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Stockholders' Equity (Stock-based Compensation Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Total stock-based compensation expense | $ 42 | $ 100 | $ (500) | $ 380 | $ 568 | $ 2,283
General and administrative |  |  |  |  |  |
Total stock-based compensation expense | 52 | 119 | 150 | 381 | 436 | 700
Research and development |  |  |  |  |  |
Total stock-based compensation expense | $ (10) | $ (19) | $ (650) | $ (1) | $ 132 | $ 1,583

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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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