Stock-Based Compensation (Stock Options Outstanding And Exercisable) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 4.98	$ 4.95
Options Outstanding	1,276,411	1,314,435
Options Exercisable	1,276,411	979,435
Stock Options [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 4.98	$ 4.95
Options Outstanding	1,276,411	1,314,435
Options Exercisable	1,276,411	979,435
Intrinsic Value of Options Outstanding	$ 5,298
Intrinsic Value of Options Exercisable	$ 5,298
Weighted-Average Life of Options Outstanding	6 years 10 months 24 days
Weighted-Average Life of Options Exercisable	6 years 10 months 24 days
Stock Options [Member] \| $0.93 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 0.93
Options Outstanding	5,161
Options Exercisable	5,161
Intrinsic Value of Options Outstanding	$ 42
Intrinsic Value of Options Exercisable	$ 42
Weighted-Average Life of Options Outstanding	10 months 24 days
Weighted-Average Life of Options Exercisable	10 months 24 days
Stock Options [Member] \| $2.30 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 2.30
Options Outstanding	25,000
Options Exercisable	25,000
Intrinsic Value of Options Outstanding	$ 171
Intrinsic Value of Options Exercisable	$ 171
Weighted-Average Life of Options Outstanding	2 years 4 months 24 days
Weighted-Average Life of Options Exercisable	2 years 4 months 24 days
Stock Options [Member] \| $5.05 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price	$ 5.05
Options Outstanding	1,246,250
Options Exercisable	1,246,250
Intrinsic Value of Options Outstanding	$ 5,085
Intrinsic Value of Options Exercisable	$ 5,085
Weighted-Average Life of Options Outstanding	7 years
Weighted-Average Life of Options Exercisable	7 years

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ References

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- Definition

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

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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