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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flows from Operating Activities:      
Net loss $ (18,728,734)us-gaap_NetIncomeLoss $ (12,322,012)us-gaap_NetIncomeLoss $ (16,416,907)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 155,083us-gaap_DepreciationAndAmortization 141,522us-gaap_DepreciationAndAmortization 126,537us-gaap_DepreciationAndAmortization
Stock-based compensation expense 3,059,989us-gaap_ShareBasedCompensation 3,002,241us-gaap_ShareBasedCompensation 3,623,911us-gaap_ShareBasedCompensation
Issuance of common stock to licensees     964,000cris_IssuanceOfCommonStockToLicensees
Change in fair value of warrant liability (716,786)us-gaap_FairValueAdjustmentOfWarrants (771,393)us-gaap_FairValueAdjustmentOfWarrants (2,257,130)us-gaap_FairValueAdjustmentOfWarrants
Amortization of debt issuance costs 89,120us-gaap_AmortizationOfFinancingCosts 104,842us-gaap_AmortizationOfFinancingCosts 5,769us-gaap_AmortizationOfFinancingCosts
Non-cash interest (income)/expense 169,652us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments 95,197us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments (434,763)us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Non-cash interest on debt (713,968)us-gaap_PaidInKindInterest 713,968us-gaap_PaidInKindInterest  
Gain on sale of fixed assets (1,750)us-gaap_GainLossOnDispositionOfAssets    
Changes in operating assets and liabilities:      
Accounts receivable (483,807)us-gaap_IncreaseDecreaseInAccountsReceivable (569,124)us-gaap_IncreaseDecreaseInAccountsReceivable (865,997)us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses and other assets (2,409)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (116,639)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 40,959us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued and other liabilities 360,866us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 181,821us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 20,316us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Total adjustments 1,915,990us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 2,782,435us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 1,223,602us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash used in operating activities (16,812,744)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (9,539,577)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (15,193,305)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows from Investing Activities:      
Purchases of investments (41,399,246)us-gaap_PaymentsToAcquireMarketableSecurities (65,827,658)us-gaap_PaymentsToAcquireMarketableSecurities (69,153,956)us-gaap_PaymentsToAcquireMarketableSecurities
Sales/maturities of investments 57,748,851us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 52,349,212us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 46,214,044us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Decrease in restricted cash/investments 13,877us-gaap_IncreaseDecreaseInRestrictedCash 13,918us-gaap_IncreaseDecreaseInRestrictedCash 41,632us-gaap_IncreaseDecreaseInRestrictedCash
Expenditures for property and equipment (92,209)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (153,009)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (104,975)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of fixed assets 1,750us-gaap_ProceedsFromSaleOfProductiveAssets    
Net cash provided by/(used in) investing activities 16,273,023us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (13,617,537)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (23,003,255)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Flows from Financing Activities:      
Proceeds from issuance of common stock associated with offerings, net of issuance costs (see Note 9)   16,245,984cris_ProceedsFromIssuanceOfCommonStockNetOfIssuanceCosts 879,080cris_ProceedsFromIssuanceOfCommonStockNetOfIssuanceCosts
Proceeds from issuance of common stock under the Company's share-based compensation plans and warrant exercises 282,799us-gaap_ProceedsFromIssuanceOfCommonStock 4,016,383us-gaap_ProceedsFromIssuanceOfCommonStock 5,105,699us-gaap_ProceedsFromIssuanceOfCommonStock
Payment of debt issuance costs   (261,475)us-gaap_PaymentsOfDebtIssuanceCosts (160,240)us-gaap_PaymentsOfDebtIssuanceCosts
(Payments)/proceeds from Curis Royalty's debt (1,587,154)us-gaap_ProceedsFromRepaymentsOfDebt   30,000,000us-gaap_ProceedsFromRepaymentsOfDebt
Net cash (used by)/provided by financing activities (1,304,355)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 20,000,892us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 35,824,539us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net decrease in cash and cash equivalents (1,844,076)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (3,156,222)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (2,372,021)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 9,591,487us-gaap_CashAndCashEquivalentsAtCarryingValue 12,747,709us-gaap_CashAndCashEquivalentsAtCarryingValue 15,119,730us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 7,747,411us-gaap_CashAndCashEquivalentsAtCarryingValue 9,591,487us-gaap_CashAndCashEquivalentsAtCarryingValue 12,747,709us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental cash flow data:      
Cash paid for interest 4,386,109us-gaap_InterestPaid 2,913,999us-gaap_InterestPaid  
Non-cash items:      
Treasury stock   632,755cris_TreasuryStockNonCash  
Receivable for issuances of common stock     14,366cris_ReceivableForIssuancesOfCommonStock
Unpaid debt issuance costs     $ 261,475cris_DebtIssuanceCostsUnpaidAndAccrued