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Stockholders' Equity (Stock Option Activity) (Details) - Employee Stock Option [Member] - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of options
Beginning balance (in shares)	573,925
Issued (in shares)	104,458
Exercised (in shares)	0	0	0
Expired (in shares)	(20,969)
Ending balance (in shares)	657,414	573,925
Exercisable (in shares)	598,139
Weighted average exercise price
Beginning balance (in dollars per share)	$ 4.94
Issued (in dollars per share)	1.99
Expired (in dollars per share)	11.04
Ending balance (in dollars per share)	4.28	$ 4.94
Exercisable (in dollars per share)	$ 4.51

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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

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Number of options outstanding, including both vested and non-vested options.

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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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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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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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