Document and Entity Information	3 Months Ended
Document and Entity Information	Sep. 30, 2012	Oct. 24, 2012
Document and Entity Information
Entity Registrant Name	IMMUNOGEN INC
Entity Central Index Key	0000855654
Document Type	10-Q
Document Period End Date	Sep. 30, 2012
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		84,120,529
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1

CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012
ASSETS
Cash and cash equivalents	$ 233,614	$ 160,938
Accounts receivable	853	129
Unbilled revenue	1,446	1,196
Inventory	170	1,288
Restricted cash	319	319
Prepaid and other current assets	2,419	2,400
Total current assets	238,821	166,270
Property and equipment, net of accumulated depreciation	11,442	11,633
Long-term restricted cash	2,231	2,231
Other assets	174	174
Total assets	252,668	180,308
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	3,216	3,395
Accrued compensation	2,436	4,942
Other accrued liabilities	7,421	4,589
Current portion of deferred lease incentive	979	979
Current portion of deferred revenue	1,376	2,349
Total current liabilities	15,428	16,254
Deferred lease incentive, net of current portion	6,360	6,605
Deferred revenue, net of current portion	69,769	69,761
Other long-term liabilities	3,799	3,798
Total liabilities	95,356	96,418
Commitments and contingencies (Note E)
Shareholders' equity:
Preferred stock, $.01 par value; authorized 5,000 shares; no shares issued and outstanding
Common stock, $.01 par value; authorized 100,000 shares; issued and outstanding 84,117 and 77,759 shares as of September 30, 2012 and June 30, 2012, respectively	841	778
Additional paid-in capital	685,619	587,068
Accumulated deficit	(529,148)	(503,956)
Total shareholders' equity	157,312	83,890
Total liabilities and shareholders' equity	$ 252,668	$ 180,308

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012
CONSOLIDATED BALANCE SHEETS
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized shares	5,000	5,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	100,000	100,000
Common stock, issued shares	84,117	77,759
Common stock, outstanding shares	84,117	77,759

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References+ Details

- Definition

Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share.

+ References+ Details

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Research and development support	$ 1,377	$ 1,068
License and milestone fees	933	1,187
Clinical materials revenue	1,781	281
Total revenues	4,091	2,536
Operating Expenses:
Research and development	23,700	17,161
General and administrative	5,639	4,841
Total operating expenses	29,339	22,002
Loss from operations	(25,248)	(19,466)
Other income (expense), net	56	(17)
Net loss	(25,192)	(19,483)
Basic and diluted net loss per common share (in dollars per share)	$ (0.30)	$ (0.26)
Basic and diluted weighted average common shares outstanding (in shares)	83,350	76,364
Comprehensive Loss	$ (25,192)	$ (19,483)

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net loss	$ (25,192)	$ (19,483)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	1,174	1,163
Gain on sale/disposal of fixed assets	(17)	(5)
Amortization of deferred lease incentive obligation	(245)	(244)
Loss on forward contracts	2	44
Stock and deferred share unit compensation	3,920	2,568
Deferred rent	(27)	(27)
Changes in operating assets and liabilities:
Accounts receivable	(724)	4,667
Unbilled revenue	(250)	390
Inventory	1,118	(667)
Prepaid and other current assets	(11)	1,374
Restricted cash		700
Other assets		17
Accounts payable	(179)	(363)
Accrued compensation	(2,506)	(2,417)
Other accrued liabilities	2,896	(95)
Deferred revenue	(965)	813
Net cash used for operating activities	(21,006)	(11,565)
Cash flows from investing activities:
Purchases of property and equipment, net	(966)	(554)
Payments from settlement of forward contracts	(46)	(38)
Net cash used for investing activities	(1,012)	(592)
Cash flows from financing activities:
Proceeds from common stock issuance, net	94,006
Proceeds from stock options exercised	688	716
Net cash provided by financing activities	94,694	716
Net change in cash and cash equivalents	72,676	(11,441)
Cash and cash equivalents, beginning balance	160,938	191,206
Cash and cash equivalents, ending balance	$ 233,614	$ 179,765

Summary of Significant Accounting Policies

3 Months Ended

Sep. 30, 2012

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

A. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited consolidated financial statements at September 30, 2012 and June 30, 2012 and for the three months ended September 30, 2012 and 2011 include the accounts of ImmunoGen, Inc., or the Company, and its wholly owned subsidiaries, ImmunoGen Securities Corp. and ImmunoGen Europe Limited. The consolidated financial statements include all of the adjustments, consisting only of normal recurring adjustments, which management considers necessary for a fair presentation of the Company’s financial position in accordance with accounting principles generally accepted in the U.S. for interim financial information. Certain information and footnote disclosures normally included in the Company’s annual financial statements have been condensed or omitted. The preparation of interim financial statements requires the use of management’s estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the interim financial statements and the reported amounts of revenues and expenditures during the reported periods. The results of the interim periods are not necessarily indicative of the results for the entire year. Accordingly, the interim financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended June 30, 2012.

Subsequent Events

The Company has evaluated all events or transactions that occurred after September 30, 2012 up through the date the Company issued these financial statements. During this period, the Company did not have any material recognizable or unrecognizable subsequent events.

