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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based compensation expense | $ 744 | $ 3,783 | $ 393
Employee Stock Option Plans |  |  |
Share-based compensation expense | 743 | 3,761 | 363
Non-Employee Stock Option Agreements |  |  |
Share-based compensation expense | 1 | 22 | 30
Research & Development Expenses |  |  |
Share-based compensation expense | 177 | 485 | 6
Selling & Marketing Expenses |  |  |
Share-based compensation expense | 280 | 820 | 209
General & Administrative Expenses |  |  |
Share-based compensation expense | $ 287 | $ 2,478 | $ 178

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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