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Income Taxes (Details 1) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Stock issued for services | $ 1,998 | $ 1,730
Accrued compensation | 38 | 164
Stock issued for acquisition of program | 1,224 | 1,202
Stock issued for license agreement | 1,760 | 1,947
Stock issued for milestone payment | 278 | 301
Amortizable license fee | 5 | 6
Net operating loss carry-forward | 44,512 | 40,248
Total gross deferred tax assets | 49,815 | 45,598
Less: valuation allowance | (49,815) | (45,598)
Total net deferred tax assets | $ 0 | $ 0

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