Peregrine Semiconductor (PSMI) 10-Q 7 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 29, 2014	Apr. 29, 2014
Document Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	29-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Trading Symbol	'PSMI	'
Entity Registrant Name	'PEREGRINE SEMICONDUCTOR CORP	'
Entity Central Index Key	'0000880177	'
Current Fiscal Year End Date	'--12-27	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	33,190,539

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 29, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$12,385	$16,249
Short-term marketable securities	25,963	28,035
Accounts receivable, net	17,761	16,905
Inventories	44,928	53,489
Prepaids and other current assets	7,181	4,085
Total current assets	108,218	118,763
Property and equipment, net	21,480	23,122
Long-term marketable securities	20,591	18,888
Other assets	100	102
Total assets	150,389	160,875
Current liabilities:	'	'
Accounts payable	11,838	12,983
Accrued liabilities	9,934	11,829
Accrued compensation	3,603	4,542
Customer deposits	916	916
Deferred revenue	7,106	6,131
Total current liabilities	33,397	36,401
Other long-term liabilities	828	943
Commitments and contingencies	'	'
Stockholders' equity:	'	'
Preferred stock, $.001 par value, 5,000 shares authorized at March 29, 2014 and December 28, 2013; no shares issued and outstanding at March 29, 2014 and December 28, 2013	'	'
Common stock, $.001 par value, 100,000 shares authorized at March 29, 2014 and December 28, 2013, 33,154 and 32,712 shares issued and outstanding at March 29, 2014 and December 28, 2013, respectively	33	33
Additional paid-in capital	351,313	348,684
Accumulated deficit	-234,979	-224,986
Accumulated other comprehensive loss	-203	-200
Total stockholders' equity	116,164	123,531
Total liabilities and stockholders' equity	$150,389	$160,875

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 29, 2014	Dec. 28, 2013
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	33,154,000	32,712,000
Common stock, shares outstanding	33,154,000	32,712,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Income Statement [Abstract]	'	'
Net revenue	$41,317	$46,625
Cost of net revenue	26,575	26,808
Gross profit	14,742	19,817
Operating expense:	'	'
Research and development	11,384	10,164
Selling, general and administrative	13,361	10,720
Total operating expense	24,745	20,884
Loss from operations	-10,003	-1,067
Interest income (expense), net	35	-79
Other income (expense), net	19	-34
Loss before income taxes	-9,949	-1,180
Income tax expense	44	28
Net loss	($9,993)	($1,208)
Net income per share attributable to common stockholders:	'	'
Basic and diluted net loss per share, in dollars per share	($0.30)	($0.04)
Shares used to compute net income per share attributable to common stockholders:	'	'
Shares used to compute basic and diluted net loss per share	32,937	31,925

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Loss (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'
Net loss	($9,993)	($1,208)
Foreign currency translation adjustments	-5	9
Unrealized gain on marketable securities	2	8
Comprehensive loss	($9,996)	($1,191)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Operating activities	'	'
Net loss	($9,993)	($1,208)
Adjustments to reconcile net loss to net cash used in operating activities:	'	'
Depreciation and amortization	1,817	1,500
Loss on disposal of property and equipment	337	0
Stock-based compensation	2,104	1,466
Imputed interest related to deposit arrangements, net	41	19
Amortization of premium and discount on investments, net	80	106
Changes in operating assets and liabilities:	'	'
Accounts receivable	-767	-839
Inventories	8,570	-3,399
Prepaids and other current and noncurrent assets	-3,188	5,272
Accounts payable and accrued liabilities	-3,988	-15,613
Customer deposits	0	-9,093
Deferred revenue	974	-5,207
Net cash used in operating activities	-4,013	-26,996
Investing activities	'	'
Purchase of property and equipment	-628	-1,866
Purchase of marketable securities	-11,222	-8,882
Sale and maturity of marketable securities	11,500	10,340
Net cash used in investing activities	-350	-408
Financing activities	'	'
Payments on customer deposit financing arrangement	0	-2,787
Proceeds from exercise of stock options	525	261
Net cash provided by (used in) financing activities	525	-2,526
Effect of exchange rate changes on cash and cash equivalents	-26	-9
Net change in cash and cash equivalents	-3,864	-29,939
Cash and cash equivalents at beginning of period	16,249	44,106
Cash and cash equivalents at end of period	12,385	14,167
Supplemental disclosure of non cash financing activities	'	'
Reclassification of restricted stock to equity upon vesting of early exercised options	$0	$4

Organization_and_Summary_of_Si

Organization and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 29, 2014
Accounting Policies [Abstract]	'
Organization and Summary of Significant Accounting Policies	'
	Organization and Summary of Significant Accounting Policies
	The Company
	Peregrine Semiconductor Corporation (the Company) is a fabless provider of high performance radio frequency integrated circuits (RFICs). The Company’s solutions leverage its proprietary UltraCMOS technology which enables the design, manufacture, and integration of multiple RF, mixed signal, and digital functions on a single chip. The Company’s solutions target a broad range of applications in the space and military, automotive, broadband, industrial, mobile device, test and measurement equipment, and wireless infrastructure markets.
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements include all adjustments, consisting of normal recurring items, necessary for a fair presentation of the financial statements for interim periods in accordance with accounting principles generally accepted in the United States (US GAAP). The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and the notes thereto for the fiscal year ended December 28, 2013 included in the Company’s Annual Report on Form 10-K filed on February 19, 2014 with the Securities and Exchange Commission (“SEC”). The Company’s accounting policies are described in the “Notes to consolidated financial statements” in our Form 10-K and updated as necessary, in this Form 10-Q. The year-end condensed consolidated balance sheet data presented for comparative purposes was derived from audited financial statements, but does not include all disclosures required by US GAAP. The results of operations for the three months ended March 29, 2014 are not necessarily indicative of the operating results for the full year or for any other subsequent interim period.
	Principles of Consolidation
	The consolidated financial statements include the accounts of the Company and its subsidiaries. All significant intercompany accounts and transactions have been eliminated upon consolidation.
	Accounting Periods
	The Company uses a 52- or 53-week fiscal year ending on the last Saturday in December. Fiscal year 2013 was a 52-week year ending on December 28, 2013. The Company’s first quarter for fiscal year 2014 and 2013 were 13-week periods ending on March 29, 2014 and March 30, 2013, respectively.
	Use of Estimates
	The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amount of assets and liabilities at the date of the financial statements as well as the reported amounts of net revenue and expense during the reporting period. The Company regularly evaluates estimates and assumptions related to areas such as revenue recognition, allowances for doubtful accounts, warranty obligations, inventory valuation, stock-based compensation expense, deferred income tax valuation allowances, litigation and other loss contingencies. These estimates and assumptions are based on current facts, historical experience and various other factors believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities and the recording of revenue, costs and expenses that are not readily apparent from other sources. Actual results may differ materially and adversely from these estimates. To the extent there are material differences between the estimates and actual results, the Company’s future results of operations will be affected.
	Concentration of Credit Risk
	Financial assets and liabilities, which potentially subject the Company to concentrations of credit risk, consist primarily of cash equivalents, marketable securities, and accounts receivable. The Company limits its exposure to credit loss by placing its cash in high credit quality financial investments. At times, such deposits may be in excess of insured limits. The Company has not experienced any significant losses on its investments.
	Customers that exceed 10% of total net revenue were as follows:
		Three Months Ended
		March 29,		March 30,
		2014		2013
	Macnica	34	%	64	%
	Murata	28	%	*
	Richardson	16	%	16	%
	*    Did not exceed 10% of total revenues for the respective period.
	A significant portion of the Company's net revenue is derived from a limited number of distributors, in particular, Macnica and Richardson. The majority of sales through the Company's distributor, Macnica, are to module manufacturer Murata. The decrease in Macnica sales during the three months ended March 29, 2014 was due to the Company beginning to sell directly to Murata.
	Fair Value of Financial Instruments
	The Company applies fair value accounting for all financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. The Company’s financial instruments consist principally of cash and cash equivalents and marketable securities. The fair value of a financial instrument is the amount that would be received in an asset sale or paid to transfer a liability in an orderly transaction between unaffiliated market participants. Assets and liabilities measured at fair value are categorized based on whether or not the inputs are observable in the market and the degree that the inputs are observable. The categorization of financial instruments within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The hierarchy is prioritized into three levels (with Level 3 being the lowest) defined as follows:
	Level 1: Inputs are based on quoted market prices for identical assets or liabilities in active markets at the measurement date.
	Level 2: Inputs include quoted prices for similar assets or liabilities in active markets and/or quoted prices for identical or similar assets or liabilities in markets that are not active near the measurement date.
	Level 3: Inputs include management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. The inputs are unobservable in the market and significant to the instrument’s valuation.
	The fair value of the Company’s cash equivalents was determined based on “Level 1” inputs. The fair value of marketable securities was determined based on “Level 2” inputs. The fair value of the Company’s “Level 2” instruments were valued based on the market approach technique which uses quoted market prices or model driven valuations using significant inputs derived from or corroborated by observable market data. The Company does not have any marketable securities in the “Level 3” category. The Company believes that the recorded values of all of the other financial assets and liabilities approximate their current fair values because of maturity and respective duration of these assets and liabilities.

Net_Loss_per_Share

Net Loss per Share	3 Months Ended
	Mar. 29, 2014
Earnings Per Share [Abstract]	'
Net Loss per Share	'
	Net Loss per Share
	Basic net loss per share is calculated by dividing net loss attributable to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted net loss per share is calculated on the basis of the weighted-average number of shares of common stock including the effect of potential dilution that could occur if securities to issue common stock were exercised or converted into common stock.
		Three Months Ended
		March 29,			March 30,
		2014			2013
	Numerator:
	Net loss	$	(9,993	)	$	(1,208	)
	Denominator:
	Weighted average common shares outstanding	32,937			31,931
	Less: weighted average unvested shares of common stock subject to repurchase	—			6
	Weighted average common shares used in computing basic and diluted net loss per share	32,937			31,925
	Basic and diluted net loss per share	$	(0.30	)	$	(0.04	)
	Historical outstanding anti-dilutive securities not included in diluted net loss per share calculation:
	Common stock options and awards	8,950			7,657
	Common stock warrants	2			2
		8,952			7,659

Certain_Financial_Statement_In

Certain Financial Statement Information	3 Months Ended
	Mar. 29, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Certain Financial Statement Information	'
	Certain Financial Statement Information
	Inventories consisted of the following:
		March 29,				December 28,
		2014				2013
	Raw materials	$	18,962			$	22,265
	Work in progress	19,788				22,100
	Finished goods	6,178				9,124
		$	44,928			$	53,489
	During the quarter ended March 29, 2014, the Company recorded inventory write-downs of $1,667, related to excess and obsolete inventory. These write-downs were the result of changes in customer forecasted demand in March 2014 from one of the Company's distributors. During the quarter ended March 29, 2014, the Company also recorded reductions to the carrying value of inventories of $533 as a result of a lower of cost or market valuation. These write-downs were due to additional selling price reductions during the quarter that the Company believes were necessary to respond to competitive pricing pressures for certain products. These inventory reductions were recorded in cost of net revenues. During the quarter ended March 30, 2013, the inventory write-downs were not material.
	Included in the table are inventories held by others, which include distributors and third-parties in the Company’s supply chain of $6,372 and $7,874 at March 29, 2014 and December 28, 2013, respectively.
	Property and equipment consist of the following:
		Useful Life		March 29,				December 28,
		(Years)		2014				2013
	Computer equipment and software	3 - 5		$	6,614			$	6,390
	Machinery and equipment	5		41,210				40,427
	Office furniture and equipment	7		788				1,081
	Leasehold improvements	*		4,896				5,180
	Construction in progress			1,148				1,544
				54,656				54,622
	Less accumulated depreciation and amortization			(33,176		)		(31,500		)
				$	21,480			$	23,122
	*    Leasehold improvements are amortized over the estimated life of the asset or remaining term of the lease, whichever is shorter.
	Depreciation and amortization expense was $1,817 and $1,500 for the three months ended March 29, 2014 and March 30, 2013, respectively.
	Accrued liabilities consisted of the following:
		March 29,				December 28,
		2014				2013
	Accrued inventory purchases	$	1,535			$	1,717
	Accrued inventory repurchase obligation	4,389				6,510
	Accrued other	4,010				3,602
		$	9,934			$	11,829
	Accrued inventory repurchase obligation represents raw materials sold to suppliers for processing. These raw materials remain part of the Company’s total inventory and the transactions include only customary terms and conditions, such as shipping and payment terms.

