Subsequent Events	6 Months Ended
Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	13. Subsequent Events On July 27, 2017, we entered into a global strategic license agreement (the "License Agreement") with NantCell, Inc. ("NantCell"), for providing NantCell the exclusive rights to develop and commercialize aldoxorubicin for all indications. Under the terms of the License Agreement, CytRx is entitled to receive up to $343 million in milestone payments related to regulatory approvals and commercial milestones for aldoxorubicin. In addition, CytRx will receive certain specified royalties for all other indications (our receipt of which would obligate us to make certain payments to KTB). NantCell will be responsible for all future development, manufacturing and commercialization expenses, other than royalties and milestones that may be owed by CytRx under its existing license agreements. In connection with the License Agreement, on July 27, 2017, CytRx (i) entered into a stock purchase agreement with NantCell in which NantCell purchased $13 million of CytRx common stock at $1.10 per share, a 92% premium to market on that date, and (ii) issued to NantCell a warrant to purchase up to 3 million shares of common stock at $1.10, expiring on January 27, 2019. On July 27, 2017, we entered into a First Amendment to Loan and Security Agreement with Hercules to amend our existing long-term loan facility (the "Loan Agreement") originally entered into on February 5, 2016. The amendment provides for our payment, on July 28, 2017, of $5.0 million in outstanding principal and unpaid interest due under the Loan Agreement, plus a $100,000 prepayment charge, and for our repayment, on or prior to September 30, 2017, of an additional $5.0 million outstanding principal and unpaid interest due under the Loan Agreement, plus an additional prepayment charge. We made the first $5 million payment on July 28, 2017. In connection with the Loan Agreement, in February 2016 we issued the lenders warrants to purchase an aggregate of up to approximately 630,000 shares of our common stock at an exercise price of $2.05 per share. Pursuant to the amendment, a portion of the warrants (representing 80% of the total number of shares issuable upon exercise of the warrants) was amended to change the exercise price of that portion of the warrants from $2.05 per share to a reduced amount, to be calculated based upon the 30-day volume-weighted average price of our common stock over the 30-day period beginning 15 days before the July 28, 2017 announcement of the NantCell license transaction.

13. Subsequent Events

On July 27, 2017, we entered into a global strategic license agreement (the "License Agreement") with NantCell, Inc. ("NantCell"), for providing NantCell the exclusive rights to develop and commercialize aldoxorubicin for all indications. Under the terms of the License Agreement, CytRx is entitled to receive up to $343 million in milestone payments related to regulatory approvals and commercial milestones for aldoxorubicin. In addition, CytRx will receive certain specified royalties for all other indications (our receipt of which would obligate us to make certain payments to KTB). NantCell will be responsible for all future development, manufacturing and commercialization expenses, other than royalties and milestones that may be owed by CytRx under its existing license agreements.

In connection with the License Agreement, on July 27, 2017, CytRx (i) entered into a stock purchase agreement with NantCell in which NantCell purchased $13 million of CytRx common stock at $1.10 per share, a 92% premium to market on that date, and (ii) issued to NantCell a warrant to purchase up to 3 million shares of common stock at $1.10, expiring on January 27, 2019.

On July 27, 2017, we entered into a First Amendment to Loan and Security Agreement with Hercules to amend our existing long-term loan facility (the "Loan Agreement") originally entered into on February 5, 2016. The amendment provides for our payment, on July 28, 2017, of $5.0 million in outstanding principal and unpaid interest due under the Loan Agreement, plus a $100,000 prepayment charge, and for our repayment, on or prior to September 30, 2017, of an additional $5.0 million outstanding principal and unpaid interest due under the Loan Agreement, plus an additional prepayment charge. We made the first $5 million payment on July 28, 2017. In connection with the Loan Agreement, in February 2016 we issued the lenders warrants to purchase an aggregate of up to approximately 630,000 shares of our common stock at an exercise price of $2.05 per share. Pursuant to the amendment, a portion of the warrants (representing 80% of the total number of shares issuable upon exercise of the warrants) was amended to change the exercise price of that portion of the warrants from $2.05 per share to a reduced amount, to be calculated based upon the 30-day volume-weighted average price of our common stock over the 30-day period beginning 15 days before the July 28, 2017 announcement of the NantCell license transaction.