Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, unrestricted	$ 191.9
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, unrestricted	$ 112.4

This line item represents the amount of operating loss carryforwards available to reduce future taxable income, on which there are no limitations on its use.

No definition available.

Name:	cytr_OperatingLossCarryforwardsUnrestricted
Namespace Prefix:	cytr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration