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Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Stock issued for services | $ 1,223 | $ 1,998
Accrued compensation | 20 | 38
Stock issued for acquisition of program | 1,301 | 1,224
Stock issued for license agreement | 1,574 | 1,760
Stock issued for milestone payment | 255 | 278
Amortizable license fee | 5 | 5
Net operating loss carry-forward | 48,532 | 44,512
Total gross deferred tax assets | 52,910 | 49,815
Less: valuation allowance | (52,910) | (49,815)
Total net deferred tax assets | $ 0 | $ 0

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