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Stock-Based Compensation (Schedule of Share Option Activity) (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Number of Options Outstanding |  |  |
Options outstanding | 602,683 | 100,279 |
Granted | 552,153 | 511,800 |
Exercised (in shares) | (6,600) | 0 |
Cancelled/forfeited | (48,879) | (9,396) |
Options outstanding | 1,099,357 | 602,683 | 100,279
Unvested | 801,924 |  |
Vested and exercisable | 297,433 |  |
Weighted Average Exercise Price Per Share |  |  |
Options outstanding at December 31, 2020 | $ 11.01 | $ 54.40 |
Granted | 4.26 | 4.17 |
Exercised | 3.35 | 0 |
Cancelled/forfeited (in dollars per share) | 14.18 | 101.05 |
Options outstanding at September 30, 2021 | 7.53 | $ 11.01 | $ 54.40
Unvested | 4.14 |  |
Vested and exercisable | $ 16.66 |  |
Weighted Average Remaining Contractual Term (Years) |  |  |
Options outstanding | 8 years 11 months 26 days | 9 years 4 months 20 days | 8 years 7 months 13 days
Unvested | 9 years 5 months 26 days |  |
Vested and exercisable | 7 years 7 months 13 days |  |
Aggregate Intrinsic Value |  |  |
Options Outstanding | $ 189 | $ 4 | $ 4
Options Outstanding | 4 | $ 4 |
Unvested | 180 |  |
Vested and exercisable | $ 9 |  |

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- Definition Weighted average remaining contractual term for unvested options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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