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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2024
Income Tax Disclosure [Abstract]  
A reconciliation of income tax benefit to the amount computed by applying the Federal income tax rate to loss before provision for income taxes as of December 31, 2024 and 2023 is as follows:

A reconciliation of income tax benefit to the amount computed by applying the Federal income tax rate to loss before provision for income taxes as of December 31, 2024 and 2023 is as follows:

 

   2024   2023 
Income tax credit at statutory rates  $937   $(921)
Under accrual of income taxes   (1)   (3)
Nondeductible expenses   5    23 
Record tax credits   (116)    (118)
Permanent tax deduction stock options exercised   (27)   (63)
State income tax, net of federal benefits   179    (165)
Expiration of net operating losses and credits   332    1,492 
Effect of change in deferred tax rate   49    45 
Expiration of stock options   46    60 
Other   (39)    — 
Change in valuation allowance   (1,138)   (344)
   $227   $ 6 
Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred income taxes consist of the following:

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred income taxes consist of the following:

 

             
   As of December 31, 
   2024   2023 
Deferred tax liabilities:          
Excess tax depreciation  $(496)   (477)
ASC 842 operating lease asset   (1,938)   (1,975)
Total deferred tax liabilities   (2,434)   (2,452)
           
Deferred tax assets:          
Net operating loss carryforwards  $10,218   $12,020 
179 Carryforwards   —    245 
163(j) Business interest limitation carryforwards   —    302 
Inventory and other allowances   764    239 
Excess book amortization   60    60 
174 research and experimental expenditures   1,053    902 
Share-based compensation   788    530 
Tax credits   189    118 
ASC 842 operating lease liability   2,520    2,610 
Other accrued costs   293    13 
Total deferred tax assets   15,885    17,039 
           
Less:  valuation allowance   (13,451)   (14,587)
Deferred income taxes  $—   $—