Revenue Recognition

The Company enters into licensing and development agreements with collaborative partners for the development of monoclonal antibody-based anticancer therapeutics. The terms of these agreements contain multiple deliverables which may include (i) licenses, or options to obtain licenses, to the Company’s Targeted Antibody Payload, or TAP, technology, (ii) rights to future technological improvements, (iii) research activities to be performed on behalf of the collaborative partner, (iv) delivery of cytotoxic agents and (v) the manufacture of preclinical or clinical materials for the collaborative partner. Payments to the Company under these agreements may include non-refundable license fees, option fees, exercise fees, payments for research activities, payments for the manufacture of preclinical or clinical materials, payments based upon the achievement of certain milestones and royalties on product sales. The Company follows the provisions of the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 605-25, “Revenue Recognition — Multiple-Element Arrangements,” and ASC Topic 605-28, “Revenue Recognition — Milestone Method,” in accounting for these agreements. In order to account for these agreements, the Company must identify the deliverables included within the agreement and evaluate which deliverables represent separate units of accounting based on if certain criteria are met, including whether the delivered element has stand-alone value to the collaborator. The consideration received is allocated among the separate units of accounting, and the applicable revenue recognition criteria are applied to each of the separate units.

At September 30, 2012, the Company had the following two types of agreements with the parties identified below:

· Exclusive development and commercialization licenses to use the Company’s TAP technology and/or certain other intellectual property to develop compounds to a single target antigen (referred to herein as single-target licenses, as distinguished from the Company’s right-to-test agreements described elsewhere):

Amgen (two single-target licenses)

Bayer HealthCare (one single-target license)

Biotest (one single-target license)

Roche, through its Genentech unit (five single-target licenses)

Sanofi (license to multiple individual targets)

· Option/research agreement for a defined period of time to secure development and commercialization licenses to use the Company’s TAP technology to develop anticancer compounds to specified targets on established terms (referred to herein as right-to-test agreements):

Amgen

Sanofi

Novartis

Eli Lilly and Company

There are no performance, cancellation, termination or refund provisions in any of the arrangements that contain material financial consequences to the Company.

Exclusive Licenses

The deliverables under an exclusive license agreement generally include the exclusive license to the Company’s TAP technology with respect to a specified antigen target, and may also include deliverables related to rights to future technological improvements, research activities to be performed on behalf of the collaborative partner and the manufacture of preclinical or clinical materials for the collaborative partner.

Generally, exclusive license agreements contain non-refundable terms for payments and, depending on the terms of the agreement, provide that the Company will (i) at the collaborator’s request, provide research services at negotiated prices which are generally consistent with what other third parties would charge, (ii) at the collaborator’s request, manufacture and provide to it preclinical and clinical materials or deliver cytotoxic agents at negotiated prices which are generally consistent with what other third parties would charge, (iii) earn payments upon the achievement of certain milestones and (iv) earn royalty payments, generally until the later of the last applicable patent expiration or 10 to 12 years after product launch. In the case of trastuzumab emtansine (T-DM1), however, the minimum royalty term is 10 years and the maximum royalty term is 12 years on a country-by-country basis. Royalty rates may vary over the royalty term depending on the Company’s intellectual property rights. The Company may provide technical assistance and share any technology improvements with its collaborators during the term of the collaboration agreements. The Company does not directly control when any collaborator will request research or manufacturing services, achieve milestones or become liable for royalty payments. As a result, the Company cannot predict when it will recognize revenues in connection with any of the foregoing.

In determining the units of accounting, management evaluates whether the exclusive license has stand-alone value from the undelivered elements to the collaborative partner based on the consideration of the relevant facts and circumstances for each arrangement. Factors considered in this determination include the research capabilities of the partner and the availability of TAP technology research expertise in the general marketplace. If the Company concludes that the license has stand alone value and therefore will be accounted for as a separate unit of accounting, the Company then determines the estimated selling prices of the license and all other units of accounting based on market conditions, similar arrangements entered into by third parties, and entity-specific factors such as the terms of the Company’s previous collaborative agreements, recent preclinical and clinical testing results of therapeutic products that use the Company’s TAP technology, the Company’s pricing practices and pricing objectives, the likelihood that technological improvements will be made, the likelihood that technological improvements made will be used by the Company’s collaborators and the nature of the research services to be performed on behalf of its collaborators and market rates for similar services.

Upfront payments on single-target licenses are deferred if facts and circumstances dictate that the license does not have stand-alone value. Prior to the adoption of Accounting Standards Update (ASU) No. 2009-13, “Revenue Arrangements with Multiple Deliverables” on July 1, 2010, the Company determined that its licenses lacked stand-alone value and were combined with other elements of the arrangement and any amounts associated with the license were deferred and amortized over a certain period, which the Company refers to as the Company’s period of substantial involvement. The determination of the length of the period over which to defer revenue is subject to judgment and estimation and can have an impact on the amount of revenue recognized in a given period. Historically the Company’s involvement with the development of a collaborator’s product candidate has been significant at the early stages of development, and lessens as it progresses into clinical trials. Also, as a drug candidate gets closer to commencing pivotal testing the Company’s collaborators have sought an alternative site to manufacture the product, as the Company’s facility does not produce pivotal or commercial drug product. Accordingly, the Company generally estimates this period of substantial involvement to begin at the inception of the collaboration agreement and conclude at the end of non-pivotal Phase II testing. The Company believes this period of substantial involvement is, depending on the nature of the license, on average six and one-half years. Quarterly, the Company reassesses its periods of substantial involvement over which the Company amortizes its upfront license fees and makes adjustments as appropriate. In the event a collaborator elects to discontinue development of a specific product candidate under a single target license, but retains its right to use the Company’s technology to develop an alternative product candidate to the same target or a target substitute, the Company would cease amortization of any remaining portion of the upfront fee until there is substantial preclinical activity on another product candidate and its remaining period of substantial involvement can be estimated. In the event that a single target license were to be terminated, the Company would recognize as revenue any portion of the upfront fee that had not previously been recorded as revenue, but was classified as deferred revenue, at the date of such termination.

