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Note 18 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Net operating losses $ 36,943 $ 35,234
Acquisition assets 2,257 0
Stock options 665 750
Research and development credits 641 641
Accruals 477 464
Operating lease liabilities 368 472
Property and equipment 28 13
Other deferred tax assets 6 331
Total deferred tax assets 41,385 37,905
Deferred tax liabilities:    
Operating lease right-of-use assets (337) (472)
Total deferred tax liabilities (337) (472)
Valuation allowance (41,048) (37,433)
Net deferred taxes $ 0 $ 0