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Note 12 - Share-Based Compensation - Schedule of Recognized Period Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Stock-based compensation | $ 2,641 | $ 3,235 | $ 8,067 | $ 8,959
Research and Development Expense [Member] |  |  |  |
Stock-based compensation | 1,063 | 1,305 | 3,146 | 3,710
Selling, General and Administrative Expenses [Member] |  |  |  |
Stock-based compensation | 1,578 | 2,054 | 4,921 | 5,456
Continuing Operations [Member] |  |  |  |
Stock-based compensation | 2,641 | 3,359 | 8,067 | 9,166
Discontinued Operations [Member] |  |  |  |
Stock-based compensation | $ 0 | $ (124) | $ 0 | $ (207)

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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