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Income Taxes (Details 1) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Stock issued for services | $ 1,730 | $ 1,861
Accrued compensation | 164 | 119
Stock issued for acquisition of program | 1,202 | 1,576
Stock issued for license agreement | 1,947 | 3,147
Stock issued for milestone payment | 301 | 478
Amortizable license fee | 6 | 9
Net operating loss carry-forward | 40,248 | 50,517
Total gross deferred tax assets | 45,598 | 57,707
Less: valuation allowance | (45,598) | (57,707)
Total net deferred tax assets | $ 0 | $ 0

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