2021 Form 10-K Financial Statement

#000155837022002358 Filed on February 28, 2022

View on sec.gov

Income Statement

Concept 2021 2020 Q4 2020

Balance Sheet

Concept 2021 2020 Q4 2020
SHORT-TERM ASSETS
Cash & Short-Term Investments $478.8M $293.9M $293.9M
YoY Change 62.9% 66.78% 66.8%
Cash & Equivalents $478.8M $293.9M $293.9M
Short-Term Investments $0.00
Other Short-Term Assets $7.322M $7.900M $7.900M
YoY Change -7.32% 46.3% 46.3%
Inventory
Prepaid Expenses
Receivables $9.812M $0.00 $0.00
Other Receivables $4.115M $22.50M $22.50M
Total Short-Term Assets $500.0M $324.3M $324.3M
YoY Change 54.18% 55.22% 55.24%
LONG-TERM ASSETS
Property, Plant & Equipment $17.06M $5.760M $19.80M
YoY Change -13.86% -17.63% -12.39%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets $8.711M $10.99M $11.00M
YoY Change -20.81% 190.33% 189.47%
Total Long-Term Assets $25.77M $30.82M $30.80M
YoY Change -16.34% 16.89% 16.67%
TOTAL ASSETS
Total Short-Term Assets $500.0M $324.3M $324.3M
Total Long-Term Assets $25.77M $30.82M $30.80M
Total Assets $525.8M $355.1M $355.1M
YoY Change 48.06% 50.93% 50.91%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable $18.43M $9.538M $9.500M
YoY Change 94.04% -3.98% -4.04%
Accrued Expenses $32.08M $37.10M $37.10M
YoY Change -13.52% 43.24% 43.24%
Deferred Revenue $29.25M
YoY Change 9365.7%
Short-Term Debt $0.00 $0.00 $0.00
YoY Change
Long-Term Debt Due $6.100M $2.100M $2.100M
YoY Change 190.48%
Total Short-Term Liabilities $100.9M $122.3M $122.3M
YoY Change -17.46% 58.02% 58.01%
LONG-TERM LIABILITIES
Long-Term Debt $0.00 $0.00 $0.00
YoY Change -100.0% -100.0%
Other Long-Term Liabilities $99.23M $2.586M $143.2M
YoY Change -30.7% 265.77% -38.25%
Total Long-Term Liabilities $99.23M $2.586M $143.2M
YoY Change -30.7% 265.77% -38.8%
TOTAL LIABILITIES
Total Short-Term Liabilities $100.9M $122.3M $122.3M
Total Long-Term Liabilities $99.23M $2.586M $143.2M
Total Liabilities $200.2M $265.5M $265.5M
YoY Change -24.6% -14.73% -14.74%
SHAREHOLDERS EQUITY
Retained Earnings -$1.332B
YoY Change 3.45%
Common Stock $1.421B
YoY Change 17.34%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity $325.6M $89.57M $89.60M
YoY Change
Total Liabilities & Shareholders Equity $525.8M $355.1M $355.1M
YoY Change 48.06% 50.93% 50.91%

Cashflow Statement

Concept 2021 2020 Q4 2020

Facts In Submission

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-17323000
CY2019 us-gaap Increase Decrease In Contract With Customer Liability
IncreaseDecreaseInContractWithCustomerLiability
46630000
CY2021 imgn Operating Lease Liability Amortization
OperatingLeaseLiabilityAmortization
-3016000
CY2020 imgn Operating Lease Liability Amortization
OperatingLeaseLiabilityAmortization
-2972000
CY2019 imgn Operating Lease Liability Amortization
OperatingLeaseLiabilityAmortization
-2505000
CY2021 us-gaap Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
-169416000
CY2020 us-gaap Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
-78620000
CY2019 us-gaap Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
-88367000
CY2021 us-gaap Payments To Acquire Property Plant And Equipment
PaymentsToAcquirePropertyPlantAndEquipment
1434000
CY2020 us-gaap Payments To Acquire Property Plant And Equipment
PaymentsToAcquirePropertyPlantAndEquipment
917000
CY2019 us-gaap Payments To Acquire Property Plant And Equipment
PaymentsToAcquirePropertyPlantAndEquipment
2845000
CY2020 us-gaap Proceeds From Sale Of Machinery And Equipment
ProceedsFromSaleOfMachineryAndEquipment
1426000
CY2019 us-gaap Proceeds From Sale Of Machinery And Equipment
ProceedsFromSaleOfMachineryAndEquipment
2312000
CY2021 us-gaap Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
-1434000
CY2020 us-gaap Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
509000
CY2019 us-gaap Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
-533000
CY2021 us-gaap Repayments Of Convertible Debt
RepaymentsOfConvertibleDebt
1100000
CY2021 us-gaap Proceeds From Stock Options Exercised
ProceedsFromStockOptionsExercised
3769000
CY2020 us-gaap Proceeds From Stock Options Exercised
ProceedsFromStockOptionsExercised
1471000
CY2019 us-gaap Proceeds From Stock Options Exercised
ProceedsFromStockOptionsExercised
