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Income Taxes - Components of Deferred Income Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred Tax Assets: |  |
Accumulated net operating losses (tax effected) | $ 70,747 | $ 60,544
CIRM funding | 336 | 1,033
Right of use liability | 205 | 5
Share-based compensation | 3,584 | 6,390
Intangibles | 141 | 199
Charitable contributions | 0 | 9
Accumulated depreciation | 9 | 9
Accrued payroll | 121 | 117
Other | 737 | 525
Deferred tax assets | 75,880 | 68,831
Deferred Tax Liabilities: |  |
Right of use asset | 190 | 0
Deferred tax liabilities | 190 | 0
Net deferred tax asset, before valuation allowance | 75,690 | 68,831
Valuation allowance | (75,690) | (68,831)
Net deferred tax asset | $ 0 | $ 0

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