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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Cash flows from operating activities:    
Net income (loss) $ 4,655us-gaap_NetIncomeLoss $ (4,241)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 14,988us-gaap_DepreciationAndAmortization 17,911us-gaap_DepreciationAndAmortization
Stock-based compensation 6,693us-gaap_ShareBasedCompensation 6,191us-gaap_ShareBasedCompensation
Unrealized foreign exchange gain, net (4,495)us-gaap_ForeignCurrencyTransactionGainLossUnrealized (1,725)us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Net amortization of premiums and accrued interest of investments 256us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments 275us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Asset impairments   770us-gaap_AssetImpairmentCharges
Gain on investment securities and other (32)us-gaap_GainLossOnSaleOfSecuritiesNet (29)us-gaap_GainLossOnSaleOfSecuritiesNet
Accretion of discount on short-term and long-term obligations 210pmcs_AmortizationOfDiscountOnShortTermAndLongTermObligation  
Amortization of debt issue costs 51us-gaap_AmortizationOfFinancingCosts 51us-gaap_AmortizationOfFinancingCosts
Changes in operating assets and liabilities:    
Accounts receivable, net (6,741)us-gaap_IncreaseDecreaseInAccountsReceivable (546)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories, net 2,264us-gaap_IncreaseDecreaseInInventories 864us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets 834us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 2,324us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued liabilities (12,726)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (11,689)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred taxes and income taxes payable 2,664us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable 2,374us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable
Deferred income (586)us-gaap_IncreaseDecreaseInDeferredRevenue (1,921)us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash provided by operating activities 8,035us-gaap_NetCashProvidedByUsedInOperatingActivities 10,609us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Purchases of property and equipment (4,414)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,732)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of intangible assets (441)us-gaap_PaymentsToAcquireIntangibleAssets (481)us-gaap_PaymentsToAcquireIntangibleAssets
Redemption of short-term investments 7,926us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity 1,800us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
Disposals of investment securities and other investments 15,429us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 14,064us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Purchases of investment securities and other investments (35,329)us-gaap_PaymentsToAcquireMarketableSecurities (17,790)us-gaap_PaymentsToAcquireMarketableSecurities
Net cash used in investing activities (16,829)us-gaap_NetCashProvidedByUsedInInvestingActivities (6,139)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Cash paid in connection with business acquisition (18,000)us-gaap_PaymentsOfMergerRelatedCostsFinancingActivities  
Proceeds from credit facility 30,000us-gaap_ProceedsFromShortTermDebt 30,000us-gaap_ProceedsFromShortTermDebt
Repayment of credit facility (20,000)us-gaap_RepaymentsOfShortTermDebt (55,000)us-gaap_RepaymentsOfShortTermDebt
Proceeds from issuance of common stock 26,759us-gaap_ProceedsFromIssuanceOfCommonStock 9,348us-gaap_ProceedsFromIssuanceOfCommonStock
Repurchases of common stock (57,222)us-gaap_PaymentsForRepurchaseOfCommonStock (11,496)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash used in financing activities (38,463)us-gaap_NetCashProvidedByUsedInFinancingActivities (27,148)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (765)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (432)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net decrease in cash and cash equivalents (48,022)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (23,110)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 112,570us-gaap_CashAndCashEquivalentsAtCarryingValue 100,038us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 64,548us-gaap_CashAndCashEquivalentsAtCarryingValue 76,928us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of cash flow information:    
Cash paid for interest 101us-gaap_InterestPaidNet 198us-gaap_InterestPaidNet
Cash (payments) refunds received for income taxes, net $ (69)us-gaap_IncomeTaxesPaidNet $ 654us-gaap_IncomeTaxesPaidNet