2873000
CY2021 us-gaap Payments Of Loan Costs
PaymentsOfLoanCosts
391000
CY2021 us-gaap Proceeds From Issuance Of Warrants
ProceedsFromIssuanceOfWarrants
199045000
CY2021 us-gaap Payments Of Stock Issuance Costs
PaymentsOfStockIssuanceCosts
373000
CY2020 us-gaap Payments Of Stock Issuance Costs
PaymentsOfStockIssuanceCosts
701000
CY2021 us-gaap Proceeds From Issuance Of Common Stock
ProceedsFromIssuanceOfCommonStock
154030000
CY2020 us-gaap Proceeds From Issuance Of Common Stock
ProceedsFromIssuanceOfCommonStock
194271000
CY2021 us-gaap Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
355744000
CY2020 us-gaap Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
195742000
CY2019 us-gaap Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
2873000
CY2021 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
184894000
CY2020 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
117631000
CY2019 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
-86027000
CY2020Q4 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
293856000
CY2019Q4 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
176225000
CY2018Q4 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
262252000
CY2021Q4 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
478750000
CY2020Q4 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
293856000
CY2019Q4 us-gaap Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
176225000
CY2021 us-gaap Interest Paid Net
InterestPaidNet
47000
CY2020 us-gaap Interest Paid Net
InterestPaidNet
95000
CY2019 us-gaap Interest Paid Net
InterestPaidNet
95000
CY2021 us-gaap Profit Loss
ProfitLoss
-139300000
CY2021Q4 us-gaap Retained Earnings Accumulated Deficit
RetainedEarningsAccumulatedDeficit
-1500000000
CY2021Q4 us-gaap Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
478800000
CY2021 imgn Current Capital Resources To Meet Operational Expenses And Capital Expenditures Expected Period
CurrentCapitalResourcesToMeetOperationalExpensesAndCapitalExpendituresExpectedPeriod
P12M
CY2021 us-gaap Use Of Estimates
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<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;padding-left:18pt;text-indent:-18pt;margin:0pt 0pt 6pt 36pt;"><i style="font-style:italic;">Use of Estimates</i></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-indent:36pt;margin:0pt 0pt 6pt 0pt;">The preparation of financial statements in conformity with accounting principles generally accepted in the United States (U.S.) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.</p>
CY2021Q4 us-gaap Revenue Remaining Performance Obligation
RevenueRemainingPerformanceObligation
92100000
CY2021Q4 us-gaap Revenue Remaining Performance Obligation Percentage
RevenueRemainingPerformanceObligationPercentage
0.48
CY2021Q4 us-gaap Revenue Remaining Performance Obligation Percentage
RevenueRemainingPerformanceObligationPercentage
0.41
CY2021Q4 us-gaap Revenue Remaining Performance Obligation Percentage
RevenueRemainingPerformanceObligationPercentage
0.11
CY2021 us-gaap Contract With Customer Asset Increase Decrease For Contract Acquired In Business Combination
ContractWithCustomerAssetIncreaseDecreaseForContractAcquiredInBusinessCombination
-5500000
CY2021 us-gaap Contract With Customer Asset Reclassified To Receivable
ContractWithCustomerAssetReclassifiedToReceivable
-2500000
CY2021Q4 us-gaap Contract With Customer Asset Gross Current
ContractWithCustomerAssetGrossCurrent
3000000
CY2020Q4 us-gaap Contract With Customer Liability
ContractWithCustomerLiability
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CY2021 us-gaap Contract With Customer Liability Increase Decrease For Contract Acquired In Business Combination
ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination
4753000
CY2021 us-gaap Contract With Customer Liability Change In Timeframe Performance Obligation Satisfied Revenue Recognized
ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized
22794000
CY2021Q4 us-gaap Contract With Customer Liability
ContractWithCustomerLiability
92068000
CY2019Q4 us-gaap Contract With Customer Asset Gross Current
ContractWithCustomerAssetGrossCurrent
3631000
CY2020 us-gaap Contract With Customer Asset Reclassified To Receivable
