Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Title of 12(b) Security Title of 12(b) Security Numerator for diluted EPS Net Income (Loss) Available to Common Stockholders, Diluted Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Expected timing of satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Litigation settlement loss Litigation Settlement, Loss Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Segment Reporting [Abstract] Common stock, 400,000 shares authorized; 163,580 and 170,347 shares issued and outstanding at September 30, 2026 and December 31, 2025, respectively Common Stock, Value, Issued Common stock repurchases for tax withholdings for net settlement of equity awards Payment, Tax Withholding, Share-Based Payment Arrangement Employee related Employee-related Liabilities, Current Derivative Litigation Derivative Litigation [Member] Derivative Litigation Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Privately Held Investment Privately Held Investment [Member] Privately Held Investment Revenue recognized over time Transferred over Time [Member] Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Total contract assets Contract with Customer, Asset, after Allowance for Credit Loss Earnings Per Share [Table] Earnings Per Share [Table] Earnings Per Share Schedule of Effective Income Tax Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Subscription license Subscription License [Member] Subscription License Accused Marketing And Sales Activities Accused Marketing And Sales Activities [Member] Accused Marketing And Sales Activities Schedule of Impairment of Deferred Commissions Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Long-term unbilled receivables, net Long-term unbilled receivables, net Unbilled Receivables Non Current Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due greater than one year from period end. Amendment Flag Amendment Flag Current liabilities: Liabilities, Current [Abstract] Shares repurchased, average price per share (in dollars per share) Shares Acquired, Average Cost Per Share Other Other Sundry Liabilities, Current Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 2024 Unbilled Receivables, Not Billable, Contract Date, Year Two Unbilled Receivables, Not Billable, Contract Date, Year Two Marketable Securities [Line Items] Marketable Securities [Line Items] Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Loss Contingencies [Table] Loss Contingencies [Table] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Other Accounts Payable, Other, Current 2025 Unbilled Receivables, Not Billable, Contract Date, Year One Unbilled Receivables, Not Billable, Contract Date, Year One Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Non-qualified stock options (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent PEO Total Compensation Amount PEO Total Compensation Amount 2023 Unbilled Receivables, Not Billable, Contract Date, Year Three Unbilled Receivables, Not Billable, Contract Date, Year Three Fair Value Assets Assets, Fair Value Disclosure [Abstract] Basic (in shares) Weighted-average common shares outstanding Weighted Average Number of Shares Outstanding, Basic Contract assets Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current (Accretion) of investments Accretion (Amortization) of Discounts and Premiums, Investments Schedule of Stock-Based Compensation Expense Grants Share-Based Payment Arrangement, Activity [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Notes - interest expense, net of tax Dilutive Securities, Effect on EPS Numerator, Convertible Debt Dilutive Securities, Effect on EPS Numerator, Convertible Debt Pega Cloud Pega Cloud [Member] Cloud [Member] Europe (excluding U.K.), Middle East, and Africa EMEA [Member] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Entity Address, City or Town Entity Address, City or Town Pending Litigation Pending Litigation [Member] Quantity (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Receivables [Abstract] Receivables [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Judicial Ruling Judicial Ruling [Member] 2026 Percentage of Unbilled Receivables, Not Billable, Amount Expected to be Collected in Remainder of Fiscal Year Percentage of Unbilled Receivables, Not Billable, Amount Expected to be Collected in Remainder of Fiscal Year Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of presentation Basis of Accounting, Policy [Policy Text Block] Subscription Subscription [Member] Subscription [Member] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Proceeds from employee stock plans Proceeds from Stock Plans Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] 2022 and prior Unbilled Receivables, Not Billable, Contract Date, Year Four and Prior Unbilled Receivables, Not Billable, Contract Date, Year Four and Prior Increase in aggregate commitment amount Line of Credit Facility, Maximum Borrowing Capacity Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Revenue Benchmark Revenue Benchmark [Member] U.S. UNITED STATES Subsequent Event Type [Axis] Subsequent Event Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Class Action, Case 12999 and Case 11220 Class Action, Case 12999 and Case 11220 [Member] Class Action, Case 12999 and Case 11220 New accounting pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Litigation Case [Axis] Litigation Case [Axis] Investment in property and equipment included in accounts payable and accrued liabilities Capital Expenditures Incurred but Not yet Paid Schedule of Information of Operation Income (Expense) Segment Reporting [Table Text Block] Unbilled revenue total Unbilled Revenue Total Unbilled Revenue Total Total other comprehensive (loss) income, net of tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Disgorge of Company Profits Disgorge of Company Profits [Member] Disgorge of Company Profits Litigation settlements Estimated Litigation Liability, Current Repurchase of common stock Stock Repurchased and Retired During Period, Value, Excluding Excise Tax Stock Repurchased and Retired During Period, Value, Excluding Excise Tax Document Period End Date Document Period End Date Cash provided by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Basic Earnings Per Share, Basic [Abstract] Security Exchange Name Security Exchange Name Long-term deferred revenue Deferred Credits and Other Liabilities, Noncurrent Weighted-average number of common shares outstanding Earnings Per Share, Basic, Other Disclosure [Abstract] 2022 and prior Percentage of Unbilled Receivables, Not Billable, Contract Date, Year Four and Prior Percentage of Unbilled Receivables, Not Billable, Contract Date, Year Four and Prior Performance stock options Performance Stock Options [Member] Performance Stock Options Accumulated other comprehensive (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Long-Lived Assets by Geographical Areas [Line Items] Long-Lived Assets by Geographical Areas [Line Items] Long-Lived Assets by Geographical Areas Operating lease liabilities Operating Lease, Liability, Current Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Marketable Securities [Table] Marketable Securities [Table] EARNINGS PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings per share Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Schedule of Contract Assets and Deferred Revenue Contract assets and deferred revenue [Table Text Block] Contract assets and deferred revenue [Table Text Block]. Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total Unbilled Receivables Current and Non Current Unbilled Receivables Current and Non Current Total liabilities Liabilities Trading Symbol Trading Symbol Fair Value Marketable securities Debt Securities, Available-for-Sale, Excluding Accrued Interest Geographical [Domain] Geographical [Domain] Investment in property and equipment Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Income and other taxes Accrued Income Taxes, Current Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Weighted-average effect of dilutive securities: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Business Combination, Contingent Consideration, Type [Axis] Business Combination, Contingent Consideration, Type [Axis] Diluted Earnings Per Share, Diluted [Abstract] Non-cash investing and financing activity: Noncash Investing and Financing Items [Abstract] 2026 Unbilled Receivables, Not Billable, Contract Date, Remainder of Fiscal Year Unbilled Receivables, Not Billable, Contract Date, Remainder of Fiscal Year Case 2584CV00541-BLS1 and Case 2584CV00539-BLS1 Case No. 2584CV00541-BLS1 and Case No. 2584CV00539-BLS1 [Member] Case No. 2584CV00541-BLS1 and Case No. 2584CV00539-BLS1 Asset Class [Domain] Asset Class [Domain] Credit Facility [Domain] Credit Facility [Domain] Operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Other Other Sundry Liabilities, Noncurrent Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Long-Lived Asset [Abstract] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Long-Lived Asset [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Pegasystems v. Appian Defamation Litigation Pegasystems v. Appian Defamation Litigation [Member] Pegasystems v. Appian Defamation Litigation Dividends payable Dividends Payable, Current Individual: Individual [Axis] Minimum consolidated coverage ratio Debt Instrument, Covenant, Interest Coverage Ratio, Minimum Debt Instrument, Covenant, Interest Coverage Ratio, Minimum Diluted (in shares) Weighted-average common shares outstanding, assuming dilution (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Cloud hosting Accrued Cloud Hosting, Current Accrued Cloud Hosting, Current Underlying Security Market Price Change Underlying Security Market Price Change, Percent Cash borrowings Proceeds from Lines of Credit Vesting rights percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Gross profit Gross Profit Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Effect of dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Schedule of Changes in Venture Investments Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Cost of revenue Cost of Revenue [Abstract] Award Timing Predetermined Award Timing Predetermined [Flag] Restricted cash included in other current assets Restricted cash Restricted Cash, Current Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Outstanding letters of credit Letters of Credit Outstanding, Amount Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Fair Value, Inputs, Level 1 [Member] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Litigation Status [Domain] Litigation Status [Domain] Stock options and RSUs (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements All Executive Categories All Executive Categories [Member] Repurchase of common stock Stock Repurchased and Retired During Period, Value Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Total Fair Value Share Based Compensation Arrangement By Share Based Payment Award Grant Date Fair Value Of Awards The total grant date fair value of awards made during the period. Accused Pega Platform Revisions Accused Pega Platform Revisions [Member] Accused Pega Platform Revisions Plan Name [Domain] Plan Name [Domain] Right of use assets Operating Lease, Right-of-Use Asset Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract] Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract] Selling and marketing Selling and Marketing Expense Concentration Risk Type [Domain] Concentration Risk Type [Domain] 2025 Percentage of Unbilled Receivables, Not Billable, Contract Date, Year One Percentage of Unbilled Receivables, Not Billable, Contract Date, Year One Schedule of Calculation of Earnings (Loss) Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] SEGMENT INFORMATION Segment Reporting [Text Block] MARKETABLE SECURITIES Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Proceeds from maturities and called investments Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Dividend payments to stockholders Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Venture investments Investments, Fair Value Disclosure Schedule of Revenue Streams Disaggregation of Revenue [Table Text Block] Effect of exchange rate changes on cash, cash equivalents, and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement Location [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] 2024 Percentage of Unbilled Receivables, Not Billable, Contract Date, Year Two Percentage of Unbilled Receivables, Not Billable, Contract Date, Year Two Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Unbilled receivables, net Unbilled Receivables, Current Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Exercise Price Award Exercise Price Schedule of Restructuring and Related Costs [Table] Restructuring Cost [Table] Investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Litigation Status [Axis] Litigation Status [Axis] Office space reductions Facility Closing [Member] Segment Reporting [Line Items] Segment Reporting [Line Items] Unrecognized stock-based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Credit Agreement Credit Agreement [Member] Credit Agreement [Member] Total percentage of unbilled receivables Unbilled Receivables Current And Non Current Percentage Unbilled receivables current and non current percentage. Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Settled Litigation Settled Litigation [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Lender Name [Axis] Lender Name [Axis] Schedule of Long-Lived Assets by Geographic Area Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Long-Lived Asset [Table Text Block] Sales of investments Proceeds from Sale of Debt Securities, Available-for-Sale DEBT Debt Disclosure [Text Block] Long-term contract assets Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Other Assets and Liabilities [Abstract] Other Assets and Liabilities included in other comprehensive income Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Fair Value Adjustment Included In Other Comprehensive Income (Loss) Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Fair Value Adjustment Included In Other Comprehensive Income (Loss) Schedule of Restructuring Activities and Accrued Employee Severance and Related Benefits Restructuring and Related Costs [Table Text Block] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Beginning balance Ending balance Restructuring Reserve Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Other Americas Other Americas [Member] Region of Americas, except US. Adoption Date Trading Arrangement Adoption Date Schedule of Unbilled Receivables Schedule of Unbilled Receivables Not Billable At Balance Sheet Date[Table Text Block] Schedule of unbilled receivables not billable at balance sheet date. Cash dividends declared Dividends, Common Stock, Cash Total stockholders’ equity Balance, beginning of period Balance, end of period Equity, Attributable to Parent Restructuring Type [Axis] Restructuring Type [Axis] Assets Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Other current liabilities Other Liabilities, Current [Abstract] Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Loss contingency, damages claim dismissed Loss Contingency, Damages Dismissed, Value Loss Contingency, Damages Dismissed, Value Insider Trading Policies and Procedures [Line Items] Other Other, Long-term Assets Other, Long-term Assets Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Loss contingency, damages awarded, value Loss Contingency, Damages Awarded, Value Income taxes payable Accrued Income Taxes, Noncurrent Deferred income taxes Deferred Income Tax Expense (Benefit) OTHER ASSETS AND LIABILITIES Supplemental Balance Sheet Disclosures [Text Block] Type of Restructuring [Domain] Type of Restructuring [Domain] Letter of Credit Letter of Credit [Member] Percentage of unbilled receivables, 1-2 years Unbilled Receivables Not Billable At Balance Sheet Date Expected Percentage To Be Collected Within Year One And Two Unbilled receivables not billable at balance sheet date expected percentage to be collected within year one and two. COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Indirect tax receivable Indirect Tax Receivable, Current Indirect Tax Receivable, Current Outstanding anti-dilutive stock options and RSUs (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Number of operating segments Number of Operating Segments Restricted stock units RSUs Restricted Stock Units (RSUs) [Member] Marketing and sales program Accrued Marketing Costs, Current Schedule of Goodwill Goodwill [Table Text Block] Entity Central Index Key Entity Central Index Key Additional paid-in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Revenue remaining performance obligation, percentage Revenue, Remaining Performance Obligation, Percentage Income Statement [Abstract] Income Statement [Abstract] Stockholders’ equity: Equity, Attributable to Parent [Abstract] Issuance of common stock under the employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Loss (gain) on investments Gain (Loss) on Investments Operating expenses Operating Expenses [Abstract] Long-term deferred income taxes Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] City Area Code City Area Code Marketing Marketing Expense Accumulated other comprehensive (loss) AOCI Attributable to Parent [Member] Geographic Concentration Risk Geographic Concentration Risk [Member] All Individuals All Individuals [Member] Schedule of Geographic Revenue Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block] Long-lived assets percentage Long Lived Assets Percentage Long-lived assets as a percentage of total long-lived assets. Name Forgone Recovery, Individual Name Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Weighted-average period of recognition of unrecognized stock-based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year or less Unbilled Receivables Not Billable At Balance Sheet Date Amount Expected to be Collected Within Year One Or Less Unbilled Receivables Not Billable At Balance Sheet Date Amount Expected to be Collected Within Year One Or Less Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] 2-5 years Unbilled Receivables Not Billable At Balance Sheet Date Amount Expected to be Collected Within Year Two And Five Unbilled receivables not billable at balance sheet date amount expected to be collected within year two and five. Statement [Line Items] Statement [Line Items] Total assets Assets Other long-term liabilities Other Liabilities, Noncurrent [Abstract] Interest income Investment Income, Net Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Notes Convertible Debt [Member] Interest expense Interest