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Stock-Based Compensation (Schedule of Share Option Activity) (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Number of Options Outstanding
Options outstanding at December 31, 2020	602,683
Granted	129,153	36,400
Exercised	0	0
Cancelled/forfeited	(74)
Options outstanding at June 30, 2021	731,762		602,683
Unvested	558,002
Vested and exercisable	173,760
Weighted Average Exercise Price Per Share
Options outstanding at December 31, 2020	$ 11.01
Granted	6.57
Exercised	0
Cancelled/forfeited (in dollars per share)	2,570.42
Options outstanding at June 30, 2021	9.97		$ 11.01
Unvested	4.89
Vested and exercisable	$ 26.28
Weighted Average Remaining Contractual Term (Years)
Options outstanding	9 years 14 days		9 years 4 months 20 days
Unvested	9 years 5 months 8 days
Vested and exercisable	7 years 9 months 14 days
Aggregate Intrinsic Value
Options Outstanding at December 31, 2020	$ 1,861
Unvested	824
Vested and exercisable	70
Options Outstanding at June 30, 2021	$ 894		$ 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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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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