Infinera (INFN) 10-Q 1 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 28, 2013	Oct. 28, 2013
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	28-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'INFN	'
Entity Registrant Name	'INFINERA CORP	'
Entity Central Index Key	'0001138639	'
Current Fiscal Year End Date	'--12-28	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	119,560,318

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$137,629	$104,666
Short-term investments	151,821	76,146
Accounts receivable, net of allowance for doubtful accounts of $147 in 2013 and $94 in 2012	87,180	107,039
Other receivables	616	2,909
Inventory	123,505	127,809
Deferred inventory costs	1,244	1,029
Prepaid expenses and other current assets	18,924	9,899
Total current assets	520,919	429,497
Property, plant and equipment, net	79,062	80,343
Deferred inventory costs, non-current	19	100
Long-term investments	52,871	2,874
Cost-method investment	9,000	9,000
Long-term restricted cash	3,724	3,868
Deferred tax asset	0	805
Other non-current assets	5,238	1,683
Total assets	670,833	528,170
Current liabilities:	'	'
Accounts payable	29,218	61,428
Accrued expenses	21,290	25,483
Accrued compensation and related benefits	24,621	22,325
Accrued warranty	12,854	7,262
Deferred revenue	25,202	26,744
Deferred tax liability	0	805
Total current liabilities	113,185	144,047
Long-term debt, net	107,350	0
Accrued warranty, non-current	10,308	9,220
Deferred revenue, non-current	3,097	3,210
Other long-term liabilities	18,158	15,557
Commitments and contingencies (Note 14)	'	'
Stockholders’ equity:	'	'
Preferred stock, $0.001 par value Authorized shares – 25,000 and no shares issued and outstanding	0	0
Common stock, $0.001 par value Authorized shares – 500,000 as of September 28, 2013 and December 29, 2012 Issued and outstanding shares – 119,491 as of September 28, 2013 and 112,461 as of December 29, 2012	119	112
Additional paid-in capital	1,016,397	930,618
Accumulated other comprehensive loss	-3,474	-2,228
Accumulated deficit	-594,307	-572,366
Total stockholders’ equity	418,735	356,136
Total liabilities and stockholders’ equity	$670,833	$528,170

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 28, 2013	Dec. 29, 2012
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Net of allowance for doubtful accounts	$147	$94
Preferred stock, par value (USD per share)	$0.00	$0.00
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (USD per share)	$0.00	$0.00
Common stock, authorized shares	500,000,000	500,000,000
Common stock, shares issued	119,491,000	112,461,000
Common stock, shares outstanding	119,491,000	112,461,000

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Revenue:	'	'	'	'
Product	$120,807	$98,853	$348,769	$269,087
Ratable product and related support and services	525	450	1,553	1,504
Services	20,688	12,911	54,708	39,782
Total revenue	142,020	112,214	405,030	310,373
Cost of revenue:	'	'	'	'
Cost of product	66,645	66,510	222,126	181,851
Cost of ratable product and related support and services	40	102	204	459
Cost of services	6,964	4,102	19,973	13,762
Total cost of revenue	73,649	70,714	242,303	196,072
Gross profit	68,371	41,500	162,727	114,301
Operating expenses:	'	'	'	'
Research and development	32,528	27,912	93,935	90,573
Sales and marketing	17,720	19,285	52,921	55,304
General and administrative	11,678	12,508	32,976	35,912
Total operating expenses	61,926	59,705	179,832	181,789
Income (loss) from operations	6,445	-18,205	-17,105	-67,488
Other income (expense), net:	'	'	'	'
Interest income	232	175	636	678
Interest expense	-2,578	0	-3,427	0
Other gain (loss), net:	-444	-617	-805	-892
Total other income (expense), net	-2,790	-442	-3,596	-214
Income (loss) before income taxes	3,655	-18,647	-20,701	-67,702
Provision for income taxes	308	434	1,240	1,540
Net income (loss)	$3,347	($19,081)	($21,941)	($69,242)
Net income (loss) per common share	'	'	'	'
Basic (USD per share)	$0.03	($0.17)	($0.19)	($0.63)
Diluted (USD per share)	$0.03	($0.17)	($0.19)	($0.63)
Weighted average shares used in computing net income (loss) per common share	'	'	'	'
Basic (shares)	118,740	111,579	116,653	110,216
Diluted (shares)	124,679	111,579	116,653	110,216

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income (loss)	$3,347	($19,081)	($21,941)	($69,242)
Other comprehensive income (loss):	'	'	'	'
Unrealized gain (loss) on auction rate securities classified as available-for-sale investments	0	82	0	-143
Reclassification of realized gain on auction rate securities	0	0	-166	0
Unrealized gain (loss) on all other available-for-sale investments	44	69	-64	189
Foreign currency translation adjustment	-98	614	-1,016	352
Tax related to available-for-sale investment	0	-18	0	-19
Net change in accumulated other comprehensive income (loss)	-54	747	-1,246	379
Comprehensive income (loss)	$3,293	($18,334)	($23,187)	($68,863)

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012
Cash Flows from Operating Activities:	'	'
Net income (loss)	($21,941)	($69,242)
Adjustments to reconcile net loss to net cash used in operating activities:	'	'
Depreciation and amortization	18,574	17,274
(Recovery of) provision for other receivables	-88	0
Provision for doubtful accounts	53	94
Amortization of debt discount and issuance costs	2,552	0
Amortization of premium on investments	870	1,610
Stock-based compensation expense	23,802	31,684
Non-cash Tax Benefit	0	-18
Other gain	-243	-479
Changes in assets and liabilities:	'	'
Accounts receivable	19,805	-11,021
Other receivables	2,131	-2,228
Inventory	-3,603	-28,774
Prepaid expenses and other assets	-8,398	33
Deferred inventory costs	-160	4,877
Accounts payable	-30,624	-1,048
Accrued liabilities and other expenses	1,640	3,690
Deferred revenue	-1,655	-6,683
Accrued warranty	6,680	2,434
Net provided by (cash used) in operating activities	9,395	-57,797
Cash Flows from Investing Activities:	'	'
Purchase of available-for-sale investments	-206,528	-50,134
Proceeds from sale of available-for-sale investments	2,850	6,694
Proceeds from maturities and calls of investments	77,143	95,368
Purchase of property and equipment	-13,605	-22,238
Reimbursement of manufacturing capacity advance	0	50
Change in restricted cash	110	-564
Net cash provided by (used in) investing activities	-140,030	29,176
Cash Flows from Financing Activities:	'	'
Proceeds from issuance of debt, net	144,469	0
Proceeds from issuance of common stock	21,551	11,280
Repurchase of common stock	-1,541	-875
Net cash provided by financing activities	164,479	10,405
Effect of exchange rate changes on cash	-881	358
Net change in cash and cash equivalents	32,963	-17,858
Cash and cash equivalents at beginning of period	104,666	94,458
Cash and cash equivalents at end of period	137,629	76,600
Supplemental disclosures of cash flow information:	'	'
Cash paid for income taxes	1,536	755
Supplemental schedule of non-cash financing activities:	'	'
Non-cash settlement for manufacturing capacity advance	0	275
Transfer of inventory to fixed assets	$6,672	$738

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 28, 2013
Accounting Policies [Abstract]	'
Basis of Presentation and Significant Accounting Policies	'
	Basis of Presentation and Significant Accounting Policies
	Infinera Corporation (“Infinera” or the “Company”) prepared its interim condensed consolidated financial statements that accompany these notes in conformity with U.S. generally accepted accounting principles (“U.S. GAAP”) and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”), consistent in all material respects with those applied in the Company’s Annual Report on Form 10-K for the fiscal year ended December 29, 2012.
	The Company has made estimates and judgments affecting the amounts reported in its condensed consolidated financial statements and the accompanying notes. The Company’s actual results may differ materially from these estimates. The accounting estimates that require most significant, difficult, and subjective judgment include revenue recognition, stock-based compensation, inventory valuation, allowances for sales returns, allowances for doubtful accounts, accrued warranty, fair value measurement of the liability component of the convertible senior notes, cash equivalents, fair value measurement of investments, other-than-temporary impairments, derivative instruments and accounting for income taxes.
	The interim financial information is unaudited, but reflects all adjustments that are, in management’s opinion, necessary to provide a fair presentation of results for the interim periods presented. All adjustments are of a normal recurring nature. The Company reclassified certain amounts reported in previous periods to conform to the current presentation. This interim information should be read in conjunction with the consolidated financial statements in the Company’s Annual Report on Form 10-K for the fiscal year ended December 29, 2012.
	There have been no material changes in the Company’s significant accounting policies for the nine months ended September 28, 2013 as compared to those disclosed in the Company’s Annual Report on Form 10-K for the fiscal year ended December 29, 2012.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	9 Months Ended
	Sep. 28, 2013
Accounting Changes and Error Corrections [Abstract]	'
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2013-02, Comprehensive Income (Topic 220) – Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”). ASU 2013-02 requires an entity to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income if the amount being reclassified is required under U.S. GAAP to be reclassified in its entirety to net income. For other amounts that are not required under U.S GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP that provide additional detail about those amounts. The Company adopted the guidance for ASU 2013-02 beginning in its fiscal quarter ended March 30, 2013. Other than requiring additional disclosures, the Company’s adoption of ASU 2013-02 did not have an impact on the Company’s financial position, results of operations or cash flow.
	In July 2013, the FASB issued Accounting Standards Update 2013-11, Income Taxes – Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carry forward, a Similar Tax Loss, or a Tax Credit Carry forwards Exists (“ASU 2013-11”). ASU 2013-11 requires entities to present the unrecognized tax benefits in the financial statements as a liability and not combine it with deferred tax assets to the extent a net operating loss carry-forward, a similar tax loss, or a tax credit carry-forward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose. The assessment of whether a deferred tax asset is available is based on the unrecognized tax benefit and deferred tax asset that exist at the reporting date and should be made presuming disallowance of the tax position at the reporting date. ASU 2013-11 is effective for annual and interim periods for fiscal years beginning on or after December 15, 2013. The Company is currently evaluating ASU 2013-11 and does not expect its adoption to have an impact on the Company’s financial position, results of operations or cash flow.

