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Equity Transactions (Details) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended
Oct. 15, 2013
Oct. 23, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 15, 2014
Feb. 05, 2014
Subsequent Event [Line Items]              
Stock issued, underwritten public offering, value $ 25,900,000us-gaap_StockIssuedDuringPeriodValueNewIssues $ 23,000,000us-gaap_StockIssuedDuringPeriodValueNewIssues $ 80,535,401us-gaap_StockIssuedDuringPeriodValueNewIssues $ 24,094,530us-gaap_StockIssuedDuringPeriodValueNewIssues $ 21,476,815us-gaap_StockIssuedDuringPeriodValueNewIssues    
Stock issued, underwritten public offering, value (in shares) 11,500,000us-gaap_StockIssuedDuringPeriodSharesNewIssues 9,200,000us-gaap_StockIssuedDuringPeriodSharesNewIssues          
Reverse stock split conversation ratio     1-for-7        
Common stock per share value (in dollars per share) $ 2.25us-gaap_SharePrice $ 2.50us-gaap_SharePrice          
Net proceeds from issuance of common stock 24,100,000us-gaap_ProceedsFromIssuanceOfCommonStock 21,500,000us-gaap_ProceedsFromIssuanceOfCommonStock          
Common stock shares outstanding (in shares)     55,921,986us-gaap_CommonStockSharesOutstanding 42,116,964us-gaap_CommonStockSharesOutstanding      
KTB Tumorforschungs GmbH [Member]              
Subsequent Event [Line Items]              
Stock issued (in shares)           200,000us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets
/ us-gaap_StatementScenarioAxis
= cytr_KTBTumorforschungsGmbHMember		  
Fair value of shares issued           800,000us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets
/ us-gaap_StatementScenarioAxis
= cytr_KTBTumorforschungsGmbHMember		  
Subsequent Event [Member]              
Subsequent Event [Line Items]              
Stock issued, underwritten public offering, value             86,000,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Stock issued, underwritten public offering, value (in shares)             13,200,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Common stock per share value (in dollars per share)             $ 6.50us-gaap_SharePrice
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Net proceeds from issuance of common stock             $ 80,500,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Common stock shares outstanding (in shares)             55,300,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember