Legal Proceedings, Commitments and Contingencies (Schedule of Litigation Settlements) (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Jun. 30, 2016	Apr. 30, 2016	Mar. 31, 2016
Loss Contingencies [Line Items]
Total settlements			$ 25,000
Payable by the insurance carriers			20,000
Galena Biopharma, Inc. Securities Litigation, Civil Action No. 3:14-cv-00367-SI [Member]
Loss Contingencies [Line Items]
Total settlements			20,000
Payable by the insurance carriers			20,000
Galena Biopharma, Inc. Derivative Litigation, Civil Action No. 3:14-cv-00382-SI [Member]
Loss Contingencies [Line Items]
Total settlements			$ 5,000
Scenario, Forecast [Member]
Loss Contingencies [Line Items]
Payable by the company in cash	$ 2,300
Payable by the company in common stock	1,000
Scenario, Forecast [Member] | Galena Biopharma, Inc. Securities Litigation, Civil Action No. 3:14-cv-00367-SI [Member]
Loss Contingencies [Line Items]
Payable by the company in cash	2,300
Payable by the company in common stock	$ 1,000
Subsequent Event [Member]
Loss Contingencies [Line Items]
Payable by the insurance carriers		$ 1,700
Subsequent Event [Member] | Galena Biopharma, Inc. Securities Litigation, Civil Action No. 3:14-cv-00367-SI [Member]
Loss Contingencies [Line Items]
Payable by the insurance carriers		$ 1,700