Calix (CALX) 10-Q 31 Jul 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 28, 2014	Jul. 21, 2014
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'CALIX, INC	'
Entity Central Index Key	'0001406666	'
Document Type	'10-Q	'
Document Period End Date	28-Jun-14	'
Amendment Flag	'false	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	50,914,092

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Jun. 28, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$32,543	$82,747
Marketable securities	46,439	0
Restricted cash	295	295
Accounts receivable, net	47,330	43,520
Inventory	45,888	51,071
Deferred cost of revenue	15,957	21,076
Prepaid expenses and other current assets	5,038	5,757
Total current assets	193,490	204,466
Property and equipment, net	17,289	17,473
Goodwill	116,175	116,175
Intangible assets, net	34,460	43,740
Other assets	1,503	1,745
Total assets	362,917	383,599
Current liabilities:	'	'
Accounts payable	12,850	23,163
Accrued liabilities	34,689	32,075
Deferred revenue	26,346	34,862
Total current liabilities	73,885	90,100
Long-term portion of deferred revenue	18,640	18,431
Other long-term liabilities	958	1,145
Total liabilities	93,483	109,676
Commitments and contingencies (See Note 7)	'	'
Stockholders’ equity:	'	'
Preferred stock, $0.025 par value; 5,000,000 shares authorized; no shares issued and outstanding as of June 28, 2014 and December 31, 2013	0	0
Common stock, $0.025 par value; 100,000,000 shares authorized; 50,910,446 shares and 50,224,952 shares issued and outstanding as of June 28, 2014 and December 31, 2013, respectively	1,273	1,256
Additional paid-in capital	791,756	782,253
Accumulated other comprehensive income	159	190
Accumulated deficit	-523,754	-509,776
Total stockholders’ equity	269,434	273,923
Total liabilities and stockholders’ equity	$362,917	$383,599

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jun. 28, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]	'	'
Preferred stock, par value	$0.03	$0.03
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.03	$0.03
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	50,910,446	50,224,952
Common stock, shares outstanding	50,910,446	50,224,952

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $)	3 Months Ended				6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 28, 2014		Jun. 29, 2013		Jun. 28, 2014		Jun. 29, 2013
Revenue	$98,005		$94,439		$183,825		$184,987
Cost of revenue:	'		'		'		'
Products and services	51,575	[1]	49,846	[1]	98,381	[1]	97,191	[1]
Amortization of intangible assets	2,088		2,088		4,176		4,176
Total cost of revenue	53,663		51,934		102,557		101,367
Gross profit	44,342		42,505		81,268		83,620
Operating expenses:	'		'		'		'
Research and development	19,544	[1]	20,035	[1]	39,174	[1]	40,206	[1]
Sales and marketing	18,455	[1]	17,079	[1]	35,845	[1]	32,880	[1]
General and administrative	7,681	[1]	7,684	[1]	14,932	[1]	15,815	[1]
Amortization of intangible assets	2,552		2,552		5,104		5,104
Total operating expenses	48,232		47,350		95,055		94,005
Loss from operations	-3,890		-4,845		-13,787		-10,385
Interest and other income (expense), net:	'		'		'		'
Interest income	30		1		34		2
Interest expense	-58		-42		-115		-70
Other income (expense), net	70		-43		103		-322
Loss before provision for income taxes	-3,848		-4,929		-13,765		-10,775
Provision for income taxes	103		224		213		581
Net loss	-3,951		-5,153		-13,978		-11,356
Net loss per common share:	'		'		'		'
Net loss per common share, basic and diluted (in dollars per share)	($0.08)		($0.10)		($0.28)		($0.23)
Weighted-average number of shares used to compute net loss per common share, basic and diluted (in shares)	50,573		49,153		50,425		49,034
Other comprehensive (loss) income, net of tax:	'		'		'		'
Unrealized gains (losses) on available-for-sale marketable securities adjustment, net	-25		0		-25		0
Foreign currency translation adjustment, net	-17		30		-6		12
Total other comprehensive (loss) income	-42		30		-31		12
Comprehensive loss	-3,993		-5,123		-14,009		-11,344
Stock-based compensation	4,404		5,275		8,306		9,994
Cost of revenue	'		'		'		'
Other comprehensive (loss) income, net of tax:	'		'		'		'
Stock-based compensation	354		377		708		728
Research and development	'		'		'		'
Other comprehensive (loss) income, net of tax:	'		'		'		'
Stock-based compensation	1,306		1,300		2,486		2,486
Sales and marketing	'		'		'		'
Other comprehensive (loss) income, net of tax:	'		'		'		'
Stock-based compensation	1,462		1,464		2,830		2,743
General and administrative	'		'		'		'
Other comprehensive (loss) income, net of tax:	'		'		'		'
Stock-based compensation	$1,282		$2,134		$2,282		$4,037
[1]	Includes stock-based compensation as follows: Three Months Ended June 28, 2014 and June 29, 2013, Six Months Ended June 28, 2014 and June 29, 2013: Cost of revenue - $354, $377, $708, $728; Research and development - $1,306, $1,300, $2,486, $2,486; Sales and marketing - $1,462, $1,464, $2,830, $2,743; General administrative - $1,282, $2,134, $2,282, $4,037; Total - $4,404, $5,275, $8,306, $9,994.

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 28, 2014	Jun. 29, 2013
Operating activities:	'	'
Net loss	($13,978)	($11,356)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:	'	'
Depreciation and amortization	4,522	5,363
Loss on retirement of property and equipment	0	560
Amortization of intangible assets	9,280	9,280
Amortization of premiums related to available-for-sale securities	108	0
Stock-based compensation	8,306	9,994
Changes in operating assets and liabilities:	'	'
Accounts receivable, net	-3,809	-3,207
Inventory	5,183	5,880
Deferred cost of revenue	5,119	-7,991
Prepaid expenses and other assets	960	-2,009
Accounts payable	-10,313	-90
Accrued liabilities	2,601	464
Deferred revenue	-8,307	16,001
Other long-term liabilities	-188	311
Net cash (used in) provided by operating activities	-516	23,200
Investing activities:	'	'
Purchase of marketable securities	-46,572	0
Purchase of property and equipment	-4,328	-3,265
Net cash used in investing activities	-50,900	-3,265
Financing activities:	'	'
Proceeds from exercise of stock options	139	288
Proceeds from employee stock purchase plan	2,453	2,464
Taxes paid for awards vested under equity incentive plans	-1,377	-312
Net cash (used in) provided by financing activities	1,215	2,440
Effect of exchange rate changes on cash and cash equivalents	-3	9
Net (decrease) increase in cash and cash equivalents	-50,204	22,384
Cash and cash equivalents at beginning of period	82,747	46,995
Cash and cash equivalents at end of period	32,543	69,379
Non-cash investing activities:	'	'
Property and equipment acquired using credits from Ericsson Inc.	$0	$125

Company_and_Basis_of_Presentat

Company and Basis of Presentation (Notes)	6 Months Ended
	Jun. 28, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Company and Basis of Presentation	'
	Company and Basis of Presentation
	Company
	Calix, Inc. (together with its subsidiaries, “Calix,” the “Company,” “our,” “we,” or “us”) was incorporated in August 1999, and is a Delaware corporation. The Company is a leading provider in North America of broadband communications access systems and software for fiber- and copper-based network architectures that enable communications service providers ("CSPs") to transform their networks and connect to their residential and business subscribers. The Company enables CSPs to provide a wide range of revenue-generating services, from basic voice and data to advanced broadband services, over legacy and next-generation access networks. The Company focuses solely on CSP access networks, the portion of the network that governs available bandwidth and determines the range and quality of services that can be offered to subscribers. The Company develops and sells carrier-class hardware and software products, which the Company refers to as the Unified Access portfolio, that are designed to enhance and transform CSP access networks to meet the changing demands of subscribers rapidly and cost-effectively.
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements, including the accounts of Calix, Inc. and its wholly-owned subsidiaries, have been prepared in accordance with the requirements of the U.S. Securities and Exchange Commission (“SEC”) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by U.S. generally accepted accounting principles (“GAAP”) can be condensed or omitted. In the opinion of management, the financial statements include all normal and recurring adjustments that are considered necessary for the fair presentation of the Company’s financial position and operating results. All significant intercompany balances and transactions have been eliminated in consolidation. The Condensed Consolidated Balance Sheet at December 31, 2013 has been derived from the audited financial statements at that date.
	The results of the Company’s operations can vary during each quarter of the year. Therefore, the results and trends in these interim financial statements may not be the same as those for the full year or any future periods. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the audited financial statements for the year ended December 31, 2013, included in the Company’s Form 10-K.
	The Company's fiscal year begins on January 1st and ends on December 31st. Quarterly periods are based on a 4-4-5 fiscal calendar with the first, second and third fiscal quarters ending on the 13th Saturday of each fiscal period. As a result, the Company had one fewer day in the six months ended June 28, 2014 than in the six months ended June 29, 2013, and the same number of days in the three months ended June 28, 2014 as in the three months ended June 29, 2013. The preparation of financial statements in conformity with GAAP for interim financial reporting requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Actual results could differ from those estimates.

Significant_Accounting_Policie

Significant Accounting Policies (Notes)	6 Months Ended
	Jun. 28, 2014
Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	Significant Accounting Policies
	The Company’s significant accounting policies are disclosed in our Annual Report on Form 10-K for the year ended December 31, 2013. Our significant accounting policies did not change during the six months ended June 28, 2014.
	Recent Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), which provides guidance for revenue recognition. ASU 2014-09 supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, and most industry-specific guidance. Additionally, it supersedes some cost guidance included in Subtopic 605-35, Revenue Recognition-Construction-Type and Production-Type Contracts, and creates new Subtopic 340-40, Other Assets and Deferred Costs-Contracts with Customers. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under the previous guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The standard will be effective for the Company in the first quarter of fiscal 2017. Early adoption is not permitted. The Company is currently assessing the potential impact on its financial statements from adopting this new guidance.
	In July 2013, the FASB issued Accounting Standards Update No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the FASB Emerging Issues Task Force) ("ASU 2013-11"), which provides explicit guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward or a tax credit carryforward exists. Under the new standard update, the Company’s unrecognized tax benefit should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward or a tax credit carryforward. The amendments should be applied prospectively to all unrecognized tax benefits that exist at the effective date. The accounting standard update became effective for the Company in the first quarter of 2014. As the Company’s disclosures already conform to the required presentation, adoption of this standard did not impact the financial position or results of operations of the Company.

Cash_Cash_Equivalents_And_Mark

Cash, Cash Equivalents And Marketable Securities (Notes)	6 Months Ended
	Jun. 28, 2014
Cash and Cash Equivalents [Abstract]	'
Cash, Cash Equivalents, and Marketable Securities	'
	Cash, Cash Equivalents and Marketable Securities
	The Company has invested its excess cash primarily in money market funds and highly liquid corporate debt instruments. The Company considers all investments with maturities of three months or less when purchased to be cash equivalents. Marketable securities represent highly liquid debt instruments with maturities greater than 90 days at date of purchase. Marketable securities with maturities greater than one year are classified as current because management considers all marketable securities to be available for current operations.
	The Company’s investments have been classified and accounted for as available-for-sale. Such investments are recorded at fair value and unrealized holding gains and losses are reported as a separate component of accumulated other comprehensive income in stockholders’ equity until realized. Realized gains and losses on sales of marketable securities, if any, are reclassified from accumulated other comprehensive income to results of operations as other income (expense). The Company, to date, has not determined that any of the unrealized losses on its investments are considered to be other-than-temporary. The Company reviews its investment portfolio to determine if any security is other-than-temporarily impaired, which would require the Company to record an impairment charge in the period any such determination is made. In making this judgment, the Company evaluates, among other things, the duration and extent to which the fair value of a security is less than its cost; the financial condition of the issuer and any changes thereto; and the Company’s intent and ability to sell, or whether the Company will more likely than not be required to sell, the security before recovery of its amortized cost basis. The Company has evaluated its investments as of June 28, 2014 and has determined that no investments with unrealized losses are other-than-temporarily impaired. No investments have been in a continuous loss position greater than one year
	Cash, cash equivalents and marketable securities consisted of the following (in thousands):
		June 28,		December 31,
		2014		2013
	Cash and cash equivalents:
	Cash	$	17,377	$	62,905
	Money market funds	15,166		19,842
	Total cash and cash equivalents	32,543		82,747
	Marketable securities:
	Corporate debt securities	41,048		—
	Commercial paper	5,391		—
	Total marketable securities	46,439		—
	Total cash, cash equivalents and marketable securities	$	78,982	$	82,747
	The carrying amounts of our money market funds approximate their fair values due to their nature, duration and short maturities.
	As of June 28, 2014, the amortized cost and fair value of marketable securities were as follows (in thousands):
		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	Corporate debt securities	$	41,073	$	1	$	(26	)	$	41,048
	Commercial paper	5,391		—		$	—		5,391
	Total marketable securities	$	46,464	$	1	$	(26	)	$	46,439
	As of June 28, 2014, there are no available-for-sale securities that have been in a continuous unrealized loss position in excess of twelve months.
	As of June 28, 2014, the amortized cost and fair value of marketable securities by contractual maturity were as follows (in thousands):
		Amortized Cost		Fair Value
	Due in 1 year or less	$	23,744	$	23,734
	Due in 1-2 years	$	22,720	$	22,705
	Total marketable securities	$	46,464	$	46,439

Fair_Value_Measurements_Notes

Fair Value Measurements (Notes)	6 Months Ended
	Jun. 28, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements
	In accordance with Accounting Standard Codification ("ASC") Topic 820, Fair Value Measurements and Disclosures, (“ASC Topic 820”), the Company measures its cash equivalents and marketable securities at fair value on a recurring basis. ASC Topic 820 clarifies that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, ASC Topic 820 establishes a three-tier value hierarchy, which prioritizes the inputs used in measuring fair value as follows:
	Level 1 – Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.
	Level 2 – Observable inputs other than quoted prices included in Level 1 for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-driven valuations in which all significant inputs and significant value drivers are observable in active markets.
	Level 3 – Unobservable inputs to the valuation derived from fair valuation techniques in which one or more significant inputs or significant value drivers are unobservable.
	The following table sets forth the Company's financial assets measured at fair value on a recurring basis as of June 28, 2014 and December 31, 2013, based on the three-tier fair value hierarchy (in thousands):
	As of June 28, 2014	Level 1		Level 2		Total
	Money market funds	$	15,166	$	—	$	15,166
	Corporate debt securities	—		41,048		41,048
	Commercial paper	—		5,391		5,391
	Total	$	15,166	$	46,439	$	61,605
	As of December 31, 2013	Level 1		Level 2		Total
	Money market funds	$	19,842	$	—	$	19,842
	Corporate debt securities	—		—		—
	Commercial paper	—		—		—
	Total	$	19,842	$	—	$	19,842
	The fair values of money market funds classified as Level 1 were derived from quoted market prices as active markets for these instruments exist. The fair values of corporate debt securities and commercial paper classified as Level 2 were derived from quoted market prices for similar instruments indexed to prevailing market yield rates. The Company has no level 3 financial assets. The Company did not have any transfers between Level 1 and Level 2 of the fair value hierarchy during the six months ended June 28, 2014 and June 29, 2013.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets (Notes)	6 Months Ended
	Jun. 28, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	Goodwill and Intangible Assets
	Goodwill
	Goodwill was recorded as a result of the Company's acquisitions of Occam Networks, Inc. (“Occam”) in February 2011 and Optical Solutions, Inc. ("OSI") in February 2006. This goodwill is not deductible for tax purposes, and there have been no adjustments to goodwill since the acquisition dates.
	Goodwill is not amortized but instead is subject to an annual impairment test or more frequently if events or changes in circumstances indicate that it may be impaired. We evaluate goodwill on an annual basis at the end of the second quarter of each year. Management has determined that we operate as a single reporting unit and, therefore, evaluates goodwill impairment at the enterprise level. Management assessed qualitative factors to determine whether it was more likely than not (that is, a likelihood of more than 50 percent) that the fair value of the Company was less than its carrying amount, including goodwill, as of June 28, 2014. In assessing the qualitative factors, management considered the impact of these key factors: macro-economic conditions, industry and market environment, overall financial performance of the Company, cash flow from operating activities, market capitalization and stock price. Management concluded that the fair value of the Company was more likely than not greater than its carrying amount as of June 28, 2014. As such, it was not necessary to perform the two-step goodwill impairment test at the time.
	Based on the above assessment, the Company concluded that there was no impairment to the carrying value of the Company's goodwill as of June 28, 2014.
	Intangible Assets
	Intangible assets are carried at cost, less accumulated amortization. The details of intangible assets as of June 28, 2014 and December 31, 2013 are disclosed in the following table (in thousands):
		28-Jun-14							31-Dec-13
		Gross		Accumulated			Net		Gross		Accumulated			Net
		Carrying		Amortization					Carrying		Amortization
		Amount							Amount
	Core developed technology	$	68,964	$	(51,515	)	$	17,449	$	68,964	$	(47,339	)	$	21,625
	Customer relationships	54,740		(37,729		)	17,011		54,740		(32,625		)	22,115
	Total intangible assets, excluding goodwill	$	123,704	$	(89,244	)	$	34,460	$	123,704	$	(79,964	)	$	43,740
	Amortization expense was $4.6 million for the three months ended June 28, 2014 and June 29, 2013. Amortization expense was $9.3 million for the six months ended June 28, 2014 and June 29, 2013.
	As of June 28, 2014, expected future amortization expense for the fiscal years indicated is as follows (in thousands):
	Period	Expected
		Amortization
		Expense
	Remainder of 2014	$	9,280
	2015	18,561
	2016	5,805
	2017	814
	Total	$	34,460

