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Other Geographical Areas [Member] Represents other geographical areas. pdfs_BusinessCombinationRecognizedLiabilityAssumedAccountsPayableAndOtherCurrentLiabilities Accounts payable and other current liabilities Amount of accounts payable and other liabilities assumed in business combination and recognized at acquisition date, classified as current. Term Loan [Member] Represents the term loan. The Credit Facilities [Member] The name for the particular debt instrument or borrowing that distinguishes it from other debt instruments or borrowings, including draws against credit facilities. Costs of revenues Furniture and Fixtures [Member] Stock-based compensation The 2021 Purchase Plan [Member] Represents the 2021 Purchase Plan. Share-Based Compensation Arrangements by Share-Based Payment Award, Restricted Stock Units, Vested and Expected to Vest [Table Text Block] Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] The 2024 Program [Member] Represents The 2024 Stock Repurchase Program. The 2011 Plan [Member] Represents the 2011 Plan. Fair Value Disclosures [Text Block] Share-Based Payment Arrangement, Option [Member] Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Supplemental disclosure of cash flow information: Advantest [Member] Information by related and nonrelated parties. 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. Effect of dilutive stock options, unvested restricted stock units, and shares of common stock expected to be issued under employee stock purchase plan (in shares) Basic (in shares) us-gaap_WeightedAverageNumberOfSharesOutstandingBasic Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Basic (in dollars per share) Antidilutive Security, Excluded EPS Calculation [Table] Other Current Liabilities [Table Text Block] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Income Tax Jurisdiction [Axis] Addition us-gaap_GoodwillAcquiredDuringPeriod Net Carrying Amount Intangible assets, net Total future amortization expense Document Fiscal Period Focus Gross Carrying Amount Customer [Domain] Document Fiscal Year Focus us-gaap_DepreciationAndAmortization Depreciation, Depletion and Amortization, Nonproduction Amendment Flag Business Combination, Contingent Consideration [Table] Goodwill Goodwill Balance at the beginning of period Balance at the end of period Document Period End Date pdfs_IncreaseDecreaseInOperatingLeaseRightOfUseAssets Operating lease right-of-use assets The increase (decrease) during the reporting period in operating lease right-of-use assets. Long-Lived Asset, Class [Domain] Unguaranteed residual assets us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) Legal Entity [Axis] Operating lease expense us-gaap_LeaseCost Total lease expense Business Combination [Domain] Entity File Number us-gaap_RevenueRemainingPerformanceObligation Revenue, Remaining Performance Obligation, Amount Entity Tax Identification Number Supplemental disclosure of noncash information: Business Combination [Axis] Transferred over Time [Member] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] Entity [Domain] Entity Central Index Key Entity Registrant Name Entity Current Reporting Status Business Combination [Table] Entity Incorporation, State or Country Code Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Domain] Current Fiscal Year End Date Accounts receivable us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables Prepaid and other assets us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets Cash us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents Research and development Entity Filer Category Entity Shell Company Entity Emerging Growth Company Software, In-Development, Internally Developed, and Purchased [Member] Entity Small Business us-gaap_OperatingIncomeLoss Income (loss) from operations Fair value of intangible assets us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill us-gaap_BusinessCombinationAcquiredReceivablesFairValue Business Combination, Acquired Receivable, Purchased without Credit Deterioration, Fair Value Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Property and equipment us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment us-gaap_ContractWithCustomerAssetNet Total contract assets Revenues: Entity Address, State or Province Entity Address, City or Town us-gaap_InterestExpenseNonoperating Interest expense Accumulated deficit Contract assets Non-current (included in Other non-current assets) Entity Address, Address Line One Contract assets (2) Current (included in Prepaid expenses and other current assets) City Area Code us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation Payments for taxes related to net share settlement