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Note 18 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating losses $ 33,455 $ 31,115
Stock options 884 790
Research and development credits 641 641
Accruals 306 267
Operating lease liabilities 19 109
Property and equipment 10 2
Other deferred tax assets 376 81
Total deferred tax assets 35,691 33,005
Operating lease right-of-use assets (19) (108)
Total deferred tax liabilities (19) (108)
Valuation allowance (35,672) (32,897)
Net deferred taxes $ 0 $ 0