Balance_Sheet_Details_Notes

Balance Sheet Details (Notes)	6 Months Ended
	Jun. 28, 2014
Balance Sheet Related Disclosures [Abstract]	'
Balance Sheet Details	'
	Balance Sheet Details
	Accounts receivable, net consisted of the following (in thousands):
		June 28,			December 31,
		2014			2013
	Accounts receivable	$	48,382		$	44,642
	Allowance for doubtful accounts	(390		)	(358		)
	Product return reserve	(662		)	(764		)
	Accounts receivable, net	$	47,330		$	43,520
	Inventory consisted of the following (in thousands):
		June 28,			December 31,
		2014			2013
	Raw materials	$	5,486		$	6,591
	Finished goods	40,402			44,480
	Total inventory	$	45,888		$	51,071
	Property and equipment, net consisted of the following (in thousands):
		June 28,			December 31,
		2014			2013
	Test equipment	$	37,544		$	36,932
	Computer equipment and software	28,860			27,280
	Furniture and fixtures	1,642			1,614
	Leasehold improvements	7,346			7,077
	Total	75,392			72,903
	Accumulated depreciation and amortization	(58,103		)	(55,430		)
	Property and equipment, net	$	17,289		$	17,473
	Accrued liabilities consisted of the following (in thousands):
		June 28,			December 31,
		2014			2013
	Accrued warranty	$	10,638		$	10,856
	Accrued compensation and related benefits	14,506			13,127
	Accrued professional and consulting fees	2,441			1,634
	Accrued excess and obsolete inventory at contract manufacturers	541			756
	Accrued customer rebates	880			712
	Accrued business travel expenses	755			540
	Sales and use tax payable	756			521
	Income taxes payable	477			368
	Accrued other	3,695			3,561
	Total accrued liabilities	$	34,689		$	32,075
	Deferred revenue consisted of the following (in thousands):
		June 28,			December 31,
		2014			2013
	Product and services - current	$	23,453		$	32,051
	Extended warranty - current	2,893			2,811
	Extended warranty - non-current	18,556			18,335
	Product and services - non-current	84			96
	Total deferred revenue	$	44,986		$	53,293
	Deferred cost of revenue consisted entirely of products and services.

Commitments_and_Contingencies_

Commitments and Contingencies (Notes)	6 Months Ended
	Jun. 28, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Commitments
	The Company’s principal commitments consist of obligations under operating leases for office space and non-cancelable outstanding purchase obligations. These commitments as of December 31, 2013 are disclosed in our Annual Report on Form 10-K, and have not changed materially during the six months ended June 28, 2014 except for the following agreements entered into during 2014.
	On March 4, 2014, the Company entered into a new commercial lease for a facility in Santa Barbara, California. The lease is set to commence on July 1, 2014 and expire on June 30, 2019. The total minimum future payment commitment under this lease is $1.0 million. In connection with this lease, the Company received an incentive consisting of $0.4 million that can be used for leasehold improvements, which will be amortized over the shorter of the lease term or estimated useful life of the assets.
	On March 20, 2014, the Company entered into a new commercial lease for a facility in Richardson, Texas. This lease is set to commence on August 1, 2014 and expire on January 31, 2022. The total minimum future payment commitment under this lease is $1.5 million. In connection with this lease, the Company received an incentive consisting of $0.4 million that can be used for leasehold improvements, which will be amortized over the shorter of the lease term or estimated useful life of the assets.
	Accrued Warranty
	The Company provides a warranty for its hardware products. Hardware generally has a one to five-year warranty from the date of shipment. The Company accrues for potential warranty claims based on the Company’s historical claims experience. The adequacy of the accrual is reviewed on a periodic basis and adjusted, if necessary, based on additional information as it becomes available.
	Changes in the Company’s warranty reserve were as follows (in thousands):
		Three Months Ended						Six Months Ended
		June 28,			June 29,			June 28,			June 29,
		2014			2013			2014			2013
	Balance at beginning of period	$	10,827		$	11,985		$	10,856		$	11,762
	Warranty charged to cost of revenue	1,053			1,615			1,962			2,782
	Utilization of warranty	(1,242		)	(1,277		)	(2,180		)	(2,221		)
	Balance at end of period	$	10,638		$	12,323		$	10,638		$	12,323
	Litigation
	From time to time, the Company is involved in various legal proceedings arising from the normal course of business activities.
	On September 16, 2010, the Company, two direct, wholly-owned subsidiaries of the Company, and Occam entered into an Agreement and Plan of Merger and Reorganization (the “Merger Agreement”). In response to the announcement of the Merger Agreement on October 6, 2010, a purported class action complaint was filed by stockholders of Occam in the Delaware Court of Chancery: Steinhardt v. Howard-Anderson, et al. (Case No. 5878-VCL). On November 24, 2010, these stockholders filed an amended complaint (the “amended Steinhardt complaint”). The amended Steinhardt complaint named Occam (which has since been merged into Calix) and the members of the Occam board of directors as defendants. The amended Steinhardt complaint did not name Calix as a defendant.
	The amended Steinhardt complaint sought injunctive relief rescinding the merger transaction and an award of damages in an unspecified amount, as well as plaintiffs' costs, attorney's fees, and other relief.
	The merger transaction was completed on February 22, 2011. On January 6, 2012, the Delaware court ruled on a motion for sanctions brought by the defendants against certain of the lead plaintiffs. The Delaware court found that lead plaintiffs Michael Steinhardt, Steinhardt Overseas Management, L.P., and Ilex Partners, L.L.C., collectively the “Steinhardt Plaintiffs,” had engaged in improper trading of Calix shares, and dismissed the Steinhardt Plaintiffs from the case with prejudice. The court further held that the Steinhardt Plaintiffs are: (i) barred from receiving any recovery from the litigation, (ii) required to self-report to the SEC, (iii) directed to disclose their improper trading in any future application to serve as lead plaintiff, and (iv) ordered to disgorge trading profits of $0.5 million, to be distributed to the remaining members of the class of former Occam stockholders. The Delaware court also granted the motion of the remaining lead plaintiffs, Herbert Chen and Derek Sheeler, for class certification, and certified Messrs. Chen and Sheeler as class representatives. The certified class is a non-opt-out class consisting of all owners of Occam common stock whose shares were converted to shares of Calix on the date of the merger transaction, with the exception of the defendants in the Delaware action and their affiliates. Chen and Sheeler, on behalf of the class of similarly situated former Occam stockholders, continue to seek an award of damages in an unspecified amount.
	Fact discovery in the case closed on April 30, 2013. On June 11, 2013, the plaintiffs filed their Second Amended Class Action Complaint for Breach of Fiduciary Duty (“Second Amended Complaint”). The Second Amended Complaint adds Occam's former CFO as a defendant, and alleges that each of the defendants breached their fiduciary duties by failing to attempt to obtain the best purchase price for Occam and failing to disclose certain allegedly material facts about the merger transaction in the preliminary proxy statement and prospectus included in the Registration Statement on Form S-4 filed with the SEC on November 2, 2010.
	On July 17, 2013, attorneys representing all of the defendants named in the Second Amended Complaint filed Defendants' Opening Brief in Support of Their Motion for Summary Judgment, arguing that all defendants are entitled to summary judgment on all counts of the Second Amended Complaint. Plaintiffs' answering brief to the motion for summary judgment was filed on September 3, 2013, and defendants' reply brief was filed on October 4, 2013. A hearing on the motion for summary judgment was held on December 6, 2013.
	On April 8, 2014, the Court of Chancery of the State of Delaware issued an Opinion granting in part and denying in part the Defendants’ Motion for Summary Judgment. The court granted summary judgment in favor of those defendants who served solely as directors of Occam with respect to all claims alleging improper actions in connection with the Occam sale process. The ruling also granted summary judgment on all claims as to Occam, the corporate entity. The court left in place process-based claims against Occam’s former CEO and CFO, and also declined to grant summary judgment on separate claims that the director and officer defendants breached their fiduciary duties by issuing a proxy statement for Occam’s stockholder vote that allegedly contained misleading disclosures and had material omissions.
	On June 12, 2014 the plaintiffs filed a Motion to Compel Production of Documents by Defendants and Jefferies & Company, Inc. and For Sanctions Against Defendants. This motion seeks additional documents from defendants and from Jefferies, Occam’s former advisor, and requests that the court impose severe sanctions, up to and including a finding of liability against defendants. Defendants reject the suggestion that any additional documents should be produced and vigorously oppose the imposition of any sanctions.
	The Company continues to believe that the allegations in the Second Amended Complaint are without merit and intends to continue to vigorously contest the action as it moves forward toward trial. However, there can be no assurance that the defendants will be successful in defending this ongoing action. In addition, the Company has obligations, under certain circumstances, to hold harmless and indemnify each of the former Occam directors and officers against judgments, fines, settlements and expenses related to claims against such directors and otherwise to the fullest extent permitted under Delaware law and Occam's bylaws and certificate of incorporation. Such obligations may apply to this lawsuit and may ultimately result in the payment of indemnification amounts by the Company. The plaintiffs have not communicated any specific demand for damages. At this time, the Company is unable to quantify its indemnification risk, and an adverse result at trial could have a material adverse effect on the Company’s business, operating results or financial condition.The trial is scheduled for February 16, 2015.
	The Company is not currently a party to any other legal proceedings that, if determined adversely to the Company, would individually or in the aggregate have a material adverse effect on the Company's business, operating results or financial condition.

