Stockholders' Equity and Stock-Based Compensation (Details 3) - USD ($) |
12 Months Ended | |
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Dec. 31, 2019 |
Dec. 31, 2018 |
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Stockholders' Equity and Stock-Based Compensation (Details 3) | ||
Research and development expenses | $ 398,000 | $ 966,000 |
General and administrative expenses | 425,000 | 1,414,000 |
Total stock-based compensation expense | $ 823,000 | $ 2,380,000 |
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