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           NATURE OF BUSINESS, ORGANIZATION AND GOING CONCERN 
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        6 Months Ended | 
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           Jun. 30, 2013 
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| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
| Nature Of Business Organization and Going Concern Disclosure [Text Block] |                  1. NATURE OF BUSINESS, ORGANIZATION AND GOING  CONCERN
       Novelos Therapeutics, Inc. (“Novelos” or the  “Company”) is a pharmaceutical company developing novel  drugs for the treatment and diagnosis of cancer.       The Company is subject to a number of risks similar to those of  other small pharmaceutical companies. Principal among these risks  are dependence on key individuals, competition from substitute  products and larger companies, the successful development and  marketing of its products in a highly regulated environment and the  need to obtain additional financing necessary to fund future  operations.       The accompanying financial statements have been prepared on a basis  that assumes that the Company will continue as a going concern and  that contemplates the continuity of operations, realization of  assets and the satisfaction of liabilities and commitments in the  normal course of business. The Company has incurred losses since  inception in devoting substantially all of its efforts toward  research and development and has an accumulated deficit of $45,795,741 at June 30, 2013. During  the six months ended June 30, 2013, the Company generated a net  loss of $5,518,341 and the  Company expects that it will continue to generate operating losses  for the foreseeable future. The Company believes that its cash  balance at June 30, 2013 is adequate to fund operations at budgeted  levels through the end of 2013. The cash balance at June 30, 2013  excludes approximately $1,878,000 contractually designated for  use towards the $3,000,000  estimated cost of construction of an in-house manufacturing  facility for the Company’s LIGHT compound. As an alternative  to this project, the Company is undertaking a transfer of the LIGHT  manufacturing process to a contract manufacturer in order to  accommodate larger scale production of LIGHT. The Company’s  ability to execute its operating plan beyond the end of 2013  depends on its ability to obtain additional funding via the sale of  equity and/or debt securities, a strategic transaction or  otherwise.  The Company plans to continue to actively pursue  financing alternatives, but there can be no assurance that it will  obtain the necessary funding.  The accompanying financial  statements do not include any adjustments that might result from  the outcome of this uncertainty.       The accompanying balance sheet as of December 31, 2012 has been  derived from audited financial statements. The accompanying  unaudited consolidated balance sheet as of June 30, 2013, the  consolidated statements of operations for the three and six months  ended June 30, 2013 and 2012 and the cumulative period November 7,  2002 (date of inception) through June 30, 2013, and the  consolidated statements of cash flows for the three and six months  ended June 30, 2013 and 2012 and the cumulative period November 7,  2002 (date of inception) through June 30, 2013 and the related  interim information contained within the notes to the consolidated  financial statements have been prepared in accordance with the  rules and regulations of the Securities and Exchange Commission  (“SEC”) for interim financial information. Accordingly,  they do not include all of the information and the notes required  by U.S. generally accepted accounting principles for complete  financial statements. In the opinion of management, the unaudited  interim consolidated financial statements reflect all adjustments,  consisting of normal and recurring adjustments, necessary for the  fair presentation of the Company’s consolidated financial  position at June 30, 2013 and consolidated results of its  operations and its cash flows for the three and six months ended  June 30, 2013 and 2012 and the period from November 7, 2002  (inception) to June 30, 2013. The results for the six months  ended June 30, 2013 are not necessarily indicative of future  results.       These unaudited consolidated financial statements should be read in  conjunction with the audited financial statements and related notes  thereto included in the Company’s Form 10-K, which was filed  with the SEC on March 28, 2013.       Principles of Consolidation   The consolidated  financial statements include the accounts of the Company and the  accounts of its wholly-owned subsidiary. All intercompany accounts  and transactions have been eliminated in consolidation.       Restricted Cash   The Company accounts  for cash that is restricted for other than current operations as  restricted cash. Restricted cash (current) at June 30, 2013  consists of a certificate of deposit of $55,000 required under the Company’s  lease agreement for its Madison, Wisconsin facility. Restricted  cash (non-current) includes $1,878,232 of cash that has been  contractually designated for use towards the construction of a  clinical-stage manufacturing  facility for LIGHT at the Company’s Madison, WI  location.        