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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating activities:      
Net income $ 18,462,000us-gaap_NetIncomeLoss $ 20,929,000us-gaap_NetIncomeLoss $ 37,211,000us-gaap_NetIncomeLoss
Depreciation and amortization 2,010,000us-gaap_DepreciationDepletionAndAmortization 1,385,000us-gaap_DepreciationDepletionAndAmortization 515,000us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation expense 8,547,000us-gaap_ShareBasedCompensation 6,693,000us-gaap_ShareBasedCompensation 4,891,000us-gaap_ShareBasedCompensation
Impairment of deferred costs 1,892,000pdfs_ImpairmentOfDeferredCosts    
Amortization of acquired intangible assets 31,000us-gaap_AmortizationOfIntangibleAssets 74,000us-gaap_AmortizationOfIntangibleAssets 434,000us-gaap_AmortizationOfIntangibleAssets
Deferred taxes 2,886,000us-gaap_DeferredIncomeTaxExpenseBenefit 5,539,000us-gaap_DeferredIncomeTaxExpenseBenefit (20,060,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (1,577,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (1,283,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (511,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Provision for doubtful accounts 27,000us-gaap_ProvisionForDoubtfulAccounts 3,000us-gaap_ProvisionForDoubtfulAccounts 97,000us-gaap_ProvisionForDoubtfulAccounts
Unrealized loss on foreign currency forward contract 50,000us-gaap_UnrealizedGainLossOnDerivatives    
Loss (gain) on disposal of assets (242,000)us-gaap_GainLossOnDispositionOfAssets (7,000)us-gaap_GainLossOnDispositionOfAssets 45,000us-gaap_GainLossOnDispositionOfAssets
Gain on sale of investments     (50,000)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Net impairment of investments     75,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Tax benefit related to stock-based compensation expense 1,747,000pdfs_TaxBenefitRelatedToStockbasedCompensationExpense 362,000pdfs_TaxBenefitRelatedToStockbasedCompensationExpense 149,000pdfs_TaxBenefitRelatedToStockbasedCompensationExpense
Excess tax benefit from stock-based compensation expense (1,635,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (353,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (114,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Changes in operating assets and liabilities:      
Accounts receivable, net of allowances (2,892,000)us-gaap_IncreaseDecreaseInAccountsReceivable (636,000)us-gaap_IncreaseDecreaseInAccountsReceivable (12,150,000)us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses and other assets (657,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,053,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,250,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable (1,516,000)us-gaap_IncreaseDecreaseInAccountsPayable (566,000)us-gaap_IncreaseDecreaseInAccountsPayable 722,000us-gaap_IncreaseDecreaseInAccountsPayable
Accrued compensation and related benefits (1,421,000)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities (3,216,000)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities 5,669,000us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Accrued and other liabilities 7,000us-gaap_IncreaseDecreaseInAccruedLiabilities (913,000)us-gaap_IncreaseDecreaseInAccruedLiabilities 13,000us-gaap_IncreaseDecreaseInAccruedLiabilities
Deferred revenues 1,713,000us-gaap_IncreaseDecreaseInDeferredRevenue (1,131,000)us-gaap_IncreaseDecreaseInDeferredRevenue 352,000us-gaap_IncreaseDecreaseInDeferredRevenue
Billings in excess of recognized revenues (343,000)us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings (464,000)us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings (1,282,000)us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings
Net cash provided by operating activities 27,089,000us-gaap_NetCashProvidedByUsedInOperatingActivities 25,363,000us-gaap_NetCashProvidedByUsedInOperatingActivities 14,756,000us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities:      
Proceeds from the sale of investments     975,000us-gaap_ProceedsFromSaleOfShortTermInvestments
Proceeds from the sale of property and equipment 285,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment    
Purchases of property and equipment (3,958,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (4,628,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,334,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (3,673,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (4,628,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,359,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities:      
Exercise of stock options 3,225,000us-gaap_ProceedsFromStockOptionsExercised 5,339,000us-gaap_ProceedsFromStockOptionsExercised 5,527,000us-gaap_ProceedsFromStockOptionsExercised
Proceeds from employee stock purchase plan 1,437,000us-gaap_ProceedsFromStockPlans 1,317,000us-gaap_ProceedsFromStockPlans 977,000us-gaap_ProceedsFromStockPlans
Purchases of treasury stock (3,566,000)us-gaap_PaymentsForRepurchaseOfCommonStock   (4,368,000)us-gaap_PaymentsForRepurchaseOfCommonStock
Excess tax benefit from stock-based compensation expense 1,635,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 353,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 114,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash provided by financing activities 2,731,000us-gaap_NetCashProvidedByUsedInFinancingActivities 7,009,000us-gaap_NetCashProvidedByUsedInFinancingActivities 2,250,000us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (54,000)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (10,000)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (51,000)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase in cash and cash equivalents 26,093,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 27,734,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 15,596,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year 89,371,000us-gaap_CashAndCashEquivalentsAtCarryingValue 61,637,000us-gaap_CashAndCashEquivalentsAtCarryingValue 46,041,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year 115,464,000us-gaap_CashAndCashEquivalentsAtCarryingValue 89,371,000us-gaap_CashAndCashEquivalentsAtCarryingValue 61,637,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information:      
Taxes 4,222,000us-gaap_IncomeTaxesPaid 4,747,000us-gaap_IncomeTaxesPaid 1,665,000us-gaap_IncomeTaxesPaid
Property and equipment received and accrued in accounts payable and accrued and other liabilities $ 212,000pdfs_PropertyAndEquipmentReceivedAndAccruedInAccountsPayableAndAccruedAndOtherLiabilities $ 312,000pdfs_PropertyAndEquipmentReceivedAndAccruedInAccountsPayableAndAccruedAndOtherLiabilities $ 486,000pdfs_PropertyAndEquipmentReceivedAndAccruedInAccountsPayableAndAccruedAndOtherLiabilities