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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

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