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Stockholders' Equity (Stock-based Compensation Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Total stock-based compensation expense | $ (450) | $ 568
General and administrative |  |
Total stock-based compensation expense | 200 | 436
Research and development |  |
Total stock-based compensation expense | $ (650) | $ 132

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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 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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