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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2025
Income Tax Disclosure [Abstract]  
Schedule of Income (Loss) Before Provision for Income Taxes

Income/(Loss) before provision for income taxes consisted of the following for the year ended December 31, 2025 and 2024 (in thousands):

 

   2025   2024 
United States  $(20,100)  $(22,215)
International   52    20 
Loss before provision for income taxes  $(20,048)  $(22,195)
Schedule of Income Tax Expenses (Benefit) by Jurisdiction

The income tax expense (benefit) by jurisdiction for the year ended December 31, 2025 and 2024, were as follows (in thousands):

 

   2025   2024 
Current:                  
Federal  $

—

   $— 
State and local   1    — 
Foreign   14    14 
           
Total current  $

15

   $14 
           
Deferred:          
Federal  $

—

   $— 
State and local   —    — 
Foreign   —    — 
Total deferred   —    — 
Total tax expense  $

15

   $14 
Schedule of Reconciliation of Income Tax Benefit

A reconciliation of the benefit for income taxes to the amount computed by applying the 21% statutory U.S. federal income tax rate to loss before income taxes for the year ended December 31, 2025, after the adoption of ASU 2023-09, is as follows (in thousands, except for percentages):

 

   Amount   Percent 
   2025 
   Amount   Percent 
U.S. Federal statutory tax rate  $(4,210)   21%
State tax, net of federal income tax effect(1)   1    —%
Enactment of new tax laws   —    —%
Effect of cross-border tax laws   —    —%
Tax credits   (299)   2%
Change in valuation allowance   3,519    (17)%
Nontaxable or non-deductible items          
Non-deductible expenses   30    —%
Stock based compensation   121    (1)%
Worldwide changes in unrecognized tax benefits   342    (2)%
Other          
Deferred tax adjustments   139    (1)%
Non-controlling interest   348    (2)%
Other   10    —%
Foreign tax effects          
Germany          
Foreign employee stock based compensation   11    

—

%
Rate differential   (4)   —%
Other   1    —%
Australia          
Rate differential   (1)   —%
Change in valuation allowance   7    —%
Effective income tax rate  $15    —%

  

(1) California contributes to the majority (greater than 50%) of the tax effect in this category for 2025.

 

The Company adopted ASC 2023-09 on a prospective basis. A reconciliation of the benefit for income taxes to the amount computed by applying the 21% statutory U.S. federal income tax rate to loss before income taxes for the year ended December 31, 2024, before the adoption of ASU 2023-09, is as follows:

 Schedule of U.S. Federal Income Tax Rates Indicated to Pretax Loss From Operations

   2024 
Computed tax benefit at U.S. federal statutory tax rate   21%
Permanent differences   —%
State tax benefit   7%
Stock based compensation   (3)%
Other permanent differences   (1)%
Change in valuation allowance   (25)%
Research and development credit   —%
Change in fair value of debt   1%
Stock issuance cost   —%
Acquired startup costs   —%
Pretax loss from operations rates total   —%
Schedule of Cash Paid for Income Taxes, Net of Refunds Received

Upon adoption of ASU 2023-09, cash paid for income taxes, net of refunds received, were as follows (in thousands):

 

   Year Ended December 31, 2025 
Federal taxes  $— 
State and local taxes   1 
Foreign taxes:   — 
Australia   — 
Germany   16 
Total cash paid for income taxes, net of refunds  $17 
Schedule of Components of Deferred Tax Assets and Liabilities

The primary components of the deferred tax assets and liabilities at December 31, 2025 and 2024 were as follows (in thousands):

 

   2025   2024 
Deferred tax assets/(liabilities):                    
Net operating loss carryforwards  $

25,920

   $20,221 
Research and development credit carryforwards   928    931 
Stock-based and other compensation   2,355    2,135 
Lease liability   479    859 
Capitalized research and development expenditures   3,520    4,247 
Depreciation and amortization   1,315    1,393 
Accrued liabilities and other reserves   178    446 
Total deferred tax assets   34,695    30,232 
Right-of-use and other assets   (480)   (830)
Total deferred tax liabilities   (480)   (830)
Valuation allowance   (34,215)   (29,402)
Net deferred tax asset  $—   $— 
Schedule of Unrecognized Tax Benefit

A reconciliation of the beginning and ending unrecognized tax benefit amount is as follows (in thousands):

 

   2025   2024 
   December 31, 
   2025   2024 
Balance at the beginning of the year  $1,799   $1,517 
Additions based on tax positions related to current year   282    282 
Adjustments based on tax positions related to prior years   283    — 
Balance at end of year  $2,364   $1,799