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STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net loss $ (30,117,980)us-gaap_NetIncomeLoss $ (47,485,437)us-gaap_NetIncomeLoss $ (17,963,873)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 182,927us-gaap_DepreciationDepletionAndAmortization 120,399us-gaap_DepreciationDepletionAndAmortization 113,936us-gaap_DepreciationDepletionAndAmortization
Loss on retirement of equipment and furnishings 1,220us-gaap_GainLossOnDispositionOfAssets 2,595us-gaap_GainLossOnDispositionOfAssets 42,267us-gaap_GainLossOnDispositionOfAssets
(Gain) loss on warrant liability (19,051,239)us-gaap_DerivativeGainLossOnDerivativeNet 20,210,094us-gaap_DerivativeGainLossOnDerivativeNet (2,766,704)us-gaap_DerivativeGainLossOnDerivativeNet
Unrealized foreign exchange gain (125,659)us-gaap_ForeignCurrencyTransactionGainLossUnrealized (118,438)us-gaap_ForeignCurrencyTransactionGainLossUnrealized 0us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Stock-based compensation expense 6,596,248us-gaap_ShareBasedCompensation 3,985,106us-gaap_ShareBasedCompensation 2,391,529us-gaap_ShareBasedCompensation
Changes in assets and liabilities:      
Receivable (1,901,766)us-gaap_IncreaseDecreaseInAccountsReceivable (835)us-gaap_IncreaseDecreaseInAccountsReceivable 65,902us-gaap_IncreaseDecreaseInAccountsReceivable
Interest receivable (96,163)us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet 18,053us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet 14,758us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet
Prepaid expenses and other current assets (2,126,771)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,132,428)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (173,245)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable 2,779,409us-gaap_IncreaseDecreaseInAccountsPayable 789,655us-gaap_IncreaseDecreaseInAccountsPayable 984,547us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses and other current liabilities 3,303,967us-gaap_IncreaseDecreaseInAccruedLiabilities (139,747)us-gaap_IncreaseDecreaseInAccruedLiabilities (1,753,767)us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash used in operating activities (40,555,807)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (23,750,983)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (19,044,650)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Proceeds from matured short-term investments 38,584,980us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 24,000,000us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 23,125,442us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Purchase of short-term investments (57,121,593)us-gaap_PaymentsToAcquireInvestments (27,084,980)us-gaap_PaymentsToAcquireInvestments (29,067,770)us-gaap_PaymentsToAcquireInvestments
Purchases of equipment and furnishings (956,286)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (41,809)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (141,639)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash (used in) investing activities (19,492,899)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (3,126,789)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (6,083,967)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Proceeds from common stock issued in public offering, net of fees 80,535,401us-gaap_ProceedsFromIssuanceInitialPublicOffering 24,094,530us-gaap_ProceedsFromIssuanceInitialPublicOffering 21,476,815us-gaap_ProceedsFromIssuanceInitialPublicOffering
Proceeds from issuance of restricted stock to employee 100us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans 0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans 100us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans
Repurchase of Company's own stock for treasury (182,943)us-gaap_PaymentsForRepurchaseOfCommonStock (117,070)us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock
Net proceeds from exercise of stock options and warrants 431,941us-gaap_ProceedsFromWarrantExercises 39,336us-gaap_ProceedsFromWarrantExercises 7,200us-gaap_ProceedsFromWarrantExercises
Net cash provided by financing activities 80,784,499us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 24,016,796us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 21,484,115us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents 20,735,793us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (2,860,976)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (3,644,502)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 11,483,112us-gaap_CashAndCashEquivalentsAtCarryingValue 14,344,088us-gaap_CashAndCashEquivalentsAtCarryingValue 17,988,590us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 32,218,905us-gaap_CashAndCashEquivalentsAtCarryingValue 11,483,112us-gaap_CashAndCashEquivalentsAtCarryingValue 14,344,088us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of non-cash financing activities:      
Cashless warrant exercises 133cytr_CashlessWarrantExercises 0cytr_CashlessWarrantExercises 0cytr_CashlessWarrantExercises
Repurchase of Company's own stock for treasury 12,671cytr_RepurchaseOfCommonStockPortionNotDisbursed 27,829cytr_RepurchaseOfCommonStockPortionNotDisbursed 0cytr_RepurchaseOfCommonStockPortionNotDisbursed
Equipment and furnishings purchased but not paid 23,282us-gaap_CapitalExpendituresIncurredButNotYetPaid 3,360us-gaap_CapitalExpendituresIncurredButNotYetPaid 1,506us-gaap_CapitalExpendituresIncurredButNotYetPaid
Supplemental disclosure of Cash Flow Information:      
Cash paid during the year for income taxes $ 800us-gaap_IncomeTaxesPaid $ 800us-gaap_IncomeTaxesPaid $ 0us-gaap_IncomeTaxesPaid