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Stock-Based Compensation (Schedule of Share Option Activity) (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Number of Options Outstanding
Options outstanding at December 31, 2020	602,683
Granted	154,653	56,400
Exercised	0	0
Cancelled/forfeited	(36,548)
Options outstanding at September 30, 2021	720,788		602,683
Unvested	503,910
Vested and exercisable	216,878
Weighted Average Exercise Price Per Share
Options outstanding at December 31, 2020	$ 11.01
Granted	6.29
Exercised	0
Cancelled/forfeited (in dollars per share)	11.03
Options outstanding at September 30, 2021	10.00		$ 11.01
Unvested	4.72
Vested and exercisable	$ 22.25
Weighted Average Remaining Contractual Term (Years)
Options outstanding	8 years 5 months 19 days		9 years 4 months 20 days
Unvested	9 years 3 months
Vested and exercisable	6 years 7 months 24 days
Aggregate Intrinsic Value
Options Outstanding at December 31, 2020	$ 1,861
Unvested	444
Vested and exercisable	104
Options outstanding at September 30, 2021	$ 547		$ 1,861

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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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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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