Stockholders Equity (Stock-based Compensation Expense) (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
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| Share-based Compensation | $ 3,308 | $ 2,987 |
| General and administrative [Member] | ||
| Share-based Compensation | 1,030 | 1,550 |
| Research and development [Member] | ||
| Share-based Compensation | $ 2,278 | $ 1,437 |
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- Definition Amount of noncash expense for share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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