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Note 18 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Net operating losses $ 35,234 $ 33,455
Stock options 750 884
Research and development credits 641 641
Accruals 464 306
Operating lease liabilities 472 19
Property and equipment 13 10
Other deferred tax assets 331 376
Total deferred tax assets $ 37,905 35,691
Operating lease right-of-use assets   (19)
Total deferred tax liabilities   (19)
Valuation allowance   (35,672)
Net deferred taxes   $ 0