Net_Loss_per_Share_Notes

Net Loss per Share (Notes)	6 Months Ended
	Jun. 28, 2014
Earnings Per Share [Abstract]	'
Net Loss per Share	'
	Net Loss per Share
	The following table sets forth the computation of basic and diluted net loss per share for the periods indicated (in thousands, except per share data):
		Three Months Ended						Six Months Ended
		June 28,			June 29,			June 28,			June 29,
		2014			2013			2014			2013
	Numerator:
	Net loss	$	(3,951	)	$	(5,153	)	$	(13,978	)	$	(11,356	)
	Denominator:
	Weighted-average common shares outstanding	50,573			49,153			50,425			49,034
	Basic and diluted net loss per common share	$	(0.08	)	$	(0.10	)	$	(0.28	)	$	(0.23	)
	Potentially dilutive shares, weighted average	5,262			5,526			5,011			5,251
	For all periods presented, unvested restricted stock awards are included in the calculation of weighted-average common shares outstanding because such shares are participating securities; however, the impact was immaterial.

Stockholders_Equity_Notes

Stockholders' Equity (Notes)	6 Months Ended
	Jun. 28, 2014
Stockholders' Equity Note [Abstract]	'
Stockholders' Equity	'
	Stockholders’ Equity
	Equity Incentive Plans
	The Company maintains three equity incentive plans, the 2000 Stock Plan, the 2002 Stock Plan and the 2010 Equity Incentive Award Plan (together, the “Plans”). These plans were approved by the stockholders and are described in the Company’s Form 10-K filed with the SEC on February 20, 2014. The Company also maintains a Long Term Incentive Program, under the 2010 Equity Incentive Award Plan. Under the Long Term Incentive Program, certain key employees of the Company are eligible for equity awards based on the Company’s stock price performance. To date, awards granted under the Plans consist of stock options, restricted stock units ("RSUs"), restricted stock awards ("RSAs"), and performance restricted stock units ("PRSUs").
	Stock Options
	During the three months ended June 28, 2014, the Company did not grant stock options. During the six months ended June 28, 2014, the Company granted 551,000 stock options at a weighted-average grant date fair value of $4.43 per share. During the three months ended June 28, 2014, 23,916 stock options were exercised at a weighted-average exercise price of $4.94 per share. During the six months ended June 28, 2014, 28,811 stock options were exercised at a weighted-average exercise price of $4.83 per share. As of June 28, 2014, unrecognized stock-based compensation expense of $6.8 million related to stock options, net of estimated forfeitures, was expected to be recognized over a weighted-average period of 2.5 years.
	Restricted Stock Units
	During the three months ended June 28, 2014, 663,696 RSUs were granted with a weighted-average grant date fair value of $8.77 per share. During the six months ended June 28, 2014, 679,396 RSUs were granted with a weighted-average grant date fair value of $8.76 per share. During the three months ended June 28, 2014, 223,615 RSUs vested, net of shares withheld at the then-current value equivalent to the employees' minimum statutory obligation for applicable income and other employment taxes, and were converted to an equivalent number of shares of common stock. Taxes withheld from employees of $0.7 million were remitted to the relevant taxing authorities during the three months ended June 28, 2014. During the six months ended June 28, 2014, 225,751 RSUs vested, net of shares withheld at the then-current value equivalent to the employees' minimum statutory obligation for applicable income and other employment taxes, and were converted to an equivalent number of shares of common stock. Taxes withheld from employees of $0.7 million were remitted to the relevant taxing authorities during the six months ended June 28, 2014. As of June 28, 2014, unrecognized stock-based compensation expense of $12.1 million related to RSUs, net of estimated forfeitures, was expected to be recognized over a weighted-average period of 2.3 years.
	Performance Restricted Stock Units
	In 2012, the Company commenced granting PRSUs to its executives with two-year and three-year performance periods. The performance criterion is based on the relative total shareholder return (“TSR”) of Calix common stock as compared to the TSR of the Company’s peer group. The TSR is calculated by dividing (a) the average closing trading price for the 90-day period ending on the last day of the applicable performance period by (b) the average closing trading price for the 90-day period immediately preceding the first day of the applicable performance period. This TSR is then used to derive the achievement ratio, which is then multiplied by the number of units in the grant to derive the common stock to be issued for each performance period, which may equal from zero percent (0%) to two hundred percent (200%) of the target award.
	During the three months ended June 28, 2014, no PRSUs were granted. During the six months ended June 28, 2014, the Company granted 144,000 PRSUs with a weighted-average grant date fair value of $8.00 per unit. During the three months ended June 28, 2014, 4,681 PRSUs, net of shares withheld at the then-current value equivalent to the employees' minimum statutory obligation for applicable income and other employment taxes, were converted to an equivalent number of shares of common stock. Taxes withheld from employees of $23 thousand were remitted to the relevant taxing authorities during the three months ended June 28, 2014. During the six months ended June 28, 2014, 94,249 PRSUs, net of shares withheld at the then-current value equivalent to the employees' minimum statutory obligation for applicable income and other employment taxes, were converted to an equivalent number of shares of common stock. Taxes withheld from employees of $0.5 million were remitted to the relevant taxing authorities during the six months ended June 28, 2014. As of June 28, 2014, unrecognized stock-based compensation expense of $1.9 million related to PRSUs, net of estimated forfeitures, was expected to be recognized over a weighted-average period of 1.4 years.
	Restricted Stock Awards
	During the three and six months ended June 28, 2014, no RSAs were granted. Upon the vesting of RSAs during the three and six months ended June 28, 2014, taxes withheld from employees of $0.1 million were remitted to the relevant taxing authorities. As of June 28, 2014, unrecognized stock-based compensation expense of $1.6 million related to RSAs, net of estimated forfeitures, was expected to be recognized over a weighted-average period of 1.1 years.
	Employee Stock Purchase Plan
	The Company’s Amended and Restated Employee Stock Purchase Plan (“ESPP”) allows employees to purchase shares of the Company’s common stock through payroll deductions of up to 15 percent of their annual compensation subject to certain Internal Revenue Code limitations. In addition, no participant may purchase more than 2,000 shares of common stock in each offering period.
	The offering periods under the ESPP are six-month periods commencing on June 1 and December 1 of each year. The price of common stock purchased under the plan is 85 percent of the lower of the fair market value of the common stock on the commencement date and exercise date of each six-month offering period. As of June 28, 2014, there were 2,220,221 shares available for issuance under the ESPP.
	During the three and six months ended June 28, 2014, 353,594 shares were purchased under the ESPP. As of June 28, 2014, unrecognized stock-based compensation expense of $0.6 million related to the ESPP was expected to be recognized over a remaining service period of 5 months.
	Stock-Based Compensation Expense
	In accordance with ASC Topic 718, Compensation - Stock Compensation, ("ASC Topic 718"), stock-based compensation expense associated with stock options, RSUs, PRSUs, RSAs, and purchase rights under the ESPP is measured at the grant date based on the fair value of the award, and is recognized, net of forfeitures, as expense over the remaining requisite service period on a straight-line basis.
	The Company values RSUs and RSAs at the closing market price of the Company’s common stock on the date of grant.
	The fair value of PRSUs with a market condition is estimated on the date of award, using a Monte Carlo simulation model to estimate the TSR of the Company's stock in relation to the peer group over each performance period. Compensation cost on PRSUs with a market condition is not adjusted for subsequent changes in the Company's stock performance or the level of ultimate vesting.
	The Company estimates the fair value of stock options at the grant date using the Black-Scholes option-pricing model. This model requires the use of the following assumptions:
	(i) Expected volatility of the Company's common stock - Starting in the fourth quarter of 2012, the Company computes its expected volatility assumption based on a blended volatility (50% historical volatility and 50% implied volatility from traded options on the Company's common stock). The selection of a blended volatility assumption was based upon the Company's assessment that a blended volatility is more representative of the Company's future stock price trend as it weighs the historical volatility with the future implied volatility. Prior to the fourth quarter of 2012, due to the lack of a sufficient history of the Company's stock prices, the Company’s computation of expected volatility was based on the Company’s peer group in the industry in which the Company does business.
	(ii) Expected life of the option award - Represents the weighted-average period that the stock options are expected to remain outstanding. The Company’s computation of expected life utilizes the simplified method in accordance with Staff Accounting Bulletin No. 110 ("SAB 110") due to the lack of sufficient historical exercise data to provide a reasonable basis upon which to estimate expected term. The mid-point between the vesting date and the expiration date is used as the expected term under this method.
	(iii) Expected dividend yield - Assumption is based on the Company's history of not paying dividends and no future expectations of dividend payouts.
	(iv) Risk-free interest rate - Based on the U.S. Treasury yield curve in effect at the time of grant with maturities approximating the grant’s expected life.
	The following table summarizes the weighted-average assumptions used in estimating the grant-date fair value of stock options in the periods indicated:
		Three Months Ended		Six Months Ended
		June 28,	June 29,	June 28,	June 29,
		2014	2013	2014	2013
	Expected volatility	N/A	N/A	54%	62%
	Expected life (years)	N/A	N/A	6.15	6.05
	Expected dividend yield	N/A	N/A	—	—
	Risk-free interest rate	N/A	N/A	1.91%	1.12%
	Modification of Stock Awards
	In February 2013, the Company entered into a Transition and Separation Agreement ("Agreement") with Roger Weingarth, the Company's former Executive Vice President and Chief Operating Officer. Under the Agreement, Mr. Weingarth transitioned to the role of advisor to the Chief Executive Officer of the Company effective as of April 1, 2013, and terminated his employment with the Company on March 31, 2014 ("Termination Date"). Upon his termination, the Agreement provided for, among other things, the acceleration of the vesting of his unvested stock options, RSAs and RSUs held by him as of the Termination Date.
	In accordance with ASC Topic 718, total fair value of the accelerated stock awards after the modification was $0.6 million, which was recognized on a straight-line basis over the remaining service period through the Termination Date. During the three and six months ended June 28, 2014, $0.1 million of the total fair value has been recognized in general and administrative expenses.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Notes)	6 Months Ended
	Jun. 28, 2014
Equity [Abstract]	'
Accumulated Other Comprehensive Income	'
	Accumulated Other Comprehensive Income
	The table below summarizes the changes in accumulated other comprehensive income by component for the periods indicated (in thousands).
		Three Months Ended
		28-Jun-14									29-Jun-13
		Unrealized Gains (Losses) on Available-for-Sale Marketable Securities			Foreign Currency Translation Adjustments			Total			Unrealized Gains (Losses) on Available-for-Sale Marketable Securities		Foreign Currency Translation Adjustments		Total
	Balance at beginning of period	$	—		$	201		$	201		$	—	$	114	$	114
	Other comprehensive (loss) income before
	reclassifications	(25		)	(17		)	(42		)	—		30		30
	Reclassification of realized gains and losses
	on sales of marketable securities	—			—			—			—		—		—
	Total other comprehensive (loss) income	(25		)	(17		)	(42		)	—		30		30
	Balance at end of period	$	(25	)	$	184		$	159		$	—	$	144	$	144
		Six Months Ended
		28-Jun-14									29-Jun-13
		Unrealized Gains (Losses) on Available-for-Sale Marketable Securities			Foreign Currency Translation Adjustments			Total			Unrealized Gains (Losses) on Available-for-Sale Marketable Securities		Foreign Currency Translation Adjustments		Total
	Balance at beginning of period	$	—		$	190		$	190		$	—	$	132	$	132
	Other comprehensive (loss) income before
	reclassifications	(25		)	(6		)	(31		)	—		12		12
	Reclassification of realized gains and losses
	on sales of marketable securities	—			—			—			—		—		—
	Total other comprehensive (loss) income	(25		)	(6		)	(31		)	—		12		12
	Balance at end of period	$	(25	)	$	184		$	159		$	—	$	144	$	144
	Realized gains and losses on sales of available-for-sale marketable securities, if any, are reclassified from accumulated other comprehensive income to "Other income (expense)" in our Condensed Statements of Comprehensive Loss.

Credit_Facility_Notes

Credit Facility (Notes)	6 Months Ended
	Jun. 28, 2014
Line of Credit Facility [Abstract]	'
Credit Facility	'
	Credit Facility
	The Company had a revolving credit facility ("Prior Credit Facility") of $30.0 million with Silicon Valley Bank based upon a percentage of eligible accounts receivable, which matured on June 30, 2013. After the Prior Credit Facility matured on June 30, 2013, the Company cash collateralized any outstanding letters of credit with Silicon Valley Bank. As of June 28, 2014, the Company had $0.3 million cash restricted for collateralizing the outstanding letters of credit with Silicon Valley Bank.
	On July 29, 2013, the Company entered into a credit agreement with Bank of America, N.A. The credit agreement is structured such that other financial institutions can at a later time become party to the credit agreement through an amendment via a syndication process (collectively, together with Bank of America, N.A., the "Lenders"). The credit agreement provides for a revolving facility in the aggregate principal amount of up to $50.0 million, which includes a $20.0 million sublimit for the issuance of letters of credit and a $10.0 million sublimit for a swingline facility. Subject to customary conditions, up to $25.0 million of the revolving facility may be converted to a term loan facility at any time prior to the maturity of the revolving facility. The revolving facility matures on July 29, 2016, but may be extended up to two times (each extension for an additional one-year period) upon mutual agreement of the Company and the Lenders. The credit facility is secured by substantially all of our assets, including our intellectual property. Proceeds of the credit facility may be used for general corporate purposes and permitted acquisitions.
	Loans under the credit facility bear interest at an annual rate equal to the base rate plus 0.75% to 1.25% or LIBOR plus 2.00% to 2.50% based on a leverage ratio of consolidated funded indebtedness to consolidated Adjusted EBITDA (customarily defined). Interest on the revolving facility is due quarterly, and any outstanding interest and principal is due on the maturity date of the revolving facility. The Company is required to repay principal on a term loan in twenty equal quarterly payments from the date the Company enters into a term loan, and all outstanding principal and accrued interest is due on the revolving facility maturity date. Swingline loans must be repaid on the earlier of (i) ten business days after a loan is made and (ii) the revolving facility maturity date. The Company is also required to pay commitment fees of 0.25% per year on any unused portions of this facility.
	The credit facility includes affirmative and negative covenants applicable to the Company that are typical for credit facilities of this type. Furthermore, the credit agreement requires us to maintain certain financial covenants, including a maximum consolidated leverage ratio, and a minimum consolidated liquidity ratio of cash, cash equivalents and accounts receivable to consolidated funded indebtedness. As of June 28, 2014, the Company was in compliance with these requirements.
	The credit facility also includes customary events of default, the occurrence and continuation of which would provide the Lenders with the right to demand immediate repayment of any principal and unpaid interest under the credit facility, and to exercise remedies against us and the collateral securing the loans under the credit facility.
	As of June 28, 2014, the Company had no outstanding letters of credit or borrowings under the credit facility.
	The Company incurred $0.3 million of debt issuance costs that were directly attributable to the issuance of this credit facility. These costs will be amortized over three years starting from the effective date of the credit facility. As of June 28, 2014 and December 31, 2013, the unamortized debt issuance costs of $0.2 million were included within "Other assets" in our Condensed Consolidated Balance Sheets.

Income_Taxes_Notes

Income Taxes (Notes)	6 Months Ended
	Jun. 28, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	The following table presents the provision for income taxes from continuing operations and the effective tax rates for the periods indicated (in thousands, except percentages):
		Three Months Ended						Six Months Ended
		June 28,			June 29,			June 28,			June 29,
		2014			2013			2014			2013
	Provision for income taxes	$	103		$	224		$	213		$	581
	Effective tax rate	(2.7		)%	(4.5		)%	(1.5		)%	(5.4		)%
	The Company has incurred operating losses since inception and, as such, has not received a tax benefit for these losses. The income tax provision for the first six months of 2014 and 2013 primarily consisted of federal alternative minimum tax and state and foreign income taxes. The effective tax rates differ from the U.S. federal statutory rate of 34.0% due primarily to the tax affected change in the valuation allowance against the Company’s deferred tax assets.
	ASC Topic 740, Income Taxes, ("ASC Topic 740"), provides for the recognition of deferred tax assets if realization of such assets is more likely than not. The Company has established and continues to maintain a full valuation allowance against its net deferred tax assets, with the exception of certain foreign deferred tax assets, as the Company does not believe that realization of those assets is more likely than not.
	As of June 28, 2014 and December 31, 2013, the Company had unrecognized tax benefits of $14.4 million, none of which would affect the Company's effective tax rate if recognized.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 28, 2014
Accounting Policies [Abstract]	'
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), which provides guidance for revenue recognition. ASU 2014-09 supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, and most industry-specific guidance. Additionally, it supersedes some cost guidance included in Subtopic 605-35, Revenue Recognition-Construction-Type and Production-Type Contracts, and creates new Subtopic 340-40, Other Assets and Deferred Costs-Contracts with Customers. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under the previous guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The standard will be effective for the Company in the first quarter of fiscal 2017. Early adoption is not permitted. The Company is currently assessing the potential impact on its financial statements from adopting this new guidance.
	In July 2013, the FASB issued Accounting Standards Update No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the FASB Emerging Issues Task Force) ("ASU 2013-11"), which provides explicit guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward or a tax credit carryforward exists. Under the new standard update, the Company’s unrecognized tax benefit should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward or a tax credit carryforward. The amendments should be applied prospectively to all unrecognized tax benefits that exist at the effective date. The accounting standard update became effective for the Company in the first quarter of 2014. As the Company’s disclosures already conform to the required presentation, adoption of this standard did not impact the financial position or results of operations of the Company.

Cash_Cash_Equivalents_And_Mark1

Cash, Cash Equivalents And Marketable Securities (Tables)	6 Months Ended
	Jun. 28, 2014
Cash and Cash Equivalents [Abstract]	'
Summary of cash and cash equivalents	'
	Cash, cash equivalents and marketable securities consisted of the following (in thousands):
		June 28,		December 31,
		2014		2013
	Cash and cash equivalents:
	Cash	$	17,377	$	62,905
	Money market funds	15,166		19,842
	Total cash and cash equivalents	32,543		82,747
	Marketable securities:
	Corporate debt securities	41,048		—
	Commercial paper	5,391		—
	Total marketable securities	46,439		—
	Total cash, cash equivalents and marketable securities	$	78,982	$	82,747
Amortized cost and fair value of marketable securities	'
	As of June 28, 2014, the amortized cost and fair value of marketable securities were as follows (in thousands):
		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	Corporate debt securities	$	41,073	$	1	$	(26	)	$	41,048
	Commercial paper	5,391		—		$	—		5,391
	Total marketable securities	$	46,464	$	1	$	(26	)	$	46,439
Amortized cost and fair value of marketable securities by contractual maturity	'
	As of June 28, 2014, the amortized cost and fair value of marketable securities by contractual maturity were as follows (in thousands):
		Amortized Cost		Fair Value
	Due in 1 year or less	$	23,744	$	23,734
	Due in 1-2 years	$	22,720	$	22,705
	Total marketable securities	$	46,464	$	46,439

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 28, 2014
Fair Value Disclosures [Abstract]	'
Summary of fair values of financial assets	'
	The following table sets forth the Company's financial assets measured at fair value on a recurring basis as of June 28, 2014 and December 31, 2013, based on the three-tier fair value hierarchy (in thousands):
	As of June 28, 2014	Level 1		Level 2		Total
	Money market funds	$	15,166	$	—	$	15,166
	Corporate debt securities	—		41,048		41,048
	Commercial paper	—		5,391		5,391
	Total	$	15,166	$	46,439	$	61,605
	As of December 31, 2013	Level 1		Level 2		Total
	Money market funds	$	19,842	$	—	$	19,842
	Corporate debt securities	—		—		—
	Commercial paper	—		—		—
	Total	$	19,842	$	—	$	19,842

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 28, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of intangible assets	'
	Intangible assets are carried at cost, less accumulated amortization. The details of intangible assets as of June 28, 2014 and December 31, 2013 are disclosed in the following table (in thousands):
		28-Jun-14							31-Dec-13
		Gross		Accumulated			Net		Gross		Accumulated			Net
		Carrying		Amortization					Carrying		Amortization
		Amount							Amount
	Core developed technology	$	68,964	$	(51,515	)	$	17,449	$	68,964	$	(47,339	)	$	21,625
	Customer relationships	54,740		(37,729		)	17,011		54,740		(32,625		)	22,115
	Total intangible assets, excluding goodwill	$	123,704	$	(89,244	)	$	34,460	$	123,704	$	(79,964	)	$	43,740
Expected future amortization	'
	As of June 28, 2014, expected future amortization expense for the fiscal years indicated is as follows (in thousands):
	Period	Expected
		Amortization
		Expense
	Remainder of 2014	$	9,280
	2015	18,561
	2016	5,805
	2017	814
	Total	$	34,460

Balance_Sheet_Details_Tables

Balance Sheet Details (Tables)	6 Months Ended
	Jun. 28, 2014
Balance Sheet Related Disclosures [Abstract]	'
Summary of accounts receivable, net	'
	Accounts receivable, net consisted of the following (in thousands):
		June 28,			December 31,
		2014			2013
	Accounts receivable	$	48,382		$	44,642
	Allowance for doubtful accounts	(390		)	(358		)
	Product return reserve	(662		)	(764		)
	Accounts receivable, net	$	47,330		$	43,520
Summary of inventory	'
	Inventory consisted of the following (in thousands):
		June 28,			December 31,
		2014			2013
	Raw materials	$	5,486		$	6,591
	Finished goods	40,402			44,480
	Total inventory	$	45,888		$	51,071
Summary of property and equipment, net	'
	Property and equipment, net consisted of the following (in thousands):
		June 28,			December 31,
		2014			2013
	Test equipment	$	37,544		$	36,932
	Computer equipment and software	28,860			27,280
	Furniture and fixtures	1,642			1,614
	Leasehold improvements	7,346			7,077
	Total	75,392			72,903
	Accumulated depreciation and amortization	(58,103		)	(55,430		)
	Property and equipment, net	$	17,289		$	17,473
Summary of accrued liabilities	'
	Accrued liabilities consisted of the following (in thousands):
		June 28,			December 31,
		2014			2013
	Accrued warranty	$	10,638		$	10,856
	Accrued compensation and related benefits	14,506			13,127
	Accrued professional and consulting fees	2,441			1,634
	Accrued excess and obsolete inventory at contract manufacturers	541			756
	Accrued customer rebates	880			712
	Accrued business travel expenses	755			540
	Sales and use tax payable	756			521
	Income taxes payable	477			368
	Accrued other	3,695			3,561
	Total accrued liabilities	$	34,689		$	32,075
Summary of deferred revenue	'
	Deferred revenue consisted of the following (in thousands):
		June 28,			December 31,
		2014			2013
	Product and services - current	$	23,453		$	32,051
	Extended warranty - current	2,893			2,811
	Extended warranty - non-current	18,556			18,335
	Product and services - non-current	84			96
	Total deferred revenue	$	44,986		$	53,293

Commitments_and_Contingencies_1

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 28, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Product warranty activities	'
	Changes in the Company’s warranty reserve were as follows (in thousands):
		Three Months Ended						Six Months Ended
		June 28,			June 29,			June 28,			June 29,
		2014			2013			2014			2013
	Balance at beginning of period	$	10,827		$	11,985		$	10,856		$	11,762
	Warranty charged to cost of revenue	1,053			1,615			1,962			2,782
	Utilization of warranty	(1,242		)	(1,277		)	(2,180		)	(2,221		)
	Balance at end of period	$	10,638		$	12,323		$	10,638		$	12,323

Net_Loss_per_Share_Tables

Net Loss per Share (Tables)	6 Months Ended
	Jun. 28, 2014
Earnings Per Share [Abstract]	'
Schedule of net loss per share	'
	The following table sets forth the computation of basic and diluted net loss per share for the periods indicated (in thousands, except per share data):
		Three Months Ended						Six Months Ended
		June 28,			June 29,			June 28,			June 29,
		2014			2013			2014			2013
	Numerator:
	Net loss	$	(3,951	)	$	(5,153	)	$	(13,978	)	$	(11,356	)
	Denominator:
	Weighted-average common shares outstanding	50,573			49,153			50,425			49,034
	Basic and diluted net loss per common share	$	(0.08	)	$	(0.10	)	$	(0.28	)	$	(0.23	)
	Potentially dilutive shares, weighted average	5,262			5,526			5,011			5,251

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 28, 2014
Stockholders' Equity Note [Abstract]	'
Weighted-average assumptions used to estimate the fair value of stock options	'
	The following table summarizes the weighted-average assumptions used in estimating the grant-date fair value of stock options in the periods indicated:
		Three Months Ended		Six Months Ended
		June 28,	June 29,	June 28,	June 29,
		2014	2013	2014	2013
	Expected volatility	N/A	N/A	54%	62%
	Expected life (years)	N/A	N/A	6.15	6.05
	Expected dividend yield	N/A	N/A	—	—
	Risk-free interest rate	N/A	N/A	1.91%	1.12%

