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Income Taxes
 12 Months Ended
Dec. 31, 2024
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Consolidated income (loss) before provision for income taxes consisted of the following (in thousands):
Year Ended December 31,
202420232022
U.S.$28,083 $(6,275)$292,460 
Non U.S.2,772 1,908 1,839 
Total$30,855 $(4,367)$294,299 
The components of the consolidated income tax provision for the years ended December 31, 2024, 2023 and 2022 were as follows (in thousands):
Year Ended December 31, 2024Year Ended December 31, 2023Year Ended December 31, 2022
Current
Federal$794 $(178)$(165)
State1,828 1,533 897 
Non-US924 667 411 
Total current tax expense3,546 2,022 1,143 
Deferred
Federal- - - 
State- - - 
Non-US- - - 
Total deferred tax expense- - - 
Total income tax expense$3,546 $2,022 $1,143 
The difference between the consolidated income tax provision and the amount computed by applying the federal statutory income tax rate to the consolidated income before income taxes in the years ended December 31, 2024, 2023 and 2022 were as follows (in thousands):
Year Ended December 31,
202420232022
Income tax provision (benefit) at federal statutory rate$6,480 $(917)$61,775 
State tax1,513 574 (2,942)
Business credits(623)(2,050)(3,246)
Uncertain tax positions156 334 586 
Deferred compensation charges2,410 830 (473)
Change in valuation allowance(7,862)1,466 (324)
Section 162(m) limitation1,986 1,963 1,779 
Mark-to-market of warrants- - (378)
Net operating loss and tax credit limitation(329)- (56,908)
Other (1)
(144)(518)879 
Foreign taxes(41)340 395 
Total income tax expense$3,546 $2,022 $1,143 
(1)Certain prior year amounts have been reclassified to conform to the current year presentation. In 2022, Foreign taxes were included in Other.
Deferred tax assets and liabilities consisted of the following (in thousands):
December 31,
20242023
Deferred tax assets:
Net operating loss carryforwards$77,843 $96,336 
Research credit carryforwards32,516 34,940 
Section 174 capitalization28,446 22,556 
Lease liability6,914 8,868 
Stock compensation11,479 10,572 
Accruals and reserves21,579 15,808 
Other563 348 
Total deferred tax assets179,340 189,428 
Less valuation allowance(172,525)(180,387)
Net deferred tax assets6,815 9,041 
Deferred tax liabilities:
Fixed assets(2,101)(2,667)
Operating lease right-of-use assets(4,714)(6,345)
Other— (29)
Total deferred tax liabilities(6,815)(9,041)
Net deferred tax assets$- $- 
The tax benefit of net operating losses, temporary differences and credit carryforwards is required to be recorded as an asset to the extent that management assesses that realization is "more likely than not." Realization of the future tax benefits is dependent on our ability to generate sufficient taxable income within the carryforward period. A high degree of judgment is required to determine if, and the extent to which, valuation allowances should be recorded against deferred tax assets. In making such determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent financial operations. Based on all available evidence as of December 31, 2024, both positive and negative, and the weight of that evidence to the extent such evidence can be objectively verified, management believes that recognition of the deferred tax assets arising from the above-mentioned future tax benefits is currently not more likely than not to be realized, and, accordingly, has provided a valuation allowance.
The valuation allowance decreased by $7.9 million during the year ended December 31, 2024 and increased by $1.5 million during the year ended December 31, 2023. The increase in valuation allowance during the year ended December 31, 2024 was due to a decrease in our deferred tax assets, predominantly related to utilization of net operating losses and research and development credits offset by Section 174 capitalization and increased reserves. The increase in valuation allowance during the year ended December 31, 2023 was due to an increase in our deferred tax assets, predominantly related to Section 174 capitalization and increased reserves offset largely by utilization of net operating losses.
As of December 31, 2024, we had federal net operating loss carryforwards of approximately $0.4 million, which began to expire in the year 2025, federal net operating loss carryforwards of approximately $293.1 million, which do not expire and federal research and development tax credits of approximately $26.5 million, which expire in the years 2025 through 2044.
As of December 31, 2024, we had net operating loss carryforwards for California and other states for income tax purposes of approximately $262.9 million, which expire in the years 2025 through 2041, and California state research and development tax credits of approximately $21.8 million, which do not expire.
As of December 31, 2024, we had no remaining net operating loss carryforwards for foreign income tax purposes.
Uncertain Income Tax positions
The total amount of unrecognized tax benefits was $12.4 million and $12.1 million as of December 31, 2024 and 2023, respectively. If recognized, none of the unrecognized tax benefits would affect the effective tax rate.
The following table summarizes the activity related to our unrecognized tax benefits:
Year Ended December 31,
20242023
Balance at beginning of year$(12,101)$(11,339)
Tax positions related to the current year
Additions(569)(762)
Reductions- - 
Tax positions related to the prior year
Additions270 - 
Reductions- - 
Settlements- - 
Lapses in statute- - 
Balance at end of year$(12,400)$(12,101)
Our policy is to account for interest and penalties as income tax expense. As of December 31, 2024, there were no interest and no material penalties recognized in the provision for income taxes. As of December 31, 2023, there were no interest and no penalties recognized in the provision for income taxes. We do not anticipate any significant change within 12 months of this reporting date of its uncertain tax positions.
The Tax Reform Act of 1986 limits the annual use of net operating loss and tax credit carryforwards in certain situations where changes occur in stock ownership of a company. In the event there is a change in ownership, as defined, the annual utilization of such carryforwards could be limited. For the year ended December 31, 2021, we completed a preliminary analysis under Section 382 of the Internal Revenue Code indicating we experienced ownership changes in 2008, 2010, 2012, and 2019 that limited the future use of our pre-change federal and state net operating loss carryforwards and federal research and development tax credits. We finalized the study during the year ended December 31, 2022 and concluded that we only experienced ownership changes in 2008, 2010, and 2012, resulting in a significant reduction in the federal and state net operating loss carryforwards and federal research and development tax credits that are expected to expire unused. We have revised the net operating loss carryforwards and research and development tax credits that are expected to expire unused as a result of the annual limitations in the deferred tax assets and corresponding uncertain tax positions as of December 31, 2022. There were no changes to our Section 382 analysis as of December 31, 2024.
We are subject to income tax examinations for U.S. federal and state income taxes from 2001 forward. We are subject to tax examination in Germany from 2020 forward, in India from 2021 forward and in Italy from 2021 forward.