Financial_Instruments

Financial Instruments	3 Months Ended
	Mar. 29, 2014
Investments, All Other Investments [Abstract]	'
Financial Instruments	'
	Financial Instruments
	The following tables show the Company’s cash and marketable securities’ cost, unrealized gains, unrealized losses and fair value by significant investment category measured at fair value on a recurring basis and recorded as cash and cash equivalents or short- and long-term marketable securities as of March 29, 2014:
		March 29, 2014
											Reported as
		Cost		Unrealized		Unrealized			Fair		Cash and		Short-Term		Long-Term
				Gains		Losses			Value		Cash		Marketable		Marketable
											Equivalents		Securities		Securities
	Cash	$	6,788	$	—	$	—		$	6,788	$	6,788	$	—	$	—
	Level 1:
	Money market funds	5,597		—		—			5,597		5,597		—		—
	Subtotal	5,597		—		—			5,597		5,597		—		—
	Level 2:
	U.S. Agency securities	21,610		7		(8		)	21,609		—		12,714		8,895
	Certificates of deposit	8,800		4		(5		)	8,799		—		6,399		2,400
	Commercial paper	999		1		—			1,000		—		1,000		—
	Corporate notes and bonds	15,143		9		(6		)	15,146		—		5,850		9,296
	Subtotal	46,552		21		(19		)	46,554		—		25,963		20,591
	Total	$	58,937	$	21	$	(19	)	$	58,939	$	12,385	$	25,963	$	20,591
	There were no transfers between Level 1, Level 2 or Level 3 securities in the three months ended March 29, 2014. All of the long-term marketable securities had remaining maturities of between one and two years in duration at March 29, 2014.
	As of March 29, 2014, the Company had 33 investments in marketable securities with a fair value of $20,788 that were in an unrealized loss position of $19 for less than 12 months. The Company considers the declines in market value of its marketable securities investment portfolio to be temporary in nature and does not consider any of its investments other-than-temporarily impaired. When evaluating an investment for other-than-temporary impairment, the Company reviews factors such as the length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer and any changes thereto, and the Company’s intent to sell, or whether it is more likely than not it will be required to sell the investment before recovery of the investment’s cost basis.
	The following table presents a summary of the Company’s financial instruments that are measured on a recurring basis as of December 28, 2013:
		28-Dec-13
											Reported as
		Cost		Unrealized		Unrealized			Fair		Cash and		Short-Term		Long-Term
				Gains		Losses			Value		Cash		Marketable		Marketable
											Equivalents		Securities		Securities
	Cash	$	7,023	$	—	$	—		$	7,023	$	7,023	$	—	$	—
	Level 1:
	Money market funds	9,226		—		—			9,226		9,226		—		—
	Subtotal	9,226		—		—			9,226		9,226		—		—
	Level 2:
	U.S. Agency securities	22,929		4		(3		)	22,930		—		15,929		7,001
	Certificates of deposit	8,840		4		(10		)	8,834		—		5,959		2,875
	Commercial paper	998		—		(1		)	997		—		997		—
	Corporate notes and bonds	14,156		9		(3		)	14,162		—		5,150		9,012
	Subtotal	46,923		17		(17		)	46,923		—		28,035		18,888
	Total	$	63,172	$	17	$	(17	)	$	63,172	$	16,249	$	28,035	$	18,888
	There were no transfers between Level 1, Level 2 or Level 3 securities in the year ended December 28, 2013.

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 29, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock-Based Compensation	'
	Stock-Based Compensation
	Stock Options Awards. During the three months ended March 29, 2014, the Company granted 748 non-qualified stock options to employees. The Company uses the Black-Scholes valuation model to calculate the fair value of stock options. The fair value of stock options was estimated at the grant date using the following weighted-average assumptions:
		Three Months Ended
		March 29,				March 30,
		2014				2013
	Expected term (years)	5				5
	Risk-free interest rate	1.57		%		0.81		%
	Dividend rate	—				—
	Volatility	46		%		61		%
	Forfeiture rate	4		%		3		%
	Estimated fair value per stock option	$	2.43			$	5.71
	The risk-free interest rate assumption was based on the U.S. Treasury’s rates for U.S. Treasury constant maturities similar to those of the expected term of the award being valued. The assumed dividend yield was based on the Company’s expectation of not paying dividends in the foreseeable future. The Company utilizes data of peer companies to determine the weighted average expected term in an effort to better align the expected term of the Company’s options with the term experienced by the Company’s peers. In addition, due to the Company’s limited historical data, the estimated volatility incorporates the historical volatility of comparable companies whose share prices are publicly available.
	Restricted Stock Unit Awards. During the three months ended March 29, 2014, the Company granted 523 restricted stock units (RSUs) to employees. The Company uses the grant date fair value, which is calculated by multiplying the number of shares subject to the stock award by the closing price of one share of Common Stock on the date of grant.
	The following summarizes stock plan activity for the three months ended March 29, 2014:
					Stock Options					Restricted Stock Units
		Available for Grant			Number of Shares			Weighted Average Exercise Price		Number of Shares		Weighted Average Grant Date Fair Value
	Outstanding at December 29, 2013	2,787			8,227			$	6.71	—		$	—
	Shares added	1,308			—			—		—		—
	Granted	(1,271	)		748			5.82		523		5.81
	Exercised	—			(441	)		1.19		—		—
	Canceled	92			(92	)		11.2		(15	)	5.81
	Outstanding at March 29, 2014	2,916			8,442			$	6.87	508		$	5.81
	Total stock-based compensation expense recognized during the three months ended March 29, 2014 and March 30, 2013 was comprised of the following:
		Three Months Ended
		March 29,				March 30,
		2014				2013
	Cost of net revenue	$	258			$	196
	Research and development	736				517
	Selling, general and administrative	1,110				753
		$	2,104			$	1,466

