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 STATEMENT 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 0000016 - Disclosure - GENERAL INFORMATION (Policies) link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - REVENUE AND CERTAIN STATEMENT OF OPERATIONS COMPONENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 0000018 - Disclosure - CERTAIN BALANCE SHEET COMPONENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 0000019 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) link:presentationLink link:calculationLink link:definitionLink 0000020 - Disclosure - STOCK INCENTIVE PLANS (Tables) link:presentationLink link:calculationLink link:definitionLink 0000021 - Disclosure - NET LOSS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 0000022 - Disclosure - REVENUE AND CERTAIN STATEMENT OF OPERATIONS COMPONENTS - Total Revenue by Geographic Area (Details) link:presentationLink link:calculationLink link:definitionLink 0000023 - Disclosure - REVENUE AND CERTAIN STATEMENT OF OPERATIONS COMPONENTS - Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 0000024 - Disclosure - CERTAIN BALANCE SHEET COMPONENTS - Other current assets (Details) link:presentationLink link:calculationLink link:definitionLink 0000025 - Disclosure - CERTAIN BALANCE SHEET COMPONENTS - Capitalized software, net (Details) link:presentationLink link:calculationLink link:definitionLink 0000026 - Disclosure - CERTAIN BALANCE SHEET COMPONENTS - Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 0000027 - Disclosure - CERTAIN BALANCE SHEET COMPONENTS - Property and equipment, net (Details) link:presentationLink link:calculationLink link:definitionLink 0000028 - Disclosure - CERTAIN BALANCE SHEET COMPONENTS - Accrued expenses and other liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000029 - Disclosure - COMMITMENTS AND CONTINGENCIES - Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 0000030 - Disclosure - COMMITMENTS AND CONTINGENCIES - Summary of Lease Cost (Details) link:presentationLink link:calculationLink link:definitionLink 0000031 - Disclosure - COMMITMENTS AND CONTINGENCIES - Summary of Related to Leases (Details)(Details) link:presentationLink link:calculationLink link:definitionLink 0000032 - Disclosure - COMMITMENTS AND CONTINGENCIES - Cashflow Disclosures (Details) link:presentationLink link:calculationLink link:definitionLink 0000033 - Disclosure - COMMITMENTS AND CONTINGENCIES - Lease Maturity Schedule (Details) link:presentationLink link:calculationLink link:definitionLink 0000033 - Disclosure - COMMITMENTS AND CONTINGENCIES - Lease Maturity Schedule (Details) link:presentationLink link:calculationLink link:definitionLink 0000034 - Disclosure - COMMITMENTS AND CONTINGENCIES - Lease Maturity Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 0000035 - Disclosure - COMMITMENTS AND CONTINGENCIES - Amortizing Term Mortgage (Details) link:presentationLink link:calculationLink link:definitionLink 0000036 - Disclosure - COMMITMENTS AND CONTINGENCIES - 2021 Amended Term Loan (Details) link:presentationLink link:calculationLink link:definitionLink 0000037 - Disclosure - COMMITMENTS AND CONTINGENCIES - Monthly revolving line of credit (Details) link:presentationLink link:calculationLink link:definitionLink 0000038 - Disclosure - COMMITMENTS AND CONTINGENCIES - Future aggregate annual principal payments on all long-term debt (Details) link:presentationLink link:calculationLink link:definitionLink 0000039 - Disclosure - COMMITMENTS AND CONTINGENCIES - Defined Contribution Plans (Details) link:presentationLink link:calculationLink link:definitionLink 0000040 - Disclosure - STOCK INCENTIVE PLANS - 2009 and 2019 Stock Option Plan (Details) link:presentationLink link:calculationLink link:definitionLink 0000041 - Disclosure - STOCK INCENTIVE PLANS - 2021 Incentive Plan and Matching Plan (Details) link:presentationLink link:calculationLink link:definitionLink 0000042 - Disclosure - STOCK INCENTIVE PLANS - RSU Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 0000043 - Disclosure - STOCK INCENTIVE PLANS - RSU Rollforward (Details) link:presentationLink link:calculationLink link:definitionLink 0000044 - Disclosure - STOCK INCENTIVE PLANS - Stock Option Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 0000045 - Disclosure - STOCK INCENTIVE PLANS - Stock Option Roll-forward (Details) link:presentationLink link:calculationLink link:definitionLink 0000046 - Disclosure - STOCK INCENTIVE PLANS - Stock-Based Compensation by Award Type (Details) link:presentationLink link:calculationLink link:definitionLink 0000047 - Disclosure - STOCK INCENTIVE PLANS - Stock-Based Compensation Income Statement Location (Details) link:presentationLink link:calculationLink link:definitionLink 0000048 - Disclosure - STOCK INCENTIVE PLANS - Stock-Based Compensation Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 0000049 - Disclosure - INCOME TAXES - (Details) link:presentationLink link:calculationLink link:definitionLink 0000050 - Disclosure - NET LOSS PER SHARE - Schedule of Earnings Per Share, Basic and Diluted (Details) link:presentationLink link:calculationLink link:definitionLink 0000051 - Disclosure - NET LOSS PER SHARE - Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 0000052 - Disclosure - NET LOSS PER SHARE - Anti-dilutive Securities (Details) link:presentationLink link:calculationLink link:definitionLink 0000053 - Disclosure - EQUITY (Details) link:presentationLink link:calculationLink link:definitionLink 0000054 - Disclosure - RELATED PARTY TRANSACTIONS (Details) link:presentationLink link:calculationLink link:definitionLink