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Income Taxes - Significant Components of Company's Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
US federal statutory rate $ (9,628) $ (9,540)
State and local taxes net of federal income tax effect [1] (408) 1
Research and development credits (591) (642)
Change in valuation allowance 8,615 8,816
Officers' compensation 348 588
Stock based compensation 432 488
Other 5 5
Other adjustments 400 284
Change in unrecognized tax benefits 827 0
Total income tax (benefit) expense $ 0 $ 0
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
US federal statutory rate 21.00% 21.00%
State and local taxes net of federal income tax effect [1] 0.90% 0.00%
Research and development credits 1.30% 1.40%
Change in valuation allowance (18.80%) (19.40%)
Officers' compensation (0.70%) (1.30%)
Stock based compensation (1.00%) (1.10%)
Other 0.00% 0.00%
Other adjustments (0.90%) (0.60%)
Effective Income Tax Rate Reconciliation Change in Unrecognized Tax Benefits (1.80%) 0.00%
Effective income tax rate 0.00% 0.00%
[1] Income tax rate associated with the state of California.