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 28, 2014
Equity [Abstract]	'
Accumulated other comprehensive income details	'
	The table below summarizes the changes in accumulated other comprehensive income by component for the periods indicated (in thousands).
		Three Months Ended
		28-Jun-14									29-Jun-13
		Unrealized Gains (Losses) on Available-for-Sale Marketable Securities			Foreign Currency Translation Adjustments			Total			Unrealized Gains (Losses) on Available-for-Sale Marketable Securities		Foreign Currency Translation Adjustments		Total
	Balance at beginning of period	$	—		$	201		$	201		$	—	$	114	$	114
	Other comprehensive (loss) income before
	reclassifications	(25		)	(17		)	(42		)	—		30		30
	Reclassification of realized gains and losses
	on sales of marketable securities	—			—			—			—		—		—
	Total other comprehensive (loss) income	(25		)	(17		)	(42		)	—		30		30
	Balance at end of period	$	(25	)	$	184		$	159		$	—	$	144	$	144
		Six Months Ended
		28-Jun-14									29-Jun-13
		Unrealized Gains (Losses) on Available-for-Sale Marketable Securities			Foreign Currency Translation Adjustments			Total			Unrealized Gains (Losses) on Available-for-Sale Marketable Securities		Foreign Currency Translation Adjustments		Total
	Balance at beginning of period	$	—		$	190		$	190		$	—	$	132	$	132
	Other comprehensive (loss) income before
	reclassifications	(25		)	(6		)	(31		)	—		12		12
	Reclassification of realized gains and losses
	on sales of marketable securities	—			—			—			—		—		—
	Total other comprehensive (loss) income	(25		)	(6		)	(31		)	—		12		12
	Balance at end of period	$	(25	)	$	184		$	159		$	—	$	144	$	144

Income_Taxes_Tables

Income Taxes (Tables)	6 Months Ended
	Jun. 28, 2014
Income Tax Disclosure [Abstract]	'
Schedule of income taxes	'
	The following table presents the provision for income taxes from continuing operations and the effective tax rates for the periods indicated (in thousands, except percentages):
		Three Months Ended						Six Months Ended
		June 28,			June 29,			June 28,			June 29,
		2014			2013			2014			2013
	Provision for income taxes	$	103		$	224		$	213		$	581
	Effective tax rate	(2.7		)%	(4.5		)%	(1.5		)%	(5.4		)%

Cash_Cash_Equivalents_And_Mark2

Cash, Cash Equivalents And Marketable Securities (Details) (USD $)	Jun. 28, 2014	Dec. 31, 2013	Jun. 29, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Cash and Cash Equivalents [Line Items]	'	'	'	'
Cash and cash equivalents	$32,543	$82,747	$69,379	$46,995
Marketable Securities	46,439	0	'	'
Cash, Cash Equivalents And Marketable Securities	78,982	82,747	'	'
Corporate debt securities	'	'	'	'
Cash and Cash Equivalents [Line Items]	'	'	'	'
Marketable Securities	41,048	0	'	'
Commercial paper	'	'	'	'
Cash and Cash Equivalents [Line Items]	'	'	'	'
Marketable Securities	5,391	0	'	'
Cash	'	'	'	'
Cash and Cash Equivalents [Line Items]	'	'	'	'
Cash and cash equivalents	17,377	62,905	'	'
Money market funds	'	'	'	'
Cash and Cash Equivalents [Line Items]	'	'	'	'
Cash and cash equivalents	$15,166	$19,842	'	'

Cash_Cash_Equivalents_And_Mark3

Cash, Cash Equivalents And Marketable Securities - Amortized Cost and Fair Value (Details) (USD $)	Jun. 28, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$46,464	'
Gross Unrealized Gains	1	'
Gross Unrealized Losses	-26	'
Fair Value	46,439	0
Corporate debt securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	41,073	'
Gross Unrealized Gains	1	'
Gross Unrealized Losses	-26	'
Fair Value	41,048	0
Commercial paper	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	5,391	'
Gross Unrealized Gains	0	'
Gross Unrealized Losses	0	'
Fair Value	$5,391	$0

Cash_Cash_Equivalents_And_Mark4

Cash, Cash Equivalents And Marketable Securities - Contractual Maturity (Details) (USD $)	Jun. 28, 2014
In Thousands, unless otherwise specified
Cash and Cash Equivalents [Abstract]	'
Marketable securities due in 1 year or less, amortized cost	$23,744
Marketable securities due in 1-2 years, amortized cost	22,720
Marketable securities, amortized cost	46,464
Marketable securities due in 1 year or less, fair value	23,734
Marketable securities due in 1-2 years, fair value	22,705
Marketable securities, fair value	$46,439

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Value Measurements (Details) (USD $)	Jun. 28, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Marketable Securities	$46,439	$0
Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Money market funds	15,166	19,842
Total	61,605	19,842
Fair Value, Measurements, Recurring [Member] | Level 1	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Money market funds	15,166	19,842
Total	15,166	19,842
Fair Value, Measurements, Recurring [Member] | Level 2	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Money market funds	0	0
Total	46,439	0
Corporate debt securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Marketable Securities	41,048	0
Corporate debt securities | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Marketable Securities	41,048	0
Corporate debt securities | Fair Value, Measurements, Recurring [Member] | Level 1	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Marketable Securities	0	0
Corporate debt securities | Fair Value, Measurements, Recurring [Member] | Level 2	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Marketable Securities	41,048	0
Commercial paper	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Marketable Securities	5,391	0
Commercial paper | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Marketable Securities	5,391	0
Commercial paper | Fair Value, Measurements, Recurring [Member] | Level 1	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Marketable Securities	0	0
Commercial paper | Fair Value, Measurements, Recurring [Member] | Level 2	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Marketable Securities	$5,391	$0

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) (USD $)	Jun. 28, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	$123,704	$123,704
Accumulated Amortization	-89,244	-79,964
Net	34,460	43,740
Core developed technology	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	68,964	68,964
Accumulated Amortization	-51,515	-47,339
Net	17,449	21,625
Customer relationships	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	54,740	54,740
Accumulated Amortization	-37,729	-32,625
Net	$17,011	$22,115

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Expected Future Amortization (Details) (USD $)	Jun. 28, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Expected future amortization	'	'
Remainder of 2014	$9,280	'
2015	18,561	'
2016	5,805	'
2017	814	'
Net	$34,460	$43,740

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Textual (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'	'	'	'
Accumulated impairment loss, goodwill	$0	'	$0	'
Amortization expense	$4,640,000	$4,640,000	$9,280,000	$9,280,000

Balance_Sheet_Details_Accounts

Balance Sheet Details - Accounts Receivable (Details) (USD $)	Jun. 28, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Summary of accounts receivable, net	'	'
Accounts receivable	$48,382	$44,642
Allowance for doubtful accounts	-390	-358
Product return reserve	-662	-764
Accounts receivable, net	$47,330	$43,520

Balance_Sheet_Details_Inventor

Balance Sheet Details - Inventory (Details) (USD $)	Jun. 28, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Summary of inventory, net	'	'
Raw materials	$5,486	$6,591
Finished goods	40,402	44,480
Total inventory	$45,888	$51,071

Balance_Sheet_Details_Property

Balance Sheet Details - Property and Equipment, net (Details) (USD $)	Jun. 28, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Summary of property and equipment, net	'	'
Property and equipment, gross	$75,392	$72,903
Accumulated depreciation and amortization	-58,103	-55,430
Property and equipment, net	17,289	17,473
Test equipment	'	'
Summary of property and equipment, net	'	'
Property and equipment, gross	37,544	36,932
Computer equipment and software	'	'
Summary of property and equipment, net	'	'
Property and equipment, gross	28,860	27,280
Furniture and fixtures	'	'
Summary of property and equipment, net	'	'
Property and equipment, gross	1,642	1,614
Leasehold improvements	'	'
Summary of property and equipment, net	'	'
Property and equipment, gross	$7,346	$7,077

Balance_Sheet_Details_Accrued_

Balance Sheet Details - Accrued Liabilities (Details) (USD $)	Jun. 28, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Summary of accrued liabilities	'	'
Accrued warranty	$10,638	$10,856
Accrued compensation and related benefits	14,506	13,127
Accrued professional and consulting fees	2,441	1,634
Accrued excess and obsolete inventory at contract manufacturers	541	756
Accrued customer rebates	880	712
Accrued business travel expenses	755	540
Sales and use tax payable	756	521
Income taxes payable	477	368
Accrued other	3,695	3,561
Total accrued liabilities	$34,689	$32,075

Balance_Sheet_Details_Deferred

Balance Sheet Details - Deferred Revenue (Details) (USD $)	Jun. 28, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred Revenue Arrangement [Line Items]	'	'
Deferred revenue, current	$26,346	$34,862
Deferred revenue, noncurrent	18,640	18,431
Deferred revenue	44,986	53,293
Product and Services [Member]	'	'
Deferred Revenue Arrangement [Line Items]	'	'
Deferred revenue, current	23,453	32,051
Deferred revenue, noncurrent	84	96
Extended Warranty [Member]	'	'
Deferred Revenue Arrangement [Line Items]	'	'
Deferred revenue, current	2,893	2,811
Deferred revenue, noncurrent	$18,556	$18,335

