iRobot (IRBT) 10-K 18 Feb 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 28, 2013	Feb. 10, 2014	Jun. 29, 2013
Document and Entity Information [Abstract]	'	'	'
Entity Registrant Name	'IROBOT CORP	'	'
Entity Central Index Key	'0001159167	'	'
Document Type	'10-K	'	'
Document Period End Date	28-Dec-13	'	'
Amendment Flag	'false	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Current Fiscal Year End Date	'--12-28	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Public Float	'	'	$1,100,000,000
Entity Common Stock, Shares Outstanding	'	29,020,961	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$165,404	$126,770
Short term investments	21,954	12,430
Accounts receivable, net of allowance of $67 and $111 at December 28, 2013 and December 29, 2012, respectively	39,348	29,413
Unbilled revenue	856	1,196
Inventory	46,107	36,965
Deferred tax assets	20,144	19,266
Other current assets	6,848	8,853
Total current assets	300,661	234,893
Property and equipment, net	23,661	24,953
Deferred tax assets	10,095	8,792
Goodwill	48,751	48,951
Intangible assets, net	22,668	28,224
Other assets	10,501	8,500
Total assets	416,337	354,313
Current liabilities:	'	'
Accounts payable	41,344	42,515
Accrued expenses	14,880	13,642
Accrued compensation	19,606	11,864
Deferred Revenue, Current	5,085	6,257
Total current liabilities	80,915	74,278
Long term liabilities	4,733	4,218
Commitments and contingencies (Note 11):	'	'
Redeemable convertible preferred stock, 5,000,000 shares authorized and no shares issued or outstanding	0	0
Common stock, $0.01 par value, 100,000,000 shares authorized; and 28,935,253 and 27,781,659 shares issued and outstanding at December 28, 2013 and December 29, 2012, respectively	289	278
Additional paid-in capital	227,175	199,903
Retained earnings	103,078	75,437
Accumulated other comprehensive income	147	199
Total stockholders’ equity	330,689	275,817
Total liabilities, redeemable convertible preferred stock and stockholders’ equity	$416,337	$354,313

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, except Share data, unless otherwise specified
Net allowances on Accounts receivable	$67	$111
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	'	'
Preferred stock, shares outstanding	'	'
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	28,935,253	'
Common stock, shares outstanding	28,935,253	'

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2013		Dec. 29, 2012		Dec. 31, 2011
Revenue:	'		'		'
Product revenue	$477,444		$418,550		$426,525
Contract revenue	9,957		17,694		38,975
Total revenue	487,401		436,244		465,500
Cost of revenue:	'		'		'
Cost of product revenue(1)	262,224		234,102		240,930
Cost of revenue:	4,023		7,794		16,917
Total cost of revenue	266,247		241,896		257,847
Gross margin	221,154		194,348		207,653
Operating expenses:	'		'		'
Research and development(1)	63,649	[1]	57,066	[1]	60,100	[1]
Selling and marketing(1)	71,529	[1]	66,412	[1]	50,477	[1]
General and administrative(1)	53,358	[1]	45,698	[1]	43,753	[1]
Total operating expenses	188,536		169,176		154,330
Operating income	32,618		25,172		53,323
Other income (expense), net	-203		435		218
Income before income taxes	32,415		25,607		53,541
Income tax expense	4,774		8,310		13,350
Net income	27,641		17,297		40,191
Net income per share	'		'		'
Basic (Dollar per share)	$0.97		$0.63		$1.50
Diluted (Dollars per share)	$0.94		$0.61		$1.44
Number of shares used in per share calculations	'		'		'
Basic (In shares)	28,495		27,577		26,712
Diluted (In shares)	29,354		28,301		27,924
Stock-based compensation recorded in fiscal 2012, 2011, and 2010 breaks down by expense classification as follows:	'		'		'
Stock-based compensation	13,409		10,983		8,784
Cost of product revenue	'		'		'
Stock-based compensation recorded in fiscal 2012, 2011, and 2010 breaks down by expense classification as follows:	'		'		'
Stock-based compensation	700		889		1,069
Research and development	'		'		'
Stock-based compensation recorded in fiscal 2012, 2011, and 2010 breaks down by expense classification as follows:	'		'		'
Stock-based compensation	2,700		1,904		1,349
Selling and marketing	'		'		'
Stock-based compensation recorded in fiscal 2012, 2011, and 2010 breaks down by expense classification as follows:	'		'		'
Stock-based compensation	1,246		808		724
General and administrative	'		'		'
Stock-based compensation recorded in fiscal 2012, 2011, and 2010 breaks down by expense classification as follows:	'		'		'
Stock-based compensation	$8,763		$7,382		$5,642
[1]	Stock-based compensation recorded in fiscal 2013, 2012, and 2011 breaks down by expense classification as follows: Fiscal Year Ended December 28, 2013 December 29, 2012 December 31, 2011 (In thousands)Cost of product revenue$700 $889 $1,069Research and development2,700 1,904 1,349Selling and marketing1,246 808 724General and administrative8,763 7,382 5,642

Consolidated_Statement_of_Comp

Consolidated Statement of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]	'	'	'
Net income, as reported	$27,641	$17,297	$40,191
Other comprehensive income (loss), net of tax:	'	'	'
Unrealized gains (losses) on investments, net of tax	-52	48	71
Total comprehensive income	$27,589	$17,345	$40,262

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)
In Thousands, except Share data
Beginning balance at Jan. 01, 2011	$174,907	$258	$156,620	$17,949	$80
Beginning balance, shares at Jan. 01, 2011	'	25,844,840	'	'	'
Issuance of common stock for exercise of stock options, shares	1,232,721	1,232,721	'	'	'
Issuance of common stock for exercise of stock options, value	13,401	13	13,388	'	'
Vesting of restricted stock units, shares	'	167,875	'	'	'
Vesting of restricted stock units, value	0	'	'	'	'
Tax benefit of excess stock based compensation deduction	6,370	'	6,370	'	'
Amortization of deferred compensation relating to stock options	8,784	'	'	'	'
Deferred Compensation Arrangement with Individual, Compensation Expense	'	'	8,784	'	'
Stock withheld to cover tax withholdings requirements upon vesting of restricted stock units, shares	'	-28,881	'	'	'
Stock withheld to cover tax withholdings requirements upon vesting of restricted stock units, value	-928	'	-928	'	'
Unrealized gain on short term investment	71	'	'	'	71
Director's deferred compensation	162	'	162	'	'
Net income (loss)	40,191	'	'	40,191	'
Ending balance at Dec. 31, 2011	242,958	272	184,395	58,140	151
Ending balance, shares at Dec. 31, 2011	'	27,216,555	'	'	'
Issuance of common stock for exercise of stock options, shares	390,956	390,956	'	'	'
Issuance of common stock for exercise of stock options, value	4,326	4	4,322	'	'
Conversion of deferred compensation, shares	823	'	'	'	'
Vesting of restricted stock units, shares	'	204,053	'	'	'
Vesting of restricted stock units, value	0	-2	-2	'	'
Tax benefit of excess stock based compensation deduction	902	'	902	'	'
Amortization of deferred compensation relating to stock options	10,983	'	'	'	'
Deferred Compensation Arrangement with Individual, Compensation Expense	'	'	10,983	'	'
Stock withheld to cover tax withholdings requirements upon vesting of restricted stock units, shares	'	-30,728	'	'	'
Stock withheld to cover tax withholdings requirements upon vesting of restricted stock units, value	-784	'	-784	'	'
Unrealized gain on short term investment	48	'	'	'	48
Director's deferred compensation	87	'	87	'	'
Net income (loss)	17,297	'	'	17,297	'
Ending balance at Dec. 29, 2012	275,817	278	199,903	75,437	199
Ending balance, shares at Dec. 29, 2012	'	27,781,659	'	'	'
Issuance of common stock for exercise of stock options, shares	840,951	840,951	'	'	'
Issuance of common stock for exercise of stock options, value	13,629	8	13,621	'	'
Vesting of restricted stock units, shares	'	348,141	'	'	'
Vesting of restricted stock units, value	0	-3	-3	'	'
Tax benefit of excess stock based compensation deduction	1,413	'	1,413	'	'
Amortization of deferred compensation relating to stock options	13,409	'	'	'	'
Deferred Compensation Arrangement with Individual, Compensation Expense	'	'	13,409	'	'
Stock withheld to cover tax withholdings requirements upon vesting of restricted stock units, shares	'	-45,278	'	'	'
Stock withheld to cover tax withholdings requirements upon vesting of restricted stock units, value	-1,212	'	-1,212	'	'
Unrealized gain on short term investment	-52	'	'	'	-52
Director's deferred compensation	44	'	44	'	'
Net income (loss)	27,641	'	'	27,641	'
Ending balance at Dec. 28, 2013	$330,689	$289	$227,175	$103,078	$147
Ending balance, shares at Dec. 28, 2013	28,935,253	28,935,253	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Cash flows from operating activities:	'	'	'
Net income, as reported	$27,641	$17,297	$40,191
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'
Depreciation and amortization	12,169	11,672	10,312
Loss on disposal of property and equipment	189	1,332	599
Goodwill and Intangible Asset Impairment	1,988	0	0
Stock-based compensation	13,409	10,983	8,784
Increase (Decrease) in Deferred Income Taxes	-768	-3,763	6,154
Tax benefit of excess stock based compensation deductions	-2,406	-1,445	-6,917
Non-cash director deferred compensation	44	87	162
Changes in operating assets and liabilities — (use) source	'	'	'
Accounts receivable	-9,935	15,560	-9,282
Unbilled revenue	340	1,166	1,650
Inventory	-9,365	-807	-3,929
Other assets	1,980	-2,892	-1,843
Accounts payable	-1,743	-8,684	9,717
Accrued expenses	1,255	-656	1,421
Accrued compensation	7,751	-6,106	52
Deferred revenue	-1,172	4,730	-2,007
Long term liabilities	515	-613	671
Net cash provided by operating activities	41,892	37,861	55,735
Cash flows from investing activities:	'	'	'
Additions of property and equipment	-6,829	-6,770	-13,011
Payments for (Proceeds from) Other Investing Activities	-2,000	-6,000	0
Purchase of Evolution Robotics, Inc., net of cash received	0	-74,530	0
Purchase of investments	-17,946	-5,086	-9,189
Sales of investments	8,044	10,000	5,000
Proceeds from Sale of Other Productive Assets	650	0	0
Net cash used in investing activities	-18,081	-82,386	-17,200
Payments Related to Tax Withholding for Share-based Compensation	-1,212	-784	-928
Cash flows from financing activities:	'	'	'
Proceeds from stock option exercises	13,629	4,326	13,401
Tax benefit of excess stock based compensation deductions	2,406	1,445	6,917
Net cash provided by financing activities	14,823	4,987	19,390
Net increase (decrease) in cash and cash equivalents	38,634	-39,538	57,925
Cash and cash equivalents, at beginning of period	126,770	166,308	108,383
Cash and cash equivalents, at end of period	165,404	126,770	166,308
Supplemental disclosure of cash flow information	'	'	'
Cash paid for income taxes	7,235	11,663	8,046
Noncash investing activity, transfer of inventory to property and equipment	223	0	0
Noncash or Part Noncash Acquisition, Fixed Assets Acquired	$572	$0	$0

