0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 0000002 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 0000003 - Statement - Condensed Consolidated Balance Sheets (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 0000004 - Statement - Condensed Consolidated Statements of Operations link:presentationLink link:calculationLink link:definitionLink 0000005 - Statement - Condensed Consolidated Statements of Changes in Stockholders’ Equity link:presentationLink link:calculationLink link:definitionLink 0000006 - Statement - Condensed Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 0000007 - Disclosure - GENERAL INFORMATION link:presentationLink link:calculationLink link:definitionLink 0000008 - Disclosure - REVENUE AND CERTAIN STATEMENTS OF OPERATIONS COMPONENTS link:presentationLink link:calculationLink link:definitionLink 0000009 - Disclosure - CERTAIN BALANCE SHEET COMPONENTS link:presentationLink link:calculationLink link:definitionLink 0000010 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - STOCK INCENTIVE PLANS link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - NET LOSS PER SHARE link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - EQUITY link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - RELATED PARTY TRANSACTIONS link:presentationLink link:calculationLink link:definitionLink 9954471 - Disclosure - GENERAL INFORMATION (Policies) link:presentationLink link:calculationLink link:definitionLink 9954472 - Disclosure - REVENUE AND CERTAIN STATEMENTS OF OPERATIONS COMPONENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9954473 - Disclosure - CERTAIN BALANCE SHEET COMPONENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9954474 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9954475 - Disclosure - STOCK INCENTIVE PLANS (Tables) link:presentationLink link:calculationLink link:definitionLink 9954476 - Disclosure - NET LOSS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 9954477 - Disclosure - REVENUE AND CERTAIN STATEMENTS OF OPERATIONS COMPONENTS - Total Revenue by Geographic Area (Details) link:presentationLink link:calculationLink link:definitionLink 9954478 - Disclosure - REVENUE AND CERTAIN STATEMENTS OF OPERATIONS COMPONENTS - Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9954479 - Disclosure - CERTAIN BALANCE SHEET COMPONENTS - Other current assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954480 - Disclosure - CERTAIN BALANCE SHEET COMPONENTS - Capitalized software, net (Details) link:presentationLink link:calculationLink link:definitionLink 9954481 - Disclosure - CERTAIN BALANCE SHEET COMPONENTS - Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9954482 - Disclosure - CERTAIN BALANCE SHEET COMPONENTS - Property and equipment, net (Details) link:presentationLink link:calculationLink link:definitionLink 9954483 - Disclosure - CERTAIN BALANCE SHEET COMPONENTS - Accrued expenses and other liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954484 - Disclosure - COMMITMENTS AND CONTINGENCIES - Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9954485 - Disclosure - COMMITMENTS AND CONTINGENCIES - Summary of Lease Cost (Details) link:presentationLink link:calculationLink link:definitionLink 9954486 - Disclosure - COMMITMENTS AND CONTINGENCIES - Summary of Related to Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9954487 - Disclosure - COMMITMENTS AND CONTINGENCIES - Cashflow Disclosures (Details) link:presentationLink link:calculationLink link:definitionLink 9954488 - Disclosure - COMMITMENTS AND CONTINGENCIES - Lease Maturity Schedule (Details) link:presentationLink link:calculationLink link:definitionLink 9954488 - Disclosure - COMMITMENTS AND CONTINGENCIES - Lease Maturity Schedule (Details) link:presentationLink link:calculationLink link:definitionLink 9954489 - Disclosure - COMMITMENTS AND CONTINGENCIES - Amortizing Term Mortgage Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9954490 - Disclosure - COMMITMENTS AND CONTINGENCIES - 2021 Amended Term Loan Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9954491 - Disclosure - COMMITMENTS AND CONTINGENCIES - Monthly revolving line of credit Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9954492 - Disclosure - COMMITMENTS AND CONTINGENCIES - Future aggregate annual principal payments on all long-term debt (Details) link:presentationLink link:calculationLink link:definitionLink 9954493 - Disclosure - COMMITMENTS AND CONTINGENCIES - Defined Contribution Plans Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9954494 - Disclosure - STOCK INCENTIVE PLANS - 2009 and 2019 Stock Option Plan Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9954495 - Disclosure - STOCK INCENTIVE PLANS - 2021 Incentive Plan and Matching Plan Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9954496 - Disclosure - STOCK INCENTIVE PLANS - RSU Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9954497 - Disclosure - STOCK INCENTIVE PLANS - RSU Rollforward (Details) link:presentationLink link:calculationLink link:definitionLink 9954498 - Disclosure - STOCK INCENTIVE PLANS - Stock Option Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9954499 - Disclosure - STOCK INCENTIVE PLANS - Stock Option Roll-forward (Details) link:presentationLink link:calculationLink link:definitionLink 9954500 - Disclosure - STOCK INCENTIVE PLANS - Stock-Based Compensation by Award Type (Details) link:presentationLink link:calculationLink link:definitionLink 9954501 - Disclosure - STOCK INCENTIVE PLANS - Stock-Based Compensation Income Statement Location (Details) link:presentationLink link:calculationLink link:definitionLink 9954502 - Disclosure - STOCK INCENTIVE PLANS - Stock-based Compensation Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9954503 - Disclosure - INCOME TAXES - (Details) link:presentationLink link:calculationLink link:definitionLink 9954504 - Disclosure - NET LOSS PER SHARE - Schedule of Earnings Per Share, Basic and Diluted (Details) link:presentationLink link:calculationLink link:definitionLink 9954505 - Disclosure - NET LOSS PER SHARE - Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9954506 - Disclosure - NET LOSS PER SHARE - Anti-dilutive Securities (Details) link:presentationLink link:calculationLink link:definitionLink 9954507 - Disclosure - EQUITY (Details) link:presentationLink link:calculationLink link:definitionLink 9954508 - Disclosure - RELATED PARTY TRANSACTIONS (Details) link:presentationLink link:calculationLink link:definitionLink