00100 - Statement - Consolidated Balance Sheets
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00200 - Statement - Consolidated Statements of Net Loss and Comprehensive Loss
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00400 - Statement - Consolidated Statements of Cash Flows
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40501 - Disclosure - ACCRUED LIABILITIES (Details)
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40606 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS - Lease maturities (Details)
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40608 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS - Lease maturities (Details) (calc 2)
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40901 - Disclosure - RELATED PARTY TRANSACTIONS (Details)
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41001 - Disclosure - INCOME TAXES - Expense (Details)
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41002 - Disclosure - INCOME TAXES - Reconciliation of Income Taxes (Details)
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41003 - Disclosure - INCOME TAXES - Deferred tax assets/(liabilities) (Details)
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00300 - Statement - Consolidated Statements of Changes in Stockholders' Equity
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30603 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS (Tables)
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30803 - Disclosure - SHARE-BASED COMPENSATION (Tables)
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40202 - Disclosure - BASIS OF PRESENTATION - Secondary public offering (Details)
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40301 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value Measurement (Details)
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40303 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details)
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40304 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details)
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40305 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details)
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40306 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Research and development (Details)
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40308 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently issued accounting pronouncements (Details)
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40402 - Disclosure - NET LOSS PER SHARE - Anti-dilutive securities (Details)
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40601 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS - MSK, CD33 and MabVax License Agreement (Details)
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40602 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS - SADA License Agreement (Details)
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40603 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS - Other agreements (Details)
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40604 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS - Lease agreements (Details)
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40605 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS - Lease costs (Details)
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40608 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS - Lease term and discount rate (Details)
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40702 - Disclosure - STOCKHOLDERS' EQUITY - Stock grant agreements with non-employees, Stock (Details)
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40703 - Disclosure - STOCKHOLDERS' EQUITY - Issuance of common stock (Details)
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40801 - Disclosure - SHARE-BASED COMPENSATION - 2015 Plan (Details)
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40802 - Disclosure - SHARE-BASED COMPENSATION - 2018 Plan (Details)
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40803 - Disclosure - SHARE-BASED COMPENSATION - Stock option expense (Details)
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40804 - Disclosure - SHARE-BASED COMPENSATION - Stock Option Valuation (Details)
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40805 - Disclosure - SHARE-BASED COMPENSATION - Stock option activity (Details)
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40806 - Disclosure - SHARE-BASED COMPENSATION - Stock option unrecognized compensation (Details)
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40807 - Disclosure - SHARE-BASED COMPENSATION - Restricted Stock Unit Activity (Details)
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41005 - Disclosure - INCOME TAXES - Net Operating Loss Carryforwards (Details)
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41101 - Disclosure - OTHER BENEFITS (Details)
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41201 - Disclosure - SUBSEQUENT EVENTS (Details)
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00090 - Document - Document and Entity Information
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00105 - Statement - Consolidated Balance Sheets (Parenthetical)
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10101 - Disclosure - ORGANIZATION AND DESCRIPTION OF BUSINESS
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10201 - Disclosure - BASIS OF PRESENTATION
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10301 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
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10401 - Disclosure - NET LOSS PER SHARE
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10501 - Disclosure - ACCRUED LIABILITIES
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10601 - Disclosure - LICENSE AGREEMENTS AND COMMITMENTS
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10701 - Disclosure - STOCKHOLDERS' EQUITY
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10801 - Disclosure - SHARE-BASED COMPENSATION
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10901 - Disclosure - RELATED PARTY TRANSACTIONS
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11001 - Disclosure - INCOME TAXES
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11101 - Disclosure - OTHER BENEFITS
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11201 - Disclosure - SUBSEQUENT EVENTS
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11301 - Disclosure - QUARTERLY CONSOLIDATED FINANCIAL DATA (unaudited)
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20302 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)
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30303 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
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30403 - Disclosure - NET LOSS PER SHARE (Tables)
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30503 - Disclosure - ACCRUED LIABILITIES (Tables)
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31003 - Disclosure - INCOME TAXES (Tables)
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31303 - Disclosure - QUARTERLY CONSOLIDATED FINANCIAL DATA (unaudited) (Tables)
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40201 - Disclosure - BASIS OF PRESENTATION - Accumulated deficit and cash (Details)
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40302 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Operating Leases (Details)
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40307 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other policies (Details)
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40401 - Disclosure - NET LOSS PER SHARE - Basic and diluted (Details)
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40701 - Disclosure - STOCKHOLDERS' EQUITY - Authorized, Common and Preferred Stock (Details)
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41004 - Disclosure - INCOME TAXES - Uncertain tax positions (Details)
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41301 - Disclosure - QUARTERLY CONSOLIDATED FINANCIAL DATA (unaudited) (Details)
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