Income Taxes
The loss before provision for income taxes for the Company’s operations was as follows (in thousands):
Year Ended December 31,
202520242023
United States$(226,958)$(78,156)$(135,411)
Foreign26,686 (13,714)(84,843)
Loss before provision for income taxes
$(200,272)$(91,870)$(220,254)
The components of income tax expense were as follows (in thousands):
Year Ended December 31,
202520242023
Current:
Federal$461 $636 $308 
State27 1,143 345 
Foreign3,950 2,376 1,704 
Total current tax expense
4,438 4,155 2,357 
Deferred:
Federal— — — 
State— — — 
Foreign— — — 
Total deferred income tax benefit— — — 
Income tax expense$4,438 $4,155 $2,357 
The expense for income taxes reconciles to the amount computed by applying the federal statutory rate to loss before taxes as follows (in thousands):
Year Ended December 31, 2025
$
%
Income tax benefit at federal statutory rate (1)
$(42,057)21.00 %
State income tax, net of federal benefit(2)
(1,038)0.52 %
Foreign tax effects
Switzerland
Foreign rate differential
(3,041)1.52 %
Changes in valuation allowance
(7,037)3.51 %
Other tax effects
166 (0.08)%
Other foreign jurisdictions
(1,722)0.86 %
Effect of changes in tax laws or rates enacted in the current period
— — %
Effect of cross-border tax laws
Subpart F income inclusion
348 (0.17)%
Tax credits
Research and development credits
(10,370)5.18 %
Foreign tax credits
(2,667)1.33 %
Changes in valuation allowance
54,580 (27.25)%
Nontaxable or nondeductible items
Non-deductible stock-based compensation
3,952 (1.97)%
Other non-deductible and non-taxable
(103)0.05 %
Other
Stock-based compensation - (windfall) shortfall
11,542 (5.76)%
Net impact on liquidation of foreign subsidiary
(17,262)8.62 %
Other
1,850 (0.94)%
Changes in unrecognized tax benefits
17,297 (8.64)%
Income tax expense
$4,438 (2.22)%
Year Ended December 31,
20242023
Income tax benefit at federal statutory rate (1)
$(19,293)$(46,253)
State income tax, net of federal benefit(1,444)(1,313)
Convertible debt repurchase transaction
1,658 — 
Research and development credits(7,865)(6,283)
Section 382 limitation— (5)
Stock-based compensation5,772 14,904 
Officers' compensation1,043 1,547 
Recognition of acquired deferred tax assets
— (5,048)
Acquired IPR&D expenses— 14,938 
Cross-border tax impacts
(1,422)(307)
Foreign rate differential
2,075 
Other1,159 1,374 
Change in valuation allowance22,472 28,796 
Income tax expense
$4,155 $2,357 
(1)For the years ended December 31, 2025, 2024 and 2023, the U.S. federal statutory tax rate was 21%.
(2)The state of California comprises greater than 50% of our state tax benefit.
The amounts of cash income taxes paid, net of refunds received, by the Company are as follows:
Year Ended December 31,
2025
Federal
$2,246 
State
Illinois
353 
Other states
775 
Foreign
Netherlands
1,541 
Other foreign
141 
Total cash paid in income taxes, net of refunds received
$5,056 
Significant components of the Company’s net deferred income tax assets as of December 31, 2025 and 2024 are shown in the table below (in thousands). The Company assesses all available positive and negative evidence to estimate whether sufficient future taxable income will be generated to permit use of the existing deferred tax assets. A significant piece of objective negative evidence evaluated was the cumulative book loss incurred over the three-year period ended December 31, 2025. Such objective evidence limits the ability to consider other subjective evidence, such as projections for future growth. On the basis of this analysis, a valuation allowance of $270.3 million and $210.4 million as of December 31, 2025 and 2024, respectively, was recorded to offset the net deferred tax asset as realization of such asset is uncertain. However, the amount of the deferred tax asset considered realizable could be adjusted if estimates of future taxable income during the carryforward period are increased, or if objective negative evidence in the form of cumulative losses is no longer present and additional weight is given to subjective evidence such as the Company’s projections for future growth.
December 31,
20252024
Deferred tax assets:
Net operating loss (NOL) carryforwards$62,970 $40,536 
Research and development tax credits carryforwards56,670 32,298 
Capitalized research and development expenses57,122 74,974 
Accrued compensation31,339 38,053 
Lease liabilities31,996 29,165 
Warranty reserve
13,096 12,222 
Intangible assets
30,390 — 
Other13,771 8,610 
Total deferred tax assets297,354 235,858 
Deferred tax liabilities:
Fixed assets
(4,185)(5,485)
Operating lease right-of-use assets(22,887)(19,792)
Other— (218)
Total deferred tax liabilities(27,072)(25,495)
Less valuation allowance(270,282)(210,363)
Net deferred tax assets$— $— 
As of December 31, 2025, the Company had accumulated federal and state NOL carryforwards of approximately $379.0 million, and $349.3 million, respectively. Out of the total federal NOL carryforwards, approximately $295.3 million were generated after January 1, 2018, and therefore do not expire. NOLs generated after January 1, 2018, are subject to 80% limitation in accordance with the Tax Cuts and Jobs Act of 2017. The remaining federal NOL carryforwards of $83.7 million will begin to expire in 2034, and state NOL carryforwards continue to expire. The California NOL carryforwards of $200.5 million will begin expiring in 2029. The Company had approximately $34.3 million of international carryforwards as of December 31, 2025, which begin to expire in 2030.
The Company also has federal and California research and development credit carryforwards of approximately $41.0 million and $38.4 million, respectively, as of December 31, 2025. The federal research and development credit carryforwards will begin expiring in 2040, unless previously utilized. The California research and development credit will carry forward indefinitely.
Use of the Company's NOL and research and development credit carryforwards may be subject to a substantial annual limitation due to ownership change limitations provided by Section 382 of the Internal Revenue Code of 1986, as amended, and similar state provisions. The annual limitations may result in the expiration of NOL carryforwards before utilization. The Company has completed an analysis through December 31, 2024 to determine whether its NOLs and credits are likely to be limited by Section 382. The Company is currently in a loss position for the year ended December 31, 2025 and will continue monitoring future ownership changes under Section 382. Additionally, ownership changes occurring after December 31, 2025 and future years may also limit the Company’s ability to fully utilize any remaining tax benefits.
The evaluation of uncertainty in a tax position is a two-step process. The first step involves recognition. The Company determines whether it is more likely than not that a tax position will be sustained upon tax examination, including resolution of any related appeals or litigation, based on only the technical merits of the position. The technical merits of a tax position are derived from both statutory and judicial authority (legislation and statutes, legislative intent, regulations, rulings, and case law) and their applicability to the facts and circumstances of the tax position. If a tax position does not meet the more-likely-than-not recognition threshold, the benefit of that position is not recognized in the financial statements. The second step is measurement. A tax position that meets the more-likely-than-not recognition threshold is measured to determine the amount of benefit to recognize in the financial statements. The tax position is measured as the largest amount of benefit that is greater than 50% likely of being realized upon ultimate resolution with a taxing authority.
The following table summarizes the activity related to the Company’s gross unrecognized tax benefits at the beginning and end of the years ended December 31, 2025, 2024 and 2023 (in thousands):
Year Ended December 31,
202520242023
Gross unrecognized tax benefits at the beginning of the year$27,474 $21,527 $16,986 
Increases related to current year positions49,606 5,947 3,961 
Increases (decreases) related to prior year positions(8,941)— 580 
Gross unrecognized tax benefits at the end of the year$68,139 $27,474 $21,527 
As of December 31, 2025 and 2024, the Company had $39.8 million and $24.9 million of unrecognized tax benefits, respectively, that, if recognized and realized would impact the effective tax rate, subject to the valuation allowance.
The Company’s practice is to recognize interest and penalties related to income tax matters in income tax expense. The Company had no material accrual for interest and penalties on the Company’s consolidated balance sheets and the amount of interest and penalties recognized in the consolidated statements of operations were not material for the years ended December 31, 2025, 2024 and 2023.
The Company is subject to taxation in the United States and various foreign and state jurisdictions. Prior to 2018, the losses were all attributable to the United States. The Company’s tax years from 2006 (inception) are subject to examination by the United States and state authorities due to the carry forward of unutilized NOLs and research and development credits.

Undistributed earnings of the foreign subsidiaries are indefinitely reinvested. Thus, the Company has not recognized any deferred taxes on foreign unremitted earnings.
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Historical Timeline

Fiscal YearFiled
2025Feb 19, 2026Showing above
2024Feb 26, 2025
2023Feb 21, 2024
2022Feb 22, 2023
2021Feb 22, 2022
2020Feb 24, 2021
2019Feb 24, 2020
2018Feb 26, 2019
2017Mar 1, 2018
2016Mar 8, 2017
2015Feb 24, 2016

About Income Taxes Disclosures

The income tax disclosure reveals how much a company actually pays in taxes versus what the statutory rate would predict. Analysts focus on the effective tax rate (ETR) reconciliation, which breaks down every item driving the gap between the 21% federal rate and the company's reported ETR — including R&D credits, foreign rate differentials, and state taxes. Deferred tax assets (DTAs) and their valuation allowances signal management's confidence in future profitability: a rising allowance suggests the company doubts it can use accumulated tax benefits. Uncertain tax benefit (UTB) reserves quantify exposure to IRS challenges on aggressive positions.

Key signals to watch: sudden ETR drops without clear operational reasons, large increases in valuation allowances, growing UTB balances, and significant unremitted foreign earnings. Post-TCJA, pay attention to GILTI and BEAT provisions that affect multinational tax structures. Compare the cash taxes paid (from the cash flow statement) against the income tax provision to gauge earnings quality.