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Taxes - Components of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Components of Company's Deferred Tax Assets    
Net operating loss and tax credit carryforwards $ 59,417 $ 57,074
Depreciation, amortization and impairment of property and equipment 39 39
Stock options 250 210
Right of use asset (1) (26)
Lease liability 1 26
Other 114  
Total deferred tax assets 59,820 57,323
Valuation allowance for deferred tax assets $ (59,820) $ (57,323)