Commitments_and_Contingencies_2

Commitments and Contingencies - Textual (Details) (USD $)	0 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jan. 06, 2012	Sep. 16, 2010	Jun. 28, 2014	Jun. 28, 2014	Mar. 04, 2014	Mar. 20, 2014
		Subsidiary	Minimum [Member]	Maximum [Member]	Santa Barbara [Member]	Richardson [Member]
Commitments and Contingencies [Line Items]	'	'	'	'	'	'
Minimum future lease payments	'	'	'	'	$1	$1.50
Incentive from Lessor	'	'	'	'	0.4	0.4
Warranty period	'	'	'1 year	'5 years	'	'
Number of subsidiaries	'	2	'	'	'	'
Trading profits	$0.50	'	'	'	'	'

Commitments_and_Contingencies_3

Commitments and Contingencies - Product Warranty Activities (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Product warranty activities [Roll Forward]	'	'	'	'
Balance at beginning of period	$10,827	$11,985	$10,856	$11,762
Warranty charged to cost of revenue	1,053	1,615	1,962	2,782
Utilization of warranty	-1,242	-1,277	-2,180	-2,221
Balance at end of period	$10,638	$12,323	$10,638	$12,323

Net_Loss_per_Share_Basic_and_D

Net Loss per Share - Basic and Diluted Shares Calculation (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Numerator:	'	'	'	'
Net loss	($3,951)	($5,153)	($13,978)	($11,356)
Denominator:	'	'	'	'
Weighted-average number of shares used to compute net loss per common share, basic and diluted (in shares)	50,573	49,153	50,425	49,034
Basic and diluted net loss per common share (in dollars per share)	($0.08)	($0.10)	($0.28)	($0.23)
Potentially dilutive shares, weighted average (in shares)	5,262	5,526	5,011	5,251

Stockholders_Equity_Weightedav

Stockholders' Equity - Weighted-average Assumptions Used to Estimate Fair Value of Stock Options (Details) (Stock options [Member])	6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Stock options [Member]	'	'
Weighted-average assumptions used to estimate fair value of stock options	'	'
Expected volatility	54.00%	62.00%
Expected life (years)	'6 years 1 month 24 days	'6 years 0 months 18 days
Expected dividend yield	0.00%	0.00%
Risk free interest rate	1.91%	1.12%

Stockholders_Equity_Textual_De

Stockholders' Equity - Textual (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 28, 2014	Jun. 28, 2014	Jun. 29, 2013
	Plan	Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Number of Equity Incentive Plans	3	3	'
Stock options granted	0	551,000	'
Weighted-average grant date fair value per share, stock options	'	$4.43	'
Stock options exercised	23,916	28,811	'
Weighted-average exercise price per share, stock options	$4.94	$4.83	'
Unrecognized stock-based compensation expense, stock options	$6,800,000	$6,800,000	'
Weighted-average amortization period	'	'2 years 6 months	'
Taxes paid for awards vested under equity incentive plans	'	1,377,000	312,000
Weight of historical volatility	'	50.00%	'
Weight of implied volatility	'	50.00%	'
Fair value of accelerated stock awards	'	600,000	'
Fair value recognized for accelerated stock awards	100,000	'	'
Restricted stock units (RSUs) [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Weighted-average amortization period	'	'2 years 3 months 18 days	'
Awards granted	663,696	679,396	'
Weighted-average grant date fair value per share	$8.77	$8.76	'
Awards vested	223,615	225,751	'
Taxes paid for awards vested under equity incentive plans	700,000	700,000	'
Unrecognized stock-based compensation expense	12,100,000	12,100,000	'
Restricted stock awards [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Weighted-average amortization period	'	'1 year 1 month 6 days	'
Awards granted	0	0	'
Taxes paid for awards vested under equity incentive plans	100,000	100,000	'
Unrecognized stock-based compensation expense	1,600,000	1,600,000	'
Employee stock purchase plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Weighted-average amortization period	'0 years 5 months	'	'
Unrecognized stock-based compensation expense	600,000	600,000	'
ESPP, maximum employee payroll deduction percentage	15.00%	15.00%	'
ESPP, maximum number of shares per employee	'	2,000	'
ESPP, discounted purchase price percentage	'	85.00%	'
Shares available for issuance under the ESPP	2,220,221	2,220,221	'
Shares issued under the ESPP	353,594	353,594	'
Performance Restricted Stock Units [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Weighted-average amortization period	'	'1 year 4 months 24 days	'
Awards granted	0	144,000	'
Weighted-average grant date fair value per share	$8	'	'
Taxes paid for awards vested under equity incentive plans	23,000	500,000	'
Unrecognized stock-based compensation expense	$1,900,000	$1,900,000	'
Period of average closing trading price ending on the last day of applicable performance period	'	'90 days	'
Period of average closing trading price preceding first day of performance period	'	'90 days	'
Shares converted into common stock	4,681	94,249	'
Performance Restricted Stock Units [Member] | Minimum [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Performance period	'	'2 years	'
Target performance rate	'	0.00%	'
Performance Restricted Stock Units [Member] | Maximum [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Performance period	'	'3 years	'
Target performance rate	'	200.00%	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'	'
Balance at beginning of period	$201	$114	$190	$132
Other comprehensive (loss) income before reclassifications	-42	30	-31	12
Reclassification of realized gains and losses on sales of marketable securities	0	0	0	0
Total other comprehensive (loss) income	-42	30	-31	12
Balance at end of period	159	144	159	144
Unrealized Gains (Losses) on Available-for-Sale Marketable Securities	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'	'
Balance at beginning of period	0	0	0	0
Other comprehensive (loss) income before reclassifications	-25	0	-25	0
Reclassification of realized gains and losses on sales of marketable securities	0	0	0	0
Total other comprehensive (loss) income	-25	0	-25	0
Balance at end of period	-25	0	-25	0
Foreign Currency Translation Adjustments	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'	'
Balance at beginning of period	201	114	190	132
Other comprehensive (loss) income before reclassifications	-17	30	-6	12
Reclassification of realized gains and losses on sales of marketable securities	0	0	0	0
Total other comprehensive (loss) income	-17	30	-6	12
Balance at end of period	$184	$144	$184	$144

Credit_Facility_Textual_Detail

Credit Facility - Textual (Details) (USD $)

0 Months Ended

6 Months Ended

0 Months Ended

Jul. 29, 2013

Jun. 28, 2014

Dec. 31, 2013

Jul. 29, 2013

Jul. 29, 2013

Jul. 29, 2013

Jul. 29, 2013

Jun. 30, 2013

Jun. 30, 2013

Jul. 29, 2013

Jul. 29, 2013

Jul. 29, 2013

extention

Base Rate [Member]

Base Rate [Member]

LIBOR [Member]

LIBOR [Member]

Prior Credit Facility [Member]

Prior Credit Facility [Member]

Letter of Credit [Member]

Swingline Facility Member [Member]

Term Loan [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Credit Facility [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Credit Facility, Initiation Date

29-Jul-13

'

'

'

'

'

'

'

'

'

'

'

Credit Facility, maximum borrowing capacity

$50,000,000

'

'

'

'

'

'

'

$30,000,000

$20,000,000

$10,000,000

$25,000,000

Credit Facility, Maturity Date

29-Jul-16

'

'

'

'

'

'

30-Jun-13

'

'

'

'

Restricted cash

'

295,000

295,000

'

'

'

'

'

'

'

'

'

Credit Facility, number of one-year period extensions

2

'

'

'

'

'

'

'

'

'

'

'

Credit Facility, Interest Rate Description

'Loans under the credit facility bear interest at an annual rate equal to the base rate plus 0.75% to 1.25% or LIBOR plus 2.00% to 2.50% based on a leverage ratio of consolidated funded indebtedness to consolidated Adjusted EBITDA (customarily defined).

'

'

'

'

'

'

'

'

'

'

'

Credit Facility, Interest Rate Margin

'

'

'

0.75%

1.25%

2.00%

2.50%

'

'

'

'

'

Credit Facility, Frequency of Payment and Payment Terms

'Interest on the revolving facility is due quarterly, and any outstanding interest and principal is due on the maturity date of the revolving facility.

'

'

'

'

'

'

'

'

'

'

'

Credit Facility, outstanding letters of credit

'

0

'

'

'

'

'

'

'

'

'

'

Credit Facility, commitment fee percentage

'

0.25%

'

'

'

'

'

'

'

'

'

'

Debt issuance costs incurred

300,000

'

'

'

'

'

'

'

'

'

'

'

Unamortized debt issuance costs

'

$200,000

'

'

'

'

'

'

'

'

'

'

Income_Taxes_Schedule_of_Incom

Income Taxes - Schedule of Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Income Tax Disclosure [Abstract]	'	'	'	'
Provision for (benefit from) income taxes	$103	$224	$213	$581
Effective income tax rate	-2.70%	-4.50%	-1.50%	-5.40%

Income_Taxes_Textual_Details

Income Taxes - Textual (Details) (USD $)	6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'	'	'
U.S. federal statutory tax rate	34.00%	34.00%	'
Unrecognized tax benefits	$14,400,000	'	$14,400,000
Unrecognized tax benefits that would impact effective tax rate if recognized	$0	'	$0