ContractWithCustomerAssetReclassifiedToReceivable
-8000000
CY2020Q4 imgn Contract Asset Impact Of Netting
ContractAssetImpactOfNetting
4369000
CY2019Q4 us-gaap Contract With Customer Liability
ContractWithCustomerLiability
127432000
CY2020 us-gaap Contract With Customer Liability Increase Decrease For Contract Acquired In Business Combination
ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination
42050000
CY2020 us-gaap Contract With Customer Liability Change In Timeframe Performance Obligation Satisfied Revenue Recognized
ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized
63742000
CY2020Q4 imgn Contract Liabilities Impact Of Netting
ContractLiabilitiesImpactOfNetting
4369000
CY2020Q4 us-gaap Contract With Customer Liability
ContractWithCustomerLiability
110109000
CY2021 us-gaap Contract With Customer Liability Revenue Recognized
ContractWithCustomerLiabilityRevenueRecognized
22765000
CY2020 us-gaap Contract With Customer Liability Revenue Recognized
ContractWithCustomerLiabilityRevenueRecognized
61872000
CY2019 us-gaap Contract With Customer Liability Revenue Recognized
ContractWithCustomerLiabilityRevenueRecognized
14817000
CY2021 us-gaap Contract With Customer Performance Obligation Satisfied In Previous Period
ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod
5500000
CY2019 us-gaap Contract With Customer Performance Obligation Satisfied In Previous Period
ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod
12672000
CY2020Q4 us-gaap Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
293900000
CY2021 us-gaap Capital Expenditures Incurred But Not Yet Paid
CapitalExpendituresIncurredButNotYetPaid
200000
CY2020 us-gaap Capital Expenditures Incurred But Not Yet Paid
CapitalExpendituresIncurredButNotYetPaid
700000
CY2021 imgn Cash And Cash Equivalents Number Of Financial Institutions
CashAndCashEquivalentsNumberOfFinancialInstitutions
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CY2020Q4 us-gaap Marketable Securities
MarketableSecurities
0
CY2021Q4 us-gaap Marketable Securities
MarketableSecurities
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CY2021Q4 us-gaap Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
478800000
CY2021 imgn Number Of Trades Impacting Fair Value Of Financial Instruments
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0
CY2021Q4 us-gaap Common Stock Par Or Stated Value Per Share
CommonStockParOrStatedValuePerShare
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CY2021Q3 us-gaap Repayments Of Convertible Debt
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1100000
CY2021Q4 us-gaap Finance Lease Liability
FinanceLeaseLiability
0
CY2021Q4 imgn Accrued Contract Payments Current
AccruedContractPaymentsCurrent
5558000
CY2020Q4 imgn Accrued Contract Payments Current
AccruedContractPaymentsCurrent
15576000
CY2021Q4 imgn Accrued Clinical Trial Costs Current
AccruedClinicalTrialCostsCurrent
15556000
CY2020Q4 imgn Accrued Clinical Trial Costs Current
AccruedClinicalTrialCostsCurrent
11401000
CY2021Q4 us-gaap Accrued Professional Fees Current
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839000
CY2020Q4 us-gaap Accrued Professional Fees Current
AccruedProfessionalFeesCurrent
1200000
CY2021Q4 us-gaap Accrued Employee Benefits Current
AccruedEmployeeBenefitsCurrent
40000
CY2020Q4 us-gaap Accrued Employee Benefits Current
AccruedEmployeeBenefitsCurrent
39000
CY2021Q4 imgn Accrued Public Reporting Charges Current
AccruedPublicReportingChargesCurrent
309000
CY2020Q4 imgn Accrued Public Reporting Charges Current
AccruedPublicReportingChargesCurrent
319000
CY2021Q4 imgn Other Current Accrued Liabilities
OtherCurrentAccruedLiabilities
775000
CY2020Q4 imgn Other Current Accrued Liabilities
OtherCurrentAccruedLiabilities
785000
CY2021Q4 us-gaap Other Accrued Liabilities Current
OtherAccruedLiabilitiesCurrent
23077000
CY2020Q4 us-gaap Other Accrued Liabilities Current
OtherAccruedLiabilitiesCurrent
29320000
CY2019 us-gaap Asset Impairment Charges
AssetImpairmentCharges
2500000
CY2020 us-gaap Asset Impairment Charges
AssetImpairmentCharges
0
CY2021 us-gaap Asset Impairment Charges
AssetImpairmentCharges
0
CY2021 imgn Share Based Compensation Arrangement By Share Based Payment Award Awards Outstanding Number
ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsOutstandingNumber
21296000
CY2020 imgn Share Based Compensation Arrangement By Share Based Payment Award Awards Outstanding Number
ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsOutstandingNumber
18459000
CY2019 imgn Share Based Compensation Arrangement By Share Based Payment Award Awards Outstanding Number
ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardsOutstandingNumber
14815000
CY2021 us-gaap Incremental Common Shares Attributable To Share Based Payment Arrangements
IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
2546000
CY2020 us-gaap Incremental Common Shares Attributable To Share Based Payment Arrangements
IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
1301000
CY2019 us-gaap Incremental Common Shares Attributable To Share Based Payment Arrangements
IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
1020000
CY2020 us-gaap Debt Instrument Convertible Number Of Equity Instruments
DebtInstrumentConvertibleNumberOfEquityInstruments
501000
CY2019 us-gaap Debt Instrument Convertible Number Of Equity Instruments
DebtInstrumentConvertibleNumberOfEquityInstruments
501000
CY2020 us-gaap Incremental Common Shares Attributable To Conversion Of Debt Securities
IncrementalCommonSharesAttributableToConversionOfDebtSecurities
501000
CY2019 us-gaap Incremental Common Shares Attributable To Conversion Of Debt Securities
IncrementalCommonSharesAttributableToConversionOfDebtSecurities
501000
CY2021 imgn Share Based Compensation Arrangement By Share Based Payment Award Number Of Plans
ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans
3
CY2021 us-gaap Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
15839000
CY2020 us-gaap Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
11465000
CY2019 us-gaap Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
13747000
CY2021 us-gaap Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
3322000
CY2020 us-gaap Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
746000
CY2019 us-gaap Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
556000
CY2021 us-gaap Proceeds From Stock Options Exercised
ProceedsFromStockOptionsExercised
3769000
CY2020 us-gaap Proceeds From Stock Options Exercised
ProceedsFromStockOptionsExercised
1471000
CY2019 us-gaap Proceeds From Stock Options Exercised
ProceedsFromStockOptionsExercised
2873000
CY2021 us-gaap Number Of Operating Segments
NumberOfOperatingSegments
1
CY2021Q4 us-gaap Property Plant And Equipment Gross
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CY2020Q4 us-gaap Property Plant And Equipment Gross
PropertyPlantAndEquipmentGross
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CY2021Q4 us-gaap Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
29687000
CY2020Q4 us-gaap Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
27763000
CY2021Q4 us-gaap Property Plant And Equipment Net
PropertyPlantAndEquipmentNet
4663000
CY2020Q4 us-gaap Property Plant And Equipment Net
PropertyPlantAndEquipmentNet
5760000
CY2021 us-gaap Depreciation Depletion And Amortization
DepreciationDepletionAndAmortization
2000000.0
CY2020 us-gaap Depreciation Depletion And Amortization
DepreciationDepletionAndAmortization
2100000
CY2019 us-gaap Depreciation Depletion And Amortization
DepreciationDepletionAndAmortization
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CY2019Q2 us-gaap Impairment Of Long Lived Assets To Be Disposed Of
ImpairmentOfLongLivedAssetsToBeDisposedOf
2500000
CY2019Q4 imgn Cost Basis To Liquidate Property And Equipment
CostBasisToLiquidatePropertyAndEquipment
14200000
CY2019Q4 imgn Accumulated Depreciation Impairment Liquidate Equipment
AccumulatedDepreciationImpairmentLiquidateEquipment
12900000
CY2019Q4 imgn Equipment Liquidate Amount
EquipmentLiquidateAmount
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CY2020 imgn Cost Basis To Liquidate Property And Equipment
CostBasisToLiquidatePropertyAndEquipment
6700000
CY2020 us-gaap Proceeds From Sale Of Property Plant And Equipment
ProceedsFromSaleOfPropertyPlantAndEquipment
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CY2021 us-gaap Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest
IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
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CY2020 us-gaap Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest
IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
-44372000
CY2019 us-gaap Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest
IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
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CY2021 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
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CY2021 us-gaap Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate
IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
-29254000
CY2020 us-gaap Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate
IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
-9318000
CY2019 us-gaap Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate
IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
-21868000
CY2021 us-gaap Income Tax Reconciliation Nondeductible Expense
IncomeTaxReconciliationNondeductibleExpense
606000
CY2020 us-gaap Income Tax Reconciliation Nondeductible Expense
IncomeTaxReconciliationNondeductibleExpense
157000
CY2019 us-gaap Income Tax Reconciliation Nondeductible Expense
IncomeTaxReconciliationNondeductibleExpense
320000
CY2021 us-gaap Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost
IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
420000
CY2019 us-gaap Income Tax Reconciliation Tax Credits Research
IncomeTaxReconciliationTaxCreditsResearch
1652000
CY2021 imgn Income Tax Reconciliation Federal Orphan Drug Credit
IncomeTaxReconciliationFederalOrphanDrugCredit
7429000
CY2020 imgn Income Tax Reconciliation Federal Orphan Drug Credit
IncomeTaxReconciliationFederalOrphanDrugCredit
6218000
CY2019 imgn Income Tax Reconciliation Federal Orphan Drug Credit
IncomeTaxReconciliationFederalOrphanDrugCredit
4426000
CY2021 imgn Income Tax Reconciliation Expired Carryforward
IncomeTaxReconciliationExpiredCarryforward
345000
CY2020 imgn Income Tax Reconciliation Expired Carryforward
IncomeTaxReconciliationExpiredCarryforward
419000
CY2019 imgn Income Tax Reconciliation Expired Carryforward
IncomeTaxReconciliationExpiredCarryforward
500000
CY2021Q4 us-gaap Deferred Tax Assets Tax Credit Carryforwards Research
DeferredTaxAssetsTaxCreditCarryforwardsResearch
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CY2020Q4 us-gaap Deferred Tax Assets Tax Credit Carryforwards Research
DeferredTaxAssetsTaxCreditCarryforwardsResearch
80694000
CY2021 imgn Effective Income Tax Rate Reconciliation Tax Credit Lease Incentive Amount
EffectiveIncomeTaxRateReconciliationTaxCreditLeaseIncentiveAmount
-4789000
CY2021Q4 imgn Deferred Tax Assets Property And Other Intangible Assets
DeferredTaxAssetsPropertyAndOtherIntangibleAssets
1150000
CY2020Q4 imgn Deferred Tax Assets Property And Other Intangible Assets
DeferredTaxAssetsPropertyAndOtherIntangibleAssets
871000
CY2020 us-gaap Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost
IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
201000
CY2019 us-gaap Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost
IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
569000
CY2021 us-gaap Income Tax Reconciliation State And Local Income Taxes
IncomeTaxReconciliationStateAndLocalIncomeTaxes
-7376000
CY2020 us-gaap Income Tax Reconciliation State And Local Income Taxes
IncomeTaxReconciliationStateAndLocalIncomeTaxes
-2250000
CY2019 us-gaap Income Tax Reconciliation State And Local Income Taxes
IncomeTaxReconciliationStateAndLocalIncomeTaxes
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CY2021 us-gaap Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance
IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
46987000
CY2020 us-gaap Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance
IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
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CY2019 us-gaap Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance
IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
27812000
