:
		Operating
		Leases
		(In thousands)
	Remainder of 2014	$	2,556
	2015	3,363
	2016	2,662
	2017	2,383
	2018	2,383
	Thereafter	3,177
	Total minimum lease payments	$	16,524
Activity Related to the Warranty Accrual	'
	Activity related to the warranty accrual was as follows:
		Three Months Ended
		March 29, 2014			March 30, 2013
		(In thousands)
	Balance at beginning of period	$	6,497		$	6,057
	Provision	1,133			404
	Warranty usage(1)	(1,272		)	(440		)
	Balance at end of period	$	6,358		$	6,021
	-1	Warranty usage includes costs incurred for warranty obligations.

Industry_Segment_Geographic_In1

Industry Segment, Geographic Information and Significant Customers (Tables)	3 Months Ended
	Mar. 29, 2014
Segment Reporting [Abstract]	'
Segment Information about Revenue, Cost of Revenue, Gross Margin and Income before Income Taxes	'
	The table below presents segment information about revenue, cost of revenue, gross margin and income before income taxes:
		Three Months Ended
		(In thousands)
		March 29, 2014			March 30, 2013
	Revenue:
	Home Robots	$	108,035		$	92,699
	Defense & Security	5,602			11,100
	Other	567			2,396
	Total revenue	114,204			106,195
	Cost of revenue:
	Home Robots	53,595			48,025
	Defense & Security	3,518			5,825
	Other	5,381			5,818
	Total cost of revenue	62,494			59,668
	Gross margin:
	Home Robots	54,440			44,674
	Defense & Security	2,084			5,275
	Other	(4,814		)	(3,422		)
	Total gross margin	51,710			46,527
	Research and development	16,934			14,408
	Selling and marketing	14,532			10,697
	General and administrative	12,264			12,458
	Other income (expense), net	(187		)	(96		)
	Income before income taxes	$	7,793		$	8,868

Goodwill_Other_Intangible_Asse1

Goodwill, Other Intangible Assets and Other Assets (Tables)	3 Months Ended
	Mar. 29, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Cost Method Investments [Table Text Block]	'
	Other assets at March 29, 2014 and December 28, 2013 consisted of the following:
		March 29,		December 28,
		2014		2013
		(In thousands)
	Investment in Advanced Scientific Concepts, Inc.	$	2,500	$	2,500
	Investment in InTouch Technologies, Inc.	8,001		8,001
		$	10,501	$	10,501
Other Intangible Assets	'
	Intangible assets at March 29, 2014 and December 28, 2013 consisted of the following:
		March 29, 2014								December 28, 2013
		Cost		Accumulated		Impairment Loss		Net		Cost		Accumulated		Impairment Loss		Net
				Amortization								Amortization
		(In thousands)
	Completed technology	$	30,600	$	7,098	$	1,788	$	21,714	$	30,600	$	6,202	1,788		$	22,610
	Research contracts	100		100		—		—		100		100		—		—
	Tradename	800		750		—		50		800		742		—		58
	Total	$	31,500	$	7,948	$	1,788	$	21,764	$	31,500	$	7,044	$	1,788	$	22,668
Estimated Future Amortization Expense Related to Current Intangible Assets	'
	The estimated future amortization expense is expected to be as follows:
		(In thousands)
	Remainder of 2014	$	2,618
	2015	3,482
	2016	3,457
	2017	3,457
	2018	3,457
	Thereafter	5,293
	Total	$	21,764

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Revision (Details)	3 Months Ended
	Mar. 29, 2014
Document Period End Date	29-Mar-14

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share (Detail) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]	'	'
Document Period End Date	29-Mar-14	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	100,000	1,100,000
Net income	$5,280	$8,355
Weighted-average shares outstanding	29,189,000	27,930,000
Dilutive effect of employee stock options and restricted shares	844,000	628,000
Diluted weighted-average shares outstanding	30,033,000	28,558,000
Basic income per share	$0.18	$0.30
Diluted income per share	$0.18	$0.29

Summary_of_Significant_Account5

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, except Share data in Millions, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013	Dec. 28, 2013
Disclosure Summary Of Significant Accounting Policies Additional Information [Abstract]	'	'	'
Finite-Lived Intangible Assets, Gross	$31,500	'	$31,500
Finite-Lived Intangible Assets, Net	$21,764	'	$22,668
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.1	1.1	'

Summary_of_Significant_Account6

Summary of Significant Accounting Policies - Income Taxes (Details) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Income Tax Disclosure [Abstract]	'	'
Tax provision	$2,513,000	$513,000
Effective income tax rate	32.20%	5.80%
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$700,000	'

Summary_of_Significant_Account7

Summary of Significant Accounting Policies - Fair Value Assets Measured on Recurring Basis (Detail) (USD $)	Mar. 29, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Fair Value, Inputs, Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Recurring	$95,258	$101,441
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Recurring	95,258	101,441
Fair Value, Inputs, Level 1 [Member] | Bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Recurring	0	0
Fair Value, Inputs, Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Recurring	30,540	21,954
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Recurring	0	0
Fair Value, Inputs, Level 2 [Member] | Bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Recurring	30,540	21,954
Fair Value, Inputs, Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Recurring	0	0
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Recurring	0	0
Fair Value, Inputs, Level 3 [Member] | Bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure, Recurring	$0	$0

