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Income Taxes | 3 Months Ended
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Mar. 31, 2026
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes Our income tax expense for the three months ended March 31, 2026 and 2025 differs from the amount computed by applying the statutory federal income tax rate to income before income taxes. The sources and tax effects of the differences are as follows:
| Three Months Ended March 31,
| 2026 |  | 2025
U.S. federal statutory tax rate | 21.0 | % |  | 21.0 | %
State income taxes, net of federal tax benefit | 1.0 |  |  | 3.4 |
Foreign tax rate differential | — |  |  | (0.2) |
General business credits | (2.0) |  |  | (1.1) |
IRC 162(m) limitation | (0.1) |  |  | (2.9) |
Stock-based compensation | 0.2 |  |  | 3.8 |
Bank-owned life insurance income | (2.0) |  |  | (1.0) |
Nondeductible expenses | 0.2 |  |  | 0.3 |
Nondeductible transaction related costs | 0.1 |  |  | — |
Change in valuation allowance | 2.1 |  |  | — |
Other | — |  |  | 0.1 |
Effective tax rate | 20.5 | % |  | 23.4 | %
For the three months ended March 31, 2025, we utilized the discrete effective tax rate method, treating the year-to-date period as if it was the annual period to calculate our interim income tax provision, as allowed by Accounting Standards Codification 740-270-30-18, "Income Taxes – Interim Reporting." We determined we could not use the estimated annual effective tax rate method as we could not calculate a reliable estimate of the annual effective tax rate due to it being highly sensitive to minor changes in our forecasted amounts, thus generating significant variability in the estimated annual effective tax rate and distorting the customary relationship between income tax expense and pre-tax income in interim periods. The effective tax rate for the three months ended March 31, 2026 and 2025 differs from the statutory federal income tax rate of 21%, primarily due to state income taxes, net of federal tax benefits, general business credits, stock-based compensation, cash surrender value growth in bank owned life insurance policies, the Internal Revenue Code (the "IRC") 162(m) limitation on the deductibility of executive compensation, and the change in valuation allowance. The net decrease in the effective tax rate for the three months ended March 31, 2026 from the prior year comparable period was due to several factors, including a decrease of $0.5 million in state income taxes expense, net of federal benefits, a decrease of $1.1 million in tax expense associated with shortfalls from stock-based compensation, an increase of $1.0 million in the tax benefit from the cash surrender value in bank-owned life insurance policies, and a higher tax rate benefit due to an increase of $1.0 million in general business credits. These decreases were partially offset by an increase of $0.9 million in the amount of compensation expense that Note 10—Income Taxes (continued) was subject to the IRC 162(m) limitation on the deductibility of certain executive compensation and an increase in the valuation allowance recorded against our 2026 federal and state research credits. For the three months ended March 31, 2026, we recorded valuation allowances of $1.4 million against our 2026 federal research credits, which is reflected in change in valuation allowance, and $1.1 million against our 2026 state research credits, reflected in state income taxes, net of federal tax benefit in our effective tax rate reconciliation. We have made a policy election to account for Global Intangible Low-Taxed Income ("GILTI") in the year the GILTI tax is incurred. For the three months ended March 31, 2026 and 2025, the provision for GILTI tax expense was not material to our financial statements. We establish a valuation allowance when we consider it more-likely-than-not that some portion or all of the deferred tax assets will not be realized. As of March 31, 2026, we have a valuation allowance recorded against our 2026 federal research credits, state research credits, certain state net operating loss carryforwards, a portion of our capital loss carryforwards, and the deferred tax assets of our China subsidiary as we believe it is more-likely-than-not that the tax benefits related to these items will not be realized. During the three months ended March 31, 2026, we recorded a valuation allowance of approximately $2.5 million against our 2026 federal and state research credits as we determined it was more-likely-than-not that the benefit of these credits would not be realized; accordingly, no tax benefit was recognized for the 2026 federal and state research credits in the current period. All other valuation allowances previously recorded as of December 31, 2025 remained unchanged. As of December 31, 2025, we recorded a valuation allowance of approximately $21.6 million against our state research credits, certain state net operating loss carryforwards, a portion of our capital loss carryforwards, and the deferred tax assets of our China subsidiary as we determined it was more-likely-than-not that the tax benefits related to these items would not be realized. We are subject to examination by the Internal Revenue Service (the "IRS"), and various state tax authorities. We remain subject to examination of our federal income tax returns for the years ended December 31, 2022 through 2025. We generally remain subject to examination of our various state income tax returns for a period of four to five years from the respective dates that the returns were filed. As of March 31, 2026, we had federal net operating loss carryforwards of approximately $304.9 million, state net operating loss carryforwards of approximately $309.1 million, and capital loss carryforwards of approximately $2.5 million which will be available to offset future income. In regard to the federal net operating loss carryforwards, $9.0 million will expire between 2030 and 2034 and are subject to an annual IRC Section 382 limitation which restricts their utilization against taxable income in future periods, while the remaining balance of approximately $294.0 million does not expire and carries forward indefinitely. Of our total state net operating loss carryforwards, approximately $192.5 million will expire between 2028 and 2045, while the remaining balance of approximately $116.6 million does not expire and carries forward indefinitely. The capital loss carryforwards will expire in 2030. In addition, we have federal business tax credits of approximately $1.6 million that can be carried forward indefinitely and we have state business tax credits of approximately $24.4 million that can be carried forward indefinitely. As of March 31, 2026 and December 31, 2025, we had a liability of $12.4 million and $11.4 million, respectively, for unrecognized tax benefits related to various federal and state income tax matters excluding interest, penalties and related tax benefits. The reconciliation of the beginning unrecognized tax benefits balance to the ending balance is as follows:
| Three Months Ended March 31,
| 2026 |  | 2025
| (In thousands)
Beginning balance | $ | 11,423 |  |  | $ | 12,541 |
Increases related to positions taken during the current year | 966 |  |  | 1,314 |
Ending balance | $ | 12,389 |  |  | $ | 13,855 |
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate | $ | 12,010 |  |  | $ | 13,301 |
As of March 31, 2026 and 2025, we recognized accrued interest and penalties related to unrecognized tax benefits of approximately $1.3 million and $1.8 million, respectively.

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