00100 - Statement - Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 00200 - Statement - Consolidated Statements of Net Loss and Comprehensive Loss link:presentationLink link:calculationLink link:definitionLink 00400 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 40501 - Disclosure - ACCRUED LIABILITIES (Details) link:presentationLink link:calculationLink link:definitionLink 00300 - Statement - Consolidated Statements of Changes in Stockholders’ Equity link:presentationLink link:calculationLink link:definitionLink 30803 - Disclosure - SHARE-BASED COMPENSATION (Tables) link:presentationLink link:calculationLink link:definitionLink 40301 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 40402 - Disclosure - EARNINGS (LOSS) PER SHARE - (Anti-dilutive securities) (Details) link:presentationLink link:calculationLink link:definitionLink 40602 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS - MSK License Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 40603 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS - CD33 License Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 40604 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS - MabVax sublicense agreement (Details) link:presentationLink link:calculationLink link:definitionLink 40605 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS - Other agreements (Details) link:presentationLink link:calculationLink link:definitionLink 40606 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS - Lease agreements (Details) link:presentationLink link:calculationLink link:definitionLink 40702 - Disclosure - STOCKHOLDERS’ EQUITY - MSK License Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 40703 - Disclosure - STOCKHOLDERS’ EQUITY - Stock grant agreements with non-employees (Details) link:presentationLink link:calculationLink link:definitionLink 40704 - Disclosure - STOCKHOLDERS’ EQUITY - Stock options (Details) link:presentationLink link:calculationLink link:definitionLink 40705 - Disclosure - STOCKHOLDERS’ EQUITY - Issuance of common stock (Details) link:presentationLink link:calculationLink link:definitionLink 40801 - Disclosure - SHARE-BASED COMPENSATION - 2015 Equity Incentive Plan (Details) link:presentationLink link:calculationLink link:definitionLink 40802 - Disclosure - SHARE-BASED COMPENSATION - Expense (Details) link:presentationLink link:calculationLink link:definitionLink 40803 - Disclosure - SHARE-BASED COMPENSATION - Common stock options issued and outstanding (Details) link:presentationLink link:calculationLink link:definitionLink 40804 - Disclosure - SHARE-BASED COMPENSATION - Unrecognized compensation (Details) link:presentationLink link:calculationLink link:definitionLink 40805 - Disclosure - SHARE-BASED COMPENSATION - 2018 Equity Incentive Plan (Details) link:presentationLink link:calculationLink link:definitionLink 40901 - Disclosure - RELATED PARTY TRANSACTIONS (Details) link:presentationLink link:calculationLink link:definitionLink 41002 - Disclosure - INCOME TAXES - Tax Cuts and Jobs Act (TCJA) (Details) link:presentationLink link:calculationLink link:definitionLink 00090 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 00105 - Statement - Consolidated Balance Sheets (parenthetical) link:presentationLink link:calculationLink link:definitionLink 10101 - Disclosure - ORGANIZATION AND DESCRIPTION OF BUSINESS link:presentationLink link:calculationLink link:definitionLink 10201 - Disclosure - BASIS OF PRESENTATION link:presentationLink link:calculationLink link:definitionLink 10301 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 10401 - Disclosure - EARNINGS (LOSS) PER SHARE link:presentationLink link:calculationLink link:definitionLink 10501 - Disclosure - ACCRUED LIABILITIES link:presentationLink link:calculationLink link:definitionLink 10601 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS link:presentationLink link:calculationLink link:definitionLink 10701 - Disclosure - STOCKHOLDERS’ EQUITY link:presentationLink link:calculationLink link:definitionLink 10801 - Disclosure - SHARE-BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 10901 - Disclosure - RELATED PARTY TRANSACTIONS link:presentationLink link:calculationLink link:definitionLink 11001 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 11101 - Disclosure - OTHER BENEFITS link:presentationLink link:calculationLink link:definitionLink 20302 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 30303 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 30403 - Disclosure - EARNINGS (LOSS) PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 30503 - Disclosure - ACCRUED LIABILITIES (Tables) link:presentationLink link:calculationLink link:definitionLink 40101 - Disclosure - ORGANIZATION AND DESCRIPTION OF BUSINESS (Details) link:presentationLink link:calculationLink link:definitionLink 40201 - Disclosure - BASIS OF PRESENTATION (Details) link:presentationLink link:calculationLink link:definitionLink 40302 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other (Details) link:presentationLink link:calculationLink link:definitionLink 40401 - Disclosure - EARNINGS (LOSS) PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 40601 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 40701 - Disclosure - STOCKHOLDERS’ EQUITY - Authorized, Common and Preferred Stock (Details) link:presentationLink link:calculationLink link:definitionLink 41001 - Disclosure - INCOME TAXES - Expense (Details) link:presentationLink link:calculationLink link:definitionLink 41003 - Disclosure - INCOME TAXES - Uncertain tax positions (Details) link:presentationLink link:calculationLink link:definitionLink