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Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Stock issued for services | $ 1,428 | $ 1,223
Accrued compensation | 42 | 20
Stock issued for acquisition of program | 1,436 | 1,301
Stock issued for license agreement | 1,574 | 1,574
Stock issued for milestone payment | 262 | 255
Amortizable license fee | 5 | 5
Net operating loss carry-forward | 12,540 | 8,494
Total gross deferred tax assets | 17,287 | 12,872
Less: valuation allowance | (17,287) | (12,872)
Total net deferred tax assets | $ 0 | $ 0

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