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Income Taxes - Significant portions of deferred income tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
NOL carryforwards $ 30,421 $ 27,002
Fixed assets and intangibles 2,371 2,306
Accruals 815 108
Inventory 76 229
Other 87  
Capitalized R&D expenses 4,613  
Stock-based compensation expense 76 63
Total deferred tax assets 38,459 29,708
Deferred tax liabilities:    
Prepaid expenses (101) (78)
Total deferred income tax assets and liabilities 38,358 29,630
Less: valuation allowance $ (38,358) $ (29,630)