CY2021 us-gaap Income Tax Reconciliation Tax Credits Research
IncomeTaxReconciliationTaxCreditsResearch
575000
CY2020 us-gaap Income Tax Reconciliation Tax Credits Research
IncomeTaxReconciliationTaxCreditsResearch
228000
CY2021 imgn Effective Income Tax Rate Reconciliation Stock Option Expiration Amount
EffectiveIncomeTaxRateReconciliationStockOptionExpirationAmount
1065000
CY2020 imgn Effective Income Tax Rate Reconciliation Stock Option Expiration Amount
EffectiveIncomeTaxRateReconciliationStockOptionExpirationAmount
2062000
CY2019 imgn Effective Income Tax Rate Reconciliation Stock Option Expiration Amount
EffectiveIncomeTaxRateReconciliationStockOptionExpirationAmount
5471000
CY2021 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
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CY2020 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
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CY2019 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
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CY2021Q4 us-gaap Deferred Tax Assets Operating Loss Carryforwards
DeferredTaxAssetsOperatingLossCarryforwards
264773000
CY2020Q4 us-gaap Deferred Tax Assets Operating Loss Carryforwards
DeferredTaxAssetsOperatingLossCarryforwards
220286000
CY2021Q4 us-gaap Deferred Tax Assets Deferred Income
DeferredTaxAssetsDeferredIncome
25153000
CY2020Q4 us-gaap Deferred Tax Assets Deferred Income
DeferredTaxAssetsDeferredIncome
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CY2021Q4 us-gaap Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost
DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
12286000
CY2020Q4 us-gaap Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost
DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
9940000
CY2021Q4 imgn Deferred Tax Assets Operating Lease Liability
DeferredTaxAssetsOperatingLeaseLiability
5170000
CY2020Q4 imgn Deferred Tax Assets Operating Lease Liability
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CY2021Q4 us-gaap Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other
DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
1737000
CY2020Q4 us-gaap Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other
DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
1514000
CY2021Q4 imgn Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Royalty Sale
DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRoyaltySale
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CY2020Q4 imgn Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Royalty Sale
DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRoyaltySale
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CY2021Q4 us-gaap Deferred Tax Assets Gross
DeferredTaxAssetsGross
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CY2020Q4 us-gaap Deferred Tax Assets Gross
DeferredTaxAssetsGross
366875000
CY2021Q4 imgn Deferred Tax Liabilities Share Based Compensation
DeferredTaxLiabilitiesShareBasedCompensation
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CY2020Q4 imgn Deferred Tax Liabilities Share Based Compensation
DeferredTaxLiabilitiesShareBasedCompensation
58000
CY2021Q4 imgn Deferred Tax Liabilities Operating Lease Right Of Use Asset
DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset
3386000
CY2020Q4 imgn Deferred Tax Liabilities Operating Lease Right Of Use Asset
DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset
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CY2021Q4 imgn Deferred Tax Liabilities Royalty Sale
DeferredTaxLiabilitiesRoyaltySale
158000
CY2021Q3 us-gaap Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1
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0.01
CY2021Q4 us-gaap Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1
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0.01
CY2021Q4 us-gaap Shares Issued Price Per Share
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CY2021 us-gaap Lessee Operating Lease Existence Of Option To Extend
LesseeOperatingLeaseExistenceOfOptionToExtend
true
CY2019Q1 imgn Unamortized Lease Incentive And Straight Line Lease Liability Balances
UnamortizedLeaseIncentiveAndStraightLineLeaseLiabilityBalances
9700000
