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Income Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Federal net operating loss carryforward | $ 36,803 | $ 25,306
Intellectual property | 58,504 | 61,787
Accrued interest | 1,262 | 129
Patent amortization | 4 | 5
Deferred tax assets before valuation | 96,573 | 87,227
Valuation allowance | (96,573) | (87,227)
Net deferred income tax assets | $ 0 | $ 0

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