Fair_Value_Measurements_and_Ot

Fair Value Measurements and Other-Than-Temporary Impairments	9 Months Ended
	Sep. 28, 2013
Text Block [Abstract]	'
Fair Value Measurements and Other-Than-Temporary Impairments	'
	Fair Value Measurements and Other-Than-Temporary Impairments
	Fair Value Measurements
	Pursuant to the accounting guidance for fair value measurements and its subsequent updates, fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and it considers assumptions that market participants would use when pricing the asset or liability.
	Valuation techniques used by the Company are based upon observable and unobservable inputs. Observable or market inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s assumptions about market participant assumptions based on best information available. Observable inputs are the preferred source of values. These two types of inputs create the following fair value hierarchy:
	Level 1		–		Quoted prices in active markets for identical assets or liabilities.
	Level 2		–		Quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	Level 3		–		Prices or valuations that require management inputs that are both significant to the fair value measurement and unobservable.
	The Company measures its cash equivalents, derivative instruments and debt securities at fair value and classifies its securities in accordance with the fair value hierarchy. The Company’s money market funds and U.S. treasuries are classified within Level 1 of the fair value hierarchy and are valued based on quoted prices in active markets for identical securities.
	The Company classifies its certificates of deposit, commercial paper, corporate bonds, and foreign currency exchange forward contracts within Level 2 of the fair value hierarchy as follows:
	Certificates of Deposit
	The Company reviews market pricing and other observable market inputs for the same or similar securities obtained from a number of industry standard data providers. In the event that a transaction is observed for the same or similar security in the marketplace, the price on that transaction reflects the market price and fair value on that day. In the absence of any observable market transactions for a particular security, the fair market value at period end would be equal to the par value. These inputs represent quoted prices for similar assets or these inputs have been derived from observable market data, and result in the classification of these securities as Level 2 of the fair value hierarchy.
	Commercial Paper
	The Company reviews market pricing and other observable market inputs for the same or similar securities obtained from a number of industry standard data providers. In the event that a transaction is observed for the same or similar security in the marketplace, the price on that transaction reflects the market price and fair value on that day and then follows a revised accretion schedule to determine the fair market value at period end. In the absence of any observable market transactions for a particular security, the fair market value at period end is derived by accreting from the last observable market price. These inputs represent quoted prices for similar assets or these inputs have been derived from observable market data accreted mathematically to par, and result in the classification of these securities as Level 2 of the fair value hierarchy.
	Corporate Bonds
	The Company reviews trading activity and pricing for each of the corporate bond securities in its portfolio as of the measurement date and determines if pricing data of sufficient frequency and volume in an active market exists in order to support Level 1 classification of these securities. Since sufficient quoted pricing for identical securities is not available, the Company obtains market pricing and other observable market inputs for similar securities from a number of industry standard data providers. In instances where multiple prices exist for similar securities, these prices are used as inputs into a distribution-curve to determine the fair market value at period end. As a result, the Company classifies its corporate bonds as Level 2 of the fair value hierarchy.
	Foreign Currency Exchange Forward Contracts
	As discussed in Note 5, “Derivative Instruments,” to the Notes to Condensed Consolidated Financial Statements, the Company mainly holds non-speculative foreign exchange forward contracts to hedge certain foreign currency exchange exposures. The Company estimates the fair values of derivatives based on quoted market prices or pricing models using current market rates. Where applicable, these models project future cash flows and discount the future amounts to a present value using market-based observable inputs including interest rate curves, credit risk, foreign exchange rates, and forward and spot prices for currencies. As a result, the Company classifies its derivative instruments as Level 2 of the fair value hierarchy.
	The Company classified its auction rate securities (“ARS”) within Level 3 of the fair value hierarchy. The Company’s ARS were classified within Level 3 because they were valued, in part, by using inputs that were unobservable in the market and were significant to the valuation. During the first quarter of 2013, the Company disposed of its remaining $3.1 million (par value) ARS, with $0.1 million of ARS called at par value and $3.0 million of ARS tendered at 95% of par value. As of September 28, 2013, none of the Company’s existing securities were classified as Level 3 securities.
	The following tables represent the Company’s fair value hierarchy for its assets and liabilities measured at fair value on a recurring basis (in thousands):
		As of September 28, 2013																As of December 29, 2012
		Fair Value Measured Using																Fair Value Measured Using
		Level 1				Level 2				Level 3				Total				Level 1				Level 2		Level 3		Total
	Assets
	Money market funds	$	72,386			$	—			$	—			$	72,386			$	25,560			$	—	$	—	$	25,560
	Certificates of deposit	—				2,640				—				2,640				—				2,160		—		2,160
	Commercial paper	—				88,720				—				88,720				—				14,843		—		14,843
	Corporate bonds	—				109,540				—				109,540				—				57,467		—		57,467
	U.S. treasuries	7,806				—				—				7,806				15,020				—		—		15,020
	ARS	—				—				—				—				—				—		2,873		2,873
	Total assets	$	80,192			$	200,900			$	—			$	281,092			$	40,580			$	74,470	$	2,873	$	117,923
	Liabilities
	Foreign currency exchange forward contracts	$	—			$	64			$	—			$	64			$	—			$	112	$	—	$	112
	During the three and nine months ended September 28, 2013, there were no transfers of assets or liabilities between Level 1 and Level 2 financial assets.
	The Company’s remaining Level 3 financial assets were disposed during the first quarter of 2013. The following tables present a reconciliation of all assets and liabilities measured at fair value on a recurring basis using significant unobservable (Level 3) inputs (in thousands):
		Nine Months Ended
		December 29,				Total Net Gains				Calls						Sold						September 28,
		2012				Included in Other																2013
						Comprehensive Loss
	ARS – available-for-sale	$	2,873			$	—			$	(92	)		(1)		$	(2,781	)		(2)		$	—
		Three Months Ended
		June 30,				Total Net Gains						Calls						September 29,
		2012				Included in Other												2012
						Comprehensive Loss
	ARS – available-for-sale	$	2,796			$	83			(3)		$	—					$	2,879
		Nine Months Ended
		December 31,				Total Net Gains						Calls						September 29,
		2011				Included in Other												2012
						Comprehensive Loss
	ARS – available-for-sale	$	7,675			$	143			(3)		$	(4,939	)		(4)		$	2,879
	(1)	Amount represents the fair market value of the securities called at par value. Realized gains for the nine months ended September 28, 2013 were not significant.
	(2)	Amount represents the fair market value of the securities sold at 95% par value. Realized gains for the nine months ended September 28, 2013 were $0.2 million.
	(3)	Amount represents the change in the non-credit loss related other-than-temporary impairments (“OTTI”) recorded in Accumulated other comprehensive loss in the accompanying condensed consolidated balance sheets.
	(4)	Amount represents the fair market value of the securities called. Realized gains on these calls for the nine months ended September 29, 2012 were $0.5 million.
	Investments at fair value were as follows (in thousands):
		28-Sep-13
		Adjusted				Gross				Gross				Fair Value
		Amortized				Unrealized				Unrealized
		Cost				Gains				Losses
	Money market funds	$	72,386			$	—			$	—			$	72,386
	Certificates of deposit	2,640				—				—				2,640
	Commercial paper	88,713				13				(6		)		88,720
	Corporate bonds	109,598				36				(94		)		109,540
	U.S. treasuries	7,803				3				—				7,806
Total available-for-sale investments	$	281,140			$	52			$	(100	)		$	281,092
	December 29, 2012
	Adjusted						Gross				Gross				Fair Value
	Amortized						Unrealized				Unrealized
	Cost						Gains				Losses
Money market funds	$	25,560					$	—			$	—			$	25,560
Certificates of deposit	2,160						—				—				2,160
Commercial paper	14,848						—				(5		)		14,843
Corporate bonds	57,451						22				(6		)		57,467
U.S. treasuries	15,015						5				—				15,020
ARS	2,707				(1)		166				—				2,873
Total available-for-sale investments	$	117,741					$	193			$	(11	)		$	117,923
(1)	Amount represents the par value less $0.4 million of credit-related OTTI recognized through earnings in prior years.
As of September 28, 2013, the Company’s available-for-sale investments in certificates of deposit, commercial paper, corporate bonds, and U.S. treasuries have a contractual maturity term of no more than 18 months. Proceeds from sales, maturities and calls of available-for-sale investments were $80.0 million for the nine months ended September 28, 2013, and $102.1 million for the nine months ended September 29, 2012. Net realized gains (losses) on short-term and long-term investments were $0.2 million for the nine months ended September 28, 2013 and were $0.5 million for the nine months ended September 29, 2012. The specific identification method is used to account for gains and losses on available-for-sale investments.
Other-Than-Temporary Impairments
As a result of the Company’s disposal of $3.1 million ARS (par value) during the first quarter of 2013, it recorded an approximately $0.2 million gain, which was recognized as Other gain (loss) in the Company’s condensed consolidated statements of operations.
A roll-forward of amortized cost, cumulative OTTI recognized in earnings and Accumulated other comprehensive loss is as follows (in thousands):
	Amortized				Cumulative					Unrealized				OTTI Loss in				Accumulated
	Cost				OTTI in					Gain				Accumulated				Other
					Earnings									Other				Comprehensive
														Comprehensive				Income (Loss)
														Loss
Balance at December 29, 2012	$	2,707			$	(394	)			$	784			$	(618	)		$	166
Call on investments	(87		)		13					(25		)		20				(5		)
Investments sold	(2,620		)		381					(759		)		598				(161		)
Balance at September 28, 2013	$	—			$	—				$	—			$	—			$	—

Costmethod_Investment

Cost-method Investment	9 Months Ended
	Sep. 28, 2013
Investments, All Other Investments [Abstract]	'
Cost-method Investment	'
	Cost-method Investment
	As of September 28, 2013, the Company’s investment in a privately-held company was $9.0 million. This investment is accounted for as a cost-basis investment, as the Company owns less than 20% of the voting securities and does not have the ability to exercise significant influence over operating and financial policies of the entity. The Company’s cost-method investment is carried at historical cost in its condensed consolidated financial statements and measured at fair value on a nonrecurring basis. If the Company believes that the carrying value of the cost basis investment is in excess of estimated fair value, the Company’s policy is to record an impairment charge in Other income (expense), net in the accompanying condensed consolidated statements of operations to adjust the carrying value to estimated fair value, when the impairment is deemed other-than-temporary. The Company regularly evaluates the carrying value of this cost-method investment for impairment. As of September 28, 2013, no event had occurred that would adversely affect the carrying value of this investment, therefore, the fair value of the cost-method investment is not estimated. The Company did not record any impairment charges for this cost-method investment during the three and nine months ended September 28, 2013 and September 29, 2012.

Derivative_Instruments

Derivative Instruments	9 Months Ended
	Sep. 28, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments	'
	Derivative Instruments
	Foreign Currency Exchange Forward Contracts
	The Company enters into foreign currency exchange forward contracts to manage its exposure to fluctuations in foreign exchange rates that arise primarily from its Euro denominated receivables and Euro denominated restricted cash balance amounts that are pledged as collateral for certain stand-by and commercial letters of credit. Gains and losses on these contracts are intended to offset the impact of foreign exchange rate changes on the underlying foreign currency denominated accounts receivables and restricted cash, and therefore, do not subject the Company to material balance sheet risk. The forward contracts are with one high-quality institution and the Company consistently monitors the creditworthiness of the counterparty. None of the Company’s derivative instruments contain credit-risk related contingent features, any rights to reclaim cash collateral or any obligation to return cash collateral. The forward contracts entered into during the three and nine months ended September 28, 2013 were denominated in Euros and typically had maturities of no more than 30 days. The contracts are settled for U.S. dollars at maturity at rates agreed to at inception of the contracts.
	As of September 28, 2013, the Company did not designate foreign currency exchange forward contracts related to Euro denominated receivables and restricted cash as hedges for accounting purposes, and accordingly changes in the fair value of these instruments are included in Other gain (loss), net in the accompanying condensed consolidated statements of operations. For the three months ended September 28, 2013 and September 29, 2012, the before-tax effect of foreign currency exchange forward contracts for Euro denominated receivables and restricted cash not designated as hedging instruments was a loss of $1.2 million and a loss of $0.2 million, respectively, included in Other gain (loss), net in the condensed consolidated statements of operations. For the nine months ended September 28, 2013 and September 29, 2012, the before-tax effect of foreign currency exchange forward contracts for Euro denominated receivables and restricted cash not designated as hedging instruments was a loss of $1.4 million and a loss of $0.4 million, respectively, included in Other gain (loss), net in the condensed consolidated statement of operations.
	The fair value of derivative instruments not designated as hedging instruments in the Company’s condensed consolidated balance sheets was as follows (in thousands):
		As of September 28, 2013					As of December 29, 2012
		Gross		Other			Gross		Other
		Notional(1)		Accrued			Notional(1)		Accrued
				Liabilities					Liabilities
	Foreign currency exchange forward contracts
	Related to Euro denominated receivables	$	23,255	$	(60	)	$	22,882	$	(105	)
	Related to restricted cash	1,363		(4		)	1,495		(7		)
		$	24,618	$	(64	)	$	24,377	$	(112	)
	(1)	Represents the face amounts of forward contracts that were outstanding as of the period noted.

Balance_Sheet_Details

Balance Sheet Details	9 Months Ended
	Sep. 28, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Balance Sheet Details	'
	Balance Sheet Details
	The following table provides details of selected balance sheet items (in thousands):
		September 28,			December 29,
		2013			2012
	Inventory
	Raw materials	$	12,154		$	13,003
	Work in process	45,681			57,281
	Finished goods (1)	65,670			57,525
	Total inventory	$	123,505		$	127,809
	Property, plant and equipment, net:
	Computer hardware	$	9,362		$	9,024
	Computer software	16,728			15,834
	Laboratory and manufacturing equipment	143,680			120,543
	Furniture and fixtures	1,348			1,285
	Leasehold improvements	34,952			33,370
	Construction in progress	6,969			17,513
	Subtotal	$	213,039		$	197,569
	Less accumulated depreciation and amortization	(133,977		)	(117,226		)
	Total property, plant and equipment, net	$	79,062		$	80,343
	Accrued expenses:
	Loss contingency related to non-cancelable purchase commitments	$	3,948		$	5,401
	Professional and other consulting fees	1,969			3,703
	Taxes payable	2,642			3,588
	Royalties	999			1,516
	Accrued rebate and customer prepay liability	1,059			1,284
	Accrued interest on convertible senior notes	875			—
	Other accrued expenses	9,798			9,991
	Total accrued expenses	$	21,290		$	25,483
	(1)	Included in finished goods inventory at September 28, 2013 and December 29, 2012 were $14.0 million and $12.2 million, respectively, of inventory at customer locations for which product acceptance had not occurred.
	The following table sets forth the Company's outstanding standby letters of credit (in thousands):
		September 28,			December 29,
		2013			2012
	Value added tax license	$	1,395		$	1,536
	Customer proposal guarantee	1,353			1,373
	Property leases	699			699
	Total standby letters of credit	$	3,447		$	3,608

Comprehensive_Loss

Comprehensive Loss	9 Months Ended
	Sep. 28, 2013
Equity [Abstract]	'
Comprehensive Loss	'
	Comprehensive Loss
	Other comprehensive loss includes certain changes in equity that are excluded from net loss. The following table sets forth the changes in accumulated other comprehensive loss by component for the nine months ended September 28, 2013 (in thousands):
		Unrealized Gain			Unrealized Gain			Foreign			Accumulated			Total
		on			on Other			Currency			Tax Effect
		Auction Rate			Available-for-Sale			Translation
		Securities			Securities
	Balance at December 29, 2012	$	166		$	16		$	(1,650	)	$	(760	)	$	(2,228	)
	Other comprehensive loss before reclassifications	—			(64		)	(1,016		)	—			(1,080		)
	Amounts reclassified from accumulated other comprehensive loss	(166		)	—			—			—			(166		)
	Net current-period other comprehensive loss	(166		)	(64		)	(1,016		)	—			(1,246		)
	Balance at September 28, 2013	$	—		$	(48	)	$	(2,666	)	$	(760	)	$	(3,474	)
	The following table provides details about reclassifications out of accumulated other comprehensive loss for the nine months ended September 28, 2013 (in thousands):
	Details about Accumulated Other Comprehensive Loss Components	Amount			Affected Line Item in
		Reclassified			the Statement Where
		from			Net Loss is Presented
		Accumulated Other
		Comprehensive Loss
	Unrealized gain on auction rate securities	$	(166	)	Other gain (loss), net
		—			Provision for income taxes
	Total reclassifications for the period	$	(166	)	Total, net of income tax