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 29, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Legal Proceedings
	On February 14, 2012, the Company filed a lawsuit in the U.S. District Court for the Central District of California, which was subsequently moved to the U.S. District Court for the Southern District of California. The action alleges the infringement of five of the Company’s patents relating to RFICs and switching technology by RF Micro Devices, Inc. (RFMD). The lawsuit alleges that certain of RFMD’s products infringe the Company’s patents relating to silicon on insulator (SOI) design technology for RFICs and seeks, in addition to damages, to permanently enjoin RFMD from further infringement. On March 26, 2013, the Company filed an additional lawsuit against RFMD in the U.S. District Court for the Southern District of California alleging infringement of a sixth patent relating to RFICs and switching technology by RFMD. On April 25, 2013, the Company consolidated these two U.S. District Court actions into one lawsuit. On September 27, 2013, the U.S. District Court set a trial date for November 12, 2014 and, as a result of various consolidating actions and motions, the Company will now only be asserting two patents against RFMD at the trial. In addition, on December 12, 2013, RFMD filed a counterclaim alleging the Company violates a patent owned or licensed by RFMD. The Company believes it is not possible to estimate the likelihood of an unfavorable outcome or the possible loss or range of losses in the event of an unfavorable outcome. Pursuing these actions is costly and could impose a significant burden on management and employees. The Company may receive unfavorable interim rulings in the course of this litigation and there can be no assurance that a favorable outcome will ultimately be obtained. The Company believes the outcome of this pending litigation will not have, individually or in the aggregate, a material adverse effect on its consolidated financial statements.
	On November 14, 2013, representatives of the U.S. Department of Homeland Security (DHS), in collaboration with the United States Attorney’s Office for the Southern District of California (USAO), executed a federal search warrant at the Company's San Diego facilities in connection with an investigation into exports and temporary imports of certain products sold in the aerospace market. The Company is cooperating fully with the USAO and DHS officials. No claims have been asserted and no amounts have been accrued for this contingency in the consolidated financial statements.
	The U.S. Department of State, Office of Defense Trade Controls Compliance (USDS), is conducting a review of the Company’s compliance with the Arms Export Control Act (AECA) and the AECA’s implementation of International Traffic In Arms Regulations (ITAR).  Based on this review the Company could be subject to continued investigation and potential regulatory consequences related to these violations ranging from a no-action letter, government oversight of facilities and export transactions, monetary penalties of up to $500 per violation, and in certain cases, debarment from government contracting, denial of export privileges, and criminal penalties. No claims have been asserted and no amounts have been accrued for this contingency in the consolidated financial statements. Furthermore, due to the preliminary nature of the investigation and the USDS review, the Company believes it is not possible to estimate the likelihood of an unfavorable outcome or the possible loss or range of losses in the event of an unfavorable outcome. Responding to this investigation and review is costly and could impose a significant burden on management and employees. The Company may receive unfavorable interim rulings in the course of this litigation and there can be no assurance that a favorable outcome will ultimately be obtained.
	From time to time, the Company is subject to various claims and suits arising in the ordinary course of business, including commercial, employment and environmental matters. The Company does not expect that the resolution of these matters will have a material adverse effect on its consolidated financial position or results of operations.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 29, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	For the three months ended March 29, 2014 and March 30, 2013, the Company recorded income tax expense of $44 and $28, respectively, which consisted primarily of current foreign taxes.

Supply_and_Prepayment_Agreemen

Supply and Prepayment Agreement	3 Months Ended
	Mar. 29, 2014
Payables and Accruals [Abstract]	'
Supply and Prepayment Agreement	'
	Supply and Prepayment Agreement
	In March 2012, the Company entered into a supply and prepayment agreement with Murata Manufacturing Company, Ltd. (Murata). The agreement was for an initial term of 18 months. Under the terms of the original agreement, Murata agreed to prepay on certain purchase orders placed through a third party distributor and to pay the Company a total deposit of $14,000 between March and July 2012. On September 29, 2012, the Company and Murata agreed to reduce the deposit from $14,000 to $13,000. The Company has been repaying the deposit at a rate based on the number of RFICs purchased by Murata over the four quarters starting from the fourth quarter of fiscal 2012 of up to $13,000. As of December 29, 2013, the Company repaid $12,084 in deposits under the supply and prepayment agreement with Murata. During the three months ended March 29, 2014, the Company did not make any additional payments, resulting in a remaining customer deposit of $916.
	During 2013, the Company received prepayments on purchases made by Macnica, which were applied against outstanding accounts receivable balances. There are no remaining prepayments as of March 29, 2014 as the agreement concluded on March 31, 2013 and the deposit was fully utilized in April of 2013.
	During 2012, the Company paid $4,000 in deposits to suppliers to support production levels. During the three months ended March 29, 2014, the Company received the final $245 in deposit repayments from suppliers resulting in no remaining balance as of March 29, 2014.

Restructuring

Restructuring	3 Months Ended
	Mar. 29, 2014
Restructuring and Related Activities [Abstract]	'
Restructuring	'
	Restructuring
	During December 2013 and January 2014, the Company approved a restructuring plan to reduce operating expenses. These actions included a consolidation of office locations and a reduction in employees across the Company’s operations. The restructuring was driven by long-term strategic and operational decisions.
	The following table summarizes the restructuring activity and related accrual at March 29, 2014:
		Balance at December 28, 2013		Current Charges		Cash Payments/Utilization			Balance at March 29, 2014
	Employee termination benefits	$	418	$	1,416	$	(1,461	)	$	373
	Lease and other contract termination costs	38		209		(38		)	209
	Loss on disposal of property and equipment	—		337		(337		)	—
	Total	$	456	$	1,962	$	(1,836	)	$	582
	The remaining restructuring accrual balance of $582 as of March 29, 2014 is included in accrued liabilities and is expected to be paid in the second quarter of fiscal 2014. The accrual balance approximates fair value due to the short-term payment period. During the three months ended March 29, 2014, the Company recorded restructuring expense of $55 in cost of net revenues, $1,106 in research and development, and $801 in selling, general and administrative.

Organization_and_Summary_of_Si1

Organization and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 29, 2014
Accounting Policies [Abstract]	'
The Company	'
	The Company
	Peregrine Semiconductor Corporation (the Company) is a fabless provider of high performance radio frequency integrated circuits (RFICs). The Company’s solutions leverage its proprietary UltraCMOS technology which enables the design, manufacture, and integration of multiple RF, mixed signal, and digital functions on a single chip. The Company’s solutions target a broad range of applications in the space and military, automotive, broadband, industrial, mobile device, test and measurement equipment, and wireless infrastructure markets.
Basis of Presentation	'
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements include all adjustments, consisting of normal recurring items, necessary for a fair presentation of the financial statements for interim periods in accordance with accounting principles generally accepted in the United States (US GAAP). The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and the notes thereto for the fiscal year ended December 28, 2013 included in the Company’s Annual Report on Form 10-K filed on February 19, 2014 with the Securities and Exchange Commission (“SEC”). The Company’s accounting policies are described in the “Notes to consolidated financial statements” in our Form 10-K and updated as necessary, in this Form 10-Q. The year-end condensed consolidated balance sheet data presented for comparative purposes was derived from audited financial statements, but does not include all disclosures required by US GAAP. The results of operations for the three months ended March 29, 2014 are not necessarily indicative of the operating results for the full year or for any other subsequent interim period.
Principles of Consolidation	'
	Principles of Consolidation
	The consolidated financial statements include the accounts of the Company and its subsidiaries. All significant intercompany accounts and transactions have been eliminated upon consolidation.
Accounting Periods	'
	Accounting Periods
	The Company uses a 52- or 53-week fiscal year ending on the last Saturday in December. Fiscal year 2013 was a 52-week year ending on December 28, 2013. The Company’s first quarter for fiscal year 2014 and 2013 were 13-week periods ending on March 29, 2014 and March 30, 2013, respectively.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amount of assets and liabilities at the date of the financial statements as well as the reported amounts of net revenue and expense during the reporting period. The Company regularly evaluates estimates and assumptions related to areas such as revenue recognition, allowances for doubtful accounts, warranty obligations, inventory valuation, stock-based compensation expense, deferred income tax valuation allowances, litigation and other loss contingencies. These estimates and assumptions are based on current facts, historical experience and various other factors believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities and the recording of revenue, costs and expenses that are not readily apparent from other sources. Actual results may differ materially and adversely from these estimates. To the extent there are material differences between the estimates and actual results, the Company’s future results of operations will be affected.
Concentration of Credit Risk	'
	Concentration of Credit Risk
	Financial assets and liabilities, which potentially subject the Company to concentrations of credit risk, consist primarily of cash equivalents, marketable securities, and accounts receivable. The Company limits its exposure to credit loss by placing its cash in high credit quality financial investments. At times, such deposits may be in excess of insured limits. The Company has not experienced any significant losses on its investments.
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments
	The Company applies fair value accounting for all financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. The Company’s financial instruments consist principally of cash and cash equivalents and marketable securities. The fair value of a financial instrument is the amount that would be received in an asset sale or paid to transfer a liability in an orderly transaction between unaffiliated market participants. Assets and liabilities measured at fair value are categorized based on whether or not the inputs are observable in the market and the degree that the inputs are observable. The categorization of financial instruments within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The hierarchy is prioritized into three levels (with Level 3 being the lowest) defined as follows:
	Level 1: Inputs are based on quoted market prices for identical assets or liabilities in active markets at the measurement date.
	Level 2: Inputs include quoted prices for similar assets or liabilities in active markets and/or quoted prices for identical or similar assets or liabilities in markets that are not active near the measurement date.
	Level 3: Inputs include management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. The inputs are unobservable in the market and significant to the instrument’s valuation.
	The fair value of the Company’s cash equivalents was determined based on “Level 1” inputs. The fair value of marketable securities was determined based on “Level 2” inputs. The fair value of the Company’s “Level 2” instruments were valued based on the market approach technique which uses quoted market prices or model driven valuations using significant inputs derived from or corroborated by observable market data. The Company does not have any marketable securities in the “Level 3” category. The Company believes that the recorded values of all of the other financial assets and liabilities approximate their current fair values because of maturity and respective duration of these assets and liabilities.

Organization_and_Summary_of_Si2

Organization and Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 29, 2014
Accounting Policies [Abstract]	'
Customers that Exceed 10% of Total Net Revenue	'
	Customers that exceed 10% of total net revenue were as follows:
		Three Months Ended
		March 29,		March 30,
		2014		2013
	Macnica	34	%	64	%
	Murata	28	%	*
	Richardson	16	%	16	%
	*    Did not exceed 10% of total revenues for the respective period.

Net_Loss_per_Share_Tables

Net Loss per Share (Tables)	3 Months Ended
	Mar. 29, 2014
Earnings Per Share [Abstract]	'
Net Loss per Share	'
		Three Months Ended
		March 29,			March 30,
		2014			2013
	Numerator:
	Net loss	$	(9,993	)	$	(1,208	)
	Denominator:
	Weighted average common shares outstanding	32,937			31,931
	Less: weighted average unvested shares of common stock subject to repurchase	—			6
	Weighted average common shares used in computing basic and diluted net loss per share	32,937			31,925
	Basic and diluted net loss per share	$	(0.30	)	$	(0.04	)
	Historical outstanding anti-dilutive securities not included in diluted net loss per share calculation:
	Common stock options and awards	8,950			7,657
	Common stock warrants	2			2
		8,952			7,659

