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Note 15 - Equity-based Compensation - Summary of Stock-based Compensation Expense Included in Results of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Stock-based compensation expense |  | $ 224 | $ 130 | $ 702
General and administrative | $ (208) |  |  |
Research and Development Expense [Member] |  |  |  |
Stock-based compensation expense | 5 | 2 | 14 | 8
Selling and Marketing Expense [Member] |  |  |  |
Stock-based compensation expense | 12 | 53 | 37 | 118
General and Administrative Expense [Member] |  |  |  |
Stock-based compensation expense |  | $ 169 | $ 79 | $ 576
General and administrative | $ (225) |  |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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