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Consolidated Statements of Operations and Comprehensive Income (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues:      
Design-to-silicon-yield solutions $ 52,769,000us-gaap_LicenseAndServicesRevenue $ 61,710,000us-gaap_LicenseAndServicesRevenue $ 59,061,000us-gaap_LicenseAndServicesRevenue
Gainshare performance incentives 47,394,000pdfs_GainsharePerformanceIncentives 39,743,000pdfs_GainsharePerformanceIncentives 30,479,000pdfs_GainsharePerformanceIncentives
Total revenues 100,163,000us-gaap_Revenues 101,453,000us-gaap_Revenues 89,540,000us-gaap_Revenues
Cost of Design-to-silicon-yield solutions:      
Direct costs of Design-to-silicon-yield solutions 37,822,000us-gaap_CostOfServicesLicensesAndServices 39,470,000us-gaap_CostOfServicesLicensesAndServices 36,236,000us-gaap_CostOfServicesLicensesAndServices
Impairment of deferred cost 1,892,000pdfs_ImpairmentOfDeferredCosts    
Amortization of acquired technology     261,000us-gaap_CostOfGoodsSoldAmortization
Total cost of Design-to-silicon-yield solutions 39,714,000us-gaap_CostOfRevenue 39,470,000us-gaap_CostOfRevenue 36,497,000us-gaap_CostOfRevenue
Gross profit 60,449,000us-gaap_GrossProfit 61,983,000us-gaap_GrossProfit 53,043,000us-gaap_GrossProfit
Operating expenses:      
Research and development 14,064,000us-gaap_ResearchAndDevelopmentExpense 13,314,000us-gaap_ResearchAndDevelopmentExpense 13,251,000us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 18,457,000us-gaap_SellingGeneralAndAdministrativeExpense 17,025,000us-gaap_SellingGeneralAndAdministrativeExpense 18,599,000us-gaap_SellingGeneralAndAdministrativeExpense
Amortization of other acquired intangible assets 31,000pdfs_AmortizationOfOtherAcquiredIntangibleAssets 74,000pdfs_AmortizationOfOtherAcquiredIntangibleAssets 174,000pdfs_AmortizationOfOtherAcquiredIntangibleAssets
Restructuring charges 57,000us-gaap_RestructuringCharges 197,000us-gaap_RestructuringCharges 1,889,000us-gaap_RestructuringCharges
Total operating expenses 32,609,000us-gaap_OperatingExpenses 30,610,000us-gaap_OperatingExpenses 33,913,000us-gaap_OperatingExpenses
Income from operations 27,840,000us-gaap_OperatingIncomeLoss 31,373,000us-gaap_OperatingIncomeLoss 19,130,000us-gaap_OperatingIncomeLoss
Interest and other income (expense), net 119,000us-gaap_NonoperatingIncomeExpense (64,000)us-gaap_NonoperatingIncomeExpense (248,000)us-gaap_NonoperatingIncomeExpense
Income before taxes 27,959,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 31,309,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 18,882,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax provision (benefit) 9,497,000us-gaap_IncomeTaxExpenseBenefit 10,380,000us-gaap_IncomeTaxExpenseBenefit (18,329,000)us-gaap_IncomeTaxExpenseBenefit
Net income 18,462,000us-gaap_NetIncomeLoss 20,929,000us-gaap_NetIncomeLoss 37,211,000us-gaap_NetIncomeLoss
Other comprehensive income:      
Foreign currency translation adjustments, net of tax (1,129,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent 397,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent 134,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Reclassification adjustment for other-than-temporary impairment on auction-rate-securities recognized in earnings, net of tax     216,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Net income per share      
Basic (in Dollars per share) $ 0.60us-gaap_EarningsPerShareBasic $ 0.70us-gaap_EarningsPerShareBasic $ 1.30us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share) $ 0.58us-gaap_EarningsPerShareDiluted $ 0.67us-gaap_EarningsPerShareDiluted $ 1.25us-gaap_EarningsPerShareDiluted
Weighted average common shares      
Basic (in Shares) 30,743us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 29,826us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 28,700us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in Shares) 31,939us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 31,393us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 29,809us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income 18,462,000us-gaap_NetIncomeLoss 20,929,000us-gaap_NetIncomeLoss 37,211,000us-gaap_NetIncomeLoss
Other comprehensive income:      
Foreign currency translation adjustments, net of tax (1,129,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent 397,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent 134,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Reclassification adjustment for other-than-temporary impairment on auction-rate-securities recognized in earnings, net of tax     216,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Comprehensive income $ 17,333,000us-gaap_ComprehensiveIncomeNetOfTax $ 21,326,000us-gaap_ComprehensiveIncomeNetOfTax $ 37,561,000us-gaap_ComprehensiveIncomeNetOfTax