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Note 15 - Income Taxes - Significant Components of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Federal net operating loss carryforwards $ 12,405 $ 10,847
State net operating loss carryforwards 2,687 2,228
Research and development credits 3,273 2,716
Section 174 Capitalization 7,294 0
Share-based compensation 701 706
Lease liabilities 801 1,131
Capitalized licensing fees 1,591 1,637
Other 70 22
Subtotal 28,822 19,287
Less valuation allowance (28,013) (18,113)
Deferred tax assets, net of valuation allowance 809 1,174
Right-of-use assets (809) (1,116)
Other 0 (58)
Net deferred tax assets $ 0 $ 0