0000001 - Document - COVER link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - OVERVIEW OF BUSINESS AND BASIS OF PRESENTATION link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING STANDARDS link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - DISCONTINUED OPERATIONS link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - GOODWILL AND ACQUIRED INTANGIBLES link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - LEASES link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - DEBT AND FINANCING ARRANGEMENTS link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - STOCK-BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - EARNINGS PER SHARE link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - SEGMENTS link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING STANDARDS (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - DISCONTINUED OPERATIONS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - GOODWILL AND ACQUIRED INTANGIBLES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - LEASES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - DEBT AND FINANCING ARRANGEMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - STOCK-BASED COMPENSATION (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - EARNINGS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - SEGMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - OVERVIEW OF BUSINESS AND BASIS OF PRESENTATION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - DISCONTINUED OPERATIONS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - DISCONTINUED OPERATIONS - Schedule of Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - DISCONTINUED OPERATIONS - Balance Sheet (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - DISCONTINUED OPERATIONS - Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - DISCONTINUED OPERATIONS - Cash Flows (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - GOODWILL AND ACQUIRED INTANGIBLES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - GOODWILL AND ACQUIRED INTANGIBLES - Changes in Carrying Amount of Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - REVENUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - REVENUE - Summary of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - LEASES (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - DEBT AND FINANCING ARRANGEMENTS - Summary of Debt (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - DEBT AND FINANCING ARRANGEMENTS - Debt (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - DEBT AND FINANCING ARRANGEMENTS - 2024 Convertible Senior Notes (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - DEBT AND FINANCING ARRANGEMENTS - Net Carrying Amount of Liability Component (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - DEBT AND FINANCING ARRANGEMENTS - Interest Expense Recognized (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - DEBT AND FINANCING ARRANGEMENTS - 2018 Loan Facility (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - STOCK-BASED COMPENSATION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - STOCK-BASED COMPENSATION - Allocation of Stock-based Compensation (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - STOCK-BASED COMPENSATION - Summary of RSU Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - FAIR VALUE MEASUREMENTS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - FAIR VALUE MEASUREMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - COMMITMENTS AND CONTINGENCIES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - EARNINGS PER SHARE - Schedule of antidilutive securities (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - SEGMENTS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - SEGMENTS - Revenue by Segment (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - SEGMENTS - Adjusted Contribution Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - SEGMENTS - Geographical Information (Details) link:presentationLink link:calculationLink link:definitionLink