Nature_of_the_Business

Nature of the Business	12 Months Ended
	Dec. 28, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Nature of the Business	'
	1	Nature of the 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	12 Months Ended
	Dec. 28, 2013
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 consolidated financial statements in conformity with accounting principles generally accepted in the United States of America.
	Reorganization
	In fiscal year 2012, the Company initiated a reorganization that resulted in, among other things, the centralization of all of the Company's engineering and operations activities. This reorganization was completed at the beginning of fiscal year 2013. In conjunction with this reorganization, the Company reviewed the financial statement classification of its costs and expenses. As a result of this review, the Company decided to classify certain expenses differently than had been classified and presented in prior periods to provide a more clear understanding of the Company's financial performance. As part of this review, the Company also evaluated the impact of the reorganization on its segment reporting and determined that certain modifications were necessary to present the segment information as now viewed by the Company's chief operating decision maker. Although the classification of certain expenses on the income statement has changed in fiscal year 2013 as compared to prior periods, the Company recast the financial results of prior periods in a manner consistent with the fiscal year 2013 presentation for comparability purposes. The reclassified amounts reflected in the consolidated statements of income for the years ended December 29, 2012 and December 31, 2011 included herein conform to the fiscal year 2013 presentation. This reclassification of costs and expenses did not impact previously reported net income or earnings per share as the changes only impacted the categorization of costs within the consolidated statements of income for the periods in question. Consequently, the classification changes did not impact previously presented consolidated balance sheets, statements of cash flow or statements of stockholders' equity.
	Revision of Consolidated Balance Sheet as of December 29, 2012
	During the three month period ended March 30, 2013, the Company identified a classification error related to its reserves for uncertain tax positions on its December 29, 2012 consolidated balance sheet. The Company had recorded a gross income tax receivable in current assets and a gross uncertain tax positions liability against that receivable in current liabilities as of December 29, 2012. In addition, the Company misclassified certain liabilities for uncertain tax positions in current and long-term liabilities. The impact of the errors on the December 29, 2012 consolidated balance sheet was a decrease in Other Current Assets of $2.7 million, an increase in Other Assets of $0.2 million, a decrease in Accrued Expenses of $2.9 million, and an increase in Long-term Liabilities of $0.4 million. These adjustments were not considered to be material, individually or in the aggregate, to previously issued financial statements. The Company has revised its December 29, 2012 consolidated balance sheet to correct these errors as reflected herein. This revision had no impact on the consolidated statement of income, the consolidated statement of comprehensive income, or total cash flows from operating activities, investing activities, or financing activities.
	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 will end on the Saturday that falls closest to the last day of the third month of each quarter.
	Cash and Cash Equivalents
	The Company considers all highly liquid investments with an original or remaining maturity of three months or less at the time of purchase to be cash equivalents. The Company invests its excess cash primarily in money market funds or savings accounts of major financial institutions. Accordingly, its cash equivalents are subject to minimal credit and market risk. At December 28, 2013 and December 29, 2012, cash equivalents were comprised of money market funds totaling $101.4 million and $88.1 million, respectively. These cash equivalents are carried at cost, which approximates fair value.
	Short Term Investments
	The Company’s investments are classified as available-for-sale and are recorded at fair value with any unrealized gain or loss recorded as an element of stockholders’ equity. The fair value of investments is determined based on quoted market prices at the reporting date for those instruments. As of December 28, 2013 and December 29, 2012, investments consisted of:
		December 28,						December 29,
		2013						2012
		Cost			Fair			Cost			Fair
					Market Value						Market Value
		(In thousands)
	Corporate and government bonds	$	22,134		$	21,954		$	12,980		$	12,430
	Total short term investments	$	22,134		$	21,954		$	12,980		$	12,430
	As of December 28, 2013, the Company’s investments had maturity dates ranging from November 2014 to March 2017. The Company invests primarily in investment grade securities and limits the amount of investment in any single issuer.
	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 provisional 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 December 28, 2013, 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.
	Allowance for Doubtful Accounts
	The Company maintains an allowance for doubtful accounts to provide for the estimated amount of accounts receivable that may not be collected. The allowance is based upon an assessment of customer creditworthiness, historical payment experience and the age of outstanding receivables.
	Activity related to the allowance for doubtful accounts was as follows:
		Fiscal Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
		(In thousands)
	Balance at beginning of period	$	111		$	87		$	88
	Provision	—			37			—
	Deduction(*)	(44		)	(13		)	(1		)
	Balance at end of period	$	67		$	111		$	87
	_____________________
	(*)	Deductions related to allowance for doubtful accounts represent amounts written off against the allowance, less recoveries.
	Inventory
	Inventory is stated at the lower of cost or net realizable value with cost being determined using the first-in, first-out (FIFO) method. The Company maintains a reserve for inventory items to provide for an estimated amount of excess or obsolete inventory.
	Activity related to the inventory reserve was as follows:
		Fiscal Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
		(In thousands)
	Balance at beginning of period	$	6,608		$	2,568		$	2,836
	Provision	1,571			5,101			411
	Deduction(*)	(2,899		)	(1,061		)	(679		)
	Balance at end of period	$	5,280		$	6,608		$	2,568
	___________________________
	(*)	Deductions related to inventory reserve accounts represent amounts written off against the reserve.
	Property and Equipment
	Property and equipment are recorded at cost and consist primarily of computer equipment, leasehold improvements, business applications software and machinery. Depreciation is computed using the straight-line method over the estimated useful lives as follows:
		Estimated
		Useful Life
	Computer and research equipment	3 years
	Furniture	5
	Machinery	5-Feb
	Tooling	5-Feb
	Business applications software	7-May
	Capital leases and leasehold improvements	Term of lease
	Expenditures for additions, renewals and betterments of plant and equipment are capitalized. Expenditures for repairs and maintenance are charged to expense as incurred. As assets are retired or sold, the related cost and accumulated depreciation are removed from the accounts and any resulting gain or loss is credited or charged to operations.
Long-Lived Assets, including Purchased Intangible Assets
The Company periodically evaluates the recoverability of long-lived assets, including other purchased intangible assets whenever events and changes in circumstances, such as reductions in demand or significant economic slowdowns in the industry, indicate that the carrying amount of an asset may not be fully recoverable. When indicators of impairment are present, the carrying values of the asset group are evaluated in relation to the future undiscounted cash flows of the underlying business. The net book value of the underlying asset is adjusted to fair value if the sum of the expected discounted cash flows is less than book value. Fair values are based on estimates of market prices and assumptions concerning the amount and timing of estimated future cash flows and assumed discount rates, reflecting varying degrees of perceived risk.
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 each year.
Research and Development
Costs incurred in the research and development of the Company’s products, classified as cost of contract and research and development, are expensed as incurred.
Internal Use Software
The Company capitalizes costs associated with the development and implementation of software for internal use. At December 28, 2013 and December 29, 2012, the Company had $8.2 million and $8.3 million, respectively, of costs related to enterprise-wide software included in fixed assets. Capitalized costs are being amortized over the assets’ estimated useful lives. The Company has recorded $0.9 million, $1.0 million and $0.9 million of amortization expense for the years ended December 28, 2013, December 29, 2012 and December 31, 2011, respectively.
Concentration of Credit Risk and Significant Customers
Financial instruments which potentially expose the Company to concentrations of credit risk consist of accounts receivable. Management believes its credit policies are prudent and reflect normal industry terms and business risk. At December 28, 2013, two customers accounted for a total of 37% of the Company's accounts receivable balance, each of which was greater than 10% of the balance and each of whom secured their balance with guaranteed letters of credit. At December 29, 2012, three customers accounted for a total of 55% of the Company’s accounts receivable balance, each of which was greater than 10% of the balance. Two of the customers accounting for 36% of the Company’s accounts receivable balance secured their balance with guaranteed letters of credit. For the years ended December 28, 2013, December 29, 2012 and December 31, 2011, revenue from U.S. federal government orders, contracts and subcontracts, represented 6.2%, 15.1% and 36.1% of total revenue, respectively. For the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011, the Company generated an aggregate of 33.2%, 30.6% and 23.6%, respectively, of total revenue from its home robots distributor in Japan and a network of affiliated European distributors of its home robots.
The Company maintains its cash in bank deposit accounts at high quality financial institutions. The individual balances, at times, may exceed federally insured limits.
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 and restricted stock units is measured based on the closing fair market value of the Company’s common stock on the date of grant. The Company recognizes stock-based compensation cost as expense ratably on a straight-line basis over the requisite service period, net of estimated forfeitures.
Advertising Expense
The Company expenses advertising costs as they are incurred. During the years ended December 28, 2013, December 29, 2012 and December 31, 2011 advertising expense totaled $38.2 million, $34.9 million and $20.4 million, respectively.
Net Income Per Share
The following table presents the calculation of both basic and diluted net income per share:
	Fiscal Year Ended
	December 28,			December 29,			December 31,
	2013			2012			2011
Net income	$	27,641		$	17,297		$	40,191
Weighted-average shares outstanding	28,495			27,577			26,712
Dilutive effect of employee stock options and restricted shares	859			724			1,212
Diluted weighted average shares outstanding	29,354			28,301			27,924
Basic income per share	$	0.97		$	0.63		$	1.5
Diluted income per share	$	0.94		$	0.61		$	1.44
Potentially dilutive securities representing approximately 0.7 million, 0.8 million and 0.4 million shares of common stock for the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011, 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 years prior to 2010, the IRS has completed and closed its examination for all fiscal periods 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 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.
In fiscal 2012, as part of the Company's acquisition accounting for the acquisition of Evolution Robotics, Inc., the Company recorded a valuation allowance of $2.7 million related to certain state tax attributes of Evolution Robotics, Inc. In fiscal 2013, the deferred tax asset and related valuation allowance were reduced by $0.6 million based on the final computation of certain pre-acquisition state tax attributes of Evolution Robotics, Inc. At December 28, 2013, the Company maintains a net valuation allowance of $2.1 million.
Comprehensive Income
Accumulated other comprehensive income includes unrealized gains and losses on certain investments. The differences between net income and comprehensive income were related to unrealized gains (losses) on investments, net of tax.
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 December 28, 2013, were as follows:
	Fair Value Measurements as of
	December 28, 2013
Description	Level 1			Level 2			Level 3
	(In thousands)
Assets:
Money market funds	$	101,441		$	—		$	—
Corporate and government bonds	—			21,954			—
Total assets measured at fair value	$	101,441		$	21,954		$	—
The Company’s financial assets measured at fair value on a recurring basis at December 29, 2012, were as follows:
	Fair Value Measurements as of
	December 29, 2012
Description	Level 1			Level 2			Level 3
	(In thousands)
Assets:
Money market funds	$	88,144		$	—		$	—
Corporate bonds	—			12,430			—
Total assets measured at fair value	$	88,144		$	12,430		$	—
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 and realized and unrealized gains and losses are included in comprehensive income for that period. The fair value of the Company’s bond investments are included in short term investments in its consolidated balance sheets.
Non-financial Assets
The Company's non-financial assets, which include goodwill, intangible assets, and property, plant and equipment are not required to be measured at fair value on a recurring basis. However, the Company evaluates the non-financial assets for impairment if a trigger event occurs, or when an annual impairment test is performed. If the asset is determined to be impaired, the asset is required to be recorded at fair value.
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.  We are currently assessing the impact, if any, on our consolidated financial statements.
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 the impact of recently issued standards, which are not yet effective, will not have a material impact on its consolidated financial statements upon adoption.

Inventory

Inventory	12 Months Ended
	Dec. 28, 2013
Inventory Disclosure [Abstract]	'
Inventory	'
	3	Inventory
	Inventory consists of the following at:
		December 28,		December 29,
		2013		2012
		(In thousands)
	Raw materials	$	8,520	$	8,849
	Work in process	—		60
	Finished goods	37,587		28,056
		$	46,107	$	36,965

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 28, 2013
Property, Plant and Equipment [Abstract]	'
Property and Equipment	'
	4	Property and Equipment
	Property and equipment consists of the following at:
		December 28,		December 29,
		2013		2012
		(In thousands)
	Computer and equipment	$	13,715	$	16,086
	Furniture	1,845		2,762
	Machinery	3,705		3,391
	Tooling	12,228		10,147
	Leasehold improvements	15,983		15,758
	Business applications software	8,162		8,273
		55,638		56,417
	Less: accumulated depreciation	31,977		31,464
		$	23,661	$	24,953
	Depreciation expense for the years ended December 28, 2013, December 29, 2012 and December 31, 2011 was $8.1 million, $9.9 million, and $9.0 million, respectively.

Other_Assets

Other Assets	12 Months Ended
	Dec. 28, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]	'
Other Assets	'
	5	Other Assets
	Other assets consists of the following at:
		December 28,		December 29,
		2013		2012
		(In thousands)
	Investment in Advanced Scientific Concepts, Inc.	$	2,500	$	2,500
	Investment in InTouch Technologies, Inc.	8,001		6,000
		$	10,501	$	8,500
	In November 2007, the Company recorded an investment of $2.5 million in a series of preferred stock of Advanced Scientific Concepts, Inc. In January 2012, the Company recorded an investment of $6.0 million in a series of preferred stock of InTouch Technologies, Inc. ("InTouch"). In January 2013, the Company recorded an additional investment of $2.0 million of preferred stock of InTouch, bringing its total investment to $8.0 million. These investments are accounted for at cost. The Company regularly monitors these investments to determine if facts and circumstances have changed in a manner that would require a change in accounting methodology. Additionally, the Company regularly evaluates whether or not these investments have been impaired by considering such factors as economic environment, market conditions, operational performance and other specific factors relating to the businesses underlying the investments. If any such impairment is identified, a reduction in the carrying value of the investments would be recorded at that time. Since the Company believes the fair value of its investments is greater than the carrying value of its investments, it has not impaired these investments.

Accrued_Expenses

Accrued Expenses	12 Months Ended
	Dec. 28, 2013
Accrued Liabilities, Current [Abstract]	'
Accrued Expenses	'
	6	Accrued Expenses
	Accrued expenses consist of the following at:
		December 28,		December 29,
		2013		2012
		(In thousands)
	Accrued warranty	$	6,497	$	6,057
	Accrued direct fulfillment costs	1,362		999
	Accrued sales tax	831		719
	Accrued rent	726		696
	Accrued sales commissions	539		475
	Accrued contractors	509		196
	Accrued other	4,416		4,500
		$	14,880	$	13,642
	Accrued compensation consists of the following at:
		December 28,		December 29,
		2013		2012
		(In thousands)
	Accrued bonus	$	13,002	$	5,186
	Accrued other compensation	6,604		6,678
		$	19,606	$	11,864

Revolving_Line_of_Credit

Revolving Line of Credit	12 Months Ended
	Dec. 28, 2013
Debt Disclosure [Abstract]	'
Revolving Line of Credit	'
	7	Revolving Line of Credit
	The Company has an unsecured revolving credit facility with Bank of America, N.A., which is available to fund working capital and other corporate purposes. As of December 28, 2013, the total amount available for borrowing under its credit facility was $75.0 million and the full amount was available for borrowing. The interest on loans under the credit facility will accrue, at the Company's election, at either (1) LIBOR plus a margin, currently equal to 1.0%, based on the Company's ratio of indebtedness to Adjusted EBITDA (the "Eurodollar Rate"), or (2) the lender's base rate. The lender's base rate is equal to the highest of (1) the federal funds rate plus 0.5%, (2) the lender's prime rate and (3) the Eurodollar Rate plus 1.0%. The credit facility will terminate and all amounts outstanding thereunder will be due and payable in full on December 20, 2018.
	As of December 28, 2013, the Company had no borrowings under its revolving credit facility. This credit facility contains customary terms and conditions for credit facilities of this type, including restrictions on the Company's ability to incur or guaranty additional indebtedness, create liens, enter into transactions with affiliates, make loans or investments, sell assets, pay dividends or make distributions on, or repurchase, the Company's stock, and consolidate or merge with other entities.
	In addition, the Company is required to meet certain financial covenants customary with this type of agreement, including maintaining a minimum ratio of indebtedness to Adjusted EBITDA and a minimum specified interest coverage ratio.
	This credit facility contains customary events of default, including for payment defaults, breaches of representations, breaches of affirmative or negative covenants, cross defaults to other material indebtedness, bankruptcy and failure to discharge certain judgments. If a default occurs and is not cured within any applicable cure period or is not waived, the Company's obligations under the credit facility may be accelerated.
	As of December 28, 2013, the Company was in compliance with all covenants under its credit facility.

Common_Stock

Common Stock	12 Months Ended
	Dec. 28, 2013
Dividends, Common Stock [Abstract]	'
Common Stock	'
	8	Common Stock
	Common stockholders are entitled to one vote for each share held and to receive dividends if and when declared by the Board of Directors and subject to and qualified by the rights of holders of the preferred stock. Upon dissolution or liquidation of the Company, holders of common stock will be entitled to receive all available assets subject to any preferential rights of any then outstanding preferred stock.
	On February 25, 2013, the Company announced a stock repurchase program. Under the program, the Company may purchase up to $25 million of its common stock from March 28, 2013 to March 27, 2014. The Company had made no repurchases under the program as of December 28, 2013.

