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Income Taxes (Reconciliation of Taxes at the Federal Statutory Rate) (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Income Taxes [Abstract] |  |
Tax at federal statutory rate | 21.00% | 21.00%
Permanent differences | (4.30%) | (2.10%)
Research and development ("R&D") tax credit | 1.40% | 0.80%
Uncertain tax position | (0.30%) | (0.30%)
State, net of federal benefit | 2.60% | (0.50%)
Deferred rate change | 0.40% | 0.30%
Change in valuation allowance | (21.20%) | (19.50%)
Total | (0.40%) | (0.30%)

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