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Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Stock issued for services | $ 1,504 | $ 1,428
Accrued compensation | 27 | 42
Stock issued for acquisition of program | 1,462 | 1,436
Stock issued for license agreement | 1,363 | 1,574
Stock issued for milestone payment | 236 | 262
Amortizable license fee | 4 | 5
Net operating loss carry-forward | 16,884 | 12,540
Total gross deferred tax assets | 21,480 | 17,287
Less: valuation allowance | (21,480) | (17,287)
Total net deferred tax assets | $ 0 | $ 0

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