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Legal Proceedings, Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Aug. 08, 2017
USD ($)
Jul. 24, 2017
USD ($)
Apr. 10, 2017
USD ($)
Dec. 22, 2016
USD ($)
Jun. 24, 2016
USD ($)
Jun. 06, 2016
USD ($)
shares
Jul. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Jun. 30, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Defendant
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Feb. 23, 2017
Counts
Witness
Loss Contingencies [Line Items]                          
Total number of shares cancelled | shares                 161,000 240,000      
Damages paid by insurance companies                   $ 21,700      
Payable by the company in cash                   2,450      
Litigation settlement payable in common stock                   2,650 $ 1,000 $ 0  
Litigation settlement, amount                   27,750      
Asset Purchase Agreement                          
Loss Contingencies [Line Items]                          
Loss contingency, estimate of possible loss                 $ 1,500        
Galena Biopharma, Inc. Derivative Litigation, Civil Action No. 3:14-cv-00382-SI                          
Loss Contingencies [Line Items]                          
Litigation settlement, amount                   5,000      
Galena Biopharma, Inc. Securities Litigation, Civil Action No. 3:14-cv-00367-SI                          
Loss Contingencies [Line Items]                          
Litigation settlement, amount                   20,000      
SEC Litigation                          
Loss Contingencies [Line Items]                          
Litigation settlement, amount                   950      
SEC Litigation | Indemnification Agreement [Member]                          
Loss Contingencies [Line Items]                          
Guarantor obligations     $ 750 $ 750           $ 750      
SEC Litigation | Subsequent Event                          
Loss Contingencies [Line Items]                          
Payable by the company in cash $ 100                        
Litigation settlement with issuance of common stock $ 200                        
Settled Litigation | Galena Biopharma, Inc. Derivative Litigation, Civil Action No. 3:14-cv-00382-SI                          
Loss Contingencies [Line Items]                          
Legal fees         $ 4,500                
Settled Litigation | Galena Biopharma, Inc. Securities Litigation, Civil Action No. 3:14-cv-00367-SI                          
Loss Contingencies [Line Items]                          
Legal fees         4,500                
Settlement payment         $ 20,000 $ 20,000              
Damages paid by insurance companies           16,700              
Damages paid           3,300              
Payable by the company in cash           2,300              
Litigation settlement payable in common stock           $ 1,000              
Litigation settlement, issuance of shares, shares | shares           24,002              
Attorney fees               $ 2,000          
Settled Litigation | Securities Litigation, Opt Out Settlement, Case 1 [Member]                          
Loss Contingencies [Line Items]                          
Litigation settlement, issuance of shares, shares | shares             14,563            
Litigation settlement, amount             $ (150)            
Litigation settlement with issuance of common stock             $ 150            
Settled Litigation | Securities Litigation, Opt Out Settlement, Case 2 [Member]                          
Loss Contingencies [Line Items]                          
Litigation settlement, issuance of shares, shares | shares             168,337            
Litigation settlement with issuance of common stock             $ 1,500            
Settled Litigation | USAO NJ and DOJ                          
Loss Contingencies [Line Items]                          
Litigation settlement, amount                 7,500        
Settled Litigation | Director [Member] | Galena Biopharma, Inc. Derivative Litigation, Civil Action No. 3:14-cv-00382-SI                          
Loss Contingencies [Line Items]                          
Total number of shares cancelled | shares                   60,000      
Settled Litigation | Maximum | Galena Biopharma, Inc. Derivative Litigation, Civil Action No. 3:14-cv-00382-SI                          
Loss Contingencies [Line Items]                          
Settlement payment                   $ 15,000      
Judicial Ruling [Member] | SDAL Criminal Case for Alleged Violations of the False Claims Act and Other Federal Statutes [Member]                          
Loss Contingencies [Line Items]                          
Number of defendants | Defendant                   2      
Judicial Ruling [Member] | SDAL Criminal Case for Alleged Violations of the False Claims Act and Other Federal Statutes [Member] | Subsequent Event                          
Loss Contingencies [Line Items]                          
Number of counts against defendants with judicial ruling of guilty | Counts                         19
Number of counts against defendants | Counts                         20
Judicial Ruling [Member] | Former Employee [Member] | SDAL Criminal Case for Alleged Violations of the False Claims Act and Other Federal Statutes [Member] | Subsequent Event                          
Loss Contingencies [Line Items]                          
Number of witness to testify at trial | Witness                         1
Pending Litigation | SEC Litigation                          
Loss Contingencies [Line Items]                          
Litigation settlement, amount     (200) (200)                  
Pending Litigation | Patel vs Galena biopharma, Inc | Subsequent Event                          
Loss Contingencies [Line Items]                          
Payable by the company in cash   $ 50                      
Litigation settlement, amount   1,300                      
Litigation settlement with issuance of common stock   $ 1,250                      
Pending Litigation | Former CEO [Member] | SEC Litigation                          
Loss Contingencies [Line Items]                          
Litigation settlement, amount     $ (600) $ (600)                  
Commercial Business Segment | Settled Litigation | USAO NJ and DOJ                          
Loss Contingencies [Line Items]                          
Loss contingency accrual                 $ 7,500