100000 - Document - DOCUMENT AND ENTITY INFORMATION link:presentationLink link:calculationLink link:definitionLink 100010 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 100020 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 100030 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS link:presentationLink link:calculationLink link:definitionLink 100040 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 100050 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 100060 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 100070 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 100080 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 100090 - Disclosure - ACCRUED LIABILITIES link:presentationLink link:calculationLink link:definitionLink 100100 - Disclosure - DEBT link:presentationLink link:calculationLink link:definitionLink 100110 - Disclosure - CONTINGENCIES AND UNCERTAINTIES link:presentationLink link:calculationLink link:definitionLink 100120 - Disclosure - STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 100130 - Disclosure - SUBSEQUENT EVENT link:presentationLink link:calculationLink link:definitionLink 100140 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 100150 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 100160 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 100170 - Disclosure - ACCRUED LIABILITIES (Tables) link:presentationLink link:calculationLink link:definitionLink 100180 - Disclosure - DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 100190 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NET LOSS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 100200 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ANTI-DILUTIVE SHARES (Details) link:presentationLink link:calculationLink link:definitionLink 100210 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - USEFUL LIVES OF ASSETS (Details) link:presentationLink link:calculationLink link:definitionLink 100220 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK BASED COMPENSATION (Details) link:presentationLink link:calculationLink link:definitionLink 100230 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK OPTIONS AND EMPLOYEE STOCK PURCHASE PLAN (Details) link:presentationLink link:calculationLink link:definitionLink 100240 - Disclosure - FAIR VALUE MEASUREMENTS - SECURITY TYPE (Details) link:presentationLink link:calculationLink link:definitionLink 100250 - Disclosure - FAIR VALUE MEASUREMENTS - SECURITIES WITH UNREALIZED LOSSES (Details) link:presentationLink link:calculationLink link:definitionLink 100260 - Disclosure - FAIR VALUE MEASUREMENTS - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100270 - Disclosure - FAIR VALUE MEASUREMENTS - RECURRING BASIS (Details) link:presentationLink link:calculationLink link:definitionLink 100280 - Disclosure - FAIR VALUE MEASUREMENTS - EQUITY INVESTMENT (Details) link:presentationLink link:calculationLink link:definitionLink 100290 - Disclosure - ACCRUED LIABILITIES (Details) link:presentationLink link:calculationLink link:definitionLink 100300 - Disclosure - DEBT - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 100310 - Disclosure - DEBT - Future Minimum Payments Under Loan Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 100320 - Disclosure - CONTINGENCIES AND UNCERTAINTIES - Litigation Settlement (Details) link:presentationLink link:calculationLink link:definitionLink 100330 - Disclosure - CONTINGENCIES AND UNCERTAINTIES - Severance Plan (Details) link:presentationLink link:calculationLink link:definitionLink 100340 - Disclosure - STOCKHOLDERS' EQUITY - PUBLIC OFFERING (Details) link:presentationLink link:calculationLink link:definitionLink 100350 - Disclosure - STOCKHOLDERS' EQUITY - WARRANT EXERCISES (Details) link:presentationLink link:calculationLink link:definitionLink 100360 - Disclosure - STOCKHOLDERS' EQUITY - EMPLOYEE STOCK PURCHASE PLAN (Details) link:presentationLink link:calculationLink link:definitionLink 100370 - Disclosure - STOCKHOLDERS' EQUITY - 2018 EQUITY INCENTIVE PLAN (Details) link:presentationLink link:calculationLink link:definitionLink 100380 - Disclosure - STOCKHOLDERS' EQUITY - 2018 INDUCEMENT AWARD PLAN (Details) link:presentationLink link:calculationLink link:definitionLink