0000001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 0000002 - Statement - Consolidated Balance Sheets (Unaudited) link:presentationLink link:calculationLink link:definitionLink 0000003 - Statement - Consolidated Balance Sheets (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 0000004 - Statement - Consolidated Statements of Operations (Unaudited) link:presentationLink link:calculationLink link:definitionLink 0000005 - Statement - Consolidated Statements of Comprehensive Loss (Unaudited) link:presentationLink link:calculationLink link:definitionLink 0000006 - Statement - Consolidated Statements of Comprehensive Loss (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 0000007 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Unaudited) link:presentationLink link:calculationLink link:definitionLink 0000008 - Statement - Consolidated Statements of Cash Flows (Unaudited) link:presentationLink link:calculationLink link:definitionLink 0000009 - Disclosure - DESCRIPTION OF BUSINESS link:presentationLink link:calculationLink link:definitionLink 0000010 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - FAIR VALUE MEASUREMENT link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - PROPERTY AND EQUIPMENT, NET link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - INTANGIBLE ASSETS, NET link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - EQUITY SECURITIES link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - BORROWINGS link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - LEASES link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 0000018 - Disclosure - INDEMNIFICATIONS AND GUARANTEES link:presentationLink link:calculationLink link:definitionLink 0000019 - Disclosure - STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 0000020 - Disclosure - STOCK-BASED AWARDS link:presentationLink link:calculationLink link:definitionLink 0000021 - Disclosure - REVENUE AND CONTRACT LIABILITY link:presentationLink link:calculationLink link:definitionLink 0000022 - 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 - FAIR VALUE MEASUREMENT (Tables) link:presentationLink link:calculationLink link:definitionLink 9954473 - Disclosure - PROPERTY AND EQUIPMENT, NET (Tables) link:presentationLink link:calculationLink link:definitionLink 9954474 - Disclosure - INTANGIBLES ASSETS, NET (Tables) link:presentationLink link:calculationLink link:definitionLink 9954475 - Disclosure - EQUITY SECURITIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9954476 - Disclosure - LEASES (Tables) link:presentationLink link:calculationLink link:definitionLink 9954477 - Disclosure - STOCK-BASED AWARDS (Tables) link:presentationLink link:calculationLink link:definitionLink 9954478 - Disclosure - REVENUE AND CONTRACT LIABILITY (Tables) link:presentationLink link:calculationLink link:definitionLink 9954479 - Disclosure - NET LOSS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 9954480 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954481 - Disclosure - FAIR VALUE MEASUREMENT - Assets and Liabilities Measured At Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9954482 - Disclosure - FAIR VALUE MEASUREMENT - Level 3 Investment Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9954483 - Disclosure - PROPERTY AND EQUIPMENT, NET (Details) link:presentationLink link:calculationLink link:definitionLink 9954484 - Disclosure - PROPERTY AND EQUIPMENT, NET - Capitalized Software & Website Development (Details) link:presentationLink link:calculationLink link:definitionLink 9954485 - Disclosure - PROPERTY AND EQUIPMENT, NET - Depreciation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954486 - Disclosure - INTANGIBLE ASSETS, NET - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954487 - Disclosure - INTANGIBLE ASSETS, NET - Schedule of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954488 - Disclosure - EQUITY SECURITIES - Summary Of Equity Securities (Details) link:presentationLink link:calculationLink link:definitionLink 9954489 - Disclosure - EQUITY SECURITIES - Equity Securities Accounted Under ASC 323 And Ownership Interest (Details) link:presentationLink link:calculationLink link:definitionLink 9954490 - Disclosure - EQUITY SECURITIES (Details) - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954491 - Disclosure - EQUITY SECURITIES - Net Gain (Loss) Recognized On Equity Method Securities (Details) link:presentationLink link:calculationLink link:definitionLink 9954492 - Disclosure - EQUITY SECURITIES - Summarized Financial Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954493 - Disclosure - BORROWINGS (Details) link:presentationLink link:calculationLink link:definitionLink 9954494 - Disclosure - LEASES - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954495 - Disclosure - LEASES - Components of Lease Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954496 - Disclosure - LEASES - Other Information Related To Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9954497 - Disclosure - LEASES - Supplemental Balance Sheet Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954498 - Disclosure - LEASES - Operating Lease Maturities and Future Minimum Payments (Details) link:presentationLink link:calculationLink link:definitionLink 9954498 - Disclosure - LEASES - Operating Lease Maturities and Future Minimum Payments (Details) link:presentationLink link:calculationLink link:definitionLink 9954499 - Disclosure - STOCKHOLDERS' EQUITY - Common Stock (Details) link:presentationLink link:calculationLink link:definitionLink 9954500 - Disclosure - STOCKHOLDERS' EQUITY - JonesTrading Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 9954501 - Disclosure - STOCKHOLDERS' EQUITY - Stock Repurchase Program (Details) link:presentationLink link:calculationLink link:definitionLink 9954502 - Disclosure - STOCK-BASED AWARDS - Stock-based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954503 - Disclosure - STOCK-BASED AWARDS - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954504 - Disclosure - STOCK-BASED AWARDS - Restricted Stock Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9954505 - Disclosure - REVENUE AND CONTRACT LIABILITY - Deferred Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9954506 - Disclosure - REVENUE AND CONTRACT LIABILITY - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954507 - Disclosure - REVENUE AND CONTRACT LIABILITY - Sales Returns Allowance (Details) link:presentationLink link:calculationLink link:definitionLink 9954508 - Disclosure - NET LOSS PER SHARE - Income & Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9954509 - Disclosure - NET LOSS PER SHARE - Antidilutive Securities (Details) link:presentationLink link:calculationLink link:definitionLink