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Stock-Based Compensation (Schedule of Share Option Activity) (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	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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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.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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