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FAIR VALUE MEASUREMENTS - Schedule of Preferred Stock Derivative Liability (Details) link:presentationLink link:calculationLink link:definitionLink 141204 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Changes in Assumption at Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 141205 - Disclosure - FAIR VALUE MEASUREMENTS - Summary of Changes in Assumption at Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 141206 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Warrant Liability Activity (Details) link:presentationLink link:calculationLink link:definitionLink 141401 - Disclosure - SUBSEQUENT EVENTS (Details) link:presentationLink link:calculationLink link:definitionLink 200105 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 200300 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF MEZZANINE EQUITY AND STOCKHOLDERS' DEFICIT link:presentationLink link:calculationLink link:definitionLink 240101 - Disclosure - DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Details) link:presentationLink link:calculationLink link:definitionLink 240201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 240501 - Disclosure - DEBT & LIQUIDITY (Details) link:presentationLink link:calculationLink link:definitionLink 240601 - Disclosure - MEZZANINE EQUITY (Details) link:presentationLink link:calculationLink link:definitionLink 240701 - Disclosure - STOCK-BASED COMPENSATION - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 240702 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Stock Options Under the 2014 Plan (Details) link:presentationLink link:calculationLink link:definitionLink 240703 - Disclosure - STOCK-BASED COMPENSATION - Schedule of RSA Activity Under the 2021 Plan (Details) link:presentationLink link:calculationLink link:definitionLink 240801 - Disclosure - INCOME TAXES (Details) link:presentationLink link:calculationLink link:definitionLink 240901 - 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