Expense, Nonoperating Schedule of Stock-Based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax STOCKHOLDERS' EQUITY Share-Based Payment Arrangement [Text Block] Issuance of common stock under the employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] PEO PEO [Member] Repurchase of common stock (in shares) Repurchase of common stock (in shares) Stock Repurchased and Retired During Period, Shares Marketable securities Marketable Securities, Current Cash equivalents Cash Equivalents [Member] Other long-term liabilities Other long-term liabilities Other Liabilities, Noncurrent Goodwill Beginning balance Ending balance Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Revenue recognized during the period that was included in deferred revenue Contract with Customer, Liability, Revenue Recognized Subsequent Event Type [Domain] Subsequent Event Type [Domain] Retained earnings Retained Earnings [Member] Long-term operating lease liabilities Operating Lease, Liability, Noncurrent Total operating expenses Operating Expenses Revolving Credit Facility Revolving Credit Facility [Member] Assets and liabilities measured at fair value on a recurring basis Fair Value Measurement, Policy [Policy Text Block] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Unrealized (loss) gain on available-for-sale securities OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Common stock, shares outstanding (in shares) Balance, beginning of period (in shares) Balance, end of period (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Changes in fair value: Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss) [Abstract] Corporate debt Corporate Debt Securities [Member] Diluted (in dollars per share) Earnings per share, diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Cash (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Change in operating assets and liabilities, net Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital Other long-term assets Other Assets, Noncurrent [Abstract] Litigation Case [Domain] Litigation Case [Domain] Research and development Research and Development Expense Adjustments to reconcile net income to cash provided by operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Lost Profits of Third Party Lost Profits of Third Party [Member] Lost Profits of Third Party Appian Corp. v. Pegasystems Inc. & Youyong Zou Appian Corp. v. Pegasystems Inc. & Youyong Zou [Member] Appian Corp. v. Pegasystems Inc. & Youyong Zou Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-Based Payment Arrangement [Abstract] Property and equipment Long-lived assets Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Total revenue Revenue from Contract with Customer, Excluding Assessed Tax Marketable securities weighted-average remaining maturity Debt Securities, Available-for-Sale, Term Financial Instruments [Domain] Financial Instruments [Domain] Special Dividend to Shareholders Special Dividend To Shareholders [Member] Special Dividend To Shareholders Subscription services Subscription Services [Member] Subscription Services Other current assets Other Assets, Current [Abstract] Other Assets, Current Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] GOODWILL Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount REVENUE Revenue from Contract with Customer [Text Block] Prepaid expenses Prepaid Expense, Current Violation of the Virginia Computer Crimes Act Violation of the Virginia Computer Crimes Act [Member] Violation of the Virginia Computer Crimes Act Sales of investments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Earnings Per Share [Line Items] Earnings Per Share [Line Items] Earnings Per Share Segment Reporting [Table] Segment Reporting [Table] Schedule of Marketable Securities Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Other current assets Other current assets Other Assets, Current Percentage of unbilled receivables, 2-5 years Unbilled Receivables Not Billable At Balance Sheet Date Expected Percentage To Be Collected Within Year Two And Five Unbilled receivables not billable at balance sheet date expected percentage to be collected within year two and five. Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Income from operations Operating Income (Loss) Revenue remaining performance obligation Revenue, Remaining Performance Obligation, Amount Asia-Pacific Asia Pacific [Member] Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Cash dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Issuance of common stock for stock compensation plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Schedule of Unbilled Receivables by Contract Effective Date Summary of Unbilled Receivables Based Upon Contract Effective Date [Table Text Block] Summary of Unbilled Receivables Based Upon Contract Effective Date Non-qualified stock options Nonqualified Stock Options [Member] Nonqualified Stock Options [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Senior notes Senior Notes Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value BASIS OF PRESENTATION Business Description and Basis of Presentation [Text Block] PNC Bank, National Association PNC Bank, National Association [Member] PNC Bank, National Association [Member] Equity Components [Axis] Equity Components [Axis] Deferred commissions Deferred commissions Deferred Costs, Noncurrent Product and Service [Domain] Product and Service [Domain] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Gain contingency, litigation damages claimed Gain Contingency, Unrecorded Amount Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Changes in foreign exchange rates Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Currency Translation Adjustment Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Changes in Foreign Exchange Rates Entity Small Business Entity Small Business Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other current liabilities Other current liabilities Other Liabilities, Current Expiration term Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Other long-term assets Other long-term assets Other Assets, Noncurrent Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Accrued expenses Accrued expenses Accrued 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