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Stockholders' Equity (Stock-based Compensation Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation | $ 884 | $ 606 | $ 2,427 | $ 2,368
General and Administrative [Member] |  |  |  |
Share-based Compensation | 229 | 348 | 793 | 1,213
Research and Development [Member] |  |  |  |
Share-based Compensation | $ 655 | $ 258 | $ 1,634 | $ 1,155

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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