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Disclosure - STOCK-BASED COMPENSATION - Stock Incentive Plans (Details) link:presentationLink link:calculationLink link:definitionLink 99941103 - Disclosure - STOCK-BASED COMPENSATION - Stock Options (Details) link:presentationLink link:calculationLink link:definitionLink 99941104 - Disclosure - STOCK-BASED COMPENSATION - RSUs (Details) link:presentationLink link:calculationLink link:definitionLink 99941105 - Disclosure - STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 99941202 - Disclosure - LOSS PER SHARE - Antidilutive Securities (Details) link:presentationLink link:calculationLink link:definitionLink 99941301 - Disclosure - INCOME TAXES (Details) link:presentationLink link:calculationLink link:definitionLink 99941401 - Disclosure - COMMITMENTS AND CONTINGENCIES - Contingencies Related to Stanford and Merger Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 99941601 - 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Disclosure - ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES link:presentationLink link:calculationLink link:definitionLink 995210901 - Disclosure - PRIVATE PLACEMENTS link:presentationLink link:calculationLink link:definitionLink 995211001 - Disclosure - WARRANTS link:presentationLink link:calculationLink link:definitionLink 995211101 - Disclosure - STOCK-BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 995211201 - Disclosure - LOSS PER SHARE link:presentationLink link:calculationLink link:definitionLink 995211301 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 995211401 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 995211501 - Disclosure - SEGMENT link:presentationLink link:calculationLink link:definitionLink 995211601 - Disclosure - SUBSEQUENT EVENTS link:presentationLink link:calculationLink link:definitionLink 99920202 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 99930703 - Disclosure - PREPAID EXPENSES AND OTHER CURRENT ASSETS (Tables) link:presentationLink link:calculationLink link:definitionLink 99930803 - Disclosure - ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables) link:presentationLink link:calculationLink link:definitionLink 99931203 - Disclosure - LOSS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 99931503 - Disclosure - SEGMENT (Tables) link:presentationLink link:calculationLink link:definitionLink 99941201 - Disclosure - LOSS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink