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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net loss $ (33,222)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (49,626)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 2,891us-gaap_DepreciationDepletionAndAmortization 3,179us-gaap_DepreciationDepletionAndAmortization
Share-based compensation expense 5,426us-gaap_ShareBasedCompensation 6,074us-gaap_ShareBasedCompensation
Accretion of discount/ premium on investment securities 161us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments 136us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Non-cash interest expense 370us-gaap_AmortizationOfFinancingCostsAndDiscounts 386us-gaap_AmortizationOfFinancingCostsAndDiscounts
Changes in assets and liabilities:    
Accounts receivable and related party accounts receivable (8,010)us-gaap_IncreaseDecreaseInReceivables (7,124)us-gaap_IncreaseDecreaseInReceivables
Prepaid expenses and other current assets 483us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 938us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Inventory 4us-gaap_IncreaseDecreaseInInventories (1,264)us-gaap_IncreaseDecreaseInInventories
Other assets (222)us-gaap_IncreaseDecreaseInOtherOperatingAssets (5)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable, related party accounts payable and accrued expenses (6,990)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (8,042)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Accrued research and development costs 5,696irwd_IncreaseDecreaseInAccruedResearchAndDevelopmentExpense (1,649)irwd_IncreaseDecreaseInAccruedResearchAndDevelopmentExpense
Deferred revenue (1,798)us-gaap_IncreaseDecreaseInDeferredRevenue (215)us-gaap_IncreaseDecreaseInDeferredRevenue
Deferred rent (573)irwd_IncreaseDecreaseInDeferredRentPayables (682)irwd_IncreaseDecreaseInDeferredRentPayables
Net cash used in operating activities (35,784)us-gaap_NetCashProvidedByUsedInOperatingActivities (57,894)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Purchases of available-for-sale securities (72,281)us-gaap_PaymentsToAcquireAvailableForSaleSecurities (79,696)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Sales and maturities of available-for-sale securities 94,006us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 74,518us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Purchases of property and equipment (1,987)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,294)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of property and equipment 23us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment  
Net cash provided by (used in) investing activities 19,761us-gaap_NetCashProvidedByUsedInInvestingActivities (6,472)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Proceeds from issuance of common stock   190,428us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from exercise of stock options issued employee stock purchase plan 7,946us-gaap_ProceedsFromStockOptionsExercised 3,852us-gaap_ProceedsFromStockOptionsExercised
Payments on capital lease obligations (278)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations (275)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations
Principal payments on debt (2,250)us-gaap_RepaymentsOfDebt  
Net cash provided by financing activities 5,418us-gaap_NetCashProvidedByUsedInFinancingActivities 194,005us-gaap_NetCashProvidedByUsedInFinancingActivities
Net (decrease) increase in cash and cash equivalents (10,605)us-gaap_NetCashProvidedByUsedInContinuingOperations 129,639us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents, beginning of period 74,297us-gaap_CashAndCashEquivalentsAtCarryingValue 75,490us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period $ 63,692us-gaap_CashAndCashEquivalentsAtCarryingValue $ 205,129us-gaap_CashAndCashEquivalentsAtCarryingValue