CY2021Q4 us-gaap Operating Lease Weighted Average Discount Rate Percent
OperatingLeaseWeightedAverageDiscountRatePercent
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CY2021 imgn Aggregate Adjustment To Right Of Use Asset
AggregateAdjustmentToRightOfUseAsset
1000000
CY2021 us-gaap Operating Lease Expense
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CY2020Q4 imgn Deferred Tax Liabilities Royalty Sale
DeferredTaxLiabilitiesRoyaltySale
247000
CY2021Q4 us-gaap Deferred Income Tax Liabilities
DeferredIncomeTaxLiabilities
3635000
CY2020Q4 us-gaap Deferred Income Tax Liabilities
DeferredIncomeTaxLiabilities
4149000
CY2021Q4 us-gaap Deferred Tax Assets Valuation Allowance
DeferredTaxAssetsValuationAllowance
409713000
CY2020Q4 us-gaap Deferred Tax Assets Valuation Allowance
DeferredTaxAssetsValuationAllowance
362726000
CY2021 us-gaap Valuation Allowance Deferred Tax Asset Change In Amount
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CY2015 imgn Ownership Control Increase Decrease Under Section382 Percentage
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0
CY2020 us-gaap Tax Adjustments Settlements And Unusual Provisions
TaxAdjustmentsSettlementsAndUnusualProvisions
0
CY2021 us-gaap Tax Adjustments Settlements And Unusual Provisions
TaxAdjustmentsSettlementsAndUnusualProvisions
0
CY2021Q4 us-gaap Common Stock Capital Shares Reserved For Future Issuance
CommonStockCapitalSharesReservedForFutureIssuance
33600000
CY2021 imgn Number Of Real Estate Leases
NumberOfRealEstateLeases
1
CY2020 us-gaap Operating Lease Expense
OperatingLeaseExpense
4000000.0
CY2019 us-gaap Operating Lease Expense
OperatingLeaseExpense
4300000
CY2021 us-gaap Operating Lease Payments
OperatingLeasePayments
5300000
CY2020 us-gaap Operating Lease Payments
OperatingLeasePayments
5500000
CY2021Q4 us-gaap Operating Lease Right Of Use Asset
OperatingLeaseRightOfUseAsset
12400000
CY2021Q4 us-gaap Operating Lease Liability
OperatingLeaseLiability
18800000
CY2021Q4 us-gaap Operating Lease Weighted Average Remaining Lease Term1
OperatingLeaseWeightedAverageRemainingLeaseTerm1
P4Y3M
CY2021Q4 us-gaap Lessee Operating Lease Liability Payments Due Next Twelve Months
LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
5363000
CY2021Q4 us-gaap Lessee Operating Lease Liability Payments Due Year Two
LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
5503000
CY2021Q4 us-gaap Lessee Operating Lease Liability Payments Due Year Three
LesseeOperatingLeaseLiabilityPaymentsDueYearThree
5522000
CY2021Q4 us-gaap Lessee Operating Lease Liability Payments Due Year Four
LesseeOperatingLeaseLiabilityPaymentsDueYearFour
5543000
CY2021Q4 us-gaap Lessee Operating Lease Liability Payments Due Year Five
LesseeOperatingLeaseLiabilityPaymentsDueYearFive
1429000
CY2021Q4 us-gaap Lessee Operating Lease Liability Payments Due After Year Five
LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
13000
CY2021Q4 us-gaap Lessee Operating Lease Liability Payments Due
LesseeOperatingLeaseLiabilityPaymentsDue
23373000
CY2021Q4 us-gaap Lessee Operating Lease Liability Undiscounted Excess Amount
LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
4592000
CY2021Q4 us-gaap Operating Lease Liability
OperatingLeaseLiability
18781000
CY2021 us-gaap Variable Lease Cost
VariableLeaseCost
3400000
CY2021 us-gaap Sublease Income
SubleaseIncome
4900000
CY2020 us-gaap Sublease Income
SubleaseIncome
2800000
CY2021 imgn Defined Contribution Plan Employee Contribution Limit Percentage Of Salary
DefinedContributionPlanEmployeeContributionLimitPercentageOfSalary
1
CY2021 us-gaap Defined Contribution Plan Employer Matching Contribution Percent
DefinedContributionPlanEmployerMatchingContributionPercent
0.50
CY2021 us-gaap Defined Contribution Plan Maximum Annual Contributions Per Employee Percent
DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
0.06
CY2021 us-gaap Defined Contribution Plan Cost Recognized
DefinedContributionPlanCostRecognized
500000
CY2020 us-gaap Defined Contribution Plan Cost Recognized
DefinedContributionPlanCostRecognized
400000
CY2019 us-gaap Defined Contribution Plan Cost Recognized
DefinedContributionPlanCostRecognized
800000

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