Deferred Financing Costs    Incremental direct costs associated with the issuance of the  Company’s common stock are deferred and are recognized as a  reduction of the gross proceeds upon completion of the related  equity transaction. In the event that the equity transaction is not  probable or is aborted, the Company expenses such costs. There were  no deferred financing costs as of June 30, 2013. At December 31,  2012, the Company had recorded $70,539 of costs in connection with a  public offering of stock. During the six months ended June 30,  2013, upon the completion of the associated equity transaction, the  deferred costs were offset against the gross proceeds received (see  Note 3).       Goodwill   Intangible assets at  June 30, 2013 consist of goodwill recorded in connection with a  business combination with Cellectar, Inc. (Cellectar), a privately  held Wisconsin corporation that designed and developed products to  detect, treat and monitor a wide variety of human cancers (the  Acquisition). Goodwill is not amortized, but is required to be  evaluated for impairment annually or    whenever events or changes in circumstances suggest that the  carrying value of an asset may not be recoverable.  The Company evaluates  goodwill for impairment annually in the fourth fiscal quarter and  additionally on an interim basis if an event occurs or there is a  change in circumstances, such as a decline in the Company’s  stock price or a material adverse change in the business climate,  which would more likely than not reduce the fair value of the  reporting unit below its carrying amount. There were no changes in  goodwill during the six months ended June 30, 2013.       Stock-Based Compensation   The Company uses the  Black-Scholes option-pricing model to calculate the grant-date fair  value of stock option awards. The resulting compensation expense,  net of expected forfeitures, for awards that are not  performance-based is recognized on a straight-line basis over the  service period of the award, which is generally three years for  stock options. For stock options with performance-based vesting  provisions, recognition of compensation expense, net of expected  forfeitures, commences if and when the achievement of the  performance criteria is deemed probable. The compensation expense,  net of expected forfeitures, for performance-based stock options is  recognized over the relevant performance period. Non-employee  stock-based compensation is accounted for in accordance with the  guidance of Topic 505,  Equity  of the Financial Accounting  Standards Board Accounting Standards Codification (“FASB  ASC”).      As such, the Company recognizes expense based on the  estimated fair value of options granted to non-employees over their  vesting period, which is generally the period during which services  are rendered and deemed completed by such non-employees.       Fair Value of Financial Instruments   The guidance  under FASB ASC Topic 825,  Financial  Instruments, requires disclosure of the fair value of certain  financial instruments. Financial instruments in the accompanying  financial statements consist of cash equivalents, accounts payable  and long-term obligations.  The carrying amount of cash  equivalents and accounts  payable approximate their fair value due to their  short-term nature.  The carrying value of long-term  obligations, including the current portion, approximates fair value  because the fixed interest rate approximates current market  interest rates available on similar instruments.       Derivative Instruments   The Company generally  does not use derivative instruments to hedge exposures to cash flow  or market risks.  However, certain warrants to purchase common  stock that do not meet the requirements for classification as  equity, in accordance with the Derivatives and Hedging Topic of the  FASB ASC, are classified as liabilities.  In such instances,  net-cash settlement is assumed for financial reporting purposes,  even when the terms of the underlying contracts do not provide for  a net-cash settlement. These warrants are considered derivative  instruments because the agreements contain “down-round”  provisions whereby the number of shares for which the warrants are  exercisable and/or the exercise price of the warrants are subject  to change in the event of certain issuances of stock at prices  below the then-effective exercise price of the warrants. The number  of shares issuable under such warrants was 16,527,310 and 27,310 at June 30, 2013 and December 31,  2012, respectively. The primary underlying risk exposure pertaining  to the warrants is the change in fair value of the underlying  common stock.  Such financial instruments are initially  recorded at fair value with subsequent changes in fair value  recorded as a component of gain or loss on derivatives on the  consolidated statements of operations in each reporting period. If  these instruments subsequently meet the requirements for equity  classification, the Company reclassifies the fair value to equity.  At June 30, 2013 and December 31, 2012, these warrants represented  the only outstanding derivative instruments issued or held by the  Company.    |