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Note 7 - Income Taxes - Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Net operating loss carryforward $ 28,325 $ 26,571
Deferral of tax deduction of R&D expenses 6,820 6,857
Mandatory R&D Capitalization 5,602 3,819
Share-based compensation 1,687 1,591
Deferred Incentive Compensation 24 0
Deferred revenue 7,699 8,630
Research tax credits 5,698 5,295
Operating lease liabilities 841 1,043
Accruals and reserves 400 21
Total deferred tax assets 57,096 53,827
Unrealized gain (46) (41)
Depreciation (345) (346)
Operating lease right-of-use assets (925) (1,153)
Total deferred tax liabilities (1,316) (1,540)
Total gross deferred tax assets 55,780 52,287
Less: valuation allowance (55,780) (52,287)
Net deferred tax assets $ 0 $ 0