Subsequent to the adoption of ASU No. 2009-13, the Company determined that its research licenses lack stand-alone value and are considered for aggregation with the other elements of the arrangement and accounted for as one unit of accounting.

Upfront payments on single-target licenses may be recognized upon delivery of the license if facts and circumstances dictate that the license has stand-alone value from the undelivered elements, which generally include rights to future technological improvements, research services, delivery of cytotoxic agents and the manufacture of preclinical and clinical materials.

The Company recognizes revenue related to research services that represent separate units of accounting as they are performed, as long as there is persuasive evidence of an arrangement, the fee is fixed or determinable, and collection of the related receivable is probable. The Company recognizes revenue related to the rights to future technological improvements over the estimated term of the applicable license.

The Company may also provide cytotoxic agents to its collaborators or produce preclinical and clinical materials at negotiated prices which are generally consistent with what other third parties would charge. The Company recognizes revenue on cytotoxic agents and on preclinical and clinical materials when the materials have passed all quality testing required for collaborator acceptance and title and risk of loss have transferred to the collaborator. Arrangement consideration allocated to the manufacture of preclinical and clinical materials in a multiple-deliverable arrangement is below the Company’s full cost, and the Company’s full cost is not expected to ever be below its contract selling prices for its existing collaborations. During the three months ended September 30, 2012, the difference between the Company’s full cost to manufacture preclinical and clinical materials on behalf of its collaborators as compared to total amounts received from collaborators for the manufacture of preclinical and clinical materials was $755,000. There were no sales of manufactured preclinical or clinical materials during the three months ended September 30, 2011. The majority of the Company’s costs to produce these preclinical and clinical materials are fixed and then allocated to each batch based on the number of batches produced during the period. Therefore, the Company’s costs to produce these materials are significantly impacted by the number of batches produced during the period. The volume of preclinical and clinical materials the Company produces is directly related to the number of clinical trials the Company and its collaborators are preparing for or currently have underway, the speed of enrollment in those trials, the dosage schedule of each clinical trial and the time period such trials last. Accordingly, the volume of preclinical and clinical materials produced, and therefore the Company’s per batch costs to manufacture these preclinical and clinical materials, may vary significantly from period to period.

The Company may also produce research material for potential collaborators under material transfer agreements. Additionally, the Company performs research activities, including developing antibody specific conjugation processes, on behalf of its collaborators and potential collaborators during the early evaluation and preclinical testing stages of drug development. The Company records amounts received for research materials produced or services performed as a component of research and development support revenue. The Company also develops conjugation processes for materials for later stage testing and commercialization for certain collaborators. The Company is compensated at negotiated rates and may receive milestone payments for developing these processes which are recorded as a component of research and development support revenue.

The Company’s license agreements have milestone payments which for reporting purposes are aggregated into three categories: (i) development milestones, (ii) regulatory milestones, and (iii) sales milestones. Development milestones are typically payable when a product candidate initiates or advances into different clinical trial phases. Regulatory milestones are typically payable upon submission for marketing approval with the FDA or other countries’ regulatory authorities or on receipt of actual marketing approvals for the compound or for additional indications. Sales milestones are typically payable when annual sales reach certain levels.

At the inception of each agreement that includes milestone payments, the Company evaluates whether each milestone is substantive and at risk to both parties on the basis of the contingent nature of the milestone. This evaluation includes an assessment of whether (a) the consideration is commensurate with either (1) the entity’s performance to achieve the milestone, or (2) the enhancement of the value of the delivered item(s) as a result of a specific outcome resulting from the entity’s performance to achieve the milestone, (b) the consideration relates solely to past performance and (c) the consideration is reasonable relative to all of the deliverables and payment terms within the arrangement. The Company evaluates factors such as the scientific, regulatory, commercial and other risks that must be overcome to achieve the respective milestone, the level of effort and investment required to achieve the respective milestone and whether the milestone consideration is reasonable relative to all deliverables and payment terms in the arrangement in making this assessment.

Non-refundable development and regulatory milestones that are expected to be achieved as a result of the Company’s efforts during the period of substantial involvement are considered substantive and are recognized as revenue upon the achievement of the milestone, assuming all other revenue recognition criteria are met. Milestones that are not considered substantive because we do not contribute effort to the achievement of such milestones are generally achieved after the period of substantial involvement and are recognized as revenue upon achievement of the milestone, as there are no undelivered elements remaining and no continuing performance obligations, assuming all other revenue recognition criteria are met.

