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Stockholders Equity (Stock-based Compensation Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Total stock-based compensation expense | $ (619) | $ 45 | $ (542) | $ 280
General and administrative |  |  |  |
Total stock-based compensation expense | 51 | 153 | 98 | 262
Research and development |  |  |  |
Total stock-based compensation expense | $ (670) | $ (108) | $ (640) | $ 18

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