Certain_Financial_Statement_In1

Certain Financial Statement Information (Tables)	3 Months Ended
	Mar. 29, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Inventories	'
	Inventories consisted of the following:
		March 29,				December 28,
		2014				2013
	Raw materials	$	18,962			$	22,265
	Work in progress	19,788				22,100
	Finished goods	6,178				9,124
		$	44,928			$	53,489
Property and Equipment	'
	Property and equipment consist of the following:
		Useful Life		March 29,				December 28,
		(Years)		2014				2013
	Computer equipment and software	3 - 5		$	6,614			$	6,390
	Machinery and equipment	5		41,210				40,427
	Office furniture and equipment	7		788				1,081
	Leasehold improvements	*		4,896				5,180
	Construction in progress			1,148				1,544
				54,656				54,622
	Less accumulated depreciation and amortization			(33,176		)		(31,500		)
				$	21,480			$	23,122
	*    Leasehold improvements are amortized over the estimated life of the asset or remaining term of the lease, whichever is shorter.
Accrued Liabilities	'
	Accrued liabilities consisted of the following:
		March 29,				December 28,
		2014				2013
	Accrued inventory purchases	$	1,535			$	1,717
	Accrued inventory repurchase obligation	4,389				6,510
	Accrued other	4,010				3,602
		$	9,934			$	11,829

Financial_Instruments_Tables

Financial Instruments (Tables)	3 Months Ended
	Mar. 29, 2014
Investments, All Other Investments [Abstract]	'
Cash and Marketable Securities' Cost, Unrealized Gains, Unrealized Losses and Fair Value by Significant Investment	'
	The following tables show the Company’s cash and marketable securities’ cost, unrealized gains, unrealized losses and fair value by significant investment category measured at fair value on a recurring basis and recorded as cash and cash equivalents or short- and long-term marketable securities as of March 29, 2014:
		March 29, 2014
											Reported as
		Cost		Unrealized		Unrealized			Fair		Cash and		Short-Term		Long-Term
				Gains		Losses			Value		Cash		Marketable		Marketable
											Equivalents		Securities		Securities
	Cash	$	6,788	$	—	$	—		$	6,788	$	6,788	$	—	$	—
	Level 1:
	Money market funds	5,597		—		—			5,597		5,597		—		—
	Subtotal	5,597		—		—			5,597		5,597		—		—
	Level 2:
	U.S. Agency securities	21,610		7		(8		)	21,609		—		12,714		8,895
	Certificates of deposit	8,800		4		(5		)	8,799		—		6,399		2,400
	Commercial paper	999		1		—			1,000		—		1,000		—
	Corporate notes and bonds	15,143		9		(6		)	15,146		—		5,850		9,296
	Subtotal	46,552		21		(19		)	46,554		—		25,963		20,591
	Total	$	58,937	$	21	$	(19	)	$	58,939	$	12,385	$	25,963	$	20,591
	The following table presents a summary of the Company’s financial instruments that are measured on a recurring basis as of December 28, 2013:
		28-Dec-13
											Reported as
		Cost		Unrealized		Unrealized			Fair		Cash and		Short-Term		Long-Term
				Gains		Losses			Value		Cash		Marketable		Marketable
											Equivalents		Securities		Securities
	Cash	$	7,023	$	—	$	—		$	7,023	$	7,023	$	—	$	—
	Level 1:
	Money market funds	9,226		—		—			9,226		9,226		—		—
	Subtotal	9,226		—		—			9,226		9,226		—		—
	Level 2:
	U.S. Agency securities	22,929		4		(3		)	22,930		—		15,929		7,001
	Certificates of deposit	8,840		4		(10		)	8,834		—		5,959		2,875
	Commercial paper	998		—		(1		)	997		—		997		—
	Corporate notes and bonds	14,156		9		(3		)	14,162		—		5,150		9,012
	Subtotal	46,923		17		(17		)	46,923		—		28,035		18,888
	Total	$	63,172	$	17	$	(17	)	$	63,172	$	16,249	$	28,035	$	18,888

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 29, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Fair Value of Stock Options Estimated at Grant Date	'
	The fair value of stock options was estimated at the grant date using the following weighted-average assumptions:
		Three Months Ended
		March 29,				March 30,
		2014				2013
	Expected term (years)	5				5
	Risk-free interest rate	1.57		%		0.81		%
	Dividend rate	—				—
	Volatility	46		%		61		%
	Forfeiture rate	4		%		3		%
	Estimated fair value per stock option	$	2.43			$	5.71
Share-based Compensation Activity	'
	The following summarizes stock plan activity for the three months ended March 29, 2014:
					Stock Options					Restricted Stock Units
		Available for Grant			Number of Shares			Weighted Average Exercise Price		Number of Shares		Weighted Average Grant Date Fair Value
	Outstanding at December 29, 2013	2,787			8,227			$	6.71	—		$	—
	Shares added	1,308			—			—		—		—
	Granted	(1,271	)		748			5.82		523		5.81
	Exercised	—			(441	)		1.19		—		—
	Canceled	92			(92	)		11.2		(15	)	5.81
	Outstanding at March 29, 2014	2,916			8,442			$	6.87	508		$	5.81
Components of Total Stock- Based Compensation Expense Recognized	'
	Total stock-based compensation expense recognized during the three months ended March 29, 2014 and March 30, 2013 was comprised of the following:
		Three Months Ended
		March 29,				March 30,
		2014				2013
	Cost of net revenue	$	258			$	196
	Research and development	736				517
	Selling, general and administrative	1,110				753
		$	2,104			$	1,466

Restructuring_Tables

Restructuring (Tables)	3 Months Ended
	Mar. 29, 2014
Restructuring and Related Activities [Abstract]	'
Restructuring and Related Costs	'
	The following table summarizes the restructuring activity and related accrual at March 29, 2014:
		Balance at December 28, 2013		Current Charges		Cash Payments/Utilization			Balance at March 29, 2014
	Employee termination benefits	$	418	$	1,416	$	(1,461	)	$	373
	Lease and other contract termination costs	38		209		(38		)	209
	Loss on disposal of property and equipment	—		337		(337		)	—
	Total	$	456	$	1,962	$	(1,836	)	$	582