Stock_Options_Plans_and_StockB

Stock Options Plans and Stock-Based Compensation	12 Months Ended
	Dec. 28, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock Options Plans and Stock-Based Compensation	'
	9	Stock Option Plans and Stock-Based Compensation
	The Company has options outstanding under four stock incentive plans: the 1994 Stock Option Plan (the “1994 Plan”), 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 1994 Plan, the 2004 Plan and the 2005 Plan, the “Plans”). The 2005 Plan is the only one of the four 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 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 December 28, 2013, there were 4,003,676 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 typically 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.
	In conjunction with the acquisition of Evolution Robotics, Inc. on October 1, 2012, each outstanding and unvested incentive stock option held by Evolution employees as of the acquisition date was automatically converted into stock options of the Company under the same terms and conditions as were applicable to the original Evolution grants. The number of replacement options granted and the associated exercise prices were determined utilizing a conversion ratio as defined in the merger agreement. There were 114,248 incentive stock options issued by the Company as a result of this automatic conversion with exercise prices ranging from $2.55 to $4.81. All of these options were granted from the 2007 Plan, which was assumed by the Company as a result of the acquisition.
	The Company recognized $4.8 million of stock-based compensation expense during the fiscal year ended December 28, 2013 for stock options. The unamortized fair value as of December 28, 2013 associated with these grants was $7.2 million with a weighted-average remaining recognition period of 2.44 years. The Company expects to recognize associated stock-based compensation expense of $3.5 million, $2.1 million, $1.4 million and $0.2 million in 2014, 2015, 2016 and 2017, respectively.
	The fair value of each option grant for the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011 was computed on the grant date using the Black-Scholes option-pricing model with the following assumptions:
		Fiscal Year Ended
		December 28,		December 29,		December 31,
		2013		2012		2011
	Risk-free interest rate	0.90% — 1.77%		0.63% — 0.90%		0.83% — 2.24%
	Expected dividend yield	—		—		—
	Expected life	4.03 — 4.21 years		4.12 — 4.18 years		4.11 — 4.31 years
	Expected volatility	54.0% — 58.0%		63.0% — 64.0%		61.0% — 63.0%
	The risk-free interest rate is derived from the average U.S. Treasury constant maturity rate, which approximates the rate in effect at the time of grant, commensurate with the expected life of the instrument. The dividend yield is zero based upon the fact the Company has never paid and has no present intention to pay cash dividends. The Company utilizes company specific historical data for purposes of establishing expected volatility and expected term.
	Based upon the above assumptions, the weighted average fair value of each stock option granted for the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011 was $11.17, $13.23 and $16.55, respectively.
	The table below summarizes stock option plan activity:
		Number of			Weighted Average			Weighted  Average	Aggregate
		Shares			Exercise Price			Remaining	Intrinsic
								Contractual Term	Value(1)
	Outstanding at January 1, 2011	3,657,035			$	13.4
	Granted	349,650			33.27
	Exercised	(1,232,721	)		10.87
	Canceled	(212,672	)		15.37
	Outstanding at December 31, 2011	2,561,292			$	17.17
	Granted	547,948			19.7
	Exercised	(390,956	)		11.07
	Canceled	(214,617	)		21.91
	Outstanding at December 29, 2012	2,503,667			$	18.27
	Granted	293,325			24.6
	Exercised	(840,951	)		16.21
	Canceled	(185,666	)		22.16
	Outstanding at December 28, 2013	1,770,375			$	19.89		3.99 years	$27.5 million
	Vested and expected to vest at December 28, 2013	1,718,644			$	19.78		3.93 years	$26.9 million
	Exercisable as of December 28, 2013	1,069,247			$	18.04		2.90 years	$18.6 million
	Weighted average fair value of options granted during the fiscal year ended December 28, 2013				$	11.17
	Options available for future grant at December 28, 2013	4,003,676
	_________________________
	-1	The aggregate intrinsic value on the table was calculated based upon the positive difference between the closing market value of the Company’s stock on December 28, 2013 of $35.41 and the exercise price of the underlying option.
	During fiscal years 2013, 2012, and 2011, the total intrinsic value of stock options exercised was $12.1 million, $6.2 million and $25.4 million, respectively. No amounts relating to stock-based compensation have been capitalized.
	The following table summarizes information about stock options outstanding at December 28, 2013:
			Options Outstanding							Options Exercisable
	Range of Exercise Prices		Number			Weighted Average	Weighted  Average			Number	Weighted Average
			Outstanding			Remaining	Exercise Price			Exercisable	Exercise Price
						Contractual Life
	$  2.33 - $ 7.76		207,041			4.11 years	$	5.65		157,154	$	6
	8.10 - 14.13		137,474			1.97	13.04			137,474	13.04
	14.52 - 14.52		246,122			3.13	14.52			200,541	14.52
	14.54 - 18.47		270,991			3.98	17.62			166,930	17.09
	18.61 - 22.20		100,970			2.24	20.62			89,246	20.72
	22.86 - 22.86		221,657			6.07	22.86			4,107	22.86
	24.00 - 25.99		244,975			3.82	24.86			146,955	24.5
	26.59 - 33.48		293,345			4.38	30.77			164,308	31.37
	33.72 - 34.67		43,300			6.57	33.98			—	—
	35.96 -  35.96		4,500			4.51	35.96			2,532	35.96
	$ 2.33 -  $35.96		1,770,375			3.99 years	$	19.89		1,069,247	$	18.04
	The table below summarizes activity relating to restricted stock awards:
		Number of			Weighted Average
		Shares Underlying			Grant Date Fair
		Restricted Stock			Value
	Outstanding at January 1, 2011	5,582			$	16.03
	Granted
	Vested	(5,582	)		16.03
	Forfeited
Outstanding at December 31, 2011	—			$	—
Granted
Vested	—			—
Forfeited
Outstanding at December 29, 2012	—			$	—
Granted
Vested	—			—
Forfeited
Outstanding at December 28, 2013	—			$	—
During the fiscal year ended December 28, 2013, the Company recognized $0.0 million of stock based compensation expense associated with restricted stock awards. As of December 28, 2013, the unamortized fair value of all restricted stock awards was $0.0 million.
The table below summarizes activity relating to restricted stock units:
	Number of			Weighted Average
	Shares Underlying			Grant Date Fair
	Restricted Stock			Value
Outstanding at January 1, 2011	570,077			$	15.14
Granted	282,744			32.08
Vested	(168,041	)		15.31
Forfeited	(77,275	)		16.73
Outstanding at December 31, 2011	607,505			$	22.77
Granted	685,529			24.62
Vested	(204,053	)		21.24
Forfeited	(147,951	)		25.07
Outstanding at December 29, 2012	941,030			$	24.09
Granted	521,056			25.87
Vested	(348,141	)		22.57
Forfeited	(186,291	)		24.91
Outstanding at December 28, 2013	927,654			$	25.5
During the fiscal year ended December 28, 2013, the Company recognized $8.6 million of stock based compensation expense associated with restricted stock units. As of December 28, 2013, December 29, 2012 and December 31, 2011, the unamortized fair value of all restricted stock units was $17.5 million, $17.9 million and $11.7 million, respectively. The Company expects to recognize associated stock-based compensation expense of $7.6 million, $5.3 million, $3.6 million and $1.0 million in 2014, 2015, 2016 and 2017, respectively.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 28, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	10	Income Taxes
	The components of income tax expense were as follows:
		Fiscal Year Ended
		December 28,			December 29,				December 31,
		2013			2012				2011
		(In thousands)
	Current
	Federal	$	6,363		$	12,540			$	10,088
	State	1,124			473				1,600
	Foreign	41			(8		)		196
	Total current tax provision	7,528			13,005				11,884
	Deferred
	Federal	(2,026		)	(4,003		)		2,166
	State	(728		)	(692		)		(700		)
	Total deferred tax provision	(2,754		)	(4,695		)		1,466
	Total income tax provision	$	4,774		$	8,310			$	13,350
	In certain jurisdictions, an insignificant provision has been made for deferred taxes on undistributed earnings of non-U.S. subsidiaries that the Company expects to distribute in 2014. In other jurisdictions, for the remaining undistributed earnings of non-U.S. subsidiaries, no provision has been made for deferred taxes as these earnings have been indefinitely reinvested. As of December 28, 2013, a deferred tax liability has not been established for approximately $0.4 million of cumulative undistributed earnings of non-U.S. subsidiaries, as the Company plans to keep these amounts permanently reinvested overseas. Determination of the amount of unrecognized deferred tax liability on these undistributed earnings is not practicable and such amount would not be material.
	The components of net deferred tax assets were as follows:
		December 28,			December 29,
		2013			2012
		(In thousands)
	Net deferred tax assets
	Current deferred tax assets
	Reserves and accruals	$	18,554		$	17,273
	Stock-based compensation	556			1,784
	Net operating loss carryforwards	2,470			2,470
	Foreign tax credits	105			133
	Valuation allowance	(1,100		)	(1,390		)
	Total current deferred tax assets	20,585			20,270
	Non-current deferred tax assets
	Reserves and accruals	715			182
	Tax credits	5,737			4,780
	Fixed assets	1,308			280
	Stock-based compensation	4,957			4,851
	Net operating loss carryforwards	6,587			9,664
	Valuation allowance	(990		)	(1,301		)
	Total non-current deferred tax assets	18,314			18,456
	Current deferred tax liabilities
	Prepaids	441			649
	Total current deferred tax liabilities	441			649
	Non-current deferred tax liabilities
	Intangible assets	8,219			10,019
	Total non-current deferred tax liabilities	8,219			10,019
	Total net deferred tax assets	$	30,239		$	28,058
	In fiscal 2012, as part of the Company's acquisition accounting for the acquisition of Evolution Robotics, Inc., the Company recorded a valuation allowance of $2.7 million related to certain state tax attributes of Evolution Robotics, Inc. In fiscal 2013, the deferred tax asset and related valuation allowance were reduced by $0.6 million based on the final computation of certain pre-acquisition state tax attributes of Evolution Robotics, Inc. At December 28, 2013, the Company has a total net valuation allowance of $2.1 million.
	The table below summarizes activity relating to the valuation allowance:
	Fiscal Year Ended	Balance at			Additions			Additions Charged to Goodwill			Deductions	Balance
		beginning  of			Charged to							at End
		period			Costs and							of Period
					Expenses
		(In thousands)
	December 31, 2011	$	—		—			—			—	$	—
	December 29, 2012	$	—		—			2,691			—	$	2,691
	December 28, 2013	$	2,691		—			—			601	$	2,090
	The net deferred tax assets after valuation allowance as of December 28, 2013 and December 29, 2012 were $30.2 million and $28.1 million, respectively.
	As of December 28, 2013, the Company has net operating loss carryforwards available to offset future federal and state taxes of $45.0 million, research and development credit carryforwards available to offset future federal and state taxes of $8.9 million and investment tax credit carryforwards to offset future state taxes of $0.6 million, which expire at various dates from 2016 to 2033. As of December 29, 2012, the Company had net operating loss carryforwards available to offset future federal and state taxes of $62.9 million, research and development credit carryforwards available to offset future federal and state taxes of $7.4 million, and investment tax credit carryforwards to offset future state taxes of $0.6 million, which expire at various dates from 2013 to 2032. Under the Internal Revenue Code, certain substantial changes in the Company’s ownership could result in an annual limitation on the amount of these tax carryforwards which can be utilized in future years. As of December 28, 2013, the Company has $45.0 million of net operating loss carryforwards and $2.2 million of federal and state research and development credits related to the acquisition of Evolution Robotics that are limited by Section 382 and Section 383, respectively, of the Internal Revenue Code. However, these limitations are not expected to cause any of these net operating loss carryforwards or federal and state research and development credits to expire unused.
	The reconciliation of the expected tax (benefit) expense (computed by applying the federal statutory rate to income before income taxes) to actual tax expense was as follows:
		Fiscal Year Ended
		December 28,			December 29,				December 31,
		2013			2012				2011
		(In thousands)
	Expected federal income tax	$	11,345		$	8,962			$	18,739
	Miscellaneous permanent items	405			338				(13		)
State taxes (net of federal benefit)	867			497				543
Federal and state credits	(3,909		)	(418		)		(3,283		)
Domestic production activities deduction	(1,168		)	(1,100		)		(2,695		)
Other	(70		)	31				59
Settlement of uncertain tax positions	(2,696		)	—				—
	$	4,774		$	8,310			$	13,350
A summary of the Company’s adjustments to its gross unrecognized tax benefits, inclusive of interest, in the current year is as follows:
	Fiscal Year Ended
	December 28, 2013
Balance at beginning of period	$	4,469
Increase for tax positions related to the current year	355
Increase for tax positions related to prior years	490
Decreases for settlements with applicable taxing authorities	(2,696		)
Decreases for lapses of statute of limitations	—
Balance at end of period	$	2,618
The Company recognizes interest and penalties related to unrecognized tax benefits in its income tax provision. As of December 28, 2013, December 29, 2012 and December 31, 2011, there were no material amounts related to accrued interest or penalties. We anticipate the settlement of tax audits may be finalized within the next twelve months and could result in a decrease in our unrecognized tax benefits of up to $0.7 million. If all of our unrecognized tax benefits as of December 28, 2013 were to become recognizable in the future, we would record a $1.9 million benefit to the income tax provision, reflective of federal benefit on state items.
Included in the Company’s state tax credit carryforwards as of December 28, 2013 and December 29, 2012 were unrecognized tax benefits related to stock-based compensation beginning from January 1, 2006 of $0.5 million and $0.5 million, respectively, which will be credited to additional paid-in capital when they reduce income taxes payable. Therefore, these amounts were not included in the Company’s gross or net deferred tax assets at December 28, 2013 and December 29, 2012.
The Company follows the with and without approach for direct and indirect effects of windfall tax deductions.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 28, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	11	Commitments and Contingencies
	Legal
	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 the Company's financial condition or results of operations.
	Lease Obligations
	The Company leases its facilities. Rental expense under operating leases for fiscal 2013, 2012 and 2011 amounted to $5.3 million, $4.4 million, and $4.1 million, respectively. Future minimum rental payments under operating leases were as follows as of December 28, 2013:
		Operating
		Leases
	2013	$	3,396
	2014	3,363
	2015	2,662
	2016	2,383
	2017	2,383
	Thereafter	3,177
	Total minimum lease payments	$	17,364
	Outstanding Purchase Orders
	At December 28, 2013, we had outstanding purchase orders aggregating approximately $93.2 million. The purchase orders, the majority of which are with our 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 software. 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 December 28, 2013 and December 29, 2012, respectively.
	Government Contract Contingencies
	Several of the Company’s prime contracts with the U.S. federal government do not contain a limitation of liability provision, creating a risk of responsibility for direct and consequential damages. Several subcontracts with prime contractors hold the prime contractor harmless against liability that stems from our work and do not contain a limitation of liability. These provisions could cause substantial liability for the Company. In addition, the Company is subject to audits by the U.S. federal government as part of routine audits of government contracts. As part of an audit, these agencies may review the Company’s performance on contracts, cost structures and compliance with applicable laws, regulations and standards. If any of its costs are found to be allocated improperly to a specific contract, the costs may not be reimbursed and any costs already reimbursed for such contract may have to be refunded. Accordingly, an audit could result in a material adjustment to our revenue and results of operations. Annually, the Company submits final indirect billing rates to DCMA based upon actual costs incurred throughout the year. These final billing rates are subject to audit by DCAA. As of December 28, 2013, fiscal year 2007 is under audit by DCAA, and fiscal years 2008 through 2013 are open for audit by DCAA.
	Warranty
	The Company provides warranties on most products and has established a reserve for warranty based on identified warranty costs. The reserve is included as part of accrued expenses (Note 6) in the accompanying consolidated balance sheets.
	Activity related to the warranty accrual was as follows:
		Fiscal Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
		(In thousands)
	Balance at beginning of period	$	6,057		$	10,306		$	9,284
	Provision (*)	1,744			(1,682		)	4,091
	Warranty usage(**)	(1,304		)	(2,567		)	(3,069		)
	Balance at end of period	$	6,497		$	6,057		$	10,306
	__________________________________
	(*)	During 2012, the Company recorded favorable adjustments relating to reductions in its international warranty accrual for our home robots business related to our sustained improvements in product quality, resulting in a net credit for its 2012 warranty provision.
	(**)	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 a 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.

Employee_Benefits

Employee Benefits	12 Months Ended
	Dec. 28, 2013
Employee Benefits [Abstract]	'
Employee Benefits	'
	12	Employee Benefits
	The Company sponsors a retirement plan under Section 401(k) of the Internal Revenue Code (the “Retirement Plan”). All Company employees, with the exception of temporary, contract and international employees are eligible to participate in the Retirement Plan after satisfying age and length of service requirements prescribed by the plan. Under the Retirement Plan, employees may make tax-deferred contributions, and the Company, at its sole discretion, and subject to the limits prescribed by the IRS, may make either a nonelective contribution on behalf of all eligible employees or a matching contribution on behalf of all plan participants.
	The Company elected to make a matching contribution of approximately $1.5 million, $1.7 million and $1.7 million for the plan years ended December 28, 2013, December 29, 2012 and December 31, 2011 (“Plan-Year 2013,” “Plan-Year 2012” and “Plan-Year 2011”), respectively. The employer contribution represents a matching contribution at a rate of 50% of each employee’s first six percent contribution. Accordingly, each employee participating during Plan-Year 2013, Plan-Year 2012 and Plan-Year 2011 is entitled up to a maximum of three percent of his or her eligible annual payroll. The employer matching contribution for Plan-Year 2013 is included in accrued compensation in the accompanying consolidated balance sheet.

Acquisition_of_Evolution_Robot

Acquisition of Evolution Robotics, Inc.	12 Months Ended
	Dec. 28, 2013
Business Combinations [Abstract]	'
Acquisition of Evolution Robotics, Inc.	'
	13	Acquisition of Evolution Robotics, Inc.
	On October 1, 2012, the Company acquired 100% of the equity of Evolution Robotics, Inc. (Evolution) for $74.8 million in cash, including the effect of working capital adjustments and cash received, with $8.88 million of the purchase price placed into an escrow account to settle certain claims for indemnification for breaches or inaccuracies in Evolution’s representations and warranties, covenants and agreements. Evolution was the developer of Mint and Mint Plus automatic floor cleaning robots, based in Pasadena, California, and is included in the Company's home robots business unit.
	Pro Forma Disclosures (Unaudited)
	The following unaudited pro forma consolidated results of operations for fiscal 2012 and fiscal 2011 assume that the acquisition of Evolution occurred as of January 2, 2011.
		Fiscal Year Ended
		December 29,		December 31,
		2012		2011
		(In thousands)
	Revenue	$	445,469	$	482,850
	Net Income	8,723		31,778
	These pro forma amounts do not purport to be indicative of the results that would have actually been obtained if the acquisitions had occurred at the beginning of the periods presented or that may be obtained in the future.

