99900 - Disclosure - Standard And Custom Axis Domain Defaults link:presentationLink link:calculationLink link:definitionLink 995200100 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 995200200 - Statement - Condensed Consolidated Statements of Comprehensive Income (Loss) link:presentationLink link:calculationLink link:definitionLink 995200400 - Statement - Condensed Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 995200405 - Statement - Condensed Consolidated Statements of Cash Flows (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 99940103 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Software Development Costs and Supplemental Balance Sheet Disclosures (Details) link:presentationLink link:calculationLink link:definitionLink 99940303 - Disclosure - ACQUISITIONS - Net assets and liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 99940501 - Disclosure - PROPERTY AND EQUIPMENT (Details) link:presentationLink link:calculationLink link:definitionLink 99940503 - Disclosure - PROPERTY AND EQUIPMENT - Major components of internal-use software (Details) link:presentationLink link:calculationLink link:definitionLink 99940701 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Details) link:presentationLink link:calculationLink link:definitionLink 99940802 - Disclosure - DEBT - Indebtedness (Details) link:presentationLink link:calculationLink link:definitionLink 99940803 - Disclosure - DEBT - Interest expense related to Notes (Details) link:presentationLink link:calculationLink link:definitionLink 995200090 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 995200105 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 995200300 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 99930303 - Disclosure - ACQUISITIONS (Tables) link:presentationLink link:calculationLink link:definitionLink 99930403 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 99930603 - Disclosure - CAPITALIZED SOFTWARE (Tables) link:presentationLink link:calculationLink link:definitionLink 99931003 - Disclosure - EARNINGS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 99931103 - Disclosure - STOCK-BASED AWARD PLANS (Tables) link:presentationLink link:calculationLink link:definitionLink 99940101 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) link:presentationLink link:calculationLink link:definitionLink 99940102 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) link:presentationLink link:calculationLink link:definitionLink 99940201 - Disclosure - REVENUE RECOGNITION - Disaggregation of revenue (Details) link:presentationLink link:calculationLink link:definitionLink 99940202 - Disclosure - REVENUE RECOGNITION - Accounts receivable, net (Details) link:presentationLink link:calculationLink link:definitionLink 99940203 - Disclosure - REVENUE RECOGNITION - Allowance and deferred allowance (Details) link:presentationLink link:calculationLink link:definitionLink 99940301 - Disclosure - ACQUISITIONS - Ecosio GmbH (Details) link:presentationLink link:calculationLink link:definitionLink 99940302 - Disclosure - ACQUISITIONS - Purchase price (Details) link:presentationLink link:calculationLink link:definitionLink 99940304 - Disclosure - ACQUISITIONS - Intangible assets acquired (Details) link:presentationLink link:calculationLink link:definitionLink 99940305 - Disclosure - ACQUISITIONS - Asset acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 99940401 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Financial assets and liabilities measured at fair value (Details) link:presentationLink link:calculationLink link:definitionLink 99940402 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Earn out consideration (Details) link:presentationLink link:calculationLink link:definitionLink 99940403 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Fair value of Cash and Stock Earn-outs (Details) link:presentationLink link:calculationLink link:definitionLink 99940404 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Estimated fair values of Tellutax contingent consideration (Details) link:presentationLink link:calculationLink link:definitionLink 99940405 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Changes in fair value of contingent consideration (Details) link:presentationLink link:calculationLink link:definitionLink 99940406 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Non-recurring Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 99940502 - Disclosure - PROPERTY AND EQUIPMENT - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 99940504 - Disclosure - PROPERTY AND EQUIPMENT - Amounts included in property and equipment additions related to capitalized internal-use software (Details) link:presentationLink link:calculationLink link:definitionLink 99940601 - Disclosure - CAPITALIZED SOFTWARE (Details) link:presentationLink link:calculationLink link:definitionLink 99940702 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Changes (Details) link:presentationLink link:calculationLink link:definitionLink 99940703 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Intangibles (Details) link:presentationLink link:calculationLink link:definitionLink 99940801 - Disclosure - DEBT - Credit Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 99940901 - Disclosure - STOCKHOLDERS EQUITY (Details) link:presentationLink link:calculationLink link:definitionLink 99941001 - Disclosure - EARNINGS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 99941002 - Disclosure - EARNINGS PER SHARE - weighted- Average outstanding shares of common stock equivalents (Details) link:presentationLink link:calculationLink link:definitionLink 99941101 - Disclosure - STOCK-BASED AWARD PLANS - 2020 Plan (Details) link:presentationLink link:calculationLink link:definitionLink 99941102 - Disclosure - STOCK-BASED AWARD PLANS - Options under 2020 Plan (Details) link:presentationLink link:calculationLink link:definitionLink 99941103 - Disclosure - STOCK-BASED AWARD PLANS - Options under 2020 Plan Price Range (Details) link:presentationLink link:calculationLink link:definitionLink 99941104 - Disclosure - STOCK-BASED AWARD PLANS - Restricted Stock Units (Details) link:presentationLink link:calculationLink link:definitionLink 99941105 - Disclosure - STOCK-BASED AWARD PLANS - Restricted Stock Awards (Details) link:presentationLink link:calculationLink link:definitionLink 99941106 - Disclosure - STOCK-BASED AWARD PLANS - Employee Stock Purchase Plan (Details) link:presentationLink link:calculationLink link:definitionLink 99941107 - Disclosure - STOCK-BASED AWARD PLANS - ESPP - Option-pricing model key input assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 99941108 - Disclosure - STOCK-BASED AWARD PLANS - Stock based compensation (Details) link:presentationLink link:calculationLink link:definitionLink 99941109 - Disclosure - STOCK-BASED AWARD PLANS - Stock based compensation, comprehensive loss (Details) link:presentationLink link:calculationLink link:definitionLink 99941401 - Disclosure - SUBSEQUENT EVENTS (Details) link:presentationLink link:calculationLink link:definitionLink 995210101 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 995210201 - Disclosure - REVENUE RECOGNITION link:presentationLink link:calculationLink link:definitionLink 995210301 - Disclosure - ACQUISITIONS link:presentationLink link:calculationLink link:definitionLink 995210401 - Disclosure - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 995210501 - Disclosure - PROPERTY AND EQUIPMENT link:presentationLink link:calculationLink link:definitionLink 995210601 - Disclosure - CAPITALIZED SOFTWARE link:presentationLink link:calculationLink link:definitionLink 995210701 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS link:presentationLink link:calculationLink link:definitionLink 995210801 - Disclosure - DEBT link:presentationLink link:calculationLink link:definitionLink 995210901 - Disclosure - STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 995211001 - Disclosure - EARNINGS PER SHARE link:presentationLink link:calculationLink link:definitionLink 995211101 - Disclosure - STOCK-BASED AWARD PLANS link:presentationLink link:calculationLink link:definitionLink 995211201 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 995211301 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 995211401 - Disclosure - SUBSEQUENT EVENTS link:presentationLink link:calculationLink link:definitionLink 99920102 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 99930103 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 99930203 - Disclosure - REVENUE RECOGNITION (Tables) link:presentationLink link:calculationLink link:definitionLink 99930503 - Disclosure - PROPERTY AND EQUIPMENT (Tables) link:presentationLink link:calculationLink link:definitionLink 99930703 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) link:presentationLink link:calculationLink link:definitionLink 99930803 - Disclosure - DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 99940204 - Disclosure - REVENUE RECOGNITION - Changes to deferred revenue (Details) link:presentationLink link:calculationLink link:definitionLink 99940205 - Disclosure - REVENUE RECOGNITION - Contract cost balances (Details) link:presentationLink link:calculationLink link:definitionLink 99941301 - Disclosure - INCOME TAXES - (Details) link:presentationLink link:calculationLink link:definitionLink