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Legal Proceedings, Commitments and Contingencies (Schedule of Litigation Settlements) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Loss Contingencies [Line Items]            
Total settlements   $ (1,800) $ 0 $ (1,800) $ 0 $ 26,800
Payable by the insurance carriers       21,700    
Galena Biopharma, Inc. Securities Litigation, Civil Action No. 3:14-cv-00367-SI [Member]            
Loss Contingencies [Line Items]            
Total settlements       (20,000)    
Galena Biopharma, Inc. Derivative Litigation, Civil Action No. 3:14-cv-00382-SI [Member]            
Loss Contingencies [Line Items]            
Total settlements       (5,000)    
Shareholders Securities Litigation [Member]            
Loss Contingencies [Line Items]            
Total settlements       $ (1,800)    
Scenario, Forecast [Member]            
Loss Contingencies [Line Items]            
Payable by the company in cash (paid in July 2016) $ 2,450          
Payable by the company in common stock (paid in July 2016) $ 2,650