Right-to-Test Agreements

The Company’s right-to-test agreements provide collaborators the right to (a) test the Company’s TAP technology for a defined period of time through a right-to-test, or research, license, (b) take options, for a defined period of time, to specified targets and (c) upon exercise of those options, secure or “take” licenses to develop and commercialize products for the specified targets on established terms. Under these agreements, fees may be due to the Company (i) at the inception of the arrangement (referred to as “upfront” fees or payments), (ii) upon taking an option with respect to a specific target (referred to as option fees or payments earned, if any, when the option is “taken”), (iii) upon the exercise of a previously taken option to acquire a development and commercialization license(s) (referred to as exercise fees or payments earned, if any, when the development and commercialization license is “taken”), or (iv) some combination of all of these fees.

The accounting for right-to-test agreements is dependent on the nature of the options granted to the collaborative partner. Options are considered substantive if, at the inception of a right-to-test agreement, the Company is at risk as to whether the collaborative partner will choose to exercise the options to secure development and commercialization licenses. Factors that are considered in evaluating whether options are substantive include the overall objective of the arrangement, the benefit the collaborator might obtain from the agreement without exercising the options, the cost to exercise the options relative to the total upfront consideration, and the additional financial commitments or economic penalties imposed on the collaborator as a result of exercising the options.

For right-to-test agreements where the options to secure development and commercialization licenses to the Company’s TAP technology are considered substantive, the Company does not consider the development and commercialization licenses to be a deliverable at the inception of the agreement. For those right-to-test agreements entered into prior to the adoption of ASU No. 2009-13 where the options to secure development and commercialization licenses are considered substantive, the Company has deferred the upfront payments received and recognizes this revenue over the period during which the collaborator could elect to take options for development and commercialization licenses. These periods are specific to each collaboration agreement. If a collaborator takes an option to acquire a development and commercialization license under these agreements, any substantive option fee is deferred and recognized over the life of the option, generally 12 to 18 months. If a collaborator exercises an option and takes a development and commercialization license to a specific target, the Company attributes the exercise fee to the development and commercialization license. Upon exercise of an option to acquire a development and commercialization license, the Company would also attribute any remaining deferred option fee to the development and commercialization license and apply the multiple-element revenue recognition criteria to the development and commercialization license and any other deliverables to determine the appropriate revenue recognition, which will be consistent with the Company’s accounting policy for upfront payments on single-target licenses. In the event a right-to-test agreement were to be terminated, the Company would recognize as revenue any portion of the upfront fee that had not previously been recorded as revenue, but was classified as deferred revenue, at the date of such termination. None of the Company’s right-to-test agreements entered into subsequent to the adoption of ASU No. 2009-13 has been determined to contain substantive options.

For right-to-test agreements where the options to secure development and commercialization licenses to the Company’s TAP technology are not considered substantive, the Company considers the development and commercialization licenses to be a deliverable at the inception of the agreement and applies the multiple-element revenue recognition criteria to determine the appropriate revenue recognition. None of the Company’s right-to-test agreements entered into prior to the adoption of ASU No. 2009-13 has been determined to contain non-substantive options.

The Company does not directly control when any collaborator will exercise its options for development and commercialization licenses. As a result, the Company cannot predict when it will recognize revenues in connection with any of the foregoing.

Fair Value of Financial Instruments

Fair value is defined under ASC Topic 820, “Fair Value Measurements and Disclosures,” as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The standard describes a fair value hierarchy to measure fair value which is based on three levels of inputs, of which the first two are considered observable and the last unobservable, as follows:

· Level 1 - Quoted prices in active markets for identical assets or liabilities.

· Level 2 - Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

· Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

As of September 30, 2012, the Company held certain assets that are required to be measured at fair value on a recurring basis. The following table represents the fair value hierarchy for the Company’s financial assets measured at fair value on a recurring basis as of September 30, 2012 (in thousands):

	Fair Value Measurements at September 30, 2012 Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Cash, cash equivalents and restricted cash	$	236,164	$	236,164	$	—	$	—

As of June 30, 2012, the Company held certain assets that are required to be measured at fair value on a recurring basis. The following table represents the fair value hierarchy for the Company’s financial assets measured at fair value on a recurring basis as of June 30, 2012 (in thousands):

	Fair Value Measurements at June 30, 2012 Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Cash, cash equivalents and restricted cash	$	163,488	$	163,488	$	—	$	—

The fair value of the Company’s cash equivalents is based primarily on quoted prices from active markets.

Unbilled Revenue

The majority of the Company’s unbilled revenue at September 30, 2012 and June 30, 2012 represents research funding earned prior to those dates based on actual resources utilized under the Company’s agreements with various collaborators.

Inventory

Inventory costs relate to clinical trial materials being manufactured for sale to the Company’s collaborators. Inventory is stated at the lower of cost or market as determined on a first-in, first-out (FIFO) basis.

