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Income Taxes
 6 Months Ended
Jun. 30, 2025
Income Taxes [Abstract]  
Income Taxes
Note 3 — Income Taxes
 
For the three months ended June 30, 2025 and 2024, we recognized income tax expense of $0 and $3, on pretax losses of $3,621 and $3,827. For the six months ended June 30, 2025 and 2024, we recognized income tax expense of $2 and $3, on pretax losses of $7,298, and $8,118.  Our effective tax rate is approximately 0% for all periods. Our effective tax rate differed from the federal statutory rate of 21%, primarily due to the valuation allowance placed against our net deferred tax assets. We have a full valuation allowance on all federal and state deferred tax assets as of June 30, 2025.
 
Our tax years for 2007 and forward are subject to examination by the U.S. tax authority and our tax years for 2021 and forward are open for various state tax authorities because we utilized the net operating loss and tax credits generated in those years in 2020. The California Franchise Tax Board completed and closed their audit on our 2019, 2020 and 2021 California tax years and found no change in our tax liability.  As of June 30, 2025, we have not identified or accrued amounts for uncertain tax positions or interest and penalties related to uncertain tax positions and do not expect significant changes to the estimate in the coming twelve months.