Goodwill_and_other_intangible_

Goodwill and other intangible assets	12 Months Ended
	Dec. 28, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and other intangible assets	'
	14	Goodwill and other intangible assets
	The carrying amount of the goodwill at December 28, 2013 is $48.8 million. $41.0 million resulted from the acquisition of Evolution Robotics, Inc. in October 2012 and was assigned to the home robots reporting unit. $7.7 million (net of a subsequent write-down of $0.2 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 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.
	During the second quarter of 2013, the Company decided to refocus its funded research activities. The Company considered this decision to be an impairment indicator, requiring an interim impairment test within the research reporting unit. The Company performed an impairment assessment using the income approach, and determined that goodwill was impaired. The Company recorded an impairment loss of $0.2 million within general and administrative expenses during the fiscal year ended December 28, 2013.
	In the fourth quarter of 2013, the Company completed its annual goodwill impairment test. The first step of the two-step impairment test, which involves comparing the fair values of the applicable reporting units with their aggregate carrying values, including goodwill, was completed, and the Company did not identify any additional goodwill impairment.
	Other intangible assets include the value assigned to completed technology, research contracts, and trade names. 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 estimated economic benefits of the intangible assets are expected to be utilized.
	Intangible assets at December 28, 2013 and December 29, 2012 consisted of the following:
		December 28, 2013								December 29, 2012
		Cost		Accumulated		Impairment Loss		Net		Cost		Accumulated		Net
				Amortization								Amortization
		(In thousands)
	Completed technology	$	30,600	$	6,202	1,788		$	22,610	$	30,600	$	2,468	$	28,132
	Research contracts	100		100		—		—		100		100		—
	Tradename	800		742		—		58		800		708		92
	Total	$	31,500	$	7,044	$	1,788	$	22,668	$	31,500	$	3,276	$	28,224
	As part of the Company's decision during 2013 to refocus its funded research activities, the Company decided to no longer pursue certain research contracts in which completed technology acquired as part of the acquisition of Nekton Research, LLC was utilized. As a result, the Company performed an impairment assessment of the associated intangible asset using the income approach, and recorded an impairment loss of $1.8 million within general and administrative expenses during the fiscal year ended December 28, 2013.
	Amortization expense related to acquired intangible assets was $3.8 million, $1.2 million, and $0.9 million for the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011, 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)
	2014	$	3,522
	2015	3,482
	2016	3,457
	2017	3,457
	2018	3,457
	Total	$	17,375

Restructuring_Charges

Restructuring Charges	12 Months Ended
	Dec. 28, 2013
Restructuring and Related Activities [Abstract]	'
Restructuring Charges	'
	15	Restructuring charges
	In 2013, 2012 and 2011, the Company incurred restructuring charges of $3.3 million. $3.7 million, and $1.0 million, respectively. The restructuring charges incurred in 2013 primarily related to a $1.8 million write-down of an intangible asset, costs associated with the closing of its San Luis Obispo, California office and severance-related costs. The restructuring charges incurred in 2012 and 2011 primarily consisted of cost reductions in its defense and security business unit in 2012 and 2011, which resulted in workforce reductions and the write-off of certain inventory and fixed assets.
	The activity for the restructuring programs is presented below:
		Fiscal Year Ended
		28-Dec-13			29-Dec-12			December 31, 2011
		(In thousands)
	Balance at beginning of period	$	197		$	—		—
	Charges	3,296			3,679			1,015
	Utilization	(2,818		)	(3,482		)	(1,015		)
	Balance at end of period	$	675		$	197		$	—

Industry_Segment_Geographic_In

Industry Segment, Geographic Information and Significant Customers	12 Months Ended
	Dec. 28, 2013
Segment Reporting [Abstract]	'
Industry Segment, Geographic Information and Significant Customers	'
	16	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 Robots
	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 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:
		Fiscal Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
		(In thousands)
	Revenue:
	Home Robots	$	427,853		$	356,805		$	278,551
	Defense & Security Robots	50,003			70,948			175,119
	Other	9,545			8,491			11,830
	Total revenue	487,401			436,244			465,500
	Cost of revenue:
	Home Robots	217,011			174,756			151,299
	Defense & Security Robots	24,975			40,468			81,797
	Other	24,261			26,672			24,751
	Total cost of revenue	266,247			241,896			257,847
	Gross margin:
	Home Robots	210,842			182,049			127,252
	Defense & Security Robots	25,028			30,480			93,322
	Other	(14,716		)	(18,181		)	(12,921		)
	Total gross margin	221,154			194,348			207,653
	Research and development	63,649			57,066			60,100
	Selling and marketing	71,529			66,412			50,477
	General and administrative	53,358			45,698			43,753
	Other income (expense), net	(203		)	435			218
	Income before income taxes	$	32,415		$	25,607		$	53,541
	As of December 28, 2013, goodwill of $41.0 million and purchased intangible assets, net of $22.6 million recorded in conjunction with the acquisition of Evolution Robotics, Inc. in October 2012 are directly associated with the home robots business unit. Goodwill of $7.7 million and purchased intangible assets, net of $0.03 million recorded in conjunction with the acquisition of Nekton in September 2008 are directly associated with the defense and security business unit. Other long lived assets are not directly attributable to individual business segments.
	Geographic Information
	For the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011, sales to non-U.S. customers accounted for 59.5%, 57.3% and 45.5% of total revenue, respectively.
	Significant Customers
	For the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011, U.S. federal government orders, contracts and subcontracts accounted for 6.2%, 15.1% and 36.1% of total revenue, respectively. For the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011 approximately 75.3%, 75.4% and 74.0%, respectively, of our home robot product revenue resulted from sales to 15 customers. For the fiscal years ended December 28, 2013 and December 29, 2012, the Company generated an aggregate of 33.2% and 30.6%, respectively, of its total revenue from its home robots distributor in Japan (Sales on Demand Corporation) and a network of affiliated European distributors of the Company's home robots.

Quarterly_Information_Unaudite

Quarterly Information (Unaudited)	12 Months Ended
	Dec. 28, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Quarterly Information (Unaudited)	'
	17	Quarterly Information (Unaudited)
		Fiscal Quarter Ended
		March 31,		June 30,		September 29,		December 29,			March 30,		June 29,		September 28,		December 28,
		2012		2012		2012		2012			2013		2013		2013		2013
		(In thousands, except per share amounts)
	Revenue	$	97,807	$	111,445	$	126,298	$	100,694		$	106,195	$	130,362	$	124,501	$	126,343
	Gross margin	38,552		52,816		58,476		44,504			46,558		61,605		54,061		58,930
	Net income (loss)	653		7,375		15,207		(5,938		)	8,355		8,294		7,804		3,188
	Diluted earnings (loss) per share	$	0.02	$	0.26	$	0.54	$	(0.21	)	$	0.29	$	0.28	$	0.26	$	0.11

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 28, 2013

Accounting Policies [Abstract]

'

Basis of Presentation

'

Basis of Presentation

The accompanying consolidated financial statements include those of iRobot and its subsidiaries, after elimination of all intercompany accounts and transactions. In addition, certain prior year amounts have been reclassified to conform with the current year presentation. iRobot has prepared the accompanying consolidated financial statements in conformity with accounting principles generally accepted in the United States of America.

Reorganization [Policy Text Block]

'

Reorganization

In fiscal year 2012, the Company initiated a reorganization that resulted in, among other things, the centralization of all of the Company's engineering and operations activities. This reorganization was completed at the beginning of fiscal year 2013. In conjunction with this reorganization, the Company reviewed the financial statement classification of its costs and expenses. As a result of this review, the Company decided to classify certain expenses differently than had been classified and presented in prior periods to provide a more clear understanding of the Company's financial performance. As part of this review, the Company also evaluated the impact of the reorganization on its segment reporting and determined that certain modifications were necessary to present the segment information as now viewed by the Company's chief operating decision maker. Although the classification of certain expenses on the income statement has changed in fiscal year 2013 as compared to prior periods, the Company recast the financial results of prior periods in a manner consistent with the fiscal year 2013 presentation for comparability purposes. The reclassified amounts reflected in the consolidated statements of income for the years ended December 29, 2012 and December 31, 2011 included herein conform to the fiscal year 2013 presentation. This reclassification of costs and expenses did not impact previously reported net income or earnings per share as the changes only impacted the categorization of costs within the consolidated statements of income for the periods in question. Consequently, the classification changes did not impact previously presented consolidated balance sheets, statements of cash flow or statements of stockholders' equity.

Accounting Changes and Error Corrections [Text Block]

'

Revision of Consolidated Balance Sheet as of December 29, 2012

During the three month period ended March 30, 2013, the Company identified a classification error related to its reserves for uncertain tax positions on its December 29, 2012 consolidated balance sheet. The Company had recorded a gross income tax receivable in current assets and a gross uncertain tax positions liability against that receivable in current liabilities as of December 29, 2012. In addition, the Company misclassified certain liabilities for uncertain tax positions in current and long-term liabilities. The impact of the errors on the December 29, 2012 consolidated balance sheet was a decrease in Other Current Assets of $2.7 million, an increase in Other Assets of $0.2 million, a decrease in Accrued Expenses of $2.9 million, and an increase in Long-term Liabilities of $0.4 million. These adjustments were not considered to be material, individually or in the aggregate, to previously issued financial statements. The Company has revised its December 29, 2012 consolidated balance sheet to correct these errors as reflected herein. This revision had no impact on the consolidated statement of income, the consolidated statement of comprehensive income, or total cash flows from operating activities, investing activities, or financing activities.

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 will end on the Saturday that falls closest to the last day of the third month of each quarter.

Cash and Cash Equivalents

'

Cash and Cash Equivalents

The Company considers all highly liquid investments with an original or remaining maturity of three months or less at the time of purchase to be cash equivalents. The Company invests its excess cash primarily in money market funds or savings accounts of major financial institutions. Accordingly, its cash equivalents are subject to minimal credit and market risk. At December 28, 2013 and December 29, 2012, cash equivalents were comprised of money market funds totaling $101.4 million and $88.1 million, respectively. These cash equivalents are carried at cost, which approximates fair value.

Short Term Investments

'

Short Term Investments

The Company’s investments are classified as available-for-sale and are recorded at fair value with any unrealized gain or loss recorded as an element of stockholders’ equity. The fair value of investments is determined based on quoted market prices at the reporting date for those instruments. As of December 28, 2013 and December 29, 2012, investments consisted of:

December 28,

December 29,

2013

2012

Cost

Fair

Cost

Fair

Market Value

Market Value

(In thousands)

Corporate and government bonds

$

22,134

$

21,954

$

12,980

$

12,430

Total short term investments

$

22,134

$

21,954

$

12,980

$

12,430

As of December 28, 2013, the Company’s investments had maturity dates ranging from November 2014 to March 2017. The Company invests primarily in investment grade securities and limits the amount of investment in any single issuer.

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 provisional 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 December 28, 2013, 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.

Allowance for Doubtful Accounts

'

Allowance for Doubtful Accounts

The Company maintains an allowance for doubtful accounts to provide for the estimated amount of accounts receivable that may not be collected. The allowance is based upon an assessment of customer creditworthiness, historical payment experience and the age of outstanding receivables.

Activity related to the allowance for doubtful accounts was as follows:

Fiscal Year Ended

December 28,

December 29,

December 31,

2013

2012

2011

(In thousands)

Balance at beginning of period

$

111

$

87

$

88

Provision

—

37

—

Deduction(*)

(44

)

(13

)

(1

)

Balance at end of period

$

67

$

111

$

87

_____________________

(*)

Deductions related to allowance for doubtful accounts represent amounts written off against the allowance, less recoveries.

Inventory

'

Inventory

Inventory is stated at the lower of cost or net realizable value with cost being determined using the first-in, first-out (FIFO) method. The Company maintains a reserve for inventory items to provide for an estimated amount of excess or obsolete inventory.

Activity related to the inventory reserve was as follows:

Fiscal Year Ended

December 28,

December 29,

December 31,

2013

2012

2011

(In thousands)

Balance at beginning of period

$

6,608

$

2,568

$

2,836

Provision

1,571

5,101

411

Deduction(*)

(2,899

)

(1,061

)

(679

)

Balance at end of period

$

5,280

$

6,608

$

2,568

___________________________

(*)

Deductions related to inventory reserve accounts represent amounts written off against the reserve.

Property and Equipment

'

Property and Equipment

Property and equipment are recorded at cost and consist primarily of computer equipment, leasehold improvements, business applications software and machinery. Depreciation is computed using the straight-line method over the estimated useful lives as follows:

Estimated

Useful Life

Computer and research equipment

3 years

Furniture

5

Machinery

5-Feb

Tooling

5-Feb

Business applications software

7-May

Capital leases and leasehold improvements

Term of lease

Expenditures for additions, renewals and betterments of plant and equipment are capitalized. Expenditures for repairs and maintenance are charged to expense as incurred. As assets are retired or sold, the related cost and accumulated depreciation are removed from the accounts and any resulting gain or loss is credited or charged to operations.

Long-Lived Assets, including Purchased Intangible Assets

'

Long-Lived Assets, including Purchased Intangible Assets

The Company periodically evaluates the recoverability of long-lived assets, including other purchased intangible assets whenever events and changes in circumstances, such as reductions in demand or significant economic slowdowns in the industry, indicate that the carrying amount of an asset may not be fully recoverable. When indicators of impairment are present, the carrying values of the asset group are evaluated in relation to the future undiscounted cash flows of the underlying business. The net book value of the underlying asset is adjusted to fair value if the sum of the expected discounted cash flows is less than book value. Fair values are based on estimates of market prices and assumptions concerning the amount and timing of estimated future cash flows and assumed discount rates, reflecting varying degrees of perceived risk.

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 each year.

Research and Development

'

Research and Development

Costs incurred in the research and development of the Company’s products, classified as cost of contract and research and development, are expensed as incurred.

Internal Use Software

'

Internal Use Software

The Company capitalizes costs associated with the development and implementation of software for internal use. At December 28, 2013 and December 29, 2012, the Company had $8.2 million and $8.3 million, respectively, of costs related to enterprise-wide software included in fixed assets. Capitalized costs are being amortized over the assets’ estimated useful lives. The Company has recorded $0.9 million, $1.0 million and $0.9 million of amortization expense for the years ended December 28, 2013, December 29, 2012 and December 31, 2011, respectively.

Concentration of Credit Risk and Significant Customers

'

Concentration of Credit Risk and Significant Customers

Financial instruments which potentially expose the Company to concentrations of credit risk consist of accounts receivable. Management believes its credit policies are prudent and reflect normal industry terms and business risk. At December 28, 2013, two customers accounted for a total of 37% of the Company's accounts receivable balance, each of which was greater than 10% of the balance and each of whom secured their balance with guaranteed letters of credit. At December 29, 2012, three customers accounted for a total of 55% of the Company’s accounts receivable balance, each of which was greater than 10% of the balance. Two of the customers accounting for 36% of the Company’s accounts receivable balance secured their balance with guaranteed letters of credit. For the years ended December 28, 2013, December 29, 2012 and December 31, 2011, revenue from U.S. federal government orders, contracts and subcontracts, represented 6.2%, 15.1% and 36.1% of total revenue, respectively. For the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011, the Company generated an aggregate of 33.2%, 30.6% and 23.6%, respectively, of total revenue from its home robots distributor in Japan and a network of affiliated European distributors of its home robots.

The Company maintains its cash in bank deposit accounts at high quality financial institutions. The individual balances, at times, may exceed federally insured limits.

Geographic Information

For the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011, sales to non-U.S. customers accounted for 59.5%, 57.3% and 45.5% of total revenue, respectively.

Significant Customers

For the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011, U.S. federal government orders, contracts and subcontracts accounted for 6.2%, 15.1% and 36.1% of total revenue, respectively. For the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011 approximately 75.3%, 75.4% and 74.0%, respectively, of our home robot product revenue resulted from sales to 15 customers. For the fiscal years ended December 28, 2013 and December 29, 2012, the Company generated an aggregate of 33.2% and 30.6%, respectively, of its total revenue from its home robots distributor in Japan (Sales on Demand Corporation) and a network of affiliated European distributors of the Company's home robots.

Stock-Based Compensation

'

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 and restricted stock units is measured based on the closing fair market value of the Company’s common stock on the date of grant. The Company recognizes stock-based compensation cost as expense ratably on a straight-line basis over the requisite service period, net of estimated forfeitures.

Advertising Expense

'

Advertising Expense

The Company expenses advertising costs as they are incurred. During the years ended December 28, 2013, December 29, 2012 and December 31, 2011 advertising expense totaled $38.2 million, $34.9 million and $20.4 million, respectively.

Net Income Per Share

'

Net Income Per Share

The following table presents the calculation of both basic and diluted net income per share:

Fiscal Year Ended

December 28,

December 29,

December 31,

2013

2012

2011

Net income

$

27,641

$

17,297

$

40,191

Weighted-average shares outstanding

28,495

27,577

26,712

Dilutive effect of employee stock options and restricted shares

859

724

1,212

Diluted weighted average shares outstanding

29,354

28,301

27,924

Basic income per share

$

0.97

$

0.63

$

1.5

Diluted income per share

$

0.94

$

0.61

$

1.44

Potentially dilutive securities representing approximately 0.7 million, 0.8 million and 0.4 million shares of common stock for the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011, 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 years prior to 2010, the IRS has completed and closed its examination for all fiscal periods 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 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.

In fiscal 2012, as part of the Company's acquisition accounting for the acquisition of Evolution Robotics, Inc., the Company recorded a valuation allowance of $2.7 million related to certain state tax attributes of Evolution Robotics, Inc. In fiscal 2013, the deferred tax asset and related valuation allowance were reduced by $0.6 million based on the final computation of certain pre-acquisition state tax attributes of Evolution Robotics, Inc. At December 28, 2013, the Company maintains a net valuation allowance of $2.1 million.