Customers_that_Exceed_10_of_To

Customers that Exceed 10% of Total Net Revenue (Detail) (Sales Revenue, Net)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Macnica	'	'
Concentration Risk [Line Items]	'	'
Net revenue, contribution by customers	34.00%	64.00%
Murata	'	'
Concentration Risk [Line Items]	'	'
Net revenue, contribution by customers	28.00%	'
Richardson	'	'
Concentration Risk [Line Items]	'	'
Net revenue, contribution by customers	16.00%	16.00%

Net_Loss_per_Share_Detail

Net Loss per Share (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Numerator:	'	'
Net loss	($9,993)	($1,208)
Denominator:	'	'
Weighted average common shares outstanding	32,937	31,931
Less: weighted average unvested shares of common stock subject to repurchase	0	6
Weighted average common shares used in computing basic and diluted net loss per share	32,937	31,925
Basic and diluted net loss per share, in dollars per share	($0.30)	($0.04)
Historical outstanding anti-dilutive securities not included in diluted net loss per share calculation:	'	'
Common stock options and awards	8,952	7,659
Common stock options and awards	'	'
Historical outstanding anti-dilutive securities not included in diluted net loss per share calculation:	'	'
Common stock options and awards	8,950	7,657
Common stock warrants	'	'
Historical outstanding anti-dilutive securities not included in diluted net loss per share calculation:	'	'
Common stock options and awards	2	2

Inventories_Detail

Inventories (Detail) (USD $)	Mar. 29, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'	'
Raw materials	$18,962	$22,265
Work in progress	19,788	22,100
Finished goods	6,178	9,124
Net inventories	$44,928	$53,489

Certain_Financial_Statement_In2

Certain Financial Statement Information Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013	Dec. 28, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'	'	'
Write downs to inventories	$1,667	'	'
Reductions to the carrying value of inventory	533	'	'
Inventories held by third parties	6,372	'	7,874
Depreciation and amortization expense	$1,817	$1,500	'

Property_and_Equipment_Detail

Property and Equipment (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Dec. 28, 2013
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, Gross	$54,656	$54,622
Less accumulated depreciation and amortization	-33,176	-31,500
Property and equipment, Net	21,480	23,122
Computer equipment and software	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, Gross	6,614	6,390
Computer equipment and software | Minimum	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, Useful Life (Years)	'3 years	'
Computer equipment and software | Maximum	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, Useful Life (Years)	'5 years	'
Machinery and equipment	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, Useful Life (Years)	'5 years	'
Property and equipment, Gross	41,210	40,427
Office furniture and equipment	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, Useful Life (Years)	'7 years	'
Property and equipment, Gross	788	1,081
Leasehold improvements	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, Gross	4,896	5,180
Construction in progress	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, Gross	$1,148	$1,544

Accrued_Liabilities_Detail

Accrued Liabilities (Detail) (USD $)	Mar. 29, 2014	Dec. 28, 2013
In Thousands, unless otherwise specified
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'	'
Accrued inventory purchases	$1,535	$1,717
Accrued inventory repurchase obligation	4,389	6,510
Accrued other	4,010	3,602
Accrued liabilities	$9,934	$11,829

Cash_and_Marketable_Securities

Cash and Marketable Securities' Cost, Unrealized Gains, Unrealized Losses and Fair Value by Significant Investment (Detail) (USD $)	Mar. 29, 2014	Dec. 28, 2013	Mar. 30, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Assets, Fair Value Disclosure [Abstract]	'	'	'	'
Cash and cash equivalents	$12,385	$16,249	$14,167	$44,106
Short-term marketable securities	25,963	28,035	'	'
Long-term marketable securities	20,591	18,888	'	'
Fair Value, Measurements, Recurring	'	'	'	'
Assets, Fair Value Disclosure [Abstract]	'	'	'	'
Cost	58,937	63,172	'	'
Unrealized Gains	21	17	'	'
Unrealized Losses	-19	-17	'	'
Fair Value	58,939	63,172	'	'
Cash and cash equivalents	12,385	16,249	'	'
Short-term marketable securities	25,963	28,035	'	'
Long-term marketable securities	20,591	18,888	'	'
Fair Value, Measurements, Recurring | Cash	'	'	'	'
Assets, Fair Value Disclosure [Abstract]	'	'	'	'
Cost	6,788	7,023	'	'
Fair Value	6,788	7,023	'	'
Cash and cash equivalents	6,788	7,023	'	'
Level 1 | Fair Value, Measurements, Recurring	'	'	'	'
Assets, Fair Value Disclosure [Abstract]	'	'	'	'
Cost	5,597	9,226	'	'
Fair Value	5,597	9,226	'	'
Cash and cash equivalents	5,597	9,226	'	'
Level 1 | Fair Value, Measurements, Recurring | Money market funds	'	'	'	'
Assets, Fair Value Disclosure [Abstract]	'	'	'	'
Cost	5,597	9,226	'	'
Fair Value	5,597	9,226	'	'
Cash and cash equivalents	5,597	9,226	'	'
Level 2 | Fair Value, Measurements, Recurring	'	'	'	'
Assets, Fair Value Disclosure [Abstract]	'	'	'	'
Cost	46,552	46,923	'	'
Unrealized Gains	21	17	'	'
Unrealized Losses	-19	-17	'	'
Fair Value	46,554	46,923	'	'
Cash and cash equivalents	0	0	'	'
Short-term marketable securities	25,963	28,035	'	'
Long-term marketable securities	20,591	18,888	'	'
Level 2 | Fair Value, Measurements, Recurring | U.S. Agency securities	'	'	'	'
Assets, Fair Value Disclosure [Abstract]	'	'	'	'
Cost	21,610	22,929	'	'
Unrealized Gains	7	4	'	'
Unrealized Losses	-8	-3	'	'
Fair Value	21,609	22,930	'	'
Short-term marketable securities	12,714	15,929	'	'
Long-term marketable securities	8,895	7,001	'	'
Level 2 | Fair Value, Measurements, Recurring | Certificates of deposit	'	'	'	'
Assets, Fair Value Disclosure [Abstract]	'	'	'	'
Cost	8,800	8,840	'	'
Unrealized Gains	4	4	'	'
Unrealized Losses	-5	-10	'	'
Fair Value	8,799	8,834	'	'
Short-term marketable securities	6,399	5,959	'	'
Long-term marketable securities	2,400	2,875	'	'
Level 2 | Fair Value, Measurements, Recurring | Commercial paper	'	'	'	'
Assets, Fair Value Disclosure [Abstract]	'	'	'	'
Cost	999	998	'	'
Unrealized Gains	1	0	'	'
Unrealized Losses	0	-1	'	'
Fair Value	1,000	997	'	'
Short-term marketable securities	1,000	997	'	'
Level 2 | Fair Value, Measurements, Recurring | Corporate notes and bonds	'	'	'	'
Assets, Fair Value Disclosure [Abstract]	'	'	'	'
Cost	15,143	14,156	'	'
Unrealized Gains	9	9	'	'
Unrealized Losses	-6	-3	'	'
Fair Value	15,146	14,162	'	'
Short-term marketable securities	5,850	5,150	'	'
Long-term marketable securities	$9,296	$9,012	'	'

