Note 13 – Income Taxes

Losses before taxes by jurisdiction for the years ended December 31, 2025 and 2024 are as follows (in thousands):

For the year ended December 31,

  ​ ​ ​

2025

  ​ ​ ​

2024

Domestic

$

(9,593)

$

(18,398)

Foreign

 

 

Loss before taxes

$

(9,593)

$

(18,398)

Current and deferred income tax expense for the years ended December 31, 2025 and 2024 are as follows (in thousands):

For the year ended December 31,

Current

  ​ ​ ​

2025

  ​ ​ ​

2024

Federal

$

$

State

 

 

Foreign

 

 

Total income tax expense

$

$

Note 13 – Income Taxes, continued

For the year ended December 31,

Deferred

  ​ ​ ​

2025

  ​ ​ ​

2024

Federal

$

$

State

 

 

Foreign

 

 

Total income tax expense

$

$

During the year ended December 31, 2025, the Company adopted ASU 2023-09 to enhance the income taxes disclosure and the rate reconciliation disclosure. See Note 3 – Summary of Significant Accounting Policies, Adoption of New Accounting Standard for additional details.

A summary of taxes paid by jurisdiction for the years ended December 31, 2025 and 2024 is as follows:

For the year ended December 31,

  ​ ​ ​

2025

  ​ ​ ​

2024

Federal

$

$

State

 

 

Foreign

 

 

Total income taxes paid

$

$

Reconciliation between the effective tax rate on income from continuing operations and the statutory tax rate of 21% is as follows:

For the year ended December 31, 2025

For the year ended December 31, 2024

 

  ​ ​ ​

Amount (in

  ​ ​ ​

  ​ ​ ​

Amount (in

  ​ ​ ​

 

thousands)

Rate

thousands)

Rate

Income tax benefit at federal statutory rate

 

$

(2,015)

21.0

%

$

(3,864)

21.0

%

Tax credits:

 

Research and development credit

 

(238)

2.5

(447)

 

2.4

Change in valuation allowance

 

2,054

(21.4)

3,555

 

(19.3)

Nontaxable or nondeductible items:

 

 

Other

(8)

(168)

0.9

Excess tax deficit on stock awards

 

184

(1.9)

164

 

(0.9)

Changes in unrecognized tax benefits

24

(0.2)

760

(4.1)

Other adjustments

(1)

Effective income tax rate

 

$

0.0

%

$

0.0

%

Note 13 – Income Taxes, continued

As of December 31, 2025 and 2024, the Company’s deferred tax assets (liabilities) consisted of the effects of temporary differences attributable to the following (in thousands):

December 31, 

  ​ ​ ​

2025

  ​ ​ ​

2024

Deferred tax assets:

 

  ​

 

  ​

Research and development tax credits

$

11,470

$

11,087

Net operating loss (“NOL”) carryovers

 

92,392

 

87,825

Property and equipment

 

75

 

197

Research and development (“R&D”) costs

 

3,802

 

6,919

Start-up and organizational costs

 

7

 

9

Stock-based compensation

 

107

 

338

Operating lease liability

 

254

 

176

Other accruals and reserves

 

321

 

215

Total gross deferred tax assets

 

108,428

 

106,766

Less: valuation allowance

 

(108,223)

 

(106,627)

Total deferred tax assets

 

205

 

139

Deferred tax liabilities:

 

 

Operating lease right-of-use asset

 

(205)

 

(139)

Total deferred tax liabilities

 

(205)

 

(139)

Total deferred taxes, net

$

$

The Company considers all available evidence, both positive and negative, including historical levels of taxable income, expectations and risks associated with estimates of future taxable income, and ongoing prudent and feasible tax planning strategies in assessing the need for a valuation allowance. Because of the Company’s recent history of operating losses, management believes that it is more likely than not that all of the Company’s deferred tax assets will not be realized and accordingly, has provided a full valuation allowance for its deferred tax asset as of December 31, 2025 and 2024.

The change in the Company’s valuation allowance is as follows:

  ​ ​ ​

2025

  ​ ​ ​

2024

January 1,

$

106,627

$

104,318

Increase in valuation allowance

 

1,596

 

2,309

December 31,

$

108,223

$

106,627

As of December 31, 2025 and 2024, the Company has NOL carryforwards for U.S. federal income tax purposes of approximately $340.0 million and $320.2 million, respectively, and for state income tax purposes, approximately $304.5 million and $294.9 million, respectively. NOL carryforwards of $255.3 million will be carried forward indefinitely for U.S. federal tax purposes and $84.7 million will expire beginning in 2033. State net operating loss carryforwards, if not utilized, will begin to expire on various dates starting in 2033. The Company has federal and state R&D tax credit carryforwards of approximately $7.8 million and $6.2 million, respectively. The federal R&D credit carryforwards will expire beginning in 2032 and state R&D credit carryforwards do not expire.

Under Section 382 and 383 of the Internal Revenue Code of 1986, as amended, or the Code, if a corporation undergoes an “ownership change,” the corporation’s ability to use its pre-change net operating loss carryforwards and other pre-change attributes, such as research tax credits, to offset its post-change income may be limited. As a result of such ownership changes, the annual limitation may result in the expiration of net operating losses and credits before utilization. In general, an “ownership change” will occur if there is a cumulative change in the Company’s ownership by “5-percent shareholders” that exceeds 50 percentage points over a rolling three-year period. Similar rules may apply under state tax laws.

Note 13 – Income Taxes, continued

The Company accounts for uncertain tax position in accordance with ASC 740. Tax positions are evaluated in a two-step process, whereby the Company first determines whether it is more likely than not that a tax position will be sustained upon examination by tax authorities, including resolutions of any related appeals or litigation processes, based on technical merit. If a tax position meets the more-likely-than-not recognition threshold it is then measured to determine the amount of benefit to recognized 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 settlement.

The total amount of unrecognized tax benefits as of December 31, 2025 is $1.4 million. If recognized, none of the unrecognized tax benefits would impact the effective tax rate because of the valuation allowance. The Company recognizes interest and penalties related to income tax matters as a component of income tax expense. As of December 31, 2025, there were no accrued interest and penalties related to unrecognized tax benefits. The Company does not anticipate any significant change of the unrecognized tax benefits within twelve months of this reporting date.

A reconciliation of the beginning and ending balance of total unrecognized tax benefits is as follows (in thousands):

  ​ ​ ​

2025

  ​ ​ ​

2024

Unrecognized tax benefit at beginning of year

$

1,357

$

Gross increases - tax positions in prior period

3

 

1,275

Gross increases - tax positions in current period

45

 

82

Unrecognized tax benefit at end of year

$

1,405

$

1,357

The Company files income tax returns in the U.S. federal and various state jurisdictions. Due to the Company’s net operating loss carryforwards, all tax years since inception remain subject to examination by all taxing authorities. The Company is not currently under audit in any tax jurisdiction.

Historical Timeline

Fiscal YearFiled
2025Mar 26, 2026Showing above
2024Feb 27, 2025
2023Mar 28, 2024
2022Mar 30, 2023
2021Mar 23, 2022
2020Mar 24, 2021
2019Mar 13, 2020
2018Feb 28, 2019
2017Mar 16, 2018
2016Mar 16, 2017
2015Mar 15, 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.