Comprehensive Income

'

Comprehensive Income

Accumulated other comprehensive income includes unrealized gains and losses on certain investments. The differences between net income and comprehensive income were related to unrealized gains (losses) on investments, net of tax.

Fair Value Measurements

'

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 December 28, 2013, were as follows:

Fair Value Measurements as of

December 28, 2013

Description

Level 1

Level 2

Level 3

(In thousands)

Assets:

Money market funds

$

101,441

$

—

$

—

Corporate and government bonds

—

21,954

—

Total assets measured at fair value

$

101,441

$

21,954

$

—

The Company’s financial assets measured at fair value on a recurring basis at December 29, 2012, were as follows:

Fair Value Measurements as of

December 29, 2012

Description

Level 1

Level 2

Level 3

(In thousands)

Assets:

Money market funds

$

88,144

$

—

$

—

Corporate bonds

—

12,430

—

Total assets measured at fair value

$

88,144

$

12,430

$

—

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 and realized and unrealized gains and losses are included in comprehensive income for that period. The fair value of the Company’s bond investments are included in short term investments in its consolidated balance sheets.

Non-financial Assets

The Company's non-financial assets, which include goodwill, intangible assets, and property, plant and equipment are not required to be measured at fair value on a recurring basis. However, the Company evaluates the non-financial assets for impairment if a trigger event occurs, or when an annual impairment test is performed. If the asset is determined to be impaired, the asset is required to be recorded at fair value.

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.  We are currently assessing the impact, if any, on our consolidated financial statements.

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 the impact of recently issued standards, which are not yet effective, will not have a material impact on its consolidated financial statements upon adoption.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 28, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]	'
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	'
	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
		December 28, 2013
	Description	Level 1			Level 2			Level 3
		(In thousands)
	Assets:
	Money market funds	$	101,441		$	—		$	—
	Corporate and government bonds	—			21,954			—
	Total assets measured at fair value	$	101,441		$	21,954		$	—
	The Company’s financial assets measured at fair value on a recurring basis at December 29, 2012, were as follows:
		Fair Value Measurements as of
		December 29, 2012
	Description	Level 1			Level 2			Level 3
		(In thousands)
	Assets:
	Money market funds	$	88,144		$	—		$	—
	Corporate bonds	—			12,430			—
	Total assets measured at fair value	$	88,144		$	12,430		$	—
Components of available for sale securities	'
	The fair value of investments is determined based on quoted market prices at the reporting date for those instruments. As of December 28, 2013 and December 29, 2012, investments consisted of:
		December 28,						December 29,
		2013						2012
		Cost			Fair			Cost			Fair
					Market Value						Market Value
		(In thousands)
	Corporate and government bonds	$	22,134		$	21,954		$	12,980		$	12,430
	Total short term investments	$	22,134		$	21,954		$	12,980		$	12,430
Activity related to allowance for doubtful accounts	'
	Activity related to the allowance for doubtful accounts was as follows:
		Fiscal Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
		(In thousands)
	Balance at beginning of period	$	111		$	87		$	88
	Provision	—			37			—
	Deduction(*)	(44		)	(13		)	(1		)
	Balance at end of period	$	67		$	111		$	87
	_____________________
	(*)	Deductions related to allowance for doubtful accounts represent amounts written off against the allowance, less recoveries.
Activity related to Inventory reserve	'
	Activity related to the inventory reserve was as follows:
		Fiscal Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
		(In thousands)
	Balance at beginning of period	$	6,608		$	2,568		$	2,836
	Provision	1,571			5,101			411
	Deduction(*)	(2,899		)	(1,061		)	(679		)
	Balance at end of period	$	5,280		$	6,608		$	2,568
	___________________________
	(*)	Deductions related to inventory reserve accounts represent amounts written off against the reserve.
Property and equipment	'
	Depreciation is computed using the straight-line method over the estimated useful lives as follows:
		Estimated
		Useful Life
	Computer and research equipment	3 years
	Furniture	5
	Machinery	5-Feb
	Tooling	5-Feb
	Business applications software	7-May
	Capital leases and leasehold improvements	Term of lease
	Property and equipment consists of the following at:
		December 28,			December 29,
		2013			2012
		(In thousands)
	Computer and equipment	$	13,715		$	16,086
	Furniture	1,845			2,762
	Machinery	3,705			3,391
	Tooling	12,228			10,147
	Leasehold improvements	15,983			15,758
	Business applications software	8,162			8,273
		55,638			56,417
	Less: accumulated depreciation	31,977			31,464
		$	23,661		$	24,953
Basic and diluted net income per share	'
	The following table presents the calculation of both basic and diluted net income per share:
		Fiscal Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
	Net income	$	27,641		$	17,297		$	40,191
	Weighted-average shares outstanding	28,495			27,577			26,712
	Dilutive effect of employee stock options and restricted shares	859			724			1,212
	Diluted weighted average shares outstanding	29,354			28,301			27,924
	Basic income per share	$	0.97		$	0.63		$	1.5
	Diluted income per share	$	0.94		$	0.61		$	1.44

Inventory_Tables

Inventory (Tables)	12 Months Ended
	Dec. 28, 2013
Inventory Disclosure [Abstract]	'
Inventory	'
	Inventory consists of the following at:
		December 28,		December 29,
		2013		2012
		(In thousands)
	Raw materials	$	8,520	$	8,849
	Work in process	—		60
	Finished goods	37,587		28,056
		$	46,107	$	36,965

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 28, 2013
Property, Plant and Equipment [Abstract]	'
Property and equipment	'
	Depreciation is computed using the straight-line method over the estimated useful lives as follows:
		Estimated
		Useful Life
	Computer and research equipment	3 years
	Furniture	5
	Machinery	5-Feb
	Tooling	5-Feb
	Business applications software	7-May
	Capital leases and leasehold improvements	Term of lease
	Property and equipment consists of the following at:
		December 28,		December 29,
		2013		2012
		(In thousands)
	Computer and equipment	$	13,715	$	16,086
	Furniture	1,845		2,762
	Machinery	3,705		3,391
	Tooling	12,228		10,147
	Leasehold improvements	15,983		15,758
	Business applications software	8,162		8,273
		55,638		56,417
	Less: accumulated depreciation	31,977		31,464
		$	23,661	$	24,953

Other_Assets_Tables

Other Assets (Tables)	12 Months Ended
	Dec. 28, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]	'
Other Assets	'
	Other assets consists of the following at:
		December 28,		December 29,
		2013		2012
		(In thousands)
	Investment in Advanced Scientific Concepts, Inc.	$	2,500	$	2,500
	Investment in InTouch Technologies, Inc.	8,001		6,000
		$	10,501	$	8,500

Accrued_Expenses_Tables

Accrued Expenses (Tables)	12 Months Ended
	Dec. 28, 2013
Accrued Liabilities, Current [Abstract]	'
Components of accrued expenses	'
	Accrued expenses consist of the following at:
		December 28,		December 29,
		2013		2012
		(In thousands)
	Accrued warranty	$	6,497	$	6,057
	Accrued direct fulfillment costs	1,362		999
	Accrued sales tax	831		719
	Accrued rent	726		696
	Accrued sales commissions	539		475
	Accrued contractors	509		196
	Accrued other	4,416		4,500
		$	14,880	$	13,642
	Accrued compensation consists of the following at:
		December 28,		December 29,
		2013		2012
		(In thousands)
	Accrued bonus	$	13,002	$	5,186
	Accrued other compensation	6,604		6,678
		$	19,606	$	11,864

Stock_Options_Plans_and_StockB1

Stock Options Plans and Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Activities relating to restricted stock awards	'
	The table below summarizes activity relating to restricted stock units:
		Number of		Weighted Average
		Shares Underlying		Grant Date Fair
		Restricted Stock		Value
	Outstanding at January 1, 2011	570,077		$	15.14
	Granted	282,744		32.08
	Vested	(168,041	)	15.31
	Forfeited	(77,275	)	16.73
	Outstanding at December 31, 2011	607,505		$	22.77
	Granted	685,529		24.62
	Vested	(204,053	)	21.24
	Forfeited	(147,951	)	25.07
	Outstanding at December 29, 2012	941,030		$	24.09
	Granted	521,056		25.87
	Vested	(348,141	)	22.57
	Forfeited	(186,291	)	24.91
	Outstanding at December 28, 2013	927,654		$	25.5
Fair value of each option grant computed on the grant date	'
	The Company recognized $4.8 million of stock-based compensation expense during the fiscal year ended December 28, 2013 for stock options. The unamortized fair v
Summary of stock option plan activity	'
	The table below summarizes stock option plan activity:
		Number of		Weighted Average			Weighted  Average	Aggregate
		Shares		Exercise Price			Remaining	Intrinsic
							Contractual Term	Value(1)
	Outstanding at January 1, 2011	3,657,035		$	13.4
	Granted	349,650		33.27
	Exercised	(1,232,721	)	10.87
	Canceled	(212,672	)	15.37
	Outstanding at December 31, 2011	2,561,292		$	17.17
	Granted	547,948		19.7
	Exercised	(390,956	)	11.07
	Canceled	(214,617	)	21.91
	Outstanding at December 29, 2012	2,503,667		$	18.27
	Granted	293,325		24.6
	Exercised	(840,951	)	16.21
	Canceled	(185,666	)	22.16
	Outstanding at December 28, 2013	1,770,375		$	19.89		3.99 years	$27.5 million
	Vested and expected to vest at December 28, 2013	1,718,644		$	19.78		3.93 years	$26.9 million
	Exercisable as of December 28, 2013	1,069,247		$	18.04		2.90 years	$18.6 million
	Weighted average fair value of options granted during the fiscal year ended December 28, 2013			$	11.17
	Options available for future grant at December 28, 2013	4,003,676
	_________________________
	-1	The aggregate intrinsic value on the table was calculated based upon the positive difference between the closing market value of the Company’s stock on December 28, 2013 of $35.41 and the exercise price of the underlying option.
Summary of information about stock options outstanding	'
	The following table summarizes information about stock options outstanding at December 28, 2013:
			Options Outstanding						Options Exercisable
	Range of Exercise Prices		Number		Weighted Average	Weighted  Average			Number	Weighted Average
			Outstanding		Remaining	Exercise Price			Exercisable	Exercise Price
					Contractual Life
	$  2.33 - $ 7.76		207,041		4.11 years	$	5.65		157,154	$	6
	8.10 - 14.13		137,474		1.97	13.04			137,474	13.04
	14.52 - 14.52		246,122		3.13	14.52			200,541	14.52
	14.54 - 18.47		270,991		3.98	17.62			166,930	17.09
	18.61 - 22.20		100,970		2.24	20.62			89,246	20.72
	22.86 - 22.86		221,657		6.07	22.86			4,107	22.86
	24.00 - 25.99		244,975		3.82	24.86			146,955	24.5
	26.59 - 33.48		293,345		4.38	30.77			164,308	31.37
	33.72 - 34.67		43,300		6.57	33.98			—	—
	35.96 -  35.96		4,500		4.51	35.96			2,532	35.96
	$ 2.33 -  $35.96		1,770,375		3.99 years	$	19.89		1,069,247	$	18.04
Activities relating to restricted stock units	'
	The table below summarizes activity relating to restricted stock units:
		Number of		Weighted Average
		Shares Underlying		Grant Date Fair
		Restricted Stock		Value
	Outstanding at January 1, 2011	570,077		$	15.14
	Granted	282,744		32.08
	Vested	(168,041	)	15.31
	Forfeited	(77,275	)	16.73
	Outstanding at December 31, 2011	607,505		$	22.77
	Granted	685,529		24.62
	Vested	(204,053	)	21.24
	Forfeited	(147,951	)	25.07
	Outstanding at December 29, 2012	941,030		$	24.09
	Granted	521,056		25.87
	Vested	(348,141	)	22.57
	Forfeited	(186,291	)	24.91
	Outstanding at December 28, 2013	927,654		$	25.5
Restricted Stock [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Activities relating to restricted stock awards	'
	The table below summarizes activity relating to restricted stock awards:
		Number of		Weighted Average
		Shares Underlying		Grant Date Fair
		Restricted Stock		Value
	Outstanding at January 1, 2011	5,582		$	16.03
	Granted
	Vested	(5,582	)	16.03
	Forfeited
	Outstanding at December 31, 2011	—		$	—
	Granted
	Vested	—		—
	Forfeited
	Outstanding at December 29, 2012	—		$	—
	Granted
	Vested	—		—
	Forfeited
	Outstanding at December 28, 2013	—		$	—
Activities relating to restricted stock units	'
	The table below summarizes activity relating to restricted stock awards:
		Number of		Weighted Average
		Shares Underlying		Grant Date Fair
		Restricted Stock		Value
	Outstanding at January 1, 2011	5,582		$	16.03
	Granted
	Vested	(5,582	)	16.03
	Forfeited
	Outstanding at December 31, 2011	—		$	—
	Granted
	Vested	—		—
	Forfeited
	Outstanding at December 29, 2012	—		$	—
	Granted
	Vested	—		—
	Forfeited
	Outstanding at December 28, 2013	—		$	—

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 28, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]	'
Components of income tax expense	'
	The components of income tax expense were as follows:
		Fiscal Year Ended
		December 28,			December 29,				December 31,
		2013			2012				2011
		(In thousands)
	Current
	Federal	$	6,363		$	12,540			$	10,088
	State	1,124			473				1,600
	Foreign	41			(8		)		196
	Total current tax provision	7,528			13,005				11,884
	Deferred
	Federal	(2,026		)	(4,003		)		2,166
	State	(728		)	(692		)		(700		)
	Total deferred tax provision	(2,754		)	(4,695		)		1,466
	Total income tax provision	$	4,774		$	8,310			$	13,350
Components of net deferred tax assets	'
	The components of net deferred tax assets were as follows:
		December 28,			December 29,
		2013			2012
		(In thousands)
	Net deferred tax assets
	Current deferred tax assets
	Reserves and accruals	$	18,554		$	17,273
	Stock-based compensation	556			1,784
	Net operating loss carryforwards	2,470			2,470
	Foreign tax credits	105			133
	Valuation allowance	(1,100		)	(1,390		)
	Total current deferred tax assets	20,585			20,270
	Non-current deferred tax assets
	Reserves and accruals	715			182
	Tax credits	5,737			4,780
	Fixed assets	1,308			280
	Stock-based compensation	4,957			4,851
	Net operating loss carryforwards	6,587			9,664
	Valuation allowance	(990		)	(1,301		)
	Total non-current deferred tax assets	18,314			18,456
	Current deferred tax liabilities
	Prepaids	441			649
	Total current deferred tax liabilities	441			649
	Non-current deferred tax liabilities
	Intangible assets	8,219			10,019
	Total non-current deferred tax liabilities	8,219			10,019
	Total net deferred tax assets	$	30,239		$	28,058
Valuation allowance deferred tax assets	'
	Activity related to the inventory reserve was as follows:
		Fiscal Year Ended
		December 28,			December 29,				December 31,
		2013			2012				2011
		(In thousands)
	Balance at beginning of period	$	6,608		$	2,568			$	2,836
	Provision	1,571			5,101				411
	Deduction(*)	(2,899		)	(1,061		)		(679		)
	Balance at end of period	$	5,280		$	6,608			$	2,568
	___________________________
	(*)	Deductions related to inventory reserve accounts represent amounts written off against the reserve.
Reconciliation of the expected tax (benefit) expense	'
	The reconciliation of the expected tax (benefit) expense (computed by applying the federal statutory rate to income before income taxes) to actual tax expense was as follows:
		Fiscal Year Ended
		December 28,			December 29,				December 31,
		2013			2012				2011
		(In thousands)
	Expected federal income tax	$	11,345		$	8,962			$	18,739
	Miscellaneous permanent items	405			338				(13		)
	State taxes (net of federal benefit)	867			497				543
	Federal and state credits	(3,909		)	(418		)		(3,283		)
	Domestic production activities deduction	(1,168		)	(1,100		)		(2,695		)
	Other	(70		)	31				59
	Settlement of uncertain tax positions	(2,696		)	—				—
		$	4,774		$	8,310			$	13,350
Schedule of adjustments to uncertain tax position	'
	A summary of the Company’s adjustments to its gross unrecognized tax benefits, inclusive of interest, in the current year is as follows:
		Fiscal Year Ended
		December 28, 2013
	Balance at beginning of period	$	4,469
	Increase for tax positions related to the current year	355
	Increase for tax positions related to prior years	490
	Decreases for settlements with applicable taxing authorities	(2,696		)
	Decreases for lapses of statute of limitations	—
	Balance at end of period	$	2,618
Deferred Tax Asset [Domain]	'
Valuation and Qualifying Accounts Disclosure [Line Items]	'
Valuation allowance deferred tax assets	'
	The table below summarizes activity relating to the valuation allowance:
	Fiscal Year Ended	Balance at			Additions			Additions Charged to Goodwill			Deductions	Balance
		beginning  of			Charged to							at End
		period			Costs and							of Period
					Expenses
		(In thousands)
	December 31, 2011	$	—		—			—			—	$	—
	December 29, 2012	$	—		—			2,691			—	$	2,691
	December 28, 2013	$	2,691		—			—			601	$	2,090

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 28, 2013
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 December 28, 2013:
		Operating
		Leases
	2013	$	3,396
	2014	3,363
	2015	2,662
	2016	2,383
	2017	2,383
	Thereafter	3,177
	Total minimum lease payments	$	17,364
Activity related to the warranty accrual	'
	Activity related to the warranty accrual was as follows:
		Fiscal Year Ended
		December 28,			December 29,			December 31,
		2013			2012			2011
		(In thousands)
	Balance at beginning of period	$	6,057		$	10,306		$	9,284
	Provision (*)	1,744			(1,682		)	4,091
	Warranty usage(**)	(1,304		)	(2,567		)	(3,069		)
	Balance at end of period	$	6,497		$	6,057		$	10,306
	__________________________________
	(*)	During 2012, the Company recorded favorable adjustments relating to reductions in its international warranty accrual for our home robots business related to our sustained improvements in product quality, resulting in a net credit for its 2012 warranty provision.
	(**)	Warranty usage includes costs incurred for warranty obligations.

