0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 0000002 - Document - Audit Information link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - Consolidated Balance Sheets (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - Consolidated Statements of Operations link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - Consolidated Statements of Changes in Stockholders’ Equity link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 9952156 - Disclosure - DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - CAPITALIZED SOFTWARE, NET link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - PROPERTY AND EQUIPMENT, NET link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - LEASES link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - SIGNIFICANT BALANCE SHEET COMPONENTS link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - FINANCING ARRANGEMENTS link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - PREFERRED STOCK AND STOCKHOLDERS’ EQUITY link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - STOCK INCENTIVE PLANS link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - NET LOSS PER SHARE link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - EMPLOYEE BENEFIT PLANS link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - RELATED PARTY TRANSACTIONS link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - CAPITALIZED SOFTWARE, NET (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - PROPERTY AND EQUIPMENT, NET (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - LEASES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - SIGNIFICANT BALANCE SHEET COMPONENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - 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Disclosure - LEASES - Lease Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - LEASES - Lease Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - SIGNIFICANT BALANCE SHEET COMPONENTS - Other Current Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - SIGNIFICANT BALANCE SHEET COMPONENTS - Accrued Expenses and Other Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - FINANCING ARRANGEMENTS - Amortizing Term Mortgage (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - FINANCING ARRANGEMENTS - Loan and Security Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - FINANCING ARRANGEMENTS - Monthly Revolving Line of Credit (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - PREFERRED STOCK AND STOCKHOLDERS’ EQUITY - Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - STOCK INCENTIVE PLANS - 2009 and 2019 Stock Plans (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - STOCK INCENTIVE PLANS - 2021 Incentive Plan and Stock Purchase and Matching Plan (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - STOCK INCENTIVE PLANS - RSU Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - STOCK INCENTIVE PLANS - RSU Rollforward (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - STOCK INCENTIVE PLANS - Stock Option Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - STOCK INCENTIVE PLANS - Stock Option Roll-forward (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - STOCK INCENTIVE PLANS - Stock-based Compensation (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - STOCK INCENTIVE PLANS - Stock-Based Compensation Income Statement Location (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - STOCK INCENTIVE PLANS - Stock-based Compensation Narratives (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - INCOME TAXES - Loss Before Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - INCOME TAXES - Components of Provision for Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - INCOME TAXES - Reconciliation of Effective Tax Rate (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - INCOME TAXES - Deferred Tax Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - 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