Summary_of_Significant_Account8

Summary of Significant Accounting Policies - Fair Value Assets Measured on a Nonrecurring Basis (Details) (USD $)	Mar. 29, 2014	Dec. 28, 2013	Sep. 30, 2008
In Thousands, unless otherwise specified			Nekton Research LLC [Member]
			Research Reporting Unit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Goodwill	$48,751	$48,751	$200
Finite-Lived Intangible Assets, Gross	31,500	31,500	'
Finite-Lived Intangible Assets, Net	$21,764	$22,668	'

Inventory_Details

Inventory (Details) (USD $)	Mar. 29, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Inventory, Raw Materials, Net of Reserves	$8,692	$8,520
Inventory, Work in Process, Net of Reserves	0	0
Inventory, Finished Goods, Net of Reserves	32,698	37,587
Inventory	$41,390	$46,107

Stock_Option_Plans_Additional_

Stock Option Plans - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Oct. 10, 2005	Mar. 29, 2014	Mar. 07, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Effective date for stock options plan	10-Oct-05	'	'
Increase in number of shares reserved and available for issuance in different forms	'	4.50%	'
Document Period End Date	'	29-Mar-14	'
Share Price	'	'	$43.35
Stock Options	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Minimum period for expiration of options in case of employee termination	'	'60 days	'
Maximum period for expiration of options in case of employee termination	'	'90 days	'
Stock Options | Minimum	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Vesting period for options	'	'0 years	'
Minimum expiration period for options	'	'7 years	'
Stock Options | Maximum	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Vesting period for options	'	'5 years	'
Minimum expiration period for options	'	'10 years	'
Common stock | Executive Officer [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Common stock granted	'	33,938	'
Time-based Restricted Stock Unit [Member] | Executive Officer [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Restricted stock units granted	'	59,433	'
Performance-based Restricted Stock Unit [Member] | Executive Officer [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Restricted stock units granted	'	29,717	'
2005 Plan	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Shares reserved for issuance in different forms	1,583,682	'	'
Share based compensation arrangement shares available for grant	'	5,031,694	'

Accrued_Expenses_Details

Accrued Expenses (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Dec. 28, 2013
Accrued Liabilities, Current [Abstract]	'	'
Document Period End Date	29-Mar-14	'
Accounts Payable, Current [Abstract]	'	'
Accrued warranty	$6,358	$6,497
Accrued Sales Tax	759	831
Accrued rent	720	726
Accrued direct fulfillment costs	670	1,362
Accrued sales commissions	247	539
Accrued accounting fees	323	181
Accrued contractors, current	298	509
Accrued other	4,188	4,235
Accrued expenses	13,563	14,880
Employee-related Liabilities, Current	$7,744	$19,606

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	Mar. 29, 2014
In Millions, unless otherwise specified
Outstanding POs [Abstract]	'
Contractual Obligation	$106

Commitments_and_Contingencies_2

Commitments and Contingencies - Summary of Future Minimum Rental Payments under Operating Leases (Detail) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'	'
Rental expense under operating leases	$1,100,000	$1,000,000
Disclosure Summary Of Future Minimum Rental Payments Under Operating Leases [Abstract]	'	'
Remainder of 2013	2,556,000	'
2014	3,363,000	'
2015	2,662,000	'
2016	2,383,000	'
2017	2,383,000	'
Thereafter	3,177,000	'
Total minimum lease payments	$16,524,000	'

Commitments_and_Contingencies_3

Commitments and Contingencies - Activity Related to Warranty Accrual (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014		Mar. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'		'
Document Period End Date	29-Mar-14		'
Movement in Standard Product Warranty Accrual [Roll Forward]	'		'
Balance at beginning of period	$6,497		$6,057
Provision	1,133		404
Warranty usage	-1,272	[1]	-440	[1]
Balance at end of period	$6,358		$6,021
[1]	Warranty usage includes costs incurred for warranty obligations.

Industry_Segment_Geographic_In2

Industry Segment, Geographic Information and Significant Customers - Segment Information about Revenue, Cost of Revenue, Gross Margin and Income before Income Taxes (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Revenue:	'	'
Total revenue	$114,204	$106,195
Cost of revenue:	'	'
Total cost of revenue	62,494	59,668
Gross margin:	'	'
Gross margin	51,710	46,527
Research and development	16,934	14,408
Selling and marketing	14,532	10,697
General and administrative	12,264	12,458
Other income (expense), net	-187	-96
Income before income taxes	7,793	8,868
Home Robots	'	'
Revenue:	'	'
Total revenue	108,035	92,699
Cost of revenue:	'	'
Total cost of revenue	53,595	48,025
Gross margin:	'	'
Gross margin	54,440	44,674
Defense & Security	'	'
Revenue:	'	'
Total revenue	5,602	11,100
Cost of revenue:	'	'
Total cost of revenue	3,518	5,825
Gross margin:	'	'
Gross margin	2,084	5,275
Other	'	'
Revenue:	'	'
Total revenue	567	2,396
Cost of revenue:	'	'
Total cost of revenue	5,381	5,818
Gross margin:	'	'
Gross margin	($4,814)	($3,422)

