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Note 15 - Share-based Compensation - Effect of Share-based Compensation On the Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Share-based compensation | $ 2,222 | $ 2,823 | $ 4,508 | $ 5,772
Research and Development Expense [Member] |  |  |  |
Share-based compensation | 496 | 673 | 1,021 | 1,398
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based compensation | $ 1,726 | $ 2,150 | $ 3,487 | $ 4,374

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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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