Stockholders' Equity And Stock-Based Compensation (Summary Of Stock Option Activity) (Details) - $ / shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Beginning Balance, Number of shares	2,598,659
Options granted, Number of shares	657,375
Options exercised, Number of shares	(144,508)
Options canceled, Number of shares	(147,839)