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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Revenues:        
License and milestone fees $ 41,417imgn_LicenseAndMilestoneFees $ 25,678imgn_LicenseAndMilestoneFees $ 47,651imgn_LicenseAndMilestoneFees $ 38,845imgn_LicenseAndMilestoneFees
Royalty revenue 4,625us-gaap_RoyaltyRevenue 2,335us-gaap_RoyaltyRevenue 8,791us-gaap_RoyaltyRevenue 4,388us-gaap_RoyaltyRevenue
Research and development support 832imgn_ResearchAndDevelopmentRevenue 1,922imgn_ResearchAndDevelopmentRevenue 1,608imgn_ResearchAndDevelopmentRevenue 3,912imgn_ResearchAndDevelopmentRevenue
Clinical materials revenue 1,426us-gaap_ReimbursementRevenue 125us-gaap_ReimbursementRevenue 3,453us-gaap_ReimbursementRevenue 133us-gaap_ReimbursementRevenue
Total revenues 48,300us-gaap_Revenues 30,060us-gaap_Revenues 61,503us-gaap_Revenues 47,278us-gaap_Revenues
Operating Expenses:        
Research and development 27,647us-gaap_ResearchAndDevelopmentExpense 20,862us-gaap_ResearchAndDevelopmentExpense 55,665us-gaap_ResearchAndDevelopmentExpense 42,891us-gaap_ResearchAndDevelopmentExpense
General and administrative 6,872us-gaap_GeneralAndAdministrativeExpense 5,447us-gaap_GeneralAndAdministrativeExpense 13,967us-gaap_GeneralAndAdministrativeExpense 11,973us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 34,519us-gaap_OperatingExpenses 26,309us-gaap_OperatingExpenses 69,632us-gaap_OperatingExpenses 54,864us-gaap_OperatingExpenses
Income (loss) from operations 13,781us-gaap_OperatingIncomeLoss 3,751us-gaap_OperatingIncomeLoss (8,129)us-gaap_OperatingIncomeLoss (7,586)us-gaap_OperatingIncomeLoss
Other income, net (146)us-gaap_OtherNonoperatingIncomeExpense 62us-gaap_OtherNonoperatingIncomeExpense (518)us-gaap_OtherNonoperatingIncomeExpense 172us-gaap_OtherNonoperatingIncomeExpense
Net income (loss) 13,635us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 3,813us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (8,647)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (7,414)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic and diluted net income (loss) per common share (in dollars per share) $ 0.16us-gaap_EarningsPerShareBasicAndDiluted $ 0.04us-gaap_EarningsPerShareBasicAndDiluted $ (0.10)us-gaap_EarningsPerShareBasicAndDiluted $ (0.09)us-gaap_EarningsPerShareBasicAndDiluted
Basic weighted average common shares outstanding (in shares) 85,935us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 85,431us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 85,904us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 85,221us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive impact of potential common shares (in shares) 730us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,845us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment    
Diluted weighted average common shares outstanding (in shares) 86,665us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 87,276us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 85,904us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 85,221us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Total comprehensive income (loss) $ 13,635us-gaap_ComprehensiveIncomeNetOfTax $ 3,813us-gaap_ComprehensiveIncomeNetOfTax $ (8,647)us-gaap_ComprehensiveIncomeNetOfTax $ (7,414)us-gaap_ComprehensiveIncomeNetOfTax