Basic_and_Diluted_Net_Income_L

Basic and Diluted Net Income (Loss) Per Common Share	9 Months Ended
	Sep. 28, 2013
Earnings Per Share [Abstract]	'
Basic and Diluted Net Income (Loss) Per Common Share	'
	Basic and Diluted Net Income (Loss) Per Common Share
	Basic net income (loss) per common share is computed by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share is computed using net income (loss) and the weighted average number of common shares outstanding plus potentially dilutive common shares outstanding during the period. Potentially dilutive common shares include the assumed exercise of outstanding stock options, assumed vesting of outstanding restricted stock units (“RSUs”) and performance stock units (“PSUs”), assumed exercise of outstanding warrants, assumed conversion of convertible senior notes and assumed issuance of stock under the Company’s employee stock purchase plan (“ESPP”) using the treasury stock method. When there is a loss, these potentially diluted common shares are anti-dilutive and therefore, excluded from the diluted net loss calculation. The Company includes the common shares underlying PSUs in the calculation of diluted net income per share when they become contingently issuable and excludes such shares when they are not contingently issuable.
	The following table sets forth the computation of net income (loss) per common share – basic and diluted (in thousands, except per share amounts):
		Three Months Ended						Nine Months Ended
		September 28,			September 29,			September 28,			September 29,
		2013			2012			2013			2012
	Numerator:
	Net income (loss)	$	3,347		$	(19,081	)	$	(21,941	)	$	(69,242	)
	Denominator:
	Basic weighted average common shares outstanding	118,740			111,579			116,653			110,216
	Effect of dilutive securities:
	Employee equity plans	5,939			—			—			—
	Diluted weighted average common shares outstanding	124,679			111,579			116,653			110,216
	Net income (loss) per common share
	Basic	$	0.03		$	(0.17	)	$	(0.19	)	$	(0.63	)
	Diluted	$	0.03		$	(0.17	)	$	(0.19	)	$	(0.63	)
	The number of shares outstanding used in the computation of basic and diluted net income (loss) per share does not include the effect of the following potential outstanding common stock. The effects of these potentially outstanding shares were not included in the calculation of diluted net income (loss) per share because the effect would have been anti-dilutive or the performance condition of the award has not been met (in thousands):
		Three Months Ended					Nine Months Ended
		September 28,		September 29,			September 28,		September 29,
		2013		2012			2013		2012
	Stock options	408		9,348			6,603		9,348
	RSUs	89		6,818			6,559		6,818
	PSUs	211		1,405			721		1,405
	ESPP	675		966			675		966
	Warrants to purchase common stock	—		93			—		93
	Total	1,383		18,630			14,558		18,630
	In the three and nine months ended September 28, 2013, the Company excluded the convertible senior notes in the calculation of diluted earnings per share because the average market price was below the conversion price. The Company would include the dilutive effects of the convertible senior notes in the future if the average market price is above the conversion price. Upon conversion of the Notes, it is the Company’s intention to pay cash equal to the lesser of the aggregate principal amount and the conversion value of the Notes being converted, therefore, only the conversion spread relating to the Notes would be included in the Company’s diluted earnings per share calculation unless their effect is anti-dilutive. See Note 9, “Convertible Senior Notes,” to the Notes to Condensed Consolidated Financial Statements for more information.

Convertible_Senior_Notes

Convertible Senior Notes	9 Months Ended
	Sep. 28, 2013
Debt Disclosure [Abstract]	'
Convertible Senior Notes	'
	Convertible Senior Notes
	In May 2013, the Company issued $150.0 million of 1.75% convertible senior notes due June 1, 2018 (the “Notes”). The Notes will mature on June 1, 2018, unless earlier purchased by the Company or converted. Interest is payable semi-annually in arrears on June 1 and December 1 of each year, commencing December 1, 2013. The net proceeds to the Company were approximately $144.5 million.
	The Notes are governed by an indenture dated as of May 30, 2013 (the “Indenture”), between the Company, as issuer, and U.S. Bank National Association, as trustee. The Notes are unsecured and do not contain any financial covenants or any restrictions on the payment of dividends, the incurrence of senior debt or other indebtedness, or the issuance or repurchase of securities by the Company.
	Upon conversion, it is the Company’s intention to pay cash equal to the lesser of the aggregate principal amount and the conversion value of the Notes being converted and cash, shares of common stock or a combination of cash and shares of common stock, at the Company’s election, for any remaining conversion obligation. The initial conversion rate is 79.4834 shares of common stock per $1,000 principal amount of Notes, subject to anti-dilution adjustments. The initial conversion price is approximately $12.58 per share of common stock.
	Throughout the term of the Notes, the conversion rate may be adjusted upon the occurrence of certain events, including for any cash dividends. Holders of the Notes will not receive any cash payment representing accrued and unpaid interest upon conversion of a Note. Accrued but unpaid interest will be deemed to be paid in full upon conversion rather than cancelled, extinguished or forfeited. Holders may convert their Notes under the following circumstances:
	•	during any fiscal quarter commencing after the fiscal quarter ending on September 28, 2013 (and only during such fiscal quarter) if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price on each applicable trading day;
	•	during the five business day period after any five consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day;
	•	upon the occurrence of specified corporate events described under the Indenture, such as a consolidation, merger or binding share exchange; or
	•	at any time on or after December 1, 2017 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their Notes at any time, regardless of the foregoing circumstances.
	If the Company undergoes a fundamental change as defined in the Indenture governing the Notes, holders may require the Company to repurchase for cash all or any portion of their Notes at a repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. In addition, upon the occurrence of a “make-whole fundamental change” (as defined in the Indenture), the Company will, in certain circumstances, increase the conversion rate by a number of additional shares for a holder that elects to convert its Notes in connection with such make-whole fundamental change.
	The Notes consisted of the following (in thousands):
		Other Non-			Long-term			Additional Paid-
		Current			Debt			in Capital
		Assets
	Principal amount	$	—		$	150,000		$	—
	Debt discount	—			(45,000		)	—
	Equity component	—			—			45,000
	Debt issuance cost	3,872			—			(1,659		)
	Initial transaction amounts	$	3,872		$	105,000		$	43,341
	Amortization of debt issuance cost	(202		)	—			—
	Amortization of debt discount	—			2,350			—
	Net carrying amount at September 28, 2013	$	3,670		$	107,350		$	43,341
	In accounting for the issuance of the Notes, the Company separated the Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. The excess of the principal amount of the liability component over its carrying amount (“debt discount”) is amortized to interest expense over the term of the Notes. The remaining debt discount amount to be amortized over the remaining five years until maturity of the Notes was $42.7 million as of September 28, 2013.
	In accounting for the issuance costs of $5.5 million related to the Notes, the Company allocated the total amount incurred to the liability and equity components of the Notes based on their relative values. Issuance costs attributable to the liability component were recorded as Other non-current assets and will be amortized to interest expense over the term of the Notes. The issuance costs attributable to the equity component were netted with the equity component in stockholders’ equity. Additionally, the Company recorded a deferred tax liability of $17.0 million in connection with the Notes, along with a corresponding reduction in valuation allowance; the impact of both was recorded to stockholders’ equity.
	The Company determined that the embedded conversion option in the Notes does not require separate accounting treatment as a derivative instrument because it is both indexed to the Company’s own stock and would be classified in stockholder’s equity if freestanding.
	The following table sets forth total interest expense recognized related to the Notes (in thousands):
		Three Months Ended			Nine Months Ended
		28-Sep-13
	Contractual interest expense	$	656		$	875
	Amortization of debt issuance costs	152			202
	Amortization of debt discount	1,770			2,350
		$	2,578		$	3,427
	The effective interest rate of the liability component was 1.75%. The excess of the principal amount of the liability component over its carrying amount is amortized, using an effective interest rate of 5.12%, to interest expense over the term of the Notes.
	As of September 28, 2013, the fair value of the Notes was $173.6 million. The fair value was determined based on the quoted bid price of the Notes in an over-the-counter market on September 27, 2013. The Notes are classified as Level 2 of the fair value hierarchy. Based on the closing price of the Company’s common stock of $11.40 on September 27, 2013, the if-converted value of the Notes was less than their principal amount.

Stockholders_Equity

Stockholders' Equity	9 Months Ended
	Sep. 28, 2013
Equity [Abstract]	'
Stockholders' Equity	'
	Stockholders’ Equity
	Stock-based Compensation Plans
	The Company’s stock-based compensation plans include stock options, RSUs, PSUs and employee stock purchases under the Company’s ESPP. As of September 28, 2013, there were a total of 16.8 million shares available for grant under the Company’s 2007 Equity Incentive Plan. The following tables summarize the Company’s equity award activity and related information (in thousands, except per share data):
		Number of		Average			Aggregate
		Options		Exercise			Intrinsic
				Price			Value
				Per Share
	Outstanding at December 29, 2012	9,008		$	7.13		$	5,726
	Options exercised	(1,988	)	$	6.53		$	6,848
	Options canceled	(417	)	$	7.96
	Outstanding at September 28, 2013	6,603		$	7.26		$	27,954
	Vested and expected to vest as of September 28, 2013	6,592					$	27,916
	Exercisable at September 28, 2013	6,187		$	7.22		$	26,493
		Number of		Weighted-			Aggregate
		Restricted		Average			Intrinsic
		Stock Units		Grant Date			Value
				Fair Value
				Per Share
	Outstanding at December 29, 2012	6,703		$	8.01		$	38,873
	RSUs granted	3,258		$	7.36
	RSUs released	(2,903	)	$	8.27		$	23,389
	RSUs canceled	(499	)	$	7.67
	Outstanding at September 28, 2013	6,559		$	7.6		$	74,768
	Expected to vest at September 28, 2013	6,375					$	72,679
		Number of		Weighted-			Aggregate
		Performance		Average			Intrinsic
		Stock Units		Grant Date			Value
				Fair Value
				Per Share
	Outstanding at December 29, 2012	1,368		$	10.53		$	7,933
	PSUs granted	552		$	6.7
	PSUs released	(684	)	$	10.53		$	4,284
	PSUs canceled	(515	)	$	11.31
	Outstanding at September 28, 2013	721		$	7.04		$	8,214
	Expected to vest at September 28, 2013	490					$	5,587
	The aggregate intrinsic value of unexercised options, unreleased RSUs and unreleased PSUs is calculated as the difference between the closing price of the Company’s common stock of $11.40 at September 27, 2013 and the exercise prices of the underlying equity awards. The aggregate intrinsic value of the options which have been exercised and RSUs released is calculated as the difference between the fair market value of the common stock at the date of exercise or release and the exercise price of the underlying equity awards.
	The following table presents total stock-based compensation cost for instruments granted but not yet amortized, net of estimated forfeitures, of the Company’s equity compensation plans as of September 28, 2013. These costs are expected to be amortized on a straight-line basis over the following weighted-average periods (in thousands, except for weighted-average period):
		Unrecognized		Weighted-
		Compensation		Average Period
		Expense, Net		(in years)
	Stock options	1,420		1.02
	RSUs	32,616		2.26
	PSUs	2,183		1.7
	Employee Stock Options
	The ranges of estimated values of stock options and performance-based stock options granted, as well as ranges of assumptions used in calculating these values were based on estimates as follows:
		Three Months Ended						Nine Months Ended
	Employee and Director Stock Options	September 28,			September 29,			September 28,		September 29,
		2013			2012			2013		2012
	Volatility	N/A			N/A			N/A		65% - 68%
	Risk-free interest rate	N/A			N/A			N/A		0.7%-1.0%
	Expected life	N/A			N/A			N/A		4.0 - 5.3 years
	Estimated fair value	N/A			N/A			N/A		$3.75 - $3.76
	Stock-based compensation expense (in thousands)	$	665		$	2,553		$	2,190	$	7,121
	_________________
	N/A	Not applicable because the Company did not grant any options to employees for the periods presented.
	Employee Stock Purchase Plan
	The fair value of the ESPP shares was estimated at the date of grant using the following assumptions:
		Three Months Ended						Nine Months Ended
	Employee Stock Purchase Plan	September 28,			September 29,			September 28,		September 29,
		2013			2012			2013		2012
	Volatility	49%			54%			46% - 49%		54% - 57%
	Risk-free interest rate	0.10%			0.17%			0.10% - 0.14%		0.16% - 0.17%
	Expected life	0.5 years			0.5 years			0.5 years		0.5 years
Estimated fair value	$	3		$	1.73		$1.87 - $3.00		$1.73 - $2.63
Stock-based compensation expense (in thousands)	$	777		$	895		$	2,050	$	2,653
Restricted Stock Units
During the three and nine months ended September 28, 2013, the Company granted RSUs to members of the Company’s board of directors and employees to receive an aggregate of 0.4 million shares and 3.3 million shares of the Company’s common stock, respectively, at no cost. The Company accounted for the fair value of the RSUs using the closing market price of the Company’s common stock on the date of grant. Amortization of stock-based compensation related to RSUs in the three and nine months ended September 28, 2013 and September 29, 2012 was approximately $5.5 million and $18.2 million, respectively, and $6.9 million and $20.6 million, respectively.
Performance Stock Units
Pursuant to the Company’s 2007 Equity Incentive Plan, during 2009, the Company granted PSUs primarily to members of the Company’s board of directors and executive officers. The number of shares to be issued upon vesting of PSUs range from 0.5 to 2.0 times the number of PSUs granted depending on the relative performance of the Company’s common stock price compared to the NASDAQ Composite Index over a three-year or four-year period. During the nine months ended September 28, 2013, the Company released 0.5 million shares of PSUs based on a payout of 0.5 times of the target number of PSUs.
Pursuant to the Company’s 2007 Equity Incentive Plan, during 2012, the Company granted 0.5 million shares of PSUs to certain of the Company’s executive officers. These PSUs will only vest upon the achievement of certain specific revenue and operating profit criteria and are subject to each named executive officer’s continued service to the Company. If the financial performance metrics are not met within the time limits specified in the award agreements, the PSUs will be canceled. During the nine months ended September 28, 2013, the Company released 0.2 million shares of PSUs upon achievement of certain performance goals.
Pursuant to the Company’s 2007 Equity Incentive Plan, during the three and nine months ended September 29, 2013, the Company granted zero and 0.6 million shares of PSUs, respectively, to certain of the Company’s executive officers. The number of shares to be issued upon vesting of PSUs range from 0 to 1.5 times the number of PSUs granted depending on the relative performance of the Company’s common stock price compared to the NASDAQ Telecom Composite Index over the span of one, two and three years of total shareholder returns.
Amortization of stock-based compensation related to PSUs in the three months ended September 28, 2013 was approximately $0.5 million. Amortization of stock-based compensation related to PSUs in the nine months ended September 28, 2013 was approximately $0.1 million, including $1.5 million of expense offset by a $1.4 million decrease in fair value for one award classified as a liability award, in accordance with Accounting Standard Codification 718, Compensation – Stock Compensation. Amortization of stock-based compensation related to PSUs in the three and nine months ended September 28, 2012 was approximately $1.0 million and $2.8 million, respectively.
Common Stock Warrants
During the first quarter of 2013, warrants to purchase 92,592 shares of common stock were net exercised. The aggregate consideration for such exercises was approximately $0.5 million. As of September 28, 2013, there were no warrants of common stock outstanding.
Stock-Based Compensation
The following tables summarize the effects of stock-based compensation on the Company’s condensed consolidated balance sheets and statements of operations for the periods presented (in thousands):
	September 28,			December 29,
	2013			2012
Stock-based compensation effects in inventory	$	3,656		$	4,891
Stock-based compensation effects in deferred inventory cost	$	16		$	42
Stock-based compensation effects in fixed assets	$	152		$	171
	Three Months Ended						Nine Months Ended
	September 28,			September 29,			September 28,		September 29,
	2013			2012			2013		2012
Stock-based compensation effects in net income (loss) before income taxes
Cost of revenue	$	422		$	683		$	1,382	$	1,975
Research and development	2,434			3,439			8,175		10,454
Sales and marketing	1,853			2,685			5,659		7,648
General and administration	1,807			2,804			4,167		7,732
	6,516			9,611			19,383		27,809
Cost of revenue – amortization from balance sheet (1)	1,127			1,706			4,419		3,875
Total stock-based compensation expense	$	7,643		$	11,317		$	23,802	$	31,684
_________________
(1)	Stock-based compensation expense deferred to inventory and deferred inventory costs in prior periods and recognized in the current period.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 28, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	Provision for income taxes for the three and nine months ended September 28, 2013 was $0.3 million and $1.2 million, respectively, or 8.4% and negative 6.0%, respectively, on a pre-tax income of $3.7 million and a pre-tax loss of $20.7 million, respectively. This compared to a tax provision of $0.4 million and $1.5 million, respectively, or negative 2.3% and negative 2.3%, respectively, on a pre-tax loss of $18.6 million and $67.7 million, respectively, for the three and nine months ended September 29, 2012. The difference between the Company’s effective tax rates and the federal statutory rate of 35% is primarily attributable to unbenefited U.S. losses, foreign taxes provided on the income of the Company’s foreign subsidiaries, non-deductible stock-based compensation expense, and various discrete items. The lower tax expense in 2013 relates to a release of transfer pricing reserves following a statute of limitations expiration.
	The realization of tax benefits of deferred tax assets is dependent upon future levels of taxable income, of an appropriate character, in the periods the items are scheduled to be deductible or taxable. Based on the available objective evidence, management believes it is more likely than not that the domestic net deferred tax assets will not be realizable. Accordingly, the Company has provided a full valuation allowance against its domestic deferred tax assets, net of deferred tax liabilities, as of September 28, 2013 and December 29, 2012. In determining future taxable income, the Company makes assumptions to forecast federal, state and international operating income, the reversal of taxable temporary differences, and the implementation of any feasible and prudent tax planning strategies. The assumptions require significant judgment regarding the forecasts of future taxable income and are consistent with the Company’s forecasts used to manage its business. The Company intends to maintain the remaining valuation allowance until sufficient positive evidence exists to support a reversal of, or decrease, in the valuation allowance.

