0000001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - Consolidated Balance Sheets (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - Consolidated Balance Sheets (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - Consolidated Statements of Operations (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - Consolidated Statements of Comprehensive Loss (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - Consolidated Statements of Comprehensive Loss (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952157 - Statement - Consolidated Statements of Cash Flows (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - DESCRIPTION OF BUSINESS link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - FAIR VALUE MEASUREMENT link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - ASSET HELD FOR SALE link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - PROPERTY AND EQUIPMENT, NET link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - INTANGIBLE ASSETS, NET link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - EQUITY SECURITIES link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - BORROWINGS link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - LEASES link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - INDEMNIFICATIONS AND GUARANTEES link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - STOCK-BASED AWARDS link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - REVENUE AND CONTRACT LIABILITY link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - NET LOSS PER SHARE link:presentationLink link:calculationLink link:definitionLink 9954471 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 9954472 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9954473 - Disclosure - FAIR VALUE MEASUREMENT (Tables) link:presentationLink link:calculationLink link:definitionLink 9954474 - Disclosure - PROPERTY AND EQUIPMENT, NET (Tables) link:presentationLink link:calculationLink link:definitionLink 9954475 - Disclosure - INTANGIBLES ASSETS, NET (Tables) link:presentationLink link:calculationLink link:definitionLink 9954476 - Disclosure - EQUITY SECURITIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9954477 - Disclosure - LEASES (Tables) link:presentationLink link:calculationLink link:definitionLink 9954478 - Disclosure - STOCK-BASED AWARDS (Tables) link:presentationLink link:calculationLink link:definitionLink 9954479 - Disclosure - REVENUE AND CONTRACT LIABILITY (Tables) link:presentationLink link:calculationLink link:definitionLink 9954480 - Disclosure - NET LOSS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 9954481 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change In Presentation In The Income Statement (Details) link:presentationLink link:calculationLink link:definitionLink 9954482 - Disclosure - FAIR VALUE MEASUREMENT - Assets and Liabilities Measured At Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9954483 - Disclosure - FAIR VALUE MEASUREMENT - Level 3 Investment Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9954484 - Disclosure - PROPERTY AND EQUIPMENT, NET (Details) link:presentationLink link:calculationLink link:definitionLink 9954485 - Disclosure - PROPERTY AND EQUIPMENT, NET - Capitalized Software & Website Development (Details) link:presentationLink link:calculationLink link:definitionLink 9954486 - Disclosure - PROPERTY AND EQUIPMENT, NET - Depreciation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954487 - Disclosure - INTANGIBLE ASSETS, NET - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954488 - Disclosure - INTANGIBLE ASSETS, NET - Schedule of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954489 - Disclosure - EQUITY SECURITIES - Summary Of Equity Securities (Details) link:presentationLink link:calculationLink link:definitionLink 9954490 - Disclosure - EQUITY SECURITIES - Equity Securities Accounted Under ASC 323 And Ownership Interest (Details) link:presentationLink link:calculationLink link:definitionLink 9954491 - Disclosure - EQUITY SECURITIES (Details) - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954492 - Disclosure - EQUITY SECURITIES - Net Gain (Loss) Recognized On Equity Method Securities (Details) link:presentationLink link:calculationLink link:definitionLink 9954493 - Disclosure - EQUITY SECURITIES - Equity Method Securities That Are Considered Significant Subsidiaries (Details) link:presentationLink link:calculationLink link:definitionLink 9954494 - Disclosure - BORROWINGS (Details) link:presentationLink link:calculationLink link:definitionLink 9954495 - Disclosure - LEASES - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954496 - Disclosure - LEASES - Components of Lease Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954497 - Disclosure - LEASES - Other Information Related To Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9954498 - Disclosure - LEASES - Supplemental Balance Sheet Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954499 - Disclosure - LEASES - Operating Lease Maturities and Future Minimum Payments (Details) link:presentationLink link:calculationLink link:definitionLink 9954499 - Disclosure - LEASES - Operating Lease Maturities and Future Minimum Payments (Details) link:presentationLink link:calculationLink link:definitionLink 9954500 - Disclosure - STOCKHOLDERS' EQUITY - Common Stock (Details) link:presentationLink link:calculationLink link:definitionLink 9954501 - Disclosure - STOCKHOLDERS' EQUITY - JonesTrading (Details) link:presentationLink link:calculationLink link:definitionLink 9954502 - Disclosure - STOCKHOLDERS' EQUITY - Stock Repurchase Program (Details) link:presentationLink link:calculationLink link:definitionLink 9954503 - Disclosure - STOCK-BASED AWARDS - Stock-based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954504 - Disclosure - STOCK-BASED AWARDS - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954505 - Disclosure - STOCK-BASED AWARDS - Restricted stock unit, PSU, and Performance Share Option Award Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9954506 - Disclosure - REVENUE AND CONTRACT LIABILITY - Deferred Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9954507 - Disclosure - REVENUE AND CONTRACT LIABILITY - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954508 - Disclosure - REVENUE AND CONTRACT LIABILITY - Sales Returns Allowance (Details) link:presentationLink link:calculationLink link:definitionLink 9954509 - Disclosure - NET LOSS PER SHARE - Income & Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9954510 - Disclosure - NET LOSS PER SHARE - Antidilutive Securities (Details) link:presentationLink link:calculationLink link:definitionLink