100100 - Statement - CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 100200 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS link:presentationLink link:calculationLink link:definitionLink 100400 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 140902 - Disclosure - INCOME TAXES - SUMMARY OF COMPONENTS OF NET DEFERRED TAX ASSETS (Details) link:presentationLink link:calculationLink link:definitionLink 140903 - Disclosure - INCOME TAXES - SUMMARY OF RECONCILIATION OF FEDERAL INCOME TAX RATE (Details) link:presentationLink link:calculationLink link:definitionLink 200100 - Statement - Condensed Consolidated Balance Sheets (Unaudited) link:presentationLink link:calculationLink link:definitionLink 200200 - Statement - Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) link:presentationLink link:calculationLink link:definitionLink 200400 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) link:presentationLink link:calculationLink link:definitionLink 240301 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - SCHEDULE OF FAIR VALUE INSTRUMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 240303 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - SCHEDULE OF SHORT-TERM INVESTMENTS WITH UNREALIZED LOSSES (Details) link:presentationLink link:calculationLink link:definitionLink 240401 - Disclosure - BALANCE SHEET COMPONENTS - SCHEDULE OF PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) link:presentationLink link:calculationLink link:definitionLink 240402 - Disclosure - BALANCE SHEET COMPONENTS - SCHEDULE OF ACCRUED AND OTHER CURRENT LIABILITIES - (Details) link:presentationLink link:calculationLink link:definitionLink 240502 - Disclosure - COMMITMENTS AND CONTINGENCIES - SCHEDULE OF FUTURE MINIMUM ANNUAL LEASE PAYMENTS FOR OPERATING LEASES (Details) link:presentationLink link:calculationLink link:definitionLink 240502 - Disclosure - COMMITMENTS AND CONTINGENCIES - SCHEDULE OF FUTURE MINIMUM ANNUAL LEASE PAYMENTS FOR OPERATING LEASES (Details) (Calc 2) link:presentationLink link:calculationLink link:definitionLink 240504 - Disclosure - COMMITMENTS AND CONTINGENCIES - SCHEDULE OF RENT EXPENSES (Details) link:presentationLink link:calculationLink link:definitionLink 100300 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 140101 - Disclosure - ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) link:presentationLink link:calculationLink link:definitionLink 140201 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) link:presentationLink link:calculationLink link:definitionLink 140203 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - SCHEDULE OF POTENTIALLY DILUTIVE SECURITIES NOT INCLUDED IN THE CALCULATION OF DILUTED NET LOSS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 140301 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - SCHEDULE OF FAIR VALUE INSTRUMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 140302 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - SCHEDULE OF SHORT TERM INVESTMENT (Details) link:presentationLink link:calculationLink link:definitionLink 140303 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - SCHEDULE OF SHORT-TERM INVESTMENTS WITH UNREALIZED LOSSES (Details) link:presentationLink link:calculationLink link:definitionLink 140501 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) link:presentationLink link:calculationLink link:definitionLink 140601 - Disclosure - STOCKHOLDERS' EQUITY (Details) link:presentationLink link:calculationLink link:definitionLink 140602 - Disclosure - STOCKHOLDERS' EQUITY - SCHEDULE OF COMMON STOCK SHARES RESERVED FOR ON AND AS-CONVERTED BASIS, FOR FUTURE ISSUANCE (Details) link:presentationLink link:calculationLink link:definitionLink 140701 - Disclosure - SHARE-BASED COMPENSATION (Details) link:presentationLink link:calculationLink link:definitionLink 140703 - Disclosure - SHARE-BASED COMPENSATION - SCHEDULE OF UNVESTED RESTRICTED STOCK UNIT ACTIVITY (Details) link:presentationLink link:calculationLink link:definitionLink 140704 - Disclosure - SHARE-BASED COMPENSATION - SCHEDULE OF FAIR VALUE OF STOCK OPTIONS ASSUMPTIONS (Details) link:presentationLink link:calculationLink link:definitionLink 140705 - Disclosure - SHARE-BASED COMPENSATION - SCHEDULE OF STOCK-BASED COMPENSATION EXPENSE RECOGNIZED FOR STOCK OPTION GRANTS (Details) link:presentationLink link:calculationLink link:definitionLink 140706 - Disclosure - SHARE-BASED COMPENSATION - SCHEDULE OF STOCK-BASED COMPENSATION EXPENSE BY TYPE OF AWARDS (Details) link:presentationLink link:calculationLink link:definitionLink 140801 - Disclosure - RELATED PARTY TRANSACTIONS (Details) link:presentationLink link:calculationLink link:definitionLink 140901 - Disclosure - INCOME TAXES (Details) link:presentationLink link:calculationLink link:definitionLink 200300 - Statement - Condensed Consolidated Statements of Stockholders' Equity (Unaudited) link:presentationLink link:calculationLink link:definitionLink 240101 - Disclosure - ORGANIZATION AND NATURE OF OPERATIONS (Details) link:presentationLink link:calculationLink link:definitionLink 240201 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - SCHEDULE OF NET LOSS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 240202 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - SCHEDULE OF POTENTIALLY DILUTIVE SECURITIES NOT INCLUDED IN THE CALCULATION OF DILUTED NET LOSS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 240302 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - SCHEDULE OF SHORT TERM INVESTMENT (Details) link:presentationLink link:calculationLink link:definitionLink 240403 - Disclosure - BALANCE SHEET COMPONENTS - WORKFORCE REDUCTION PLAN (Details) link:presentationLink link:calculationLink link:definitionLink 240501 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) link:presentationLink link:calculationLink link:definitionLink 240601 - Disclosure - STOCKHOLDERS' EQUITY (Details) link:presentationLink link:calculationLink link:definitionLink 240602 - Disclosure - STOCKHOLDERS' EQUITY - SCHEDULE OF COMMON STOCK SHARES RESERVED FOR ON AND AS-CONVERTED BASIS, FOR FUTURE ISSUANCE (Details) link:presentationLink link:calculationLink link:definitionLink 240701 - Disclosure - STOCK-BASED COMPENSATION (Details) link:presentationLink link:calculationLink link:definitionLink 240703 - Disclosure - STOCK-BASED COMPENSATION - SCHEDULE OF UNVESTED RESTRICTED STOCK UNIT ACTIVITY (Details) link:presentationLink link:calculationLink link:definitionLink 240704 - Disclosure - STOCK-BASED COMPENSATION - SCHEDULE OF STOCK-BASED COMPENSATION EXPENSE (Details) link:presentationLink link:calculationLink link:definitionLink 240705 - Disclosure - STOCK-BASED COMPENSATION - SCHEDULE OF STOCK-BASED COMPENSATION EXPENSE BY TYPE OF AWARDS (Details) link:presentationLink link:calculationLink link:definitionLink 240801 - Disclosure - SUBSEQUENT EVENT (Details) link:presentationLink link:calculationLink link:definitionLink 100090 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 100105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 110101 - Disclosure - ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 110201 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 110301 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS link:presentationLink link:calculationLink link:definitionLink 110401 - Disclosure - BALANCE SHEET COMPONENTS link:presentationLink link:calculationLink link:definitionLink 110501 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 110601 - Disclosure - STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 110701 - Disclosure - SHARE-BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 110801 - Disclosure - RELATED PARTY TRANSACTIONS link:presentationLink link:calculationLink link:definitionLink 110901 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 120202 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 130203 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 130303 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 130403 - Disclosure - BALANCE SHEET COMPONENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 130503 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) link:presentationLink link:calculationLink link:definitionLink 130603 - Disclosure - STOCKHOLDERS' EQUITY (Tables) link:presentationLink link:calculationLink link:definitionLink 130703 - Disclosure - SHARE-BASED COMPENSATION (Tables) link:presentationLink link:calculationLink link:definitionLink 130903 - Disclosure - INCOME TAXES (Tables) link:presentationLink link:calculationLink link:definitionLink 140202 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - SCHEDULE OF NET LOSS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 140401 - Disclosure - BALANCE SHEET COMPONENTS - SCHEDULE OF PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) link:presentationLink link:calculationLink link:definitionLink 140402 - Disclosure - BALANCE SHEET COMPONENTS - SCHEDULE OF ACCRUED AND OTHER CURRENT LIABILITIES - (Details) link:presentationLink link:calculationLink link:definitionLink 140502 - Disclosure - COMMITMENTS AND CONTINGENCIES - SCHEDULE OF FUTURE MINIMUM ANNUAL LEASE PAYMENTS FOR OPERATING LEASES (Details) link:presentationLink link:calculationLink link:definitionLink 140702 - Disclosure - SHARE-BASED COMPENSATION - SCHEDULE OF OPTION ACTIVITY UNDER 2021 PLAN AND 2018 PLAN (Details) link:presentationLink link:calculationLink link:definitionLink 140904 - Disclosure - INCOME TAXES - SUMMARY OF GROSS UNRECOGNIZED TAX BENEFITS (Details) link:presentationLink link:calculationLink link:definitionLink 200105 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 210101 - Disclosure - ORGANIZATION AND NATURE OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 210201 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 210301 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS link:presentationLink link:calculationLink link:definitionLink 210401 - Disclosure - BALANCE SHEET COMPONENTS link:presentationLink link:calculationLink link:definitionLink 210501 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 210601 - Disclosure - STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 210701 - Disclosure - STOCK-BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 210801 - Disclosure - SUBSEQUENT EVENT link:presentationLink link:calculationLink link:definitionLink 220202 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 230203 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 230303 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 230403 - Disclosure - BALANCE SHEET COMPONENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 230503 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) link:presentationLink link:calculationLink link:definitionLink 230603 - Disclosure - STOCKHOLDERS' EQUITY (Tables) link:presentationLink link:calculationLink link:definitionLink 230703 - Disclosure - STOCK-BASED COMPENSATION (Tables) link:presentationLink link:calculationLink link:definitionLink 240503 - Disclosure - COMMITMENTS AND CONTINGENCIES - SCHEDULE OF SUPPLEMENTAL CASH FLOW (Details) link:presentationLink link:calculationLink link:definitionLink 240702 - Disclosure - STOCK-BASED COMPENSATION - SCHEDULE OF OPTION ACTIVITY UNDER 2021 PLAN AND 2018 PLAN (Details) link:presentationLink link:calculationLink link:definitionLink 99900 - Disclosure - Standard And Custom Axis Domain Defaults link:presentationLink link:calculationLink link:definitionLink