Inventory at September 30, 2012 and June 30, 2012 is summarized below (in thousands):

	September 30, 2012		June 30, 2012

Raw materials	$	170	$	129
Work in process	—		1,159

Total	$	170	$	1,288

Raw materials inventory consists entirely of DM1 or DM4, the Company’s proprietary cell-killing agents, which are included in all TAP product candidates currently in preclinical and clinical testing with the Company’s collaborators. The Company considers more than a twelve month supply of raw materials that is not supported by firm, fixed orders and/or projections from its collaborators to be excess and establishes a reserve to reduce to zero the value of any such excess raw material inventory with a corresponding charge to research and development expense. In accordance with this policy, during the three-month periods ended September 30, 2012 and 2011 the Company recorded $390,000 and $748,000, respectively, of expense related to excess inventory.

Work in process inventory consists of bulk drug substance manufactured for sale to the Company’s collaborators to be used in preclinical and clinical studies. All bulk drug substance is made to order at the request of the collaborators and subject to the terms and conditions of respective supply agreements. As such, no reserve for work in process inventory is required.

Computation of Net Loss per Common Share

Basic and diluted net loss per share is calculated based upon the weighted average number of common shares outstanding during the period. The Company’s common stock equivalents, as calculated in accordance with the treasury-stock method, are shown in the following table (in thousands):

	Three Months Ended September 30,
	2012	2011
Options outstanding to purchase common stock	7,960	7,762

Common stock equivalents under treasury stock method	2,552	2,743

The Company’s common stock equivalents have not been included in the net loss per share calculation because their effect is anti-dilutive due to the Company’s net loss position.

Stock-Based Compensation

As of September 30, 2012, the Company is authorized to grant future awards under one employee share-based compensation plan, which is the ImmunoGen, Inc. 2006 Employee, Director and Consultant Equity Incentive Plan, or the 2006 Plan. The 2006 Plan provides for the issuance of Stock Grants, the grant of Options and the grant of Stock-Based Awards for up to 8,500,000 shares of the Company’s common stock, as well as any shares of common stock that are represented by awards granted under the previous stock option plan, the ImmunoGen, Inc. Restated Stock Option Plan, or the Former Plan, that are forfeited, expire or are cancelled without delivery of shares of common stock; provided, however, that no more than 5,900,000 shares shall be added to the Plan from the Former Plan, pursuant to this provision. Option awards are granted with an exercise price equal to the market price of the Company’s stock at the date of grant. Options vest at various periods of up to four years and may be exercised within ten years of the date of grant.

The stock-based awards are accounted for under ASC Topic 718, “Compensation—Stock Compensation.” Pursuant to Topic 718, the estimated grant date fair value of awards is charged to the statement of operations and comprehensive loss over the requisite service period, which is the vesting period. Such amounts have been reduced by an estimate of forfeitures of all unvested awards. The fair value of each stock option is estimated on the date of grant using the Black-Scholes option-pricing model with the assumptions noted in the following table. As the Company has not paid dividends since inception, nor does it expect to pay any dividends for the foreseeable future, the expected dividend yield assumption is zero. Expected volatility is based exclusively on historical volatility data of the Company’s stock. The expected term of stock options granted is based exclusively on historical data and represents the period of time that stock options granted are expected to be outstanding. The expected term is calculated for and applied to one group of stock options as the Company does not expect substantially different exercise or post-vesting termination behavior among its option recipients. The risk-free rate of the stock options is based on the U.S. Treasury rate in effect at the time of grant for the expected term of the stock options.

	Three Months Ended September 30,
	2012	2011
Dividend	None	None
Volatility	60.44%	59.79%
Risk-free interest rate	0.84%	2.25%
Expected life (years)	6.3	7.1

Using the Black-Scholes option-pricing model, the weighted average grant date fair values of options granted during the three months ended September 30, 2012 and 2011 were $8.91 and $9.15 per share, respectively.

Stock compensation expense related to stock options granted under the 2006 Plan was $3.8 million and $2.5 million during the three months ended September 30, 2012 and 2011, respectively. The increase in stock compensation expense from period to period is primarily due to higher stock prices driving higher fair values.

As of September 30, 2012, the estimated fair value of unvested employee awards was $22.5 million, net of estimated forfeitures. The weighted-average remaining vesting period for these awards is approximately two and a half years.

During the three months ended September 30, 2012, holders of options issued under the Company’s equity plans exercised their rights to acquire an aggregate of approximately 108,000 shares of common stock at prices ranging from $2.91 to $15.20 per share. The total proceeds to the Company from these option exercises were approximately $688,000.

Financial Instruments and Concentration of Credit Risk

The Company’s cash equivalents consist principally of money market funds with underlying investments primarily being U.S. Government-issued securities and high quality, short-term commercial paper. All of the Company’s cash and cash equivalents are maintained with three financial institutions in the U.S.

Derivative instruments include a portfolio of short duration foreign currency forward contracts intended to mitigate the risk of exchange fluctuations for existing or anticipated receivable and payable balances denominated in foreign currency. Derivatives are estimated at fair value and classified as other current assets or liabilities. The fair values of these instruments represent the present value of estimated future cash flows under the contracts, which are a function of underlying interest rates, currency rates, related volatility, counterparty creditworthiness and duration of the contracts. Changes in these factors or a combination thereof may affect the fair value of these instruments.

The Company does not designate foreign currency forward contracts as hedges for accounting purposes, and changes in the fair value of these instruments are recognized in earnings during the period of change. Because the Company enters into forward contracts only as an economic hedge, any gain or loss on the underlying foreign-denominated existing or anticipated receivable or payable balance would be offset by the loss or gain on the forward contract. For the three months ended September 30, 2012 and 2011, net losses recognized on forward contracts were $2,000 and $44,000, respectively, and are included in the accompanying consolidated statements of operations and comprehensive loss as other income (expense), net. As of September 30, 2012, the Company had outstanding forward contracts with notional amounts equivalent to approximately $6.8 million (€5.3 million), all maturing on or before October 7, 2013. As of June 30, 2012, the Company had outstanding forward contracts with notional amounts equivalent to approximately $3.3 million (€2.5 million). The Company does not anticipate using derivative instruments for any purpose other than hedging exchange rate exposure.

Segment Information

During the three months ended September 30, 2012, the Company continued to operate in one reportable business segment which is the business of discovery of monoclonal antibody-based anticancer therapeutics.

The percentages of revenues recognized from significant customers of the Company in the three months ended September 30, 2012 and 2011 are included in the following table:

	Three Months Ended September 30,
Collaborative Partner:	2012	2011
Amgen	23%	26%
Bayer HealthCare	20%	21%
Biogen Idec	—%	11%
Biotest	23%	6%
Novartis	24%	22%
Sanofi	4%	12%

There were no other customers of the Company with significant revenues in the three months ended September 30, 2012 and 2011.

- Definition

The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

+ References+ Details

Collaborative Agreements

3 Months Ended

Sep. 30, 2012

Collaborative Agreements

Collaborative Agreements

B. Collaborative Agreements

For information related to the Company’s significant collaborative arrangements, please read Note C, Agreements to our consolidated financial statements included within the Company’s 2012 Form 10-K.

Capital Stock

3 Months Ended

Sep. 30, 2012

Capital Stock

Capital Stock

C. Capital Stock

2001 Non-Employee Director Stock Plan

During the three months ended September 30, 2012 and 2011, the Company recorded approximately $14,000 and $19,000 in expense reduction, respectively, related to stock units outstanding under the Company’s 2001 Non-Employee Director Stock Plan, or the 2001 Plan. The value of the stock units is adjusted to market value at each reporting period as the redemption amount of stock units for this plan will be paid in cash. No stock units have been issued under the 2001 Plan subsequent to June 30, 2004.

Compensation Policy for Non-Employee Directors

During the three months ended September 30, 2012 and 2011, the Company recorded approximately $78,000 and $84,000 in compensation expense, respectively, related to deferred share units issued and outstanding under the Company’s Compensation Policy for Non-Employee Directors. Pursuant to the Compensation Policy for Non-Employee Directors, the redemption amount of deferred share units issued will be paid in shares of common stock of the Company on the date a director ceases to be a member of the Board. Annual retainers vest quarterly over approximately one year from the date of grant, contingent upon the individual remaining a director of ImmunoGen as of each vesting date, and the number of deferred share units awarded is based on the market value of the Company’s common stock on the date of the award. All unvested deferred stock awards will automatically vest immediately prior to the occurrence of a change of control.

In addition to the deferred share units, the Non-Employee Directors are also entitled to receive stock option awards having a grant date fair value of $30,000, determined using the Black-Scholes option pricing model measured on the date of grant, which would be the date of the annual meeting of shareholders. These options will vest quarterly over approximately one year from the date of grant. Any new directors will receive a pro-rated award, depending on their date of election to the Board. The directors received a total of 33,187 and 49,688 options in fiscal 2012 and fiscal 2011, respectively, and the related compensation expense for the three months ended September 30, 2012 and 2011 is included in the amounts discussed in the “Stock-Based Compensation” section of footnote A above.

Commitments and Contingencies

3 Months Ended

Sep. 30, 2012

Commitments and Contingencies

Commitments and Contingencies

E. Commitments and Contingencies

Leases

Effective July 27, 2007, the Company entered into a lease agreement with Intercontinental Fund III for the rental of approximately 89,000 square feet of laboratory and office space at 830 Winter Street, Waltham, MA. The Company uses this space for its corporate headquarters, research and other operations. The initial term of the lease is for twelve years with an option for the Company to extend the lease for two additional terms of five years. The Company is required to pay certain operating expenses for the leased premises subject to escalation charges for certain expense increases over a base amount. The Company entered into a sublease in December 2009 for 14,100 square feet of this space in Waltham through January 2015, with the sublessee having a conditional option to extend the term for an additional two years.

Effective April 2012, the Company entered into a sublease agreement for the rental of 7,310 square feet of laboratory and office space at 830 Winter Street, Waltham, MA from Histogenics Corporation. The initial term of the sublease is for three years with a conditional option for the Company to extend the lease through October 2017. The Company is required to pay certain operating expenses for the leased premises subject to escalation charges for certain expense increases over a base amount.

At September 30, 2012, the Company also leases a facility consisting of 43,850 square feet in Norwood, MA under an agreement through 2018 with an option to extend the lease for an additional term of five years. The Company is required to pay certain operating expenses for the leased premises subject to escalation charges for certain expense increases over a base amount.

