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Acquisition - Total Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 29, 2017
Assets acquired:      
Intangible assets $ 8,500 $ 17,600  
Goodwill $ 1,914 $ 1,914  
Galena Biopharma, Inc      
Assets acquired:      
Cash     $ 1,812
Restricted cash     10,346
Prepaid expenses and other assets     3,103
Intangible assets     17,600
Goodwill     1,914
Total assets acquired     34,775
Liabilities assumed:      
Accounts payable and accrued expenses     5,692
Litigation settlement     1,300
Long-term debt     10,988
Contingent purchase price consideration of Apthera, Inc.     1,294
Warrant liability     1,309
Deferred tax liability     1,673
Total liabilities assumed     22,256
Net assets acquired     $ 12,519