Segment_Information

Segment Information	9 Months Ended
	Sep. 28, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	Segment Information
	Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or decision making group, in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is the Company’s chief executive officer. The Company’s chief executive officer reviews financial information presented on a consolidated basis, accompanied by information about revenue by geographic region for purposes of allocating resources and evaluating financial performance. The Company has one business activity, and there are no segment managers who are held accountable for operations, operating results and plans for levels or components below the consolidated unit level. Accordingly, the Company is considered to be in a single reporting segment and operating unit structure.
	Revenue by geographic region is based on the shipping address of the customer. The following tables set forth revenue and long-lived assets by geographic region (in thousands):
	Revenue
		Three Months Ended				Nine Months Ended
		September 28,		September 29,		September 28,		September 29,
		2013		2012		2013		2012
	Americas:
	United States	$	103,113	$	79,094	$	270,437	$	215,782
	Other Americas	2,024		3,716		6,544		9,223
		105,137		82,810		276,981		225,005
	Europe, Middle East and Africa	32,262		27,515		103,022		76,944
	Asia Pacific	4,621		1,889		25,027		8,424
	Total revenue	$	142,020	$	112,214	$	405,030	$	310,373
	Property, plant and equipment, net
		September 28,		December 29,
		2013		2012
	United States	$	76,271	$	78,309
	Other Americas	364		198
	Europe, Middle East and Africa	995		24
	Asia Pacific	1,432		1,812
	Total property, plant and equipment, net	$	79,062	$	80,343

Guarantees

Guarantees	9 Months Ended
	Sep. 28, 2013
Guarantees [Abstract]	'
Guarantees	'
	Guarantees
	Product Warranties
	Upon delivery of products, the Company provides for the estimated cost to repair or replace products or the related components that may be returned under hardware warranties. In general, hardware warranty periods range from one to five years. Hardware warranties provide the purchaser with protection in the event that the product does not perform to product specifications. During the warranty period, the purchaser’s sole and exclusive remedy in the event of such defect or failure to perform is limited to the correction of the defect or failure by repair, refurbishment or replacement, at the Company’s sole option and expense. The Company estimates its hardware warranty obligations based on the Company’s historical experience of known product failure rates, use of materials to repair or replace defective products, and service delivery costs incurred in correcting product failures. In addition, from time to time, specific hardware warranty accruals may be made if unforeseen technical problems arise with specific products. Management periodically assesses the adequacy of the Company’s recorded warranty liabilities and adjusts the amounts as necessary.
	Activity related to product warranty was as follows (in thousands):
		Three Months Ended						Nine Months Ended
		September 28,			September 29,			September 28,			September 29,
		2013			2012			2013			2012
	Beginning balance	$	19,701		$	13,702		$	16,482		$	12,865
	Charges to operations	5,220			4,241			16,646			10,065
	Utilization	(2,645		)	(1,684		)	(6,783		)	(5,488		)
	Change in estimate (1)	886			(960		)	(3,183		)	(2,143		)
	Balance at the end of the period	$	23,162		$	15,299		$	23,162		$	15,299
	(1)	The Company records hardware warranty liabilities based on the latest quality and cost information available as of that date. The changes in estimate shown here are due to changes in overall actual failure rates and the impact of these changes on the Company’s estimate of expected future returns and changes in the estimated cost of replacing failed units using either repaired or new units.

Litigation_and_Contingencies

Litigation and Contingencies	9 Months Ended
	Sep. 28, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Litigation and Contingencies	'
	Litigation and Contingencies
	Legal Matters
	From time to time, the Company is subject to various legal proceedings, claims and litigation arising in the ordinary course of business. While the outcome of these matters is currently not determinable, the Company does not expect that the ultimate costs to resolve these matters will have a material effect on its consolidated financial position, results of operations, or cash flows. A complete description of the Company’s legal proceedings can be found in “Item 3. Legal Proceedings” of Part I of the Company’s Annual Report on Form 10-K for the fiscal year ended December 29, 2012 filed with the SEC on March 5, 2013. Any updates to the information contained in the Company’s Annual Report on Form 10-K are set forth below.
	Cheetah Patent Infringement Litigation
	A hearing was held on July 16, 2013, during which the parties presented evidence to the U.S. District Court for the Eastern District of Texas Texarkana Division regarding the interpretation of various claim terms of U.S. patent nos. 6,795,605 and  7,142,347. On July 24, 2013, the Court issued an order regarding claim construction, in which the Court agreed with some of the Company’s proposed claim constructions.
	In addition to the ongoing Cheetah litigation, on June 10, 2013, the Company filed a Petition for Inter Partes Review to challenge the validity of Cheetah’s U.S. patent no. 6,888,661 (the “‘661 Patent”) in a separate proceeding before the United States Patent and Trademark Office. Cheetah has sued Finisar Corporation for infringement of the ‘661 Patent in the U.S. District Court for the Eastern District of Michigan.
	Based on the information available at this time, the Company concluded that the likelihood of a loss with respect to the Cheetah litigation is probable and reasonably estimable. Accordingly, the Company accrued an insignificant amount during the third quarter of 2013 which did not have a material adverse effect on the Company’s business, consolidated financial position, results of operations, or cash flows. Factors that the Company considered in the determination of the likelihood of a loss and the estimate that loss in respect to this matter included the merits of the case, the nature of the litigation (including the complex and technical nature of patent litigation), the length of time the matter has been pending, the lift of the stay by the court, the status of the plaintiff as a non-operating entity and the likelihood of the plaintiff accepting the estimated amount. However, the outcome of such legal matters is inherently unpredictable and subject to significant uncertainties.
	Cambrian Science Patent Infringement Litigation
	On June 17, 2013, the U.S. District Court for the Central District of California issued an order regarding claim construction, in which the Court agreed with some of the Company’s proposed claim constructions.
	Based on the information available at this time, the Company concluded that the likelihood of a loss with respect to this suit is less than reasonably possible and therefore, a range of loss cannot be provided. As a result, the Company has made no provision for this lawsuit in its financial statements. Factors that the Company considered in the determination of the likelihood of a loss in respect to this matter included the merits of the case, the nature of the litigation (including the complex and technical nature of patent litigation), the length of time the matter has been pending, and the status of the plaintiff as a non-operating entity, and the Company’s intention to vigorously defend this case.
	Loss Contingencies
	The Company is subject to the possibility of various losses arising in the ordinary course of business. These may relate to disputes, litigation and other legal actions. In the preparation of its quarterly and annual financial statements, the Company considers the likelihood of loss or the incurrence of a liability, including whether it is probable, reasonably possible or remote that a liability has been incurred, as well as the Company’s ability to reasonably estimate the amount of loss, in determining loss contingencies. In accordance with U.S. GAAP, an estimated loss contingency is accrued when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. The Company regularly evaluates current information to determine whether any accruals should be adjusted and whether new accruals are required. As of September 28, 2013, the Company has not accrued or recorded any such material liabilities.

Recent_Accounting_Pronouncemen1

Recent Accounting Pronouncements Recent Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 28, 2013
Accounting Changes and Error Corrections [Abstract]	'
Comprehensive income	'
	In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2013-02, Comprehensive Income (Topic 220) – Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”). ASU 2013-02 requires an entity to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income if the amount being reclassified is required under U.S. GAAP to be reclassified in its entirety to net income. For other amounts that are not required under U.S GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP that provide additional detail about those amounts. The Company adopted the guidance for ASU 2013-02 beginning in its fiscal quarter ended March 30, 2013. Other than requiring additional disclosures, the Company’s adoption of ASU 2013-02 did not have an impact on the Company’s financial position, results of operations or cash flow.
Income tax	'
	In July 2013, the FASB issued Accounting Standards Update 2013-11, Income Taxes – Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carry forward, a Similar Tax Loss, or a Tax Credit Carry forwards Exists (“ASU 2013-11”). ASU 2013-11 requires entities to present the unrecognized tax benefits in the financial statements as a liability and not combine it with deferred tax assets to the extent a net operating loss carry-forward, a similar tax loss, or a tax credit carry-forward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose. The assessment of whether a deferred tax asset is available is based on the unrecognized tax benefit and deferred tax asset that exist at the reporting date and should be made presuming disallowance of the tax position at the reporting date. ASU 2013-11 is effective for annual and interim periods for fiscal years beginning on or after December 15, 2013. The Company is currently evaluating ASU 2013-11 and does not expect its adoption to have an impact on the Company’s financial position, results of operations or cash flow.

Fair_Value_Measurements_and_Ot1

Fair Value Measurements and Other-Than-Temporary Impairments (Tables)	9 Months Ended
	Sep. 28, 2013
Text Block [Abstract]	'
Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The following tables represent the Company’s fair value hierarchy for its assets and liabilities measured at fair value on a recurring basis (in thousands):
		As of September 28, 2013															As of December 29, 2012
		Fair Value Measured Using															Fair Value Measured Using
		Level 1			Level 2				Level 3				Total				Level 1				Level 2		Level 3		Total
	Assets
	Money market funds	$	72,386		$	—			$	—			$	72,386			$	25,560			$	—	$	—	$	25,560
	Certificates of deposit	—			2,640				—				2,640				—				2,160		—		2,160
	Commercial paper	—			88,720				—				88,720				—				14,843		—		14,843
	Corporate bonds	—			109,540				—				109,540				—				57,467		—		57,467
	U.S. treasuries	7,806			—				—				7,806				15,020				—		—		15,020
	ARS	—			—				—				—				—				—		2,873		2,873
	Total assets	$	80,192		$	200,900			$	—			$	281,092			$	40,580			$	74,470	$	2,873	$	117,923
	Liabilities
	Foreign currency exchange forward contracts	$	—		$	64			$	—			$	64			$	—			$	112	$	—	$	112
Reconciliation of All Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The following tables present a reconciliation of all assets and liabilities measured at fair value on a recurring basis using significant unobservable (Level 3) inputs (in thousands):
		Nine Months Ended
		December 29,			Total Net Gains				Calls						Sold						September 28,
		2012			Included in Other																2013
					Comprehensive Loss
	ARS – available-for-sale	$	2,873		$	—			$	(92	)		(1)		$	(2,781	)		(2)		$	—
		Three Months Ended
		June 30,			Total Net Gains						Calls						September 29,
		2012			Included in Other												2012
					Comprehensive Loss
	ARS – available-for-sale	$	2,796		$	83			(3)		$	—					$	2,879
		Nine Months Ended
		December 31,			Total Net Gains						Calls						September 29,
		2011			Included in Other												2012
					Comprehensive Loss
	ARS – available-for-sale	$	7,675		$	143			(3)		$	(4,939	)		(4)		$	2,879
	(1)	Amount represents the fair market value of the securities called at par value. Realized gains for the nine months ended September 28, 2013 were not significant.
	(2)	Amount represents the fair market value of the securities sold at 95% par value. Realized gains for the nine months ended September 28, 2013 were $0.2 million.
	(3)	Amount represents the change in the non-credit loss related other-than-temporary impairments (“OTTI”) recorded in Accumulated other comprehensive loss in the accompanying condensed consolidated balance sheets.
	(4)	Amount represents the fair market value of the securities called. Realized gains on these calls for the nine months ended September 29, 2012 were $0.5 million.
Investments at Fair Value	'
	Investments at fair value were as follows (in thousands):
		28-Sep-13
		Adjusted			Gross				Gross				Fair Value
		Amortized			Unrealized				Unrealized
		Cost			Gains				Losses
	Money market funds	$	72,386		$	—			$	—			$	72,386
	Certificates of deposit	2,640			—				—				2,640
	Commercial paper	88,713			13				(6		)		88,720
	Corporate bonds	109,598			36				(94		)		109,540
	U.S. treasuries	7,803			3				—				7,806
	Total available-for-sale investments	$	281,140		$	52			$	(100	)		$	281,092
		December 29, 2012
		Adjusted					Gross				Gross				Fair Value
		Amortized					Unrealized				Unrealized
		Cost					Gains				Losses
	Money market funds	$	25,560				$	—			$	—			$	25,560
	Certificates of deposit	2,160					—				—				2,160
	Commercial paper	14,848					—				(5		)		14,843
	Corporate bonds	57,451					22				(6		)		57,467
	U.S. treasuries	15,015					5				—				15,020
	ARS	2,707			(1)		166				—				2,873
	Total available-for-sale investments	$	117,741				$	193			$	(11	)		$	117,923
	(1)	Amount represents the par value less $0.4 million of credit-related OTTI recognized through earnings in prior years.
Roll-Forward of Amortized Cost, Cumulative OTTI Recognized in Earnings and Accumulated Other Comprehensive Loss	'
	A roll-forward of amortized cost, cumulative OTTI recognized in earnings and Accumulated other comprehensive loss is as follows (in thousands):
		Amortized			Cumulative					Unrealized				OTTI Loss in				Accumulated
		Cost			OTTI in					Gain				Accumulated				Other
					Earnings									Other				Comprehensive
														Comprehensive				Income (Loss)
														Loss
	Balance at December 29, 2012	$	2,707		$	(394	)			$	784			$	(618	)		$	166
	Call on investments	(87		)	13					(25		)		20				(5		)
	Investments sold	(2,620		)	381					(759		)		598				(161		)
	Balance at September 28, 2013	$	—		$	—				$	—			$	—			$	—

Derivative_Instruments_Tables

Derivative Instruments (Tables)	9 Months Ended
	Sep. 28, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Fair Value of Derivative Instruments not Designated as Hedging Instruments	'
	The fair value of derivative instruments not designated as hedging instruments in the Company’s condensed consolidated balance sheets was as follows (in thousands):
		As of September 28, 2013					As of December 29, 2012
		Gross		Other			Gross		Other
		Notional(1)		Accrued			Notional(1)		Accrued
				Liabilities					Liabilities
	Foreign currency exchange forward contracts
	Related to Euro denominated receivables	$	23,255	$	(60	)	$	22,882	$	(105	)
	Related to restricted cash	1,363		(4		)	1,495		(7		)
		$	24,618	$	(64	)	$	24,377	$	(112	)
	(1)	Represents the face amounts of forward contracts that were outstanding as of the period noted.

Balance_Sheet_Details_Tables

Balance Sheet Details (Tables)	9 Months Ended
	Sep. 28, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Details of Selected Balance Sheet Items	'
	The following table provides details of selected balance sheet items (in thousands):
		September 28,			December 29,
		2013			2012
	Inventory
	Raw materials	$	12,154		$	13,003
	Work in process	45,681			57,281
	Finished goods (1)	65,670			57,525
	Total inventory	$	123,505		$	127,809
	Property, plant and equipment, net:
	Computer hardware	$	9,362		$	9,024
	Computer software	16,728			15,834
	Laboratory and manufacturing equipment	143,680			120,543
	Furniture and fixtures	1,348			1,285
	Leasehold improvements	34,952			33,370
	Construction in progress	6,969			17,513
	Subtotal	$	213,039		$	197,569
	Less accumulated depreciation and amortization	(133,977		)	(117,226		)
	Total property, plant and equipment, net	$	79,062		$	80,343
	Accrued expenses:
	Loss contingency related to non-cancelable purchase commitments	$	3,948		$	5,401
	Professional and other consulting fees	1,969			3,703
	Taxes payable	2,642			3,588
	Royalties	999			1,516
	Accrued rebate and customer prepay liability	1,059			1,284
	Accrued interest on convertible senior notes	875			—
	Other accrued expenses	9,798			9,991
	Total accrued expenses	$	21,290		$	25,483
	(1)	Included in finished goods inventory at September 28, 2013 and December 29, 2012 were $14.0 million and $12.2 million, respectively, of inventory at customer locations for which product acceptance had not occurred.
Schedule of Components of Letters of Credit	'
	The following table sets forth the Company's outstanding standby letters of credit (in thousands):
		September 28,			December 29,
		2013			2012
	Value added tax license	$	1,395		$	1,536
	Customer proposal guarantee	1,353			1,373
	Property leases	699			699
	Total standby letters of credit	$	3,447		$	3,608

Comprehensive_Loss_Tables

Comprehensive Loss (Tables)	9 Months Ended
	Sep. 28, 2013
Equity [Abstract]	'
Summary of Changes in Accumulated Other Comprehensive Loss	'
	Other comprehensive loss includes certain changes in equity that are excluded from net loss. The following table sets forth the changes in accumulated other comprehensive loss by component for the nine months ended September 28, 2013 (in thousands):
		Unrealized Gain			Unrealized Gain			Foreign			Accumulated			Total
		on			on Other			Currency			Tax Effect
		Auction Rate			Available-for-Sale			Translation
		Securities			Securities
	Balance at December 29, 2012	$	166		$	16		$	(1,650	)	$	(760	)	$	(2,228	)
	Other comprehensive loss before reclassifications	—			(64		)	(1,016		)	—			(1,080		)
	Amounts reclassified from accumulated other comprehensive loss	(166		)	—			—			—			(166		)
	Net current-period other comprehensive loss	(166		)	(64		)	(1,016		)	—			(1,246		)
	Balance at September 28, 2013	$	—		$	(48	)	$	(2,666	)	$	(760	)	$	(3,474	)
Components of Reclassifications of Accumulated Other Comprehensive Loss	'
	The following table provides details about reclassifications out of accumulated other comprehensive loss for the nine months ended September 28, 2013 (in thousands):
	Details about Accumulated Other Comprehensive Loss Components	Amount			Affected Line Item in
		Reclassified			the Statement Where
		from			Net Loss is Presented
		Accumulated Other
		Comprehensive Loss
	Unrealized gain on auction rate securities	$	(166	)	Other gain (loss), net
		—			Provision for income taxes
	Total reclassifications for the period	$	(166	)	Total, net of income tax

Basic_and_Diluted_Net_Income_L1

Basic and Diluted Net Income (Loss) Per Common Share (Tables)	9 Months Ended
	Sep. 28, 2013
Earnings Per Share [Abstract]	'
Computation of Net Loss Per Common Share Basic and Diluted	'
	The following table sets forth the computation of net income (loss) per common share – basic and diluted (in thousands, except per share amounts):
		Three Months Ended						Nine Months Ended
		September 28,			September 29,			September 28,			September 29,
		2013			2012			2013			2012
	Numerator:
	Net income (loss)	$	3,347		$	(19,081	)	$	(21,941	)	$	(69,242	)
	Denominator:
	Basic weighted average common shares outstanding	118,740			111,579			116,653			110,216
	Effect of dilutive securities:
	Employee equity plans	5,939			—			—			—
	Diluted weighted average common shares outstanding	124,679			111,579			116,653			110,216
	Net income (loss) per common share
	Basic	$	0.03		$	(0.17	)	$	(0.19	)	$	(0.63	)
	Diluted	$	0.03		$	(0.17	)	$	(0.19	)	$	(0.63	)
Antidilutive Shares Excluded from Computation of Diluted Net Loss Per Share	'
	The number of shares outstanding used in the computation of basic and diluted net income (loss) per share does not include the effect of the following potential outstanding common stock. The effects of these potentially outstanding shares were not included in the calculation of diluted net income (loss) per share because the effect would have been anti-dilutive or the performance condition of the award has not been met (in thousands):
		Three Months Ended					Nine Months Ended
		September 28,		September 29,			September 28,		September 29,
		2013		2012			2013		2012
	Stock options	408		9,348			6,603		9,348
	RSUs	89		6,818			6,559		6,818
	PSUs	211		1,405			721		1,405
	ESPP	675		966			675		966
	Warrants to purchase common stock	—		93			—		93
	Total	1,383		18,630			14,558		18,630
	In the three and nine months ended September 28, 2013, the Company excluded the convertible senior notes in the calculation of diluted earnings per share because the average market price was below the conversion price. The Company would include the dilutive effects of the convertible senior notes in the future if the average market price is above the conversion price. Upon conversion of the Notes, it is the Company’s intention to pay cash equal to the lesser of the aggregate principal amount and the conversion value of the Notes being converted, therefore, only the conversion spread relating to the Notes would be included in the Company’s diluted earnings per share calculation unless their effect is anti-dilutive. See Note 9, “Convertible Senior Notes,” to the Notes to Condensed Consolidated Financial Statements for more information.

Convertible_Senior_Notes_Table

Convertible Senior Notes (Tables)	9 Months Ended
	Sep. 28, 2013
Debt Disclosure [Abstract]	'
Components of Convertible Senior Notes	'
	The Notes consisted of the following (in thousands):
		Other Non-			Long-term			Additional Paid-
		Current			Debt			in Capital
		Assets
	Principal amount	$	—		$	150,000		$	—
	Debt discount	—			(45,000		)	—
	Equity component	—			—			45,000
	Debt issuance cost	3,872			—			(1,659		)
	Initial transaction amounts	$	3,872		$	105,000		$	43,341
	Amortization of debt issuance cost	(202		)	—			—
	Amortization of debt discount	—			2,350			—
	Net carrying amount at September 28, 2013	$	3,670		$	107,350		$	43,341
Interest Expense Recognized Related to Notes	'
	The following table sets forth total interest expense recognized related to the Notes (in thousands):
		Three Months Ended			Nine Months Ended
		28-Sep-13
	Contractual interest expense	$	656		$	875
	Amortization of debt issuance costs	152			202
	Amortization of debt discount	1,770			2,350
		$	2,578		$	3,427

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 28, 2013
Equity [Abstract]	'
Summary of Company's Equity Award Activity - Options	'
	The following tables summarize the Company’s equity award activity and related information (in thousands, except per share data):
		Number of		Average			Aggregate
		Options		Exercise			Intrinsic
				Price			Value
				Per Share
	Outstanding at December 29, 2012	9,008		$	7.13		$	5,726
	Options exercised	(1,988	)	$	6.53		$	6,848
	Options canceled	(417	)	$	7.96
	Outstanding at September 28, 2013	6,603		$	7.26		$	27,954
	Vested and expected to vest as of September 28, 2013	6,592					$	27,916
	Exercisable at September 28, 2013	6,187		$	7.22		$	26,493
Summary of Company's Equity Award Activity - RSUs	'
		Number of		Weighted-			Aggregate
		Restricted		Average			Intrinsic
		Stock Units		Grant Date			Value
				Fair Value
				Per Share
	Outstanding at December 29, 2012	6,703		$	8.01		$	38,873
	RSUs granted	3,258		$	7.36
	RSUs released	(2,903	)	$	8.27		$	23,389
	RSUs canceled	(499	)	$	7.67
	Outstanding at September 28, 2013	6,559		$	7.6		$	74,768
	Expected to vest at September 28, 2013	6,375					$	72,679
Summary of Company's Equity Award Activity - PSUs	'
		Number of		Weighted-			Aggregate
		Performance		Average			Intrinsic
		Stock Units		Grant Date			Value
				Fair Value
				Per Share
	Outstanding at December 29, 2012	1,368		$	10.53		$	7,933
	PSUs granted	552		$	6.7
	PSUs released	(684	)	$	10.53		$	4,284
	PSUs canceled	(515	)	$	11.31
	Outstanding at September 28, 2013	721		$	7.04		$	8,214
	Expected to vest at September 28, 2013	490					$	5,587
Total Stock Based Compensation Cost for Instruments Granted but Not Yet Amortized	'
	The following table presents total stock-based compensation cost for instruments granted but not yet amortized, net of estimated forfeitures, of the Company’s equity compensation plans as of September 28, 2013. These costs are expected to be amortized on a straight-line basis over the following weighted-average periods (in thousands, except for weighted-average period):
		Unrecognized		Weighted-
		Compensation		Average Period
		Expense, Net		(in years)
	Stock options	1,420		1.02
	RSUs	32,616		2.26
	PSUs	2,183		1.7
Ranges of Estimated Values of Stock Options and Performance-Based Stock Options Granted	'
	The ranges of estimated values of stock options and performance-based stock options granted, as well as ranges of assumptions used in calculating these values were based on estimates as follows:
		Three Months Ended						Nine Months Ended
	Employee and Director Stock Options	September 28,			September 29,			September 28,		September 29,
		2013			2012			2013		2012
	Volatility	N/A			N/A			N/A		65% - 68%
	Risk-free interest rate	N/A			N/A			N/A		0.7%-1.0%
	Expected life	N/A			N/A			N/A		4.0 - 5.3 years
	Estimated fair value	N/A			N/A			N/A		$3.75 - $3.76
	Stock-based compensation expense (in thousands)	$	665		$	2,553		$	2,190	$	7,121
	_________________
	N/A	Not applicable because the Company did not grant any options to employees for the periods presented.
Estimated Fair Value of ESPP Shares	'
	The fair value of the ESPP shares was estimated at the date of grant using the following assumptions:
		Three Months Ended						Nine Months Ended
	Employee Stock Purchase Plan	September 28,			September 29,			September 28,		September 29,
		2013			2012			2013		2012
	Volatility	49%			54%			46% - 49%		54% - 57%
	Risk-free interest rate	0.10%			0.17%			0.10% - 0.14%		0.16% - 0.17%
	Expected life	0.5 years			0.5 years			0.5 years		0.5 years
	Estimated fair value	$	3		$	1.73		$1.87 - $3.00		$1.73 - $2.63
	Stock-based compensation expense (in thousands)	$	777		$	895		$	2,050	$	2,653
Summary of Effects of Stock-Based Compensation on Company's Balance Sheets and Statements of Operations	'
	The following tables summarize the effects of stock-based compensation on the Company’s condensed consolidated balance sheets and statements of operations for the periods presented (in thousands):
		September 28,			December 29,
		2013			2012
	Stock-based compensation effects in inventory	$	3,656		$	4,891
	Stock-based compensation effects in deferred inventory cost	$	16		$	42
	Stock-based compensation effects in fixed assets	$	152		$	171
		Three Months Ended						Nine Months Ended
		September 28,			September 29,			September 28,		September 29,
		2013			2012			2013		2012
	Stock-based compensation effects in net income (loss) before income taxes
	Cost of revenue	$	422		$	683		$	1,382	$	1,975
	Research and development	2,434			3,439			8,175		10,454
	Sales and marketing	1,853			2,685			5,659		7,648
	General and administration	1,807			2,804			4,167		7,732
		6,516			9,611			19,383		27,809
	Cost of revenue – amortization from balance sheet (1)	1,127			1,706			4,419		3,875
	Total stock-based compensation expense	$	7,643		$	11,317		$	23,802	$	31,684
	_________________
	(1)	Stock-based compensation expense deferred to inventory and deferred inventory costs in prior periods and recognized in the current period.

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Sep. 28, 2013
Segment Reporting [Abstract]	'
Revenue and Long-Lived Assets by Geographic Region	'
	Revenue by geographic region is based on the shipping address of the customer. The following tables set forth revenue and long-lived assets by geographic region (in thousands):
	Revenue
		Three Months Ended				Nine Months Ended
		September 28,		September 29,		September 28,		September 29,
		2013		2012		2013		2012
	Americas:
	United States	$	103,113	$	79,094	$	270,437	$	215,782
	Other Americas	2,024		3,716		6,544		9,223
		105,137		82,810		276,981		225,005
	Europe, Middle East and Africa	32,262		27,515		103,022		76,944
	Asia Pacific	4,621		1,889		25,027		8,424
	Total revenue	$	142,020	$	112,214	$	405,030	$	310,373
Property, Plant and Equipment, Net	'
	Property, plant and equipment, net
		September 28,		December 29,
		2013		2012
	United States	$	76,271	$	78,309
	Other Americas	364		198
	Europe, Middle East and Africa	995		24
	Asia Pacific	1,432		1,812
	Total property, plant and equipment, net	$	79,062	$	80,343

Guarantees_Tables

Guarantees (Tables)	9 Months Ended
	Sep. 28, 2013
Guarantees [Abstract]	'
Activity Related to Product Warranty	'
	Activity related to product warranty was as follows (in thousands):
		Three Months Ended						Nine Months Ended
		September 28,			September 29,			September 28,			September 29,
		2013			2012			2013			2012
	Beginning balance	$	19,701		$	13,702		$	16,482		$	12,865
	Charges to operations	5,220			4,241			16,646			10,065
	Utilization	(2,645		)	(1,684		)	(6,783		)	(5,488		)
	Change in estimate (1)	886			(960		)	(3,183		)	(2,143		)
	Balance at the end of the period	$	23,162		$	15,299		$	23,162		$	15,299
	(1)	The Company records hardware warranty liabilities based on the latest quality and cost information available as of that date. The changes in estimate shown here are due to changes in overall actual failure rates and the impact of these changes on the Company’s estimate of expected future returns and changes in the estimated cost of replacing failed units using either repaired or new units.

Fair_Value_Measurements_and_Ot2

Fair Value Measurements and Other-Than-Temporary Impairments - Additional Information (Details) (USD $)	3 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Mar. 30, 2013	Sep. 28, 2013	Sep. 29, 2012
Receivables [Abstract]	'	'	'
Disposal of ARS (par value)	$3.10	'	'
Available-for-sale auction rate securities called at par value	0.1	'	'
Tender price	3	'	'
Percent of par value at tender price	95.00%	95.00%	'
Available-for-sale investments	'	'18 months	'
Proceeds from sales, maturities and calls of available-for-sale investments	'	80	102.1
Realized gains on these calls	$0.20	$0.20	$0.50

Fair_Value_Measurements_and_Ot3

Fair Value Measurements and Other-Than-Temporary Impairments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (Fair Value, Measurements, Recurring [Member], USD $)	Sep. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Assets	'	'
Total Assets	$281,092	$117,923
Money Market Funds [Member]	'	'
Assets	'	'
Total Assets	72,386	25,560
Certificates of Deposit [Member]	'	'
Assets	'	'
Total Assets	2,640	2,160
Commercial Paper [Member]	'	'
Assets	'	'
Total Assets	88,720	14,843
Corporate Bonds [Member]	'	'
Assets	'	'
Total Assets	109,540	57,467
U.S. Treasuries [Member]	'	'
Assets	'	'
Total Assets	7,806	15,020
ARS [Member]	'	'
Assets	'	'
Total Assets	0	2,873
Foreign Currency Exchange Forward Contracts [Member]	'	'
Liabilities	'	'
Total Liabilities	64	112
Level 1 [Member]	'	'
Assets	'	'
Total Assets	80,192	40,580
Level 1 [Member] | Money Market Funds [Member]	'	'
Assets	'	'
Total Assets	72,386	25,560
Level 1 [Member] | Certificates of Deposit [Member]	'	'
Assets	'	'
Total Assets	0	0
Level 1 [Member] | Commercial Paper [Member]	'	'
Assets	'	'
Total Assets	0	0
Level 1 [Member] | Corporate Bonds [Member]	'	'
Assets	'	'
Total Assets	0	0
Level 1 [Member] | U.S. Treasuries [Member]	'	'
Assets	'	'
Total Assets	7,806	15,020
Level 1 [Member] | ARS [Member]	'	'
Assets	'	'
Total Assets	0	0
Level 1 [Member] | Foreign Currency Exchange Forward Contracts [Member]	'	'
Liabilities	'	'
Total Liabilities	0	0
Level 2 [Member]	'	'
Assets	'	'
Total Assets	200,900	74,470
Level 2 [Member] | Money Market Funds [Member]	'	'
Assets	'	'
Total Assets	0	0
Level 2 [Member] | Certificates of Deposit [Member]	'	'
Assets	'	'
Total Assets	2,640	2,160
Level 2 [Member] | Commercial Paper [Member]	'	'
Assets	'	'
Total Assets	88,720	14,843
Level 2 [Member] | Corporate Bonds [Member]	'	'
Assets	'	'
Total Assets	109,540	57,467
Level 2 [Member] | U.S. Treasuries [Member]	'	'
Assets	'	'
Total Assets	0	0
Level 2 [Member] | ARS [Member]	'	'
Assets	'	'
Total Assets	0	0
Level 2 [Member] | Foreign Currency Exchange Forward Contracts [Member]	'	'
Liabilities	'	'
Total Liabilities	64	112
Level 3 [Member]	'	'
Assets	'	'
Total Assets	0	2,873
Level 3 [Member] | Money Market Funds [Member]	'	'
Assets	'	'
Total Assets	0	0
Level 3 [Member] | Certificates of Deposit [Member]	'	'
Assets	'	'
Total Assets	0	0
Level 3 [Member] | Commercial Paper [Member]	'	'
Assets	'	'
Total Assets	0	0
Level 3 [Member] | Corporate Bonds [Member]	'	'
Assets	'	'
Total Assets	0	0
Level 3 [Member] | U.S. Treasuries [Member]	'	'
Assets	'	'
Total Assets	0	0
Level 3 [Member] | ARS [Member]	'	'
Assets	'	'
Total Assets	0	2,873
Level 3 [Member] | Foreign Currency Exchange Forward Contracts [Member]	'	'
Liabilities	'	'
Total Liabilities	$0	$0

Fair_Value_Measurements_and_Ot4

Fair Value Measurements and Other-Than-Temporary Impairments - Reconciliation of All Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (ARS [Member], Fair Value, Measurements, Recurring [Member], Level 3 [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 29, 2012		Sep. 28, 2013		Sep. 29, 2012
ARS [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'
Beginning balance	$2,796		$2,873		$7,675
Total Net Gains Included in Other Comprehensive Income	83	[1]	0		143	[1]
Calls	0	[2]	-92	[3]	-4,939	[2]
Sold	'		-2,781	[4]	'
Ending balance	$2,879		$0		$2,879
[1]	Amount represents the change in the non-credit loss related other-than-temporary impairments (“OTTI”) recorded in Accumulated other comprehensive loss in the accompanying condensed consolidated balance sheets.
[2]	Amount represents the fair market value of the securities called. Realized gains on these calls for the nine months ended September 29, 2012 were $0.5 million.
[3]	Amount represents the fair market value of the securities called at par value. Realized gains for the nine months ended September 28, 2013 were not significant.
[4]	Amount represents the fair market value of the securities sold at 95% par value. Realized gains for the nine months ended September 28, 2013 were $0.2 million.

Fair_Value_Measurements_and_Ot5

Fair Value Measurements and Other-Than-Temporary Impairments - Reconciliation of All Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Details) (USD $)	3 Months Ended	9 Months Ended
In Millions, unless otherwise specified	Mar. 30, 2013	Sep. 28, 2013	Sep. 29, 2012
Fair Value Disclosures [Abstract]	'	'	'
Available-for-sale auction rate securities tender value as percent of par value	95.00%	95.00%	'
Realized gains on these calls	$0.20	$0.20	$0.50

Fair_Value_Measurements_and_Ot6

Fair Value Measurements and Other-Than-Temporary Impairments - Investments at Fair Value (Details) (USD $)	Sep. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Adjusted Amortized Cost	$281,140	$117,741
Gross Unrealized Gains	52	193
Gross Unrealized Losses	-100	-11
Fair Value	281,092	117,923
Money Market Funds [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Adjusted Amortized Cost	72,386	25,560
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	72,386	25,560
Certificates of Deposit [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Adjusted Amortized Cost	2,640	2,160
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2,640	2,160
Commercial Paper [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Adjusted Amortized Cost	88,713	14,848
Gross Unrealized Gains	13	0
Gross Unrealized Losses	-6	-5
Fair Value	88,720	14,843
Corporate Bonds [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Adjusted Amortized Cost	109,598	57,451
Gross Unrealized Gains	36	22
Gross Unrealized Losses	-94	-6
Fair Value	109,540	57,467
U.S. Treasuries [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Adjusted Amortized Cost	7,803	15,015
Gross Unrealized Gains	3	5
Gross Unrealized Losses	0	0
Fair Value	7,806	15,020
ARS [Member]	'	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'	'
Adjusted Amortized Cost	'	2,707	[1]
Gross Unrealized Gains	'	166
Gross Unrealized Losses	'	0
Fair Value	'	$2,873
[1]	(1) Amount represents the par value less $0.4 million of credit-related OTTI recognized through earnings in prior years.

