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Income Taxes - Components of Deferred Income Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets:    
Accumulated net operating losses (tax effected) $ 68,286 $ 70,747
CIRM funding 0 336
Right of use liability 176 205
Share-based compensation 5,025 3,584
Intangibles 131 141
Accumulated depreciation 19 9
Accrued payroll 167 121
Other 526 737
Deferred tax assets 74,330 75,880
Deferred Tax Liabilities:    
Right of use asset (161) (190)
Deferred tax liabilities (161) (190)
Net deferred tax assets and liabilities 74,169 75,690
Valuation allowance (74,169) (75,690)
Net deferred tax asset $ 0 $ 0