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Note 15 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
|  | Year Ended December 31, |
|  | 2024 |  |  | 2023 |
Domestic |  | $ | (27,044 | ) |  | $ | (35,039 | )
International |  |  | (11,922 | ) |  |  | (10,716 | )
Loss before income taxes |  | $ | (38,966 | ) |  | $ | (45,755 | )
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Year Ended December 31, |
|  | 2024 |  |  | 2023 |
Current: |  |  |  |  |  |  |  |
Federal |  | $ | 5 |  |  | $ | (141 | )
State |  |  | (13 | ) |  |  | (9 | )
Foreign |  |  | (36 | ) |  |  | (37 | )
Sub-total |  | $ | (44 | ) |  | $ | (187 | )
Deferred: |  |  |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | (17 | )
State |  |  | — |  |  |  | — |
Foreign |  |  | — |  |  |  | — |
Sub-total |  | $ | — |  |  | $ | (17 | )
Total |  | $ | (44 | ) |  | $ | (204 | )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year Ended |  |  |  |  |  |  | Year Ended |  |  |  |  |
|  | December 31, |  |  |  |  |  |  | December 31, |  |  |  |  |
|  | 2024 |  |  | % |  |  | 2023 |  |  | % |
Income taxes computed at statutory rates |  | $ | 8,183 |  |  |  | (21 | )% |  | $ | 9,609 |  |  |  | (21 | )%
(Increases) decreases resulting from: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in valuation allowance |  |  | (9,319 | ) |  |  | 24 | % |  |  | (11,716 | ) |  |  | 26 | %
NOL surrendered for refundable tax credit |  |  | (1,355 | ) |  |  | 4 | % |  |  | (1,607 | ) |  |  | 4 | %
Foreign research deductions and credits |  |  | 650 |  |  |  | (2 | )% |  |  | 803 |  |  |  | (2 | )%
Federal and state research and experimentation credits |  |  | 1,288 |  |  |  | (3 | )% |  |  | 1,412 |  |  |  | (3 | )%
State income taxes, net of federal tax benefit |  |  | (139 | ) |  |  | — | % |  |  | 468 |  |  |  | (1 | )%
Other |  |  | 648 |  |  |  | (2 | )% |  |  | 827 |  |  |  | (3 | )%
Total |  | $ | (44 | ) |  |  | — | % |  | $ | (204 | ) |  |  | — | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Deferred tax assets: |  |  |  |  |  |  |  |
Federal and state net operating losses |  | $ | 79,856 |  |  | $ | 77,201 |
Federal and state research and experimentation credits |  |  | 13,610 |  |  |  | 12,406 |
Research and experimental costs |  |  | 12,806 |  |  |  | 9,458 |
Stock based compensation |  |  | 1,822 |  |  |  | 1,474 |
ASC 842 - lease liabilities |  |  | 1,303 |  |  |  | 1,468 |
Accrued compensation |  |  | 324 |  |  |  | 610 |
Fixed asset differences |  |  | 191 |  |  |  | 185 |
Intangible asset differences |  |  | 4 |  |  |  | — |
Other |  |  | 264 |  |  |  | 59 |
Total gross deferred tax assets |  |  | 110,180 |  |  |  | 102,861 |
Less valuation allowance |  |  | (104,361 | ) |  |  | (95,256 | )
Net deferred tax assets |  | $ | 5,819 |  |  | $ | 7,605 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Patent expenditures |  | $ | (888 | ) |  | $ | (1,096 | )
ASC 842 - right of use assets |  |  | (795 | ) |  |  | (897 | )
Fixed asset differences |  |  | (4 | ) |  |  | (9 | )
Intangible asset differences |  |  | (4,132 | ) |  |  | (5,603 | )
Total gross deferred tax liabilities |  | $ | (5,819 | ) |  | $ | (7,605 | )
Total net deferred tax assets and liabilities |  | $ | — |  |  | $ | — |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | Year Ended December 31, |
|  | 2024 |  |  | 2023 |
Beginning balance |  | $ | 1,063 |  |  | $ | 1,046 |
Addition for current year tax positions |  |  | 85 |  |  |  | 94 |
Addition for prior year tax positions |  |  | — |  |  |  | — |
Reduction for prior year positions |  |  | (11 | ) |  |  | (77 | )
Reduction for prior year positions resolved during the current year |  |  | — |  |  |  | — |
Ending balance |  | $ | 1,137 |  |  | $ | 1,063 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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