Industry_Segment_Geographic_In3

Industry Segment, Geographic Information and Significant Customers - Additional Information (Detail)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'
Number of operating segments	2	'
Number of customer generating major revenues	2	'
Customer Concentration Risk [Member] | Customer Concentration Risk [Member]	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'
Concentration Risk, Percentage	60.80%	59.60%
Customer Concentration Risk [Member] | International distributors of home robots products | Distributor One	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'
Concentration Risk, Percentage	20.00%	21.90%
Customer Concentration Risk [Member] | International distributors of home robots products | Distributor Two	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'
Concentration Risk, Percentage	13.10%	10.20%

Goodwill_Other_Intangible_Asse2

Goodwill, Other Intangible Assets and Other Assets - Additional Information (Detail) (USD $)	3 Months Ended			3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Dec. 28, 2013	Mar. 29, 2014	Mar. 29, 2014	Oct. 02, 2012	Mar. 29, 2014	Sep. 30, 2008	Sep. 30, 2008	Sep. 30, 2008
				Minimum	Maximum	Home Robots	Defense & Security	Defense & Security	Defense and Security Reporting Unit	Research Reporting Unit [Member]
						Evolution Robotics, Inc. (ER)	Nekton Research LLC [Member]	Nekton Research LLC [Member]	Nekton Research LLC [Member]	Nekton Research LLC [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'	'
Goodwill	$48,751,000	'	$48,751,000	'	'	$41,100,000	$7,700,000	'	$7,700,000	$200,000
Goodwill, Gross	'	'	'	'	'	'	'	7,900,000	'	'
Estimated useful life of intangible assets	'	'	'	'2 years	'10 years	'	'	'	'	'
Amortization of Acquired Intangible Assets	$900,000	$1,000,000	'	'	'	'	'	'	'	'

Goodwill_Other_Intangible_Asse3

Goodwill, Other Intangible Assets and Other Assets - Other Intangible Assets (Detail) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Dec. 28, 2013
Finite-Lived Intangible Assets [Line Items]	'	'	'
Document Period End Date	29-Mar-14	'	'
Finite-Lived Intangible Assets, Gross	$31,500,000	'	$31,500,000
Intangible assets accumulated amortization	7,948,000	'	7,044,000
Finite-lived intangible assets, accumulated impairment loss	1,788,000	'	1,788,000
Intangible Assets, Net	21,764,000	'	22,668,000
Amortization of Acquired Intangible Assets	900,000	1,000,000	'
Completed technology	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Finite-Lived Intangible Assets, Gross	30,600,000	'	30,600,000
Intangible assets accumulated amortization	7,098,000	'	6,202,000
Finite-lived intangible assets, accumulated impairment loss	1,788,000	'	1,788,000
Intangible Assets, Net	21,714,000	'	22,610,000
Research contracts	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Finite-Lived Intangible Assets, Gross	100,000	'	100,000
Intangible assets accumulated amortization	100,000	'	100,000
Finite-lived intangible assets, accumulated impairment loss	0	'	0
Intangible Assets, Net	0	'	0
Trade Names	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Finite-Lived Intangible Assets, Gross	800,000	'	800,000
Intangible assets accumulated amortization	750,000	'	742,000
Finite-lived intangible assets, accumulated impairment loss	0	'	0
Intangible Assets, Net	$50,000	'	$58,000

Goodwill_Other_Intangible_Asse4

Goodwill, Other Intangible Assets and Other Assets - Estimated Future Amortization Expense Related to Current Intangible Assets (Detail) (USD $)	Mar. 29, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Disclosure Estimated Future Amortization Expense Related To Current Intangible Assets [Abstract]	'	'
Remainder of 2014	$2,618	'
2014	3,482	'
2015	3,457	'
2016	3,457	'
2017	3,457	'
Thereafter	5,293	'
Intangible Assets, Net	$21,764	$22,668

Goodwill_Other_Intangible_Asse5

Goodwill, Other Intangible Assets and Other Assets - Other Assets (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 29, 2014	Dec. 28, 2013	Mar. 29, 2014	Dec. 28, 2013	Mar. 29, 2014	Dec. 28, 2013
		Preferred Stock [Member]	Preferred Stock [Member]	Preferred Stock [Member]	Preferred Stock [Member]	Preferred Stock [Member]	Preferred Stock [Member]
				Advanced Scientific Concepts, Inc. [Member]	Advanced Scientific Concepts, Inc. [Member]	InTouch Technologies, Inc. [Member]	InTouch Technologies, Inc. [Member]
Schedule of Cost-method Investments [Line Items]	'	'	'	'	'	'	'
Document Period End Date	29-Mar-14	'	'	'	'	'	'
Cost Method Investments	'	$10,501	$10,501	$2,500	$2,500	$8,001	$8,001