Financial_Instruments_Addition

Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014
	Investment
Fair Value Disclosures [Abstract]	'
Transfers between Level 1, Level 2 and Level 3 Securities	$0
Number of investments in marketable securities under unrealized loss position	33
Fair value of Investments in marketable securities in unrealized loss position for less than 12 months	$20,788
Minimum	'
Fair Value Disclosures [Abstract]	'
Long term marketable securities maturity period	'1 year
Maximum	'
Fair Value Disclosures [Abstract]	'
Long term marketable securities maturity period	'2 years

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014
Nonqualified stock options	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Non-qualified stock options granted	748
Restricted Stock Units	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Non-option awards granted	523

Fair_Value_of_Stock_Options_Es

Fair Value of Stock Options Estimated at Grant Date (Detail) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'
Weighted-average expected term (years)	'5 years	'5 years
Risk-free interest rate	1.57%	0.81%
Dividend rate	'	'
Volatility	46.00%	61.00%
Forfeiture rate	4.00%	3.00%
Estimated weighted-average fair value per stock option	$2.43	$5.71

Sharebased_Compensation_Activi

Share-based Compensation Activity (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 29, 2014
Available for Grant	'
Shares outstanding, beginning of period	2,787
Shares added	1,308
Granted	-1,271
Canceled	92
Shares outstanding, end of period	2,916
Stock Options	'
Number of Shares	'
Shares outstanding, beginning of period	8,227
Granted	748
Exercised	-441
Canceled	-92
Shares outstanding, end of period	8,442
Weighted Average Exercise Price	'
Weighted-average exercise price, in dollars per share, beginning of period	6.71
Granted, in dollars per share	5.82
Exercised, in dollars per share	1.19
Canceled, in dollars per share	11.2
Weighted-average exercise price, in dollars per share, end of period	6.87
Restricted Stock Units	'
Number of Shares	'
Shares outstanding, beginning of period	0
Granted	523
Canceled	-15
Shares outstanding, end of period	508
Weighted Average Grant Date Fair Value	'
Weighted-average grant date fair value, in dollars per share, beginning of period	0
Granted, in dollars per share	5.81
Canceled, in dollars per share	5.81
Weighted-average grant date fair value, in dollars per share, end of period	5.81

StockBased_Compensation_Expens

Stock-Based Compensation Expense Recognized (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	$2,104	$1,466
Cost of net revenue	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	258	196
Research and development	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	736	517
Selling, general and administrative	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Total stock-based compensation expense	$1,110	$753

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	3 Months Ended
	Mar. 29, 2014
	claim
Commitments and Contingencies Disclosure [Abstract]	'
Monetary penalties, per violation	500
New claims asserted	0
Accrual for contingency	$0

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Income Tax Disclosure [Abstract]	'	'
Income tax expense	$44	$28

Supply_and_Prepayment_Agreemen1

Supply and Prepayment Agreement - Additional Information (Detail) (USD $)	3 Months Ended			5 Months Ended	12 Months Ended
	Mar. 29, 2014	Sep. 30, 2012	Mar. 31, 2012	Jul. 31, 2012	Dec. 28, 2013	Dec. 29, 2012
Payables and Accruals [Abstract]	'	'	'	'	'	'
Initial term of agreement	'	'	'18 months	'	'	'
Proceeds to be prepaid	'	$13,000,000	'	$14,000,000	'	'
Deposits repaid under supply and prepayment agreement	'	'	'	'	12,084,000	'
Customer deposits	916,000	'	'	'	'	'
Deposits paid to suppliers for support production levels	'	'	'	'	'	4,000,000
Deposit repayments from suppliers	245,000	'	'	'	'	'
Remaining deposit to be collected	$0	'	'	'	'	'

Restructuring_Details

Restructuring (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 29, 2014
Restructuring Reserve [Roll Forward]	'
Restructuring Reserve	$456
Restructuring Charges	1,962
Payments for Restructuring	-1,836
Restructuring Reserve	582
Cost of net revenue	'
Restructuring Reserve [Roll Forward]	'
Restructuring Charges	55
Research and development	'
Restructuring Reserve [Roll Forward]	'
Restructuring Charges	1,106
Selling, general and administrative	'
Restructuring Reserve [Roll Forward]	'
Restructuring Charges	801
Employee termination benefits	'
Restructuring Reserve [Roll Forward]	'
Restructuring Reserve	418
Restructuring Charges	1,416
Payments for Restructuring	-1,461
Restructuring Reserve	373
Lease and other contract termination costs	'
Restructuring Reserve [Roll Forward]	'
Restructuring Reserve	38
Restructuring Charges	209
Payments for Restructuring	-38
Restructuring Reserve	209
Loss on disposal of property and equipment	'
Restructuring Reserve [Roll Forward]	'
Restructuring Reserve	0
Restructuring Charges	337
Payments for Restructuring	-337
Restructuring Reserve	$0