The minimum rental commitments for the Company’s facilities, including real estate taxes and other expenses, for the next five fiscal years and thereafter under the non-cancelable operating lease agreements discussed above are as follows (in thousands):

2013 (nine months remaining)	$	4,788
2014	6,473
2015	6,587
2016	6,352
2017	6,418
Thereafter	16,552
Total minimum lease payments	$	47,170
Total minimum rental payments from sublease	(1,590		)
Total minimum lease payments, net	$	45,580

Collaborative Agreements

The Company is contractually obligated to make potential future success-based regulatory milestone payments in conjunction with certain collaborative agreements. These payments are contingent upon the occurrence of certain future events and, given the nature of these events, it is unclear when, if ever, the Company may be required to pay such amounts. Further, the timing of any future payment is not reasonably estimable. During the current period, the Company’s license agreement with Janssen Biotech was terminated and, accordingly, the Company is no longer obligated to make $41.0 million of potential future success-based milestone and third-party payments under such agreement. As of September 30, 2012, the maximum amount that may be payable in the future under the Company’s current collaborative agreements is approximately $2.0 million.

- Definition

The entire disclosure for commitments and contingencies.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Sep. 30, 2012

Summary of Significant Accounting Policies

Basis of Presentation

Basis of Presentation

Subsequent Events

Subsequent Events

Revenue Recognition

Revenue Recognition

At September 30, 2012, the Company had the following two types of agreements with the parties identified below:

Amgen (two single-target licenses)

Bayer HealthCare (one single-target license)

Biotest (one single-target license)

Roche, through its Genentech unit (five single-target licenses)

Sanofi (license to multiple individual targets)

Amgen

Sanofi

Novartis

Eli Lilly and Company

There are no performance, cancellation, termination or refund provisions in any of the arrangements that contain material financial consequences to the Company.

Exclusive Licenses

Right-to-Test Agreements

Fair Value of Financial Instruments

Fair Value of Financial Instruments

· Level 1 - Quoted prices in active markets for identical assets or liabilities.

· Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

	Fair Value Measurements at September 30, 2012 Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Cash, cash equivalents and restricted cash	$	236,164	$	236,164	$	—	$	—

	Fair Value Measurements at June 30, 2012 Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Cash, cash equivalents and restricted cash	$	163,488	$	163,488	$	—	$	—

The fair value of the Company’s cash equivalents is based primarily on quoted prices from active markets.

Unbilled Revenue

Unbilled Revenue

Inventory

Inventory

Inventory at September 30, 2012 and June 30, 2012 is summarized below (in thousands):

	September 30, 2012		June 30, 2012

Raw materials	$	170	$	129
Work in process	—		1,159

Total	$	170	$	1,288

Computation of Net Loss Per Common Share

Computation of Net Loss per Common Share

	Three Months Ended September 30,
	2012	2011
Options outstanding to purchase common stock	7,960	7,762

Common stock equivalents under treasury stock method	2,552	2,743

The Company’s common stock equivalents have not been included in the net loss per share calculation because their effect is anti-dilutive due to the Company’s net loss position.

Stock-based Compensation

Stock-Based Compensation

	Three Months Ended September 30,
	2012	2011
Dividend	None	None
Volatility	60.44%	59.79%
Risk-free interest rate	0.84%	2.25%
Expected life (years)	6.3	7.1

Financial Instruments and Concentration of Credit Risk

Financial Instruments and Concentration of Credit Risk

Segment Information

Segment Information

The percentages of revenues recognized from significant customers of the Company in the three months ended September 30, 2012 and 2011 are included in the following table:

	Three Months Ended September 30,
Collaborative Partner:	2012	2011
Amgen	23%	26%
Bayer HealthCare	20%	21%
Biogen Idec	—%	11%
Biotest	23%	6%
Novartis	24%	22%
Sanofi	4%	12%

There were no other customers of the Company with significant revenues in the three months ended September 30, 2012 and 2011.

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Sep. 30, 2012

Summary of Significant Accounting Policies

Schedule of assets that are required to be measured at fair value on a recurring basis

	Fair Value Measurements at September 30, 2012 Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Cash, cash equivalents and restricted cash	$	236,164	$	236,164	$	—	$	—

	Fair Value Measurements at June 30, 2012 Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	Total		(Level 1)		(Level 2)		(Level 3)
Cash, cash equivalents and restricted cash	$	163,488	$	163,488	$	—	$	—

Schedule of inventory

	September 30, 2012		June 30, 2012

Raw materials	$	170	$	129
Work in process	—		1,159

Total	$	170	$	1,288

Schedule of common stock equivalents, as calculated in accordance with the treasury-stock method

	Three Months Ended September 30,
	2012	2011
Options outstanding to purchase common stock	7,960	7,762

Common stock equivalents under treasury stock method	2,552	2,743

Schedule of weighted-average assumptions used to estimate the fair value of each stock option

	Three Months Ended September 30,
	2012	2011
Dividend	None	None
Volatility	60.44%	59.79%
Risk-free interest rate	0.84%	2.25%
Expected life (years)	6.3	7.1

Schedule of percentage of total revenue recognized from each significant customer

	Three Months Ended September 30,
Collaborative Partner:	2012	2011
Amgen	23%	26%
Bayer HealthCare	20%	21%
Biogen Idec	—%	11%
Biotest	23%	6%
Novartis	24%	22%
Sanofi	4%	12%