Acquisition_of_Evolution_Robot1

Acquisition of Evolution Robotics, Inc. Acquisition of Evolution Robotics, Inc. (Tables)	12 Months Ended
	Dec. 28, 2013
Business Combinations [Abstract]	'
Schedule of proforma consolidated results of operations	'
	The following unaudited pro forma consolidated results of operations for fiscal 2012 and fiscal 2011 assume that the acquisition of Evolution occurred as of January 2, 2011.
		Fiscal Year Ended
		December 29,		December 31,
		2012		2011
		(In thousands)
	Revenue	$	445,469	$	482,850
	Net Income	8,723		31,778

Goodwill_and_other_intangible_1

Goodwill and other intangible assets (Tables)	12 Months Ended
	Dec. 28, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Other intangible assets	'
		December 28, 2013								December 29, 2012
		Cost		Accumulated		Impairment Loss		Net		Cost		Accumulated		Net
				Amortization								Amortization
		(In thousands)
	Completed technology	$	30,600	$	6,202	1,788		$	22,610	$	30,600	$	2,468	$	28,132
	Research contracts	100		100		—		—		100		100		—
	Tradename	800		742		—		58		800		708		92
	Total	$	31,500	$	7,044	$	1,788	$	22,668	$	31,500	$	3,276	$	28,224
Estimated future amortization expense related to current intangible assets	'
		(In thousands)
	2014	$	3,522
	2015	3,482
	2016	3,457
	2017	3,457
	2018	3,457
	Total	$	17,375

Restructuring_Charges_Restruct

Restructuring Charges Restructuring Charges (Tables)	12 Months Ended
	Dec. 28, 2013
Restructuring and Related Activities [Abstract]	'
Restructuring reserve roll forward	'
	The activity for the restructuring programs is presented below:
		Fiscal Year Ended
		28-Dec-13			29-Dec-12			December 31, 2011
		(In thousands)
	Balance at beginning of period	$	197		$	—		—
	Charges	3,296			3,679			1,015
	Utilization	(2,818		)	(3,482		)	(1,015		)
	Balance at end of period	$	675		$	197		$	—

Industry_Segment_Geographic_In1

Industry Segment, Geographic Information and Significant Customers (Tables)	12 Months Ended
	Dec. 28, 2013
Segment Reporting [Abstract]	'
Concentration Risk Disclosure [Text Block]	'
	Concentration of Credit Risk and Significant Customers
	Financial instruments which potentially expose the Company to concentrations of credit risk consist of accounts receivable. Management believes its credit policies are prudent and reflect normal industry terms and business risk. At December 28, 2013, two customers accounted for a total of 37% of the Company's accounts receivable balance, each of which was greater than 10% of the balance and each of whom secured their balance with guaranteed letters of credit. At December 29, 2012, three customers accounted for a total of 55% of the Company’s accounts receivable balance, each of which was greater than 10% of the balance. Two of the customers accounting for 36% of the Company’s accounts receivable balance secured their balance with guaranteed letters of credit. For the years ended December 28, 2013, December 29, 2012 and December 31, 2011, revenue from U.S. federal government orders, contracts and subcontracts, represented 6.2%, 15.1% and 36.1% of total revenue, respectively. For the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011, the Company generated an aggregate of 33.2%, 30.6% and 23.6%, respectively, of total revenue from its home robots distributor in Japan and a network of affiliated European distributors of its home robots.
	The Company maintains its cash in bank deposit accounts at high quality financial institutions. The individual balances, at times, may exceed federally insured limits.
	Geographic Information
	For the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011, sales to non-U.S. customers accounted for 59.5%, 57.3% and 45.5% of total revenue, respectively.
	Significant Customers
	For the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011, U.S. federal government orders, contracts and subcontracts accounted for 6.2%, 15.1% and 36.1% of total revenue, respectively. For the fiscal years ended December 28, 2013, December 29, 2012 and December 31, 2011 approximately 75.3%, 75.4% and 74.0%, respectively, of our home robot product revenue resulted from sales to 15 customers. For the fiscal years ended December 28, 2013 and December 29, 2012, the Company generated an aggregate of 33.2% and 30.6%, respectively, of its total revenue from its home robots distributor in Japan (Sales on Demand Corporation) and a network of affiliated European distributors of the Company's home robots.
Segment information about revenue, cost of revenue, gross margin and income before income taxes	'
	The Company’s other revenue and cost of revenue result from other smaller business units that do not meet the criteria of a

Quarterly_Information_Unaudite1

Quarterly Information (Unaudited) (Tables)	12 Months Ended
	Dec. 28, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Details of Quarterly Information (Unaudited)	'
		Fiscal Quarter Ended
		March 31,		June 30,		September 29,		December 29,			March 30,		June 29,		September 28,		December 28,
		2012		2012		2012		2012			2013		2013		2013		2013
		(In thousands, except per share amounts)
	Revenue	$	97,807	$	111,445	$	126,298	$	100,694		$	106,195	$	130,362	$	124,501	$	126,343
	Gross margin	38,552		52,816		58,476		44,504			46,558		61,605		54,061		58,930
	Net income (loss)	653		7,375		15,207		(5,938		)	8,355		8,294		7,804		3,188
	Diluted earnings (loss) per share	$	0.02	$	0.26	$	0.54	$	(0.21	)	$	0.29	$	0.28	$	0.26	$	0.11

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Details) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Components of available for sale securities	'	'
Total short term investments, Cost	$22,134	$12,980
Total short term investments, Fair Market Value	21,954	12,430
Bonds [Member]	'	'
Components of available for sale securities	'	'
Total short term investments, Cost	22,134	12,980
Total short term investments, Fair Market Value	$21,954	$12,430

Summary_of_Significant_Account4

Summary of Significant Accounting Policies (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013		Dec. 29, 2012		Dec. 31, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]	'		'		'
Balance at beginning of period	$111		$87		$88
Provision	0		37		'
Deduction	-44	[1]	-13	[1]	-1	[1]
Balance at end of period	$67		$111		$87
[1]	Deductions related to allowance for doubtful accounts represent amounts written off against the allowance, less recoveries.

Summary_of_Significant_Account5

Summary of Significant Accounting Policies (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013		Dec. 29, 2012		Dec. 31, 2011
Inventory Valuation Allowance [Roll Forward]	'		'		'
Balance at beginning of period	$6,608		$2,568		$2,836
Valuation Allowances and Reserves, Charged to Cost and Expense	1,571		5,101		411
Valuation Allowances and Reserves, Deductions	2,899	[1]	1,061	[1]	679	[1]
Balance at end of period	$5,280		$6,608		$2,568
[1]	Deductions related to inventory reserve accounts represent amounts written off against the reserve.

Summary_of_Significant_Account6

Summary of Significant Accounting Policies (Details 3)	12 Months Ended
	Dec. 28, 2013
Computer and research equipment [Member]	'
Property Plant And Equipment [Line Items]	'
Estimated useful life	'3 years
Furniture [Member]	'
Property Plant And Equipment [Line Items]	'
Estimated useful life	'5 years
Capital leases and leasehold improvements [Member]	'
Property Plant And Equipment [Line Items]	'
Capital leases and leasehold improvements	'Term of lease
Minimum [Member] | Machinery [Member]	'
Property Plant And Equipment [Line Items]	'
Estimated useful life	'2 years
Minimum [Member] | Tooling [Member]	'
Property Plant And Equipment [Line Items]	'
Estimated useful life	'2 years
Minimum [Member] | Software and Software Development Costs [Member]	'
Property Plant And Equipment [Line Items]	'
Estimated useful life	'5 years
Maximum [Member] | Machinery [Member]	'
Property Plant And Equipment [Line Items]	'
Estimated useful life	'5 years
Maximum [Member] | Tooling [Member]	'
Property Plant And Equipment [Line Items]	'
Estimated useful life	'5 years
Maximum [Member] | Software and Software Development Costs [Member]	'
Property Plant And Equipment [Line Items]	'
Estimated useful life	'7 years

Summary_of_Significant_Account7

Summary of Significant Accounting Policies (Details 4) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Basic and Diluted Net Income Per Share	'	'	'	'	'	'	'	'	'	'	'
Net income, as reported	$3,188	$7,804	$8,294	$8,355	$15,207	$7,375	$653	($5,938)	$27,641	$17,297	$40,191
Weighted-average shares outstanding	'	'	'	'	'	'	'	'	28,495	27,577	26,712
Dilutive effect of employee stock options and restricted shares	'	'	'	'	'	'	'	'	859	724	1,212
Diluted weighted average shares outstanding	'	'	'	'	'	'	'	'	29,354	28,301	27,924
Basic income per share	'	'	'	'	'	'	'	'	$0.97	$0.63	$1.50
Diluted earnings (loss) per share	$0.11	$0.26	$0.28	$0.29	$0.54	$0.26	$0.02	($0.21)	$0.94	$0.61	$1.44

Summary_of_Significant_Account8

Summary of Significant Accounting Policies (Details 5) (Fair Value, Measurements, Recurring [Member], USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Level 1 [Member]	'	'
Asset	'	'
Total assets measured at fair value	$101,441	$88,144
Level 1 [Member] | Money Market Funds [Member]	'	'
Asset	'	'
Total assets measured at fair value	101,441	88,144
Level 1 [Member] | Bonds [Member]	'	'
Asset	'	'
Total assets measured at fair value	'	'
Level 1 [Member] | Bonds [Member]	'	'
Asset	'	'
Total assets measured at fair value	'	'
Level 2 [Member]	'	'
Asset	'	'
Total assets measured at fair value	21,954	12,430
Level 2 [Member] | Money Market Funds [Member]	'	'
Asset	'	'
Total assets measured at fair value	'	'
Level 2 [Member] | Bonds [Member]	'	'
Asset	'	'
Total assets measured at fair value	'	12,430
Level 2 [Member] | Bonds [Member]	'	'
Asset	'	'
Total assets measured at fair value	21,954	'
Level 3 [Member]	'	'
Asset	'	'
Total assets measured at fair value	'	'
Level 3 [Member] | Money Market Funds [Member]	'	'
Asset	'	'
Total assets measured at fair value	'	'
Level 3 [Member] | Bonds [Member]	'	'
Asset	'	'
Total assets measured at fair value	'	'
Level 3 [Member] | Bonds [Member]	'	'
Asset	'	'
Total assets measured at fair value	'	'

Summary_of_Significant_Account9

Summary of Significant Accounting Policies (Details Textual) (USD $)	12 Months Ended
Share data in Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
	customer	customer
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Capitalized Computer Software, Gross	$8,200,000	$8,300,000	'	'
Cash Equivalents, at Carrying Value	101,400,000	88,100,000	'	'
Summary of Significant Accounting Policies (Additional Textual) [Abstract]	'	'	'	'
Valuation Allowance, Deferred Tax Asset, Change in Amount	600,000	'	'	'
Number of customers with accounts receivable balance greater than 10% of total receivables	2	3	'	'
Percentage of receivables held by three customers	37.00%	'	'	'
Percentage of receivables held by four customers	'	55.00%	'	'
Minimum percentage help by each customer with an accounts receivable balance greater than 10% of the total accounts receivable balance	10.00%	10.00%	'	'
Number of customers with accounts receivable balance greater than 10% of total receivables secured by guaranteed letters of credit	'	2	'	'
Percentage of receivables secured by guaranteed letter of credit for customers with accounts receivable balance greater than 10% of the total accounts receivable balance	'	36.00%	'	'
Advertising cost	38,200,000	34,900,000	20,400,000	'
Potentially diluted shares of common stock	0.7	0.8	0.4	'
Valuation allowance related to acquired entity	'	2,700,000	'	'
Deferred Tax Assets, Valuation Allowance	$2,090,000	$2,691,000	'	$0
Government Contracts Concentration Risk [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Concentration Risk, Percentage	6.20%	15.10%	36.10%	'
Customer Concentration Risk [Member] | Government Contracts Concentration Risk [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Concentration Risk, Percentage	6.20%	15.10%	36.10%	'
Customer Concentration Risk [Member] | International distributors of home robots products [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Concentration Risk, Percentage	33.20%	30.60%	23.60%	'

Recovered_Sheet1

Summary of Significant Accounting Policies (Details Texutal - Property Plant And Equipment) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Property Plant And Equipment [Line Items]	'	'	'
Capitalized Computer Software, Gross	$8.20	$8.30	'
Maximum [Member]	'	'	'
Property Plant And Equipment [Line Items]	'	'	'
Operating and Reporting Period	'371 days	'	'
Minimum [Member]	'	'	'
Property Plant And Equipment [Line Items]	'	'	'
Operating and Reporting Period	'364 days	'	'
Software and Software Development Costs [Member]	'	'	'
Property Plant And Equipment [Line Items]	'	'	'
Amortization Expense	$0.90	$1	$0.90

Recovered_Sheet2

Summary of Significant Accounting Policies Revision (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Sep. 28, 2013
Other Liabilities [Member]	'
Quantifying Misstatement in Current Year Financial Statements, Amount	$0.40
Other Current Assets [Member]	'
Quantifying Misstatement in Current Year Financial Statements, Amount	2.7
Other Assets [Member]	'
Quantifying Misstatement in Current Year Financial Statements, Amount	0.2
Accrued Liabilities [Member]	'
Quantifying Misstatement in Current Year Financial Statements, Amount	$2.90

Inventory_Details

Inventory (Details) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Inventory, Raw Materials, Net of Reserves	$8,520	$8,849
Inventory	'	'
Work in process	0	60
Finished goods	37,587	28,056
Total	$46,107	$36,965

Property_and_Equipment_Details

Property and Equipment (Details) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Property and Equipment	'	'	'
Property, Plant and Equipment, Gross	$55,638,000	$56,417,000	'
Less: accumulated depreciation	31,977,000	31,464,000	'
Property, Plant and Equipment, Net, Total	23,661,000	24,953,000	'
Depreciation And Amortization [Abstract]	'	'	'
Depreciation	8,100,000	9,900,000	9,000,000
Computer and equipment [Member]	'	'	'
Property and Equipment	'	'	'
Property, Plant and Equipment, Gross	13,715,000	16,086,000	'
Furniture [Member]	'	'	'
Property and Equipment	'	'	'
Property, Plant and Equipment, Gross	1,845,000	2,762,000	'
Machinery [Member]	'	'	'
Property and Equipment	'	'	'
Property, Plant and Equipment, Gross	3,705,000	3,391,000	'
Tooling [Member]	'	'	'
Property and Equipment	'	'	'
Property, Plant and Equipment, Gross	12,228,000	10,147,000	'
Leasehold improvements [Member]	'	'	'
Property and Equipment	'	'	'
Property, Plant and Equipment, Gross	15,983,000	15,758,000	'
Software and Software Development Costs [Member]	'	'	'
Property and Equipment	'	'	'
Property, Plant and Equipment, Gross	$8,162,000	$8,273,000	'

Other_Assets_Details

Other Assets (Details) (USD $)	3 Months Ended
	Mar. 30, 2013	Dec. 28, 2013	Dec. 29, 2012
Schedule of Cost-method Investments [Line Items]	'	'	'
Investment	'	$10,501,000	$8,500
Cost Method Investments, Additional Purchased	2,000,000	'	'
Preferred Stock [Member] | Advanced Scientific Concepts, Inc. [Member]	'	'	'
Schedule of Cost-method Investments [Line Items]	'	'	'
Investment	'	2,500,000	'
Preferred Stock [Member] | InTouch Technologies, Inc. [Member]	'	'	'
Schedule of Cost-method Investments [Line Items]	'	'	'
Investment	'	$8,001,000	$6,000,000

Accrued_Expenses_Details

Accrued Expenses (Details) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Accrued Liabilities, Current [Abstract]	'	'
Accrued Bonuses	$13,002	$5,186
Components of accrued expenses	'	'
Accrued warranty	6,497	6,057
Accrued direct fulfillment costs	1,362	999
Accrued Sales Tax	831	719
Accrued rent	726	696
Accrued sales commissions	539	475
Accrued contractors, current	509	196
Accrued other	4,416	4,500
Accrued expenses, total	14,880	13,642
Accrued Employee Benefits, Current	6,604	6,678
Employee-related Liabilities, Current	$19,606	$11,864

Revolving_Line_of_Credit_Detai

Revolving Line of Credit (Details) (USD $)	12 Months Ended
	Dec. 28, 2013
Revolving Line of Credit (Textual) [Abstract]	'
Maximum amount available for borrowing under credit facility	$75,000,000
Interest on loans under the credit facility	'at either (1) LIBOR plus a margin, currently equal to 1.0%, based on the Company's ratio of indebtedness to Adjusted EBITDA (the "Eurodollar Rate"), or (2) the lender's base rate.
Interest rate above the LIBOR Daily Floating Rate or the Prime Rate of Lender under condition one	1.00%
Interest Rate Above the Federal Fund Rate Under Condition Two	0.50%
Interest rate above the LIBOR rate plus under condition two	1.00%
Termination date for all outstanding amount and credit facility	20-Dec-18
Line of Credit Facility, Amount Outstanding	$0

Stock_Options_Plans_and_StockB2

Stock Options Plans and Stock-Based Compensation (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Fair value of each option grant computed on the grant date	'	'	'
Risk-free interest rate, minimum	0.90%	0.63%	0.83%
Risk-free interest rate, maximum	1.80%	0.90%	2.24%
Expected volatility, minimum	54.00%	63.00%	61.00%
Expected volatility, maximum	58.00%	64.00%	63.00%
Minimum [Member]	'	'	'
Fair value of each option grant computed on the grant date	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	'	'	'
Expected life	'4 years 0 months 10 days	'4 years 1 month 13 days	'4 years 1 month 10 days
Maximum [Member]	'	'	'
Fair value of each option grant computed on the grant date	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	'	'	'
Expected life	'4 years 2 months 16 days	'4 years 2 months 5 days	'4 years 3 months 22 days
Employee Stock Option [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Stock Based Compensation Expense Expects to Recognize in Year One	3.5	'	'
Stock Based Compensation Expense Expects to Recognize in Year Two	2.1	'	'
Stock Based Compensation Expense Expects to Recognize in Year Three	1.4	'	'
Stock Based Compensation Expense Expects to Recognize in Year Four	0.2	'	'

Stock_Options_Plans_and_StockB3

Stock Options Plans and Stock-Based Compensation (Details 1) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 28, 2013		Dec. 29, 2012	Dec. 31, 2011
Summary of stock option plan activity	'		'	'
Number of Shares, Beginning Balance	2,503,667		2,561,292	3,657,035
Weighted Average Exercise Price, Beginning Balance	$18.27		$17.17	$13.40
Number of Shares, Granted	293,325		547,948	349,650
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$24.60		$19.70	$33.27
Number of Shares, Exercised	-840,951		-390,956	-1,232,721
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$16.21		$11.07	$10.87
Number of Shares, Canceled	-185,666		-214,617	-212,672
Number of Shares, Ending Balance	1,770,375		2,503,667	2,561,292
Weighted Average Exercise Price, Ending Balance	$19.89		$18.27	$17.17
Weighted Average Remaining Contractual Term, Ending Balance	'3 years 11 months 28 days		'	'
Aggregate Intrinsic Value, Ending Balance	$27.50	[1]	'	'
Number of Shares, Vested and expected to vest	1,718,644		'	'
Weighted Average Exercise Price, Vested and expected to vest	$19.78		'	'
Weighted Average Remaining Contractual Term, Vested and expected to vest	'3 years 11 months 5 days		'	'
Aggregate Intrinsic Value, Vested and expected to vest	26.9	[1]	'	'
Number of Shares, Exercisable	1,069,247		'	'
Weighted Average Exercise Price, Exercisable	$18.04		'	'
Weighted Average Remaining Contractual Term, Exercisable	'2 years 10 months 24 days		'	'
Aggregate Intrinsic Value, Exercisable	$18.60	[1]	'	'
Share based compensation arrangement shares available for grant	4,003,676		'	'
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$22.16		$21.91	$15.37
[1]	The aggregate intrinsic value on the table was calculated based upon the positive difference between the closing market value of the Company’s stock on December 28, 2013 of $35.41 and the exercise price of the underlying option.

Stock_Options_Plans_and_StockB4

Stock Options Plans and Stock-Based Compensation (Details 2) (USD $)	0 Months Ended	12 Months Ended
	Oct. 02, 2012	Dec. 28, 2013
Summary of information about stock options outstanding	'	'
Range of Exercise Price, Minimum	$2.55	$2.33
Range of Exercise Price, Maximum	$4.81	$35.96
Number Outstanding	'	1,770,375
Options Outstanding Weighted Average Remaining Contractual Life	'	'3 years 11 months 27 days
Weighted Average Exercise Price	'	$19.89
Number Exercisable	'	1,069,247
Weighted Average Exercise Price	'	$18.04
Range of Exercise Prices One [Member]	'	'
Summary of information about stock options outstanding	'	'
Range of Exercise Price, Minimum	'	$2.33
Range of Exercise Price, Maximum	'	$7.76
Number Outstanding	'	207,041
Options Outstanding Weighted Average Remaining Contractual Life	'	'4 years 1 month 10 days
Weighted Average Exercise Price	'	$5.65
Number Exercisable	'	157,154
Weighted Average Exercise Price	'	$6
Range of Exercise Prices Two [Member]	'	'
Summary of information about stock options outstanding	'	'
Range of Exercise Price, Minimum	'	$8.10
Range of Exercise Price, Maximum	'	$14.13
Number Outstanding	'	137,474
Options Outstanding Weighted Average Remaining Contractual Life	'	'1 year 11 months 18 days
Weighted Average Exercise Price	'	$13.04
Number Exercisable	'	137,474
Weighted Average Exercise Price	'	$13.04
Range of Exercise Prices Three [Member]	'	'
Summary of information about stock options outstanding	'	'
Range of Exercise Price, Minimum	'	$14.52
Range of Exercise Price, Maximum	'	$14.52
Number Outstanding	'	246,122
Options Outstanding Weighted Average Remaining Contractual Life	'	'3 years 1 month 17 days
Weighted Average Exercise Price	'	$14.52
Number Exercisable	'	200,541
Weighted Average Exercise Price	'	$14.52
Range of Exercise Prices Four [Member]	'	'
Summary of information about stock options outstanding	'	'
Range of Exercise Price, Minimum	'	$14.54
Range of Exercise Price, Maximum	'	$18.47
Number Outstanding	'	270,991
Options Outstanding Weighted Average Remaining Contractual Life	'	'3 years 11 months 24 days
Weighted Average Exercise Price	'	$17.62
Number Exercisable	'	166,930
Weighted Average Exercise Price	'	$17.09
Range of Exercise Prices Five [Member]	'	'
Summary of information about stock options outstanding	'	'
Range of Exercise Price, Minimum	'	$18.61
Range of Exercise Price, Maximum	'	$22.20
Number Outstanding	'	100,970
Options Outstanding Weighted Average Remaining Contractual Life	'	'2 years 2 months 28 days
Weighted Average Exercise Price	'	$20.62
Number Exercisable	'	89,246
Weighted Average Exercise Price	'	$20.72
Range of Exercise Prices Six [Member]	'	'
Summary of information about stock options outstanding	'	'
Range of Exercise Price, Minimum	'	$22.86
Range of Exercise Price, Maximum	'	$22.86
Number Outstanding	'	221,657
Options Outstanding Weighted Average Remaining Contractual Life	'	'6 years 0 months 26 days
Weighted Average Exercise Price	'	$22.86
Number Exercisable	'	4,107
Weighted Average Exercise Price	'	$22.86
Range of Exercise Prices Seven [Member]	'	'
Summary of information about stock options outstanding	'	'
Range of Exercise Price, Minimum	'	$24
Range of Exercise Price, Maximum	'	$25.99
Number Outstanding	'	244,975
Options Outstanding Weighted Average Remaining Contractual Life	'	'3 years 9 months 26 days
Weighted Average Exercise Price	'	$24.86
Number Exercisable	'	146,955
Weighted Average Exercise Price	'	$24.50
Range of Exercise Prices Eight [Member]	'	'
Summary of information about stock options outstanding	'	'
Range of Exercise Price, Minimum	'	$26.59
Range of Exercise Price, Maximum	'	$33.48
Number Outstanding	'	293,345
Options Outstanding Weighted Average Remaining Contractual Life	'	'4 years 4 months 17 days
Weighted Average Exercise Price	'	$30.77
Number Exercisable	'	164,308
Weighted Average Exercise Price	'	$31.37
Range of Exercise Prices Nine [Member]	'	'
Summary of information about stock options outstanding	'	'
Range of Exercise Price, Minimum	'	$33.72
Range of Exercise Price, Maximum	'	$34.67
Number Outstanding	'	43,300
Options Outstanding Weighted Average Remaining Contractual Life	'	'6 years 6 months 26 days
Weighted Average Exercise Price	'	$33.98
Number Exercisable	'	0
Weighted Average Exercise Price	'	$0
Range of Exercise Prices Ten [Member]	'	'
Summary of information about stock options outstanding	'	'
Range of Exercise Price, Minimum	'	$35.96
Range of Exercise Price, Maximum	'	$35.96
Number Outstanding	'	4,500
Options Outstanding Weighted Average Remaining Contractual Life	'	'4 years 6 months 3 days
Weighted Average Exercise Price	'	$35.96
Number Exercisable	'	2,532
Weighted Average Exercise Price	'	$35.96

Stock_Options_Plans_and_StockB5

Stock Options Plans and Stock-Based Compensation (Details 3) (Restricted Stock [Member], USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Restricted Stock [Member]	'	'	'
Activities relating to restricted stock awards	'	'	'
Number of Shares Underlying Restricted Stock, Beginning Balance	'	'	5,582
Weighted Average Grant Date Fair Value, Beginning Balance	'	$0	$16.03
Number of Shares Underlying Restricted Stock, Granted	'	'	'
Weighted Average Grant Date Fair Value, Granted	'	'	'
Number of Shares Underlying Restricted Stock, Vested	'	0	-5,582
Weighted Average Grant Date Fair Value, Vested	'	$0	$16.03
Number of Shares Underlying Restricted Stock, Forfeited	'	'	'
Number of Shares Underlying Restricted Stock, Ending Balance	'	'	'
Weighted Average Grant Date Fair Value, Ending Balance	'	'	$0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	'	'	'

Stock_Options_Plans_and_Stock_

Stock Options Plans and Stock Based Compensation (Details 4) (Restricted Stock Units [Member], USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Restricted Stock Units [Member]	'	'	'
Activities relating to restricted stock units	'	'	'
Number of Shares Underlying Restricted Stock, Beginning Balance	941,030	607,505	570,077
Weighted Average Grant Date Fair Value, Beginning Balance	$24.09	$22.77	$15.14
Number of Shares Underlying Restricted Stock, Granted	521,056	685,529	282,744
Weighted Average Grant Date Fair Value, Granted	$25.87	$24.62	$32.08
Number of Shares Underlying Restricted Stock, Vested	-348,141	-204,053	-168,041
Weighted Average Grant Date Fair Value, Vested	$22.57	$21.24	$15.31
Number of Shares Underlying Restricted Stock, Forfeited	-186,291	-147,951	-77,275
Number of Shares Underlying Restricted Stock, Ending Balance	927,654	941,030	607,505
Weighted Average Grant Date Fair Value, Ending Balance	$25.50	$24.09	$22.77
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$24.91	$25.07	$16.73

Stock_Options_Plans_and_Stock_1

Stock Options Plans and Stock Based Compensation (Details Textual) (USD $)	0 Months Ended		12 Months Ended
In Millions, except Share data, unless otherwise specified	Oct. 02, 2012	Oct. 10, 2005	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
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%	'
Share based compensation arrangement shares available for grant	'	'	4,003,676	'	'
Unamortized fair value stock options granted	'	'	$7.20	'	'
Weighted average fair value of each stock option granted	'	'	$11.17	$13.23	$16.55
Closing market value of stock	'	'	$35.41	'	'
Total intrinsic value of stock options exercised	'	'	12.1	6.2	25.4
Weighted average exercise price, exercisable	'	'	$18.04	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$2.55	'	$2.33	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$4.81	'	$35.96	'	'
Restricted Stock Units [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Stock based compensation expense for stock options and restricted stock units granted subsequent to initial S-1 filing	'	'	8.6	'	'
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	'	'	17.5	17.9	11.7
Stock-based compensation expense Expects to recognize in year one related to restricted stock units	'	'	7.6	'	'
Stock-based compensation expense Expects to recognize in year two related to restricted stock units	'	'	5.3	'	'
Stock-based compensation expense Expects to recognize in year three related to restricted stock units	'	'	3.6	'	'
Stock-based compensation expense Expects to recognize in year four related to restricted stock units	'	'	1	'	'
Employee Stock Option [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Stock based compensation expense for stock options and restricted stock units granted subsequent to initial S-1 filing	'	'	4.8	'	'
Weighted average remaining recognition period	'	'	'2 years 5 months 10 days	'	'
Stock-based compensation expense Expects to recognize in year one related to restricted stock units	'	'	3.5	'	'
Stock-based compensation expense Expects to recognize in year two related to restricted stock units	'	'	2.1	'	'
Stock-based compensation expense Expects to recognize in year three related to restricted stock units	'	'	1.4	'	'
Stock-based compensation expense Expects to recognize in year four related to restricted stock units	'	'	0.2	'	'
Employee Stock Option [Member] | Maximum [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Vesting period for options	'	'	'5 years	'	'
Minimum expiration period for options	'	'	'10 years	'	'
Employee Stock Option [Member] | Minimum [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Vesting period for options	'	'	'0 years	'	'
Minimum expiration period for options	'	'	'7 years	'	'
Restricted Stock [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Stock based compensation expense for stock options and restricted stock units granted subsequent to initial S-1 filing	'	'	0	'	'
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	'	'	$0	'	'
Two Thousand Five Plan [Member]	'	'	'	'	'
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	'	'	4,003,676	'	'
Employee Termination [Member] | Employee Stock Option [Member] | Maximum [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Minimum expiration period for options	'	'	'90 days	'	'
Employee Termination [Member] | Employee Stock Option [Member] | Minimum [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Minimum expiration period for options	'	'	'60 days	'	'
Evolution Robotics, Inc. (ER) [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	114,248	'	'	'	'

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Current	'	'	'
Federal	$6,363	$12,540	$10,088
State	1,124	473	1,600
Foreign	41	-8	196
Total current tax provision	7,528	13,005	11,884
Deferred	'	'	'
Federal	-2,026	-4,003	2,166
State	-728	-692	-700
Deferred Income Tax Expense (Benefit)	-2,754	-4,695	1,466
Total income tax provision	$4,774	$8,310	$13,350

Income_Taxes_Details_1

Income Taxes (Details 1) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Current deferred tax assets	'	'
Deferred Tax Assets, Reserves and Accruals, current	$18,554	$17,273
Stock-based compensation	556	1,784
Net operating loss carryforwards	2,470	2,470
Foreign tax credits	105	133
Valuation allowance	-1,100	-1,390
Total current deferred tax assets	20,585	20,270
Non-current deferred tax assets	'	'
Reserves and accruals	715	182
Tax credits	5,737	4,780
Fixed assets	1,308	280
Stock-based compensation	4,957	4,851
Net operating loss carryforwards	6,587	9,664
Valuation allowance	-990	-1,301
Total non-current deferred tax assets	18,314	18,456
Current deferred tax liabilities	'	'
Deferred Tax Liabilities, Prepaid Expenses	441	649
Total current deferred tax liabilities	441	649
Non-current deferred tax liabilities	'	'
Intangible assets	8,219	10,019
Total non-current deferred tax liabilities	8,219	10,019
Total net deferred tax assets	$30,239	$28,058

Income_Taxes_Details_2

Income Taxes (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013		Dec. 29, 2012		Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Balance at beginning of period	$2,691		'		$0
Valuation Allowances and Reserves, Charged to Cost and Expense	1,571		5,101		411
Valuation Allowances and Reserves, Deductions	2,899	[1]	1,061	[1]	679	[1]
Balance at End of Period	2,090		2,691		'
Deferred Tax Asset [Domain]	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Valuation Allowances and Reserves, Charged to Cost and Expense	'		'		'
Valuation Allowances and Reserves, Charged to Other Accounts	0		2,691		'
Valuation Allowances and Reserves, Deductions	$601		'		$0
[1]	Deductions related to inventory reserve accounts represent amounts written off against the reserve.

Income_Taxes_Details_3

Income Taxes (Details 3) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Reconciliation of the expected tax (benefit) expense	'	'	'
Expected federal income tax	$11,345	$8,962	$18,739
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	405	338	-13
State taxes (net of federal benefit)	867	497	543
Federal and state credits	-3,909	-418	-3,283
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount	-1,168	-1,100	-2,695
Other	-70	31	59
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount	-2,696	0	0
Total expected tax (benefits) expenses	$4,774	$8,310	$13,350

Income_Taxes_Details_4

Income Taxes (Details 4) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013
Company's adjustments to its uncertain tax position	'
Balance at beginning of period	$4,469
Increase for tax positions related to the current year	355
Increase for tax positions related to prior years	490
Decreases for settlements with applicable taxing authorities	-2,696
Decreases for lapses of statute of limitations	'
Balance at end of period	$2,618

Income_Taxes_Details_Textual

Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Income Taxes (Textual) [Abstract]	'	'	'	'
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	'	$0	$0	'
Deferred tax liability not established for undistributed earnings of non-US subsidiaries	400,000	'	'	'
Valuation allowance related to acquired entity	'	2,700,000	'	'
Net deferred tax assets	30,239,000	28,058,000	'	'
Operating Loss Carryforwards	45,000,000	62,900,000	'	'
Decrease in unrecognised tax benefits due to settlement of federal tax audit	700,000	'	'	'
Unrecognized Tax Benefit to the income tax provision if it become recognizable	1,900,000	'	'	'
Valuation Allowance, Deferred Tax Asset, Change in Amount	600,000	'	'	'
Unrecognized Tax Benefits	500,000	500,000	'	'
Deferred Tax Assets, Valuation Allowance	2,090,000	2,691,000	'	0
Evolution Robotics, Inc. (ER) [Member]	'	'	'	'
Income Taxes (Textual) [Abstract]	'	'	'	'
Operating Loss Carryforwards	45,000,000	'	'	'
Research Tax Credit Carryforward [Member]	'	'	'	'
Income Taxes (Textual) [Abstract]	'	'	'	'
Tax Credit Carryforward, Amount	8,900,000	7,400,000	'	'
Research Tax Credit Carryforward [Member] | Evolution Robotics, Inc. (ER) [Member]	'	'	'	'
Income Taxes (Textual) [Abstract]	'	'	'	'
Tax Credit Carryforward, Amount	2,200,000	'	'	'
Investment Tax Credit Carryforward [Member]	'	'	'	'
Income Taxes (Textual) [Abstract]	'	'	'	'
Tax Credit Carryforward, Amount	$600,000	$600,000	'	'

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	Dec. 28, 2013
In Thousands, unless otherwise specified
Summary of future minimum rental payments under operating leases	'
2013	$3,396
2014	3,363
2015	2,662
2016	2,383
2017	2,383
Thereafter	3,177
Total minimum lease payments	$17,364

Commitments_and_Contingencies_2

Commitments and Contingencies (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013		Dec. 29, 2012		Dec. 31, 2011
Activity related to the warranty accrual	'		'		'
Balance at beginning of period	$6,057		$10,306		$9,284
Provision	-1,744	[1]	-1,682	[1]	-4,091	[1]
Warranty usage	-1,304	[2]	-2,567	[2]	-3,069	[2]
Balance at end of period	$6,497		$6,057		$10,306
[1]	During 2012, the Company recorded favorable adjustments relating to reductions in its international warranty accrual for our home robots business related to our sustained improvements in product quality, resulting in a net credit for its 2012 warranty provision.
[2]	Warranty usage includes costs incurred for warranty obligations.

Commitments_and_Contingencies_3

Commitments and Contingencies (Details Textual) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Commitments and Contingencies (Textual) [Abstract]	'	'	'
Rental expense under operating leases	$5.30	$4.40	$4.10
Contractual Obligation	$93.20	'	'

Employee_Benefits_Details

Employee Benefits (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Defined Contribution Plan, Cost Recognized	$1.50	$1.70	$1.70
Employee Benefits (Textual) [Abstract]	'	'	'
Employer contribution to retirement plan	'The employer contribution represents a matching contribution at a rate of 50% of each employee’s first six percent contribution. Accordingly, each employee participating during Plan-Year 2013, is entitled up to a maximum of three percent of his or her eligible annual payroll.	'	'
Rate of contribution made by the employer	50.00%	'	'
Employee rate at which matching contribution made by employer	6.00%	'	'
Maximum rate entitled to each employee under all the plans	3.00%	'	'

Acquisition_of_Evolution_Robot2

Acquisition of Evolution Robotics, Inc. Acquisition of Evolution Robotics, Inc. (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Business Acquisition, Pro Forma Information [Abstract]	'	'
Revenue	$445,469	$482,850
Net Income	$8,723	$31,778

Acquisition_of_Evolution_Robot3

Acquisition of Evolution Robotics, Inc. Acquisition of Evolution Robotics, Inc. (Details Textual) (Evolution Robotics, Inc. (ER) [Member], USD $)	0 Months Ended
In Millions, unless otherwise specified	Oct. 02, 2012
Evolution Robotics, Inc. (ER) [Member]	'
Business Acquisition [Line Items]	'
Ownership percentage acquired	100.00%
Total acquisition date fair value of the consideration transferred	$74.80
Amount of purchase price placed into an escrow account to settle certain claims for indemnification for breaches	$8.88

Goodwill_and_other_intangible_2

Goodwill and other intangible assets (Details) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets, Net [Abstract]	'	'
Intangible assets cost	$31,500	$31,500
Intangible assets accumulated amortization	7,044	3,276
Finite-lived intangible assets, accumulated impairment loss	1,788	'
Total	22,668	28,224
Completed technology [Member]	'	'
Finite-Lived Intangible Assets, Net [Abstract]	'	'
Intangible assets cost	30,600	30,600
Intangible assets accumulated amortization	6,202	2,468
Finite-lived intangible assets, accumulated impairment loss	1,788	'
Total	22,610	28,132
Research contracts [Member]	'	'
Finite-Lived Intangible Assets, Net [Abstract]	'	'
Intangible assets cost	100	100
Intangible assets accumulated amortization	100	100
Finite-lived intangible assets, accumulated impairment loss	0	'
Total	0	0
Tradename [Member]	'	'
Finite-Lived Intangible Assets, Net [Abstract]	'	'
Intangible assets cost	800	800
Intangible assets accumulated amortization	742	708
Finite-lived intangible assets, accumulated impairment loss	0	'
Total	$58	$92

Goodwill_and_other_intangible_3

Goodwill and other intangible assets (Details 1) (USD $)	12 Months Ended
	Dec. 28, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Impairment of Intangible Assets, Finite-lived	$1,800,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]	'
2013	3,522,000
2014	3,482,000
2015	3,457,000
2016	3,457,000
2017	3,457,000
Total	$17,375,000

Goodwill_and_other_intangible_4

Goodwill and other intangible assets (Details Textual) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Business Acquisition [Line Items]	'	'	'
Impairment of Intangible Assets, Finite-lived	$1,800,000	'	'
Goodwill, Impairment Loss	200,000	'	'
Goodwill	48,751,000	48,951,000	'
Amortization expense related to acquisition of intangible assets	3,800,000	1,200,000	903,000
Goodwill, Impaired, Accumulated Impairment Loss	200,000	'	'
Evolution Robotics, Inc. (ER) [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Goodwill	41,000,000	41,000,000	'
Nekton Research LLC [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Goodwill	7,709,000	7,909,000	'
Minimum [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Estimated useful lives for intangible assets	'2 years	'	'
Maximum [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Estimated useful lives for intangible assets	'10 years	'	'
Defense & Security Robots [Member] | Nekton Research LLC [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Goodwill	'	7,709,000	'
Research Reporting Unit [Member] | Nekton Research LLC [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Goodwill	'	$200,000	'

Restructuring_Charges_Restruct1

Restructuring Charges Restructuring Charges (Details) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Restructuring Reserve [Roll Forward]	'	'	'
Balance at beginning of period	$197,000	$0	$0
Charges	3,296,000	3,679,000	1,015,000
Utilization	-2,818,000	-3,482,000	-1,015,000
Balance at end of period	675,000	197,000	0
Other Restructuring [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Restructuring charges incurred	3,300,000	3,700,000	1,000,000
Restructuring Reserve [Roll Forward]	'	'	'
Charges	$1,800,000	'	'

Industry_Segment_Geographic_In2

Industry Segment Geographic Information and Significant Customers (Details) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 28, 2013

Sep. 28, 2013

Jun. 29, 2013

Mar. 30, 2013

Sep. 29, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Dec. 28, 2013

Dec. 29, 2012

Dec. 31, 2011

Revenue:

'

'

'

'

'

'

'

'

'

'

'

Total revenue

$126,343

$124,501

$130,362

$106,195

$126,298

$111,445

$97,807

$100,694

$487,401

$436,244

$465,500

Cost of revenue:

'

'

'

'

'

'

'

'

'

'

'

Total cost of revenue

'

'

'

'

'

'

'

'

266,247

241,896

257,847

Gross margin:

'

'

'

'

'

'

'

'

'

'

'

Gross margin

58,930

54,061

61,605

46,558

58,476

52,816

38,552

44,504

221,154

194,348

207,653

Research and development

'

'

'

'

'

'

'

'

63,649

[1]

57,066

[1]

60,100

[1]

Selling and marketing

'

'

'

'

'

'

'

'

71,529

[1]

66,412

[1]

50,477

[1]

General and administrative

'

'

'

'

'

'

'

'

53,358

[1]

45,698

[1]

43,753

[1]

Other income (expense), net

'

'

'

'

'

'

'

'

-203

435

218

Income before income taxes

'

'

'

'

'

'

'

'

32,415

25,607

53,541

Home Robots [Member]

'

'

'

'

'

'

'

'

'

'

'

Revenue:

'

'

'

'

'

'

'

'

'

'

'

Total revenue

'

'

'

'

'

'

'

'

427,853

356,805

278,551

Cost of revenue:

'

'

'

'

'

'

'

'

'

'

'

Total cost of revenue

'

'

'

'

'

'

'

'

217,011

174,756

151,299

Gross margin:

'

'

'

'

'

'

'

'

'

'

'

Gross margin

'

'

'

'

'

'

'

'

210,842

182,049

127,252

Defense & Security Robots [Member]

'

'

'

'

'

'

'

'

'

'

'

Revenue:

'

'

'

'

'

'

'

'

'

'

'

Total revenue

'

'

'

'

'

'

'

'

50,003

70,948

175,119

Cost of revenue:

'

'

'

'

'

'

'

'

'

'

'

Total cost of revenue

'

'

'

'

'

'

'

'

24,975

40,468

81,797

Gross margin:

'

'

'

'

'

'

'

'

'

'

'

Gross margin

'

'

'

'

'

'

'

'

25,028

30,480

93,322

Other Segments [Member]

'

'

'

'

'

'

'

'

'

'

'

Revenue:

'

'

'

'

'

'

'

'

'

'

'

Total revenue

'

'

'

'

'

'

'

'

9,545

8,491

11,830

Cost of revenue:

'

'

'

'

'

'

'

'

'

'

'

Total cost of revenue

'

'

'

'

'

'

'

'

24,261

26,672

24,751

Gross margin:

'

'

'

'

'

'

'

'

'

'

'

Gross margin

'

'

'

'

'

'

'

'

($14,716)

($18,181)

($12,921)

[1]

Stock-based compensation recorded in fiscal 2013, 2012, and 2011 breaks down by expense classification as follows: Fiscal Year Ended December 28, 2013 December 29, 2012 December 31, 2011 (In thousands)Cost of product revenue$700 $889 $1,069Research and development2,700 1,904 1,349Selling and marketing1,246 808 724General and administrative8,763 7,382 5,642

Industry_Segment_Geographic_In3

Industry Segment, Geographic Information and Significant Customers (Details Textual) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]	'	'	'
Number of reportable segments	2	'	'
Goodwill	48,751,000	48,951,000	'
Intangible assets, net	22,668,000	28,224,000	'
Investment in Advanced Scientific Concepts	10,501,000	8,500	'
Number of customer generating major revenues	15	'	'
Evolution Robotics, Inc. (ER) [Member]	'	'	'
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]	'	'	'
Goodwill	41,000,000	41,000,000	'
Government Contracts Concentration Risk [Member]	'	'	'
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]	'	'	'
Concentration Risk, Percentage	6.20%	15.10%	36.10%
Foreign [Member]	'	'	'
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]	'	'	'
Concentration Risk, Percentage	59.50%	57.30%	45.50%
Home Robots [Member]	'	'	'
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]	'	'	'
Concentration Risk, Percentage	75.30%	75.40%	74.00%
Home Robots [Member] | Evolution Robotics, Inc. (ER) [Member]	'	'	'
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]	'	'	'
Goodwill	41,000,000	'	'
Intangible assets, net	22,600,000	'	'
Home Robots [Member] | Major Distributor [Domain]	'	'	'
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]	'	'	'
Concentration Risk, Percentage	33.20%	30.60%	'
Defense & Security Robots [Member] | Business Acquisition Nekton [Member]	'	'	'
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]	'	'	'
Goodwill	7,700,000	'	'
Intangible assets, net	0	'	'
Advanced Scientific Concepts, Inc. [Member] | Defense & Security Robots [Member]	'	'	'
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]	'	'	'
Investment in Advanced Scientific Concepts	2,500,000	'	'

Quarterly_Information_Unaudite2

Quarterly Information (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Details of Quarterly Information (Unaudited)	'	'	'	'	'	'	'	'	'	'	'
Revenue	$126,343	$124,501	$130,362	$106,195	$126,298	$111,445	$97,807	$100,694	$487,401	$436,244	$465,500
Gross margin	58,930	54,061	61,605	46,558	58,476	52,816	38,552	44,504	221,154	194,348	207,653
Net income (loss)	$3,188	$7,804	$8,294	$8,355	$15,207	$7,375	$653	($5,938)	$27,641	$17,297	$40,191
Diluted earnings (loss) per share	$0.11	$0.26	$0.28	$0.29	$0.54	$0.26	$0.02	($0.21)	$0.94	$0.61	$1.44