Fair_Value_Measurements_and_Ot7

Fair Value Measurements and Other-Than-Temporary Impairments - Investments at Fair Value (Parenthetical) (Details) (ARS [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 29, 2012
ARS [Member]	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'
OTTI credit related to prior period	$0.40

Fair_Value_Measurements_and_Ot8

Fair Value Measurements and Other-Than-Temporary Impairments - Roll-Forward of Amortized Cost, Cumulative OTTI Recognized in Earnings and Accumulated Other Comprehensive Loss (Details) (USD $)	Sep. 28, 2013	Dec. 29, 2012	Sep. 28, 2013
In Thousands, unless otherwise specified			OTTI Recognized in Earnings and Accumulated Other Comprehensive Loss [Member]
Amortized Cost	'	'	'
Amortized Cost, Beginning Balance	$281,140	$117,741	$2,707
Amortized Cost, Call on investments	'	'	-87
Amortized Cost, Investments sold	'	'	-2,620
Amortized Cost, Ending Balance	281,140	117,741	0
Cumulative OTTI in Earnings	'	'	'
Cumulative OTTI in Earnings, Beginning Balance	'	'	-394
Cumulative OTTI in Earnings, Call on investments	'	'	13
Cumulative OTTI in Earnings, Investments sold	'	'	381
Cumulative OTTI in Earnings, Ending Balance	'	'	0
Unrealized Gain	'	'	'
Unrealized Gain, Beginning Balance	'	'	784
Unrealized Gain, Call on investments	'	'	-25
Unrealized Gain, Investments sold	'	'	-759
Unrealized Gain, Ending Balance	'	'	0
OTTI Loss in Accumulated Other Comprehensive Loss	'	'	'
OTTI Loss in Accumulated Other Comprehensive Loss, Beginning Balance	'	'	-618
OTTI Loss in Accumulated Other Comprehensive Loss, Call on investments	'	'	20
OTTI Loss in Accumulated Other Comprehensive Loss, Investments sold	'	'	598
OTTI Loss in Accumulated Other Comprehensive Loss, Ending Balance	'	'	0
Accumulated Other Comprehensive Income (Loss)	'	'	'
Accumulated Other Comprehensive Income (Loss), Beginning Balance	'	'	166
Accumulated Other Comprehensive Income (Loss), Call on investments	'	'	-5
Accumulated Other Comprehensive Income (Loss), Investments sold	'	'	-161
Accumulated Other Comprehensive Income (Loss), Ending Balance	'	'	$0

Costmethod_Investment_Addition

Cost-method Investment - Additional Information (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Statement of Financial Position [Abstract]	'	'
Cost of Company Investment	$9,000	$9,000
Less than percent of voting securities	20.00%	'

Derivative_Instruments_Additio

Derivative Instruments - Additional Information (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Investments, Debt and Equity Securities [Abstract]	'	'	'	'
Euro denominated forward contracts maturity period	'30 days	'	'30 days	'
Before-tax effect of foreign currency exchange forward contracts not designated as hedging instruments, gain (loss)	($1.20)	($0.20)	($1.40)	($0.40)

Derivative_Instruments_Fair_Va

Derivative Instruments - Fair Value of Derivative Instruments Not Designated as Hedging Activities (Details) (USD $)	Sep. 28, 2013		Dec. 29, 2012
In Thousands, unless otherwise specified
Derivative [Line Items]	'		'
Gross Notional	$24,618	[1]	$24,377	[1]
Other Accrued Liabilities	-64		-112
Designated as Hedging Instrument [Member] | Euro Denominated Exchange Forward Contracts Receivables [Member]	'		'
Derivative [Line Items]	'		'
Gross Notional	23,255	[1]	22,882	[1]
Other Accrued Liabilities	-60		-105
Designated as Hedging Instrument [Member] | Foreign Currency Exchange Restricted Cash Forward Contracts [Member]	'		'
Derivative [Line Items]	'		'
Gross Notional	1,363	[1]	1,495	[1]
Other Accrued Liabilities	($4)		($7)
[1]	Represents the face amounts of forward contracts that were outstanding as of the period noted.

Balance_Sheet_Details_Selected

Balance Sheet Details - Selected Balance Sheet Items (Details) (USD $)	Sep. 28, 2013		Dec. 29, 2012
In Thousands, unless otherwise specified
Inventory	'		'
Raw materials	$12,154		$13,003
Work in process	45,681		57,281
Finished goods	65,670	[1]	57,525	[1]
Total	123,505		127,809
Property, plant and equipment, net:	'		'
Property, plant and equipment	213,039		197,569
Less accumulated depreciation and amortization	-133,977		-117,226
Total	79,062		80,343
Accrued expenses:	'		'
Loss contingency related to non-cancelable purchase commitments	3,948		5,401
Professional and other consulting fees	1,969		3,703
Taxes payable	2,642		3,588
Royalties	999		1,516
Accrued rebate and customer prepay liability	1,059		1,284
Accrued interest on convertible senior notes	875		0
Other accrued expenses	9,798		9,991
Total	21,290		25,483
Computer Hardware [Member]	'		'
Property, plant and equipment, net:	'		'
Property, plant and equipment	9,362		9,024
Computer Software [Member]	'		'
Property, plant and equipment, net:	'		'
Property, plant and equipment	16,728		15,834
Laboratory and Manufacturing Equipment [Member]	'		'
Property, plant and equipment, net:	'		'
Property, plant and equipment	143,680		120,543
Furniture and Fixtures [Member]	'		'
Property, plant and equipment, net:	'		'
Property, plant and equipment	1,348		1,285
Leasehold Improvements [Member]	'		'
Property, plant and equipment, net:	'		'
Property, plant and equipment	34,952		33,370
Construction in Progress [Member]	'		'
Property, plant and equipment, net:	'		'
Property, plant and equipment	$6,969		$17,513
[1]	Included in finished goods inventory at September 28, 2013 and December 29, 2012 were $14.0 million and $12.2 million, respectively, of inventory at customer locations for which product acceptance had not occurred.

Balance_Sheet_Details_Details_

Balance Sheet Details - Details of Selected Balance Sheet Items (Parenthetical) (Details) (Customer Locations [Member], USD $)	Sep. 28, 2013	Dec. 29, 2012
In Millions, unless otherwise specified
Customer Locations [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Inventory awaiting customer acceptance	$14	$12.20

Balance_Sheet_Details_Letters_

Balance Sheet Details - Letters of Credit (Details) (USD $)	Sep. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Balance Sheet Related Disclosures [Abstract]	'	'
Value added tax license	$1,395	$1,536
Customer proposal guarantee	1,353	1,373
Property leases	699	699
Letters of credit outstanding	$3,447	$3,608

Comprehensive_Loss_Summary_of_

Comprehensive Loss - Summary of Changes in Accumulated Other Comprehensive Loss (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]	'	'	'	'
Beginning balance	'	'	($2,228)	'
Other comprehensive loss before reclassifications	'	'	-1,080	'
Amounts reclassified from accumulated other comprehensive loss	'	'	-166	'
Net change in accumulated other comprehensive income (loss)	-54	747	-1,246	379
Ending balance	-3,474	'	-3,474	'
Unrealized Gain on Auction Rate Securities [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]	'	'	'	'
Beginning balance	'	'	166	'
Other comprehensive loss before reclassifications	'	'	0	'
Amounts reclassified from accumulated other comprehensive loss	'	'	-166	'
Net change in accumulated other comprehensive income (loss)	'	'	-166	'
Ending balance	0	'	0	'
Unrealized Gain on Other Available-for-Sale Securities [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]	'	'	'	'
Beginning balance	'	'	16	'
Other comprehensive loss before reclassifications	'	'	-64	'
Amounts reclassified from accumulated other comprehensive loss	'	'	0	'
Net change in accumulated other comprehensive income (loss)	'	'	-64	'
Ending balance	-48	'	-48	'
Foreign Currency Translation [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]	'	'	'	'
Beginning balance	'	'	-1,650	'
Other comprehensive loss before reclassifications	'	'	-1,016	'
Amounts reclassified from accumulated other comprehensive loss	'	'	0	'
Net change in accumulated other comprehensive income (loss)	'	'	-1,016	'
Ending balance	-2,666	'	-2,666	'
Accumulated Tax Effect [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]	'	'	'	'
Beginning balance	'	'	-760	'
Other comprehensive loss before reclassifications	'	'	0	'
Amounts reclassified from accumulated other comprehensive loss	'	'	0	'
Net change in accumulated other comprehensive income (loss)	'	'	0	'
Ending balance	($760)	'	($760)	'

Comprehensive_Loss_Components_

Comprehensive Loss - Components of Reclassifications of Accumulated Other Comprehensive Loss (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Other gain (loss), net:	($444)	($617)	($805)	($892)
Provision for income taxes	-308	-434	-1,240	-1,540
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gain on Auction Rate Securities [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Other gain (loss), net:	'	'	-166	'
Provision for income taxes	'	'	0	'
Total, net of income tax	'	'	($166)	'

Basic_and_Diluted_Net_Income_L2

Basic and Diluted Net Income (Loss) Per Common Share Basic and Diluted Net Income (Loss) Per Common Share - Computation of Net Loss Per Common Share Basic and Diluted (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Earnings Per Share [Abstract]	'	'	'	'
Net income (loss)	$3,347	($19,081)	($21,941)	($69,242)
Basic weighted average common shares outstanding (shares)	118,740	111,579	116,653	110,216
Employee equity plans (shares)	5,939	0	0	0
Diluted (shares)	124,679	111,579	116,653	110,216
Basic (USD per share)	$0.03	($0.17)	($0.19)	($0.63)
Diluted (USD per share)	$0.03	($0.17)	($0.19)	($0.63)

Basic_and_Diluted_Net_Income_L3

Basic and Diluted Net Income (Loss) Per Common Share Basic and Diluted Net Income (Loss) Per Common Share - Antidilutive Shares Excluded from Computation of Diluted Net Loss Per Share (Details)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,383	18,630	14,558	18,630
Stock Options [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	408	9,348	6,603	9,348
RSUs [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	89	6,818	6,559	6,818
PSUs [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	211	1,405	721	1,405
ESPP [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	675	966	675	966
Warrants to Purchase Common Stock [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	93	0	93

Convertible_Senior_Notes_Addit

Convertible Senior Notes - Additional Information (Details) (USD $)	9 Months Ended			1 Months Ended	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 27, 2013	30-May-13	Sep. 28, 2013
				1.75% Convertible Senior Notes Due June 1, 2018 [Member]	1.75% Convertible Senior Notes Due June 1, 2018 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Debt instrument issued	'	'	'	$150,000,000	'
Debt instrument interest percentage	1.75%	'	'	1.75%	'
Maturity date of debt instrument	'	'	'	1-Jun-18	'
Frequency of payment of interest	'	'	'	'	'payable semi-annually in arrears on June 1 and December 1 of each year
Net proceeds from issuance of debt	144,469,000	0	'	'	144,500,000
Initial conversion rate per $1,000 principal amount of Notes	79.4834	'	'	'	'
Principal amount of Notes, subject to anti-dilution adjustments	1,000	'	'	'	'
Initial conversion price	$12.58	'	'	'	'
Convertible threshold trading days	'20 days	'	'	'	'
Convertible threshold consecutive trading days	'30 days	'	'	'	'
Convertible threshold minimum percentage	130.00%	'	'	'	'
Convertible, threshold maximum percentage	98.00%	'	'	'	'
Purchase price as a percentage on principal amount of the notes upon the occurrence of a fundamental change	100.00%	'	'	'	'
Remaining contractual life of senior notes	'	'	'	'	'5 years
Debt instrument discount to be amortized	'	'	'	'	42,700,000
Debt Issuance Cost	'	'	'	'	5,500,000
Deferred tax liability related to Notes	'	'	'	'	17,000,000
Additional effective rate of interest to be used on amortized carrying value	5.12%	'	'	'	'
Total estimated fair value of the notes	$173,600,000	'	'	'	'
Closing price of common stock	'	'	$11.40	'	'

Convertible_Senior_Notes_Compo

Convertible Senior Notes - Components of Convertible Senior Notes (Details) (1.75% Convertible Senior Notes Due June 1, 2018 [Member], USD $)	30-May-13	Sep. 28, 2013	Sep. 28, 2013	Sep. 28, 2013
		Additional Paid-in Capital [Member]	Other Noncurrent Assets [Member]	Long-term Debt [Member]
Debt Instrument [Line Items]	'	'	'	'
Principal amount	$150,000,000	'	'	$150,000,000
Debt discount	'	'	'	-45,000,000
Equity component	'	45,000,000	'	'
Debt issuance cost	'	-1,659,000	'	'
Initial transaction amounts and debt issuance cost	'	'	3,872,000	'
Initial transaction amounts, long-term debt	'	'	'	105,000,000
Amortization of debt issuance cost	'	'	-202,000	'
Amortization of debt discount	'	'	'	2,350,000
Net carrying amount, other non-current assets	'	'	3,670,000	'
Initial transaction amount and net carrying amount, APIC	'	43,341,000	'	'
Net carrying amount, long-term debt	'	'	'	$107,350,000

Convertible_Senior_Notes_Inter

Convertible Senior Notes - Interest Expense Recognized Related to Notes Prior to Capitalization of Interest (Details) (USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 28, 2013
Debt Disclosure [Abstract]	'	'
Contractual interest expense	$656	$875
Amortization of debt issuance costs	152	202
Amortization of debt discount	1,770	2,350
Total interest expense recognized related to notes prior to capitalization of interest	$2,578	$3,427

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Details) (USD $)

3 Months Ended

9 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

In Millions, except Share data, unless otherwise specified

Sep. 28, 2013

Mar. 30, 2013

Sep. 28, 2013

Sep. 27, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 29, 2012

Dec. 29, 2012

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 29, 2012

NASDAQ Composite Index [Member]

NASDAQ Composite Index [Member]

NASDAQ Telecom Composite Index [Member]

NASDAQ Telecom Composite Index [Member]

NASDAQ Telecom Composite Index [Member]

NASDAQ Telecom Composite Index [Member]

Performance Stock Units Grants [Member]

Performance Stock Units Grants [Member]

Performance Stock Units Grants [Member]

Performance Stock Units Grants [Member]

Performance Stock Units Grants [Member]

Performance Stock Units Grants [Member]

Performance Stock Units Grants [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Restricted Stock Units [Member]

Minimum [Member]

Maximum [Member]

2007 Equity Incentive Plan [Member]

2007 Equity Incentive Plan [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Granted options to employees to purchase shares of common stock

16,800,000

'

16,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Closing price of common stock

'

'

'

$11.40

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of shares available for grant cost

400,000

'

3,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amortization of stock-based compensation

'

'

'

'

'

'

'

'

'

'

$0.50

$1

$0.10

$2.80

'

'

'

$5.50

$6.90

$18.20

$20.60

Ranges of number of shares issued on vesting of PSUs

'

'

0.5

'

'

'

'

'

0

1.5

'

'

'

'

'

0.5

2

'

'

'

'

Grant period

'

'

'

'

'3 years

'4 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of shares released under PSUs

500,000

'

500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares of PSUs to executive officers

'

'

'

'

'

'

0

600,000

'

'

'

'

'

'

500,000

'

'

'

'

'

'

PSUs released on achievement of performance goals

'

'

'

'

'

'

'

'

'

'

'

'

200,000

'

'

'

'

'

'

'

'

Amortization of stock based compensation expense offset

'

'

'

'

'

'

'

'

'

'

'

'

1.5

'

'

'

'

'

'

'

'

Decrease in fair value

'

'

'

'

'

'

'

'

'

'

'

'

-1.4

'

'

'

'

'

'

'

'

Number of shares to be purchased on exercise of warrants

'

92,592

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Consideration for exercise of warrants

'

$0.50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of Company's Equity Award Activity - Options (Details) (Stock Options [Member], USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2013
Stock Options [Member]	'
Number of Options	'
Number of Options, Beginning Balance	9,008
Number of Options, exercised	-1,988
Number of Options, canceled	-417
Number of Options, Ending Balance	6,603
Number of Options, Vested and expected to vest	6,592
Number of Options, Exercisable	6,187
Average Exercise Price Per Share	'
Average Exercise Price Per Share, Beginning Balance	$7.13
Average Exercise Price Per Share, Options exercised	$6.53
Average Exercise Price Per Share, Options canceled	$7.96
Average Exercise Price Per Share, Ending Balance	$7.26
Average Exercise Price Per Share, Exercisable	$7.22
Aggregate Intrinsic Value	'
Aggregate Intrinsic Value, Beginning Balance	$5,726
Aggregate Intrinsic Value, Options exercised	6,848
Aggregate Intrinsic Value, Ending Balance	27,954
Aggregate Intrinsic Value, Vested and expected to vest	27,916
Aggregate Intrinsic Value, Exercisable	$26,493

Stockhodlers_Equity_Summary_of

Stockhodlers' Equity - Summary of Company's Equity Award Activity - RSUs (Details) (Restricted Stock Units (RSUs) [Member], USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2013
Restricted Stock Units (RSUs) [Member]	'
Number of Restricted Stock Units	'
Number of Stock Units, Beginning Balance	6,703
Number of Restricted Stock Units, granted	3,258
Number of Restricted Stock Units, released	-2,903
Number of Restricted Stock Units, canceled	-499
Number of Stock Units, Ending Balance	6,559
Number of Restricted Stock Units, Expected to vest	6,375
Weighted- Average Grant Date Fair Value Per Share	'
Weighted-Average Grant Date Fair Value Per Share, Beginning Balance	$8.01
Weighted-Average Grant Date Fair Value Per Share, granted	$7.36
Weighted-Average Grant Date Fair Value Per Share, released	$8.27
Weighted-Average Grant Date Fair Value Per Share, canceled	$7.67
Weighted-Average Grant Date Fair Value Per Share, Ending Balance	$7.60
Aggregate Intrinsic Value	'
Aggregate Intrinsic Value, Beginning Balance	$38,873
Aggregate Intrinsic Value, RSUs released	23,389
Aggregate Intrinsic Value, Ending Balance	74,768
Aggregate Intrinsic Value, Expected to vest	$72,679

Stockholders_Equity_Summary_of1

Stockholders' Equity - Summary of Company's Equity Award Activity - PSUs (Details) (PSUs [Member], USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2013
PSUs [Member]	'
Number of Performance Stock Units	'
Number of Stock Units, Beginning Balance	1,368
Number of Performance Stock Units, granted	552
Number of Performance Stock Units, released	-684
Number of Performance Stock Units, canceled	-515
Number of Stock Units, Ending Balance	721
Number of Restricted Stock Units, Expected to vest	490
Weighted- Average Grant Date Fair Value Per Share	'
Weighted-Average Grant Date Fair Value Per Share, Beginning Balance	$10.53
Weighted-Average Grant Date Fair Value Per Share, granted	$6.70
Weighted-Average Grant Date Fair Value Per Share, released	$10.53
Weighted-Average Grant Date Fair Value Per Share, canceled	$11.31
Weighted-Average Grant Date Fair Value Per Share, Ending Balance	$7.04
Aggregate Intrinsic Value	'
Aggregate Intrinsic Value, Beginning Balance	$7,933
Aggregate Intrinsic Value, PSUs released	4,284
Aggregate Intrinsic Value, Ending Balance	8,214
Aggregate Intrinsic Value, Expected to vest	$5,587

Stockholders_Equity_Total_Stoc

Stockholders' Equity - Total Stock Based Compensation Cost for Instruments Granted but Not Yet Amortized (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Stock options, Unrecognized Compensation Expense, Net	$1,420
Stock options, Weighted-Average Period (in years)	'1 year 0 months 7 days
Restricted Stock Units [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Unrecognized Compensation Expense, Net	32,616
Weighted-Average Period (in years)	'2 years 3 months 3 days
PSUs [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Unrecognized Compensation Expense, Net	$2,183
Weighted-Average Period (in years)	'1 year 8 months 12 days

Stockholders_Equity_Ranges_of_

Stockholders' Equity - Ranges of Estimated Values of Stock Options and Performance-Based Stock Options Granted (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation expense	$7,643	$11,317	$23,802	$31,684
Stock Compensation Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation expense	$665	$2,553	$2,190	$7,121
Stock Compensation Plan [Member] | Minimum [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Volatility	'	'	'	65.00%
Risk-free interest rate	'	'	'	0.70%
Expected life	'	'	'	'4 years
Estimated fair value	'	'	'	$3.75
Stock Compensation Plan [Member] | Maximum [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Volatility	'	'	'	68.00%
Risk-free interest rate	'	'	'	1.00%
Expected life	'	'	'	'5 years 3 months 18 days
Estimated fair value	'	'	'	$3.76

Stockholders_Equity_Estimated_

Stockholders' Equity - Estimated Fair Value of ESPP Shares (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation expense	$7,643	$11,317	$23,802	$31,684
Employee Stock Purchase Plans [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Volatility	49.00%	54.00%	'	'
Risk-free interest rate	0.10%	0.17%	'	'
Expected life	'6 months	'6 months	'6 months	'6 months
Estimated fair value	$3	$1.73	'	'
Stock-based compensation expense	$777	$895	$2,050	$2,653
Minimum [Member] | Employee Stock Purchase Plans [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Volatility	'	'	46.00%	54.00%
Risk-free interest rate	'	'	0.10%	0.16%
Estimated fair value	'	'	$1.87	$1.73
Maximum [Member] | Employee Stock Purchase Plans [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Volatility	'	'	49.00%	57.00%
Risk-free interest rate	'	'	0.14%	0.17%
Estimated fair value	'	'	$3	$2.63

Stockholders_Equity_Summary_of2

Stockholders' Equity - Summary of Effects of Stock-Based Compensation on Company's Balance Sheets (Details) (USD $)	Sep. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Stock-Based Compensation Effects in Inventory [Member]	'	'
Effects Of Stock Based Compensation [Line Items]	'	'
Effects Of Stock Based Compensation	$3,656	$4,891
Stock-Based Compensation Effects in Deferred Inventory Cost [Member]	'	'
Effects Of Stock Based Compensation [Line Items]	'	'
Effects Of Stock Based Compensation	16	42
Stock-Based Compensation Effects in Fixed Assets [Member]	'	'
Effects Of Stock Based Compensation [Line Items]	'	'
Effects Of Stock Based Compensation	$152	$171

Stockholders_Equity_Summary_of3

Stockholders' Equity - Summary of Effects of Stock-Based Compensation on Company's Statements of Operations (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013		Sep. 29, 2012		Sep. 28, 2013		Sep. 29, 2012
Effects Of Stock Based Compensation [Line Items]	'		'		'		'
Stock-based compensation effects in net income (loss) before income taxes	$6,516		$9,611		$19,383		$27,809
Cost of revenue - amortization from balance sheet	1,127	[1]	1,706	[1]	4,419	[1]	3,875	[1]
Allocated Share-based Compensation Expense	7,643		11,317		23,802		31,684
Cost of Sales [Member]	'		'		'		'
Effects Of Stock Based Compensation [Line Items]	'		'		'		'
Stock-based compensation effects in net income (loss) before income taxes	422		683		1,382		1,975
Research and Development Expense [Member]	'		'		'		'
Effects Of Stock Based Compensation [Line Items]	'		'		'		'
Stock-based compensation effects in net income (loss) before income taxes	2,434		3,439		8,175		10,454
Selling and Marketing Expense [Member]	'		'		'		'
Effects Of Stock Based Compensation [Line Items]	'		'		'		'
Stock-based compensation effects in net income (loss) before income taxes	1,853		2,685		5,659		7,648
General and Administrative Expense [Member]	'		'		'		'
Effects Of Stock Based Compensation [Line Items]	'		'		'		'
Stock-based compensation effects in net income (loss) before income taxes	$1,807		$2,804		$4,167		$7,732
[1]	Stock-based compensation expense deferred to inventory and deferred inventory costs in prior periods and recognized in the current period.

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Income Tax Disclosure [Abstract]	'	'	'	'
Provision for income taxes	$308	$434	$1,240	$1,540
Provision for income tax percentage	8.40%	-2.30%	-6.00%	-2.30%
Pre-tax income (loss)	$3,655	($18,647)	($20,701)	($67,702)
Federal statutory rate	'	'	35.00%	'

Segment_Information_Revenue_an

Segment Information - Revenue and Long-Lived Assets by Geographic Region (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Revenues	$142,020	$112,214	$405,030	$310,373
Operating Segments [Member] | United States [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Revenues	103,113	79,094	270,437	215,782
Operating Segments [Member] | Other Americas [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Revenues	2,024	3,716	6,544	9,223
Operating Segments [Member] | Americas [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Revenues	105,137	82,810	276,981	225,005
Operating Segments [Member] | Europe, Middle East and Africa [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Revenues	32,262	27,515	103,022	76,944
Operating Segments [Member] | Asia Pacific [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Revenues	$4,621	$1,889	$25,027	$8,424

Segment_Information_Property_P

Segment Information - Property, Plant and Equipment, Net (Details) (USD $)	Sep. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Geographic Information For Property Plant And Equipment [Line Items]	'	'
Total property, plant and equipment, net	$79,062	$80,343
Operating Segments [Member] | United States [Member]	'	'
Geographic Information For Property Plant And Equipment [Line Items]	'	'
Total property, plant and equipment, net	76,271	78,309
Operating Segments [Member] | Other Americas [Member]	'	'
Geographic Information For Property Plant And Equipment [Line Items]	'	'
Total property, plant and equipment, net	364	198
Operating Segments [Member] | Europe, Middle East and Africa [Member]	'	'
Geographic Information For Property Plant And Equipment [Line Items]	'	'
Total property, plant and equipment, net	995	24
Operating Segments [Member] | Asia Pacific [Member]	'	'
Geographic Information For Property Plant And Equipment [Line Items]	'	'
Total property, plant and equipment, net	$1,432	$1,812

Guarantees_Additional_Informat

Guarantees - Additional Information (Details)	9 Months Ended
	Sep. 28, 2013
Minimum [Member]	'
Guarantor Obligations [Line Items]	'
Product warranty period	'1 year
Maximum [Member]	'
Guarantor Obligations [Line Items]	'
Product warranty period	'5 years

Guarantees_Activity_Related_to

Guarantees - Activity Related to Product Warranty (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013		Sep. 29, 2012		Sep. 28, 2013		Sep. 29, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]	'		'		'		'
Beginning balance	$19,701		$13,702		$16,482		$12,865
Charges to operations	5,220		4,241		16,646		10,065
Utilization	-2,645		-1,684		-6,783		-5,488
Change in estimate	886	[1]	-960	[1]	-3,183	[1]	-2,143	[1]
Balance at the end of the period	$23,162		$15,299		$23,162		$15,299
[1]	The Company records hardware warranty liabilities based on the latest quality and cost information available as of that date. The changes in estimate shown here are due to changes in overall actual failure rates and the impact of these changes on the Company’s estimate of expected future returns and changes in the estimated cost of replacing failed units using either repaired or new units.