of equity awards Non-current (included in Other non-current assets) us-gaap_CapitalizedContractCostNetNoncurrent Costs capitalized to obtain revenue contracts Local Phone Number Entity Address, Postal Zip Code Revenue from Contract with Customer [Text Block] Current (included in Prepaid expenses and other current assets) us-gaap_CapitalizedContractCostNetCurrent Accrued and other liabilities us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities Title of 12(b) Security Security Exchange Name us-gaap_UnbilledReceivablesCurrent Unbilled Receivables, Current Capitalized Contract Cost [Table Text Block] Trading Symbol Capitalized Contract Cost [Table] Accrued and other current liabilities Total accrued and other current liabilities Class of Stock [Axis] Base Rate [Member] Volume-Based [Member] Information pertaining to volume-based. Platform [Member] Information pertaining to platform. Variable Rate [Axis] Variable Rate [Domain] Related Party Transaction [Domain] Amortization of costs capitalized to obtain revenue contracts us-gaap_CapitalizedContractCostImpairmentLoss Capitalized Contract Cost, Impairment Loss Entity Common Stock, Shares Outstanding Related Party Transaction [Axis] Earnings Per Share [Text Block] Other us-gaap_OtherAssetsCurrent Reclassification of Revenue [Table Text Block] Represents the tabular disclosure of the reclassification of revenue between periods. Change in unrealized loss related to available-for-sale debt securities, net of tax us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid us-gaap_CapitalizedContractCostNet Total capitalized direct sales commission costs us-gaap_BusinessCombinationAcquisitionRelatedCosts Business Combination, Acquisition-Related Cost, Expense Scenario [Axis] Scenario [Domain] Present value of lease receivables Long-term income taxes Forecast [Member] Deferred Compensation Arrangement with Individual, Share-Based Payment [Table] Weighted average common shares used to calculate net income (loss) per share: us-gaap_IncreaseDecreaseInIncomeTaxes Increase (Decrease) in Income Taxes Property, Plant, and Equipment [Table] Common stock, par value (in dollars per share) Basis of Accounting, Policy [Policy Text Block] Schedule of Other Assets, Noncurrent [Table Text Block] Previously Reported [Member] Receivable [Domain] Long-Lived Asset, Class [Axis] us-gaap_Assets Total assets Cash and cash equivalents Geographical [Domain] Geographical [Axis] us-gaap_AllowanceForDoubtfulAccountsReceivable Accounts Receivable, Allowance for Credit Loss Diluted (in dollars per share) Non-current (included in Other non-current liabilities) us-gaap_ContractWithCustomerLiability Contract with Customer, Liability Total deferred revenues Customer [Axis] Deferred revenues – current portion us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued Unrecognized Tax Benefits, Interest on Income Taxes Accrued Depreciation and amortization us-gaap_DepreciationDepletionAndAmortization Asset Class [Domain] us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation Shares withheld for taxes related to shares issued under equity plans Interim Period, Costs Not Allocable [Table] Receivable Type [Axis] Interest on long-term debt Percentage of revenue The percentage of revenue. Schedule of Long-Term Debt Instruments [Table Text Block] Intangible Asset, Finite-Lived [Table Text Block] Intangible Asset, Finite-Lived [Table] Business Combination [Text Block] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Integrated Yield Ramp [Member] Information pertaining to Integrated yield ramp. us-gaap_StockholdersEquity Total stockholders’ equity Balances Balances Deferred revenues us-gaap_IncreaseDecreaseInContractWithCustomerLiability Analytics [Member] Information pertaining to analytics. Forfeited, weighted average grant date fair value (in dollars per share) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue Goodwill [Table Text Block] us-gaap_IncreaseDecreaseInContractWithCustomerAsset Increase (Decrease) in Contract with Customer, Asset Laboratory and Test Equipment [Member] Information pertaining to laboratory and test equipment. Stock, Class of Stock [Table] Patents [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] us-gaap_FinanceLeaseRightOfUseAsset Finance Lease, Right-of-Use Asset, after Accumulated Amortization Operating lease right-of-use assets, net Sale Leaseback Transactions [Table Text Block] us-gaap_OtherLiabilitiesNoncurrent Other non-current liabilities ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] Property, Plant, and Equipment [Table Text Block] Revenues Revenue from Contract with Customer, Including Assessed Tax ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Commitments and contingencies (Note 12)