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References+ Details

Commitments and Contingencies (Tables)

3 Months Ended

Sep. 30, 2012

Commitments and Contingencies

Minimum rental commitments for the next five fiscal years and thereafter under the non-cancelable operating lease agreements

2013 (nine months remaining)	$	4,788
2014	6,473
2015	6,587
2016	6,352
2017	6,418
Thereafter	16,552
Total minimum lease payments	$	47,170
Total minimum rental payments from sublease	(1,590		)
Total minimum lease payments, net	$	45,580

Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended
	Sep. 30, 2012 item
Revenue Recognition
Number of types of licensing and development agreements with collaborative partners	2
Exclusive Licenses
Revenue Recognition
Average involvement period over which the upfront payments on single-target licenses are amortized	6 years 6 months
Difference between the full cost to manufacture and amounts received from collaborators for preclinical and clinical materials	$ 755,000
Number of types of milestone payments under collaborative arrangements	3
Exclusive Licenses \| Minimum
Revenue Recognition
Period after product launch in which the company will earn royalty payments	10 years
T-DM1 royalty term on a country-by-country basis	10 years
Exclusive Licenses \| Maximum
Revenue Recognition
Period after product launch in which the company will earn royalty payments	12 years
T-DM1 royalty term on a country-by-country basis	12 years
Right-to-Test Agreements \| Minimum
Revenue Recognition
Average period over which upfront payments are deferred and recognized	12 months
Right-to-Test Agreements \| Maximum
Revenue Recognition
Average period over which upfront payments are deferred and recognized	18 months
Amgen \| Exclusive Licenses
Revenue Recognition
Number of single-target licenses	2
Bayer HealthCare \| Exclusive Licenses
Revenue Recognition
Number of single-target licenses	1
Biotest \| Exclusive Licenses
Revenue Recognition
Number of single-target licenses	1
Roche \| Exclusive Licenses
Revenue Recognition
Number of single-target licenses	5

Summary of Significant Accounting Policies (Details 2) (Recurring basis, USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012
Total
Fair value hierarchy for the Company's financial assets measured at fair value
Cash, cash equivalents and restricted cash	$ 236,164	$ 163,488
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair value hierarchy for the Company's financial assets measured at fair value
Cash, cash equivalents and restricted cash	$ 236,164	$ 163,488

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details

Summary of Significant Accounting Policies (Details 3) (USD $) Share data in Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012
Inventory
Raw materials	$ 170,000		$ 129,000
Work in process			1,159,000
Total	170,000		1,288,000
Minimum supply period of raw materials that is not supported by firm, fixed orders and/or projections from collaborators considered to expense inventory	12 months
Charges to research and development expense related to raw material inventory identified as excess	$ 390,000	$ 748,000
Computation of Net Loss Per Common Share
Options outstanding to purchase common stock (in shares)	7,960	7,762
Common stock equivalents under treasury stock method (in shares)	2,552	2,743

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Antidilution

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-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

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-Name Emerging Issues Task Force (EITF)

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+ Details

- Definition

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

+ References+ Details

- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References+ Details

Summary of Significant Accounting Policies (Details 4)	3 Months Ended					3 Months Ended
Summary of Significant Accounting Policies (Details 4)	Sep. 30, 2012 USD ($) item	Sep. 30, 2011 USD ($)	Sep. 30, 2012 EUR (€)	Jun. 30, 2012 USD ($)	Jun. 30, 2012 EUR (€)	Sep. 30, 2012 2006 Plan Stock options USD ($) item	Sep. 30, 2011 2006 Plan Stock options USD ($)	Sep. 30, 2012 2006 Plan Stock options Minimum USD ($)	Sep. 30, 2012 2006 Plan Stock options Maximum USD ($)
Stock-based Compensation
Number of employee share-based compensation plans						1
Common stock authorized for issuance (in shares)						8,500,000
Number of shares of common stock added to the Plan from the Former Plan						5,900,000
Vesting period									4 years
Exercise period									10 years
Weighted-average assumptions used to estimate the fair value of each stock option
Expected dividend yield assumption (as a percent)						0.00%
Number of group of awards for which expected term is calculated for and applied						1
Volatility (as a percent)						60.44%	59.79%
Risk-free interest rate (as a percent)						0.84%	2.25%
Expected life						6 years 3 months 18 days	7 years 1 month 6 days
Weighted-average grant date fair values of options granted (in dollars per share)						$ 8.91	$ 9.15
Stock compensation expense						$ 3,800,000	$ 2,500,000
Additional disclosure for options
Estimated fair value of unvested employee awards, net of estimated forfeitures						22,500,000
Weighted average vesting period of unvested employee awards						2 years 6 months
Number of options exercised (in shares)						108,000
Exercise price of options exercised (in dollars per share)								$ 2.91	$ 15.20
Cash received for exercise of stock options	688,000	716,000
Financial Instruments and Concentration of Credit Risk
Number of financial institutions in the U.S. in which cash and cash equivalents are primarily maintained	3
Net losses on forward contracts	2,000	44,000
Notional amounts of outstanding forward contracts	$ 6,800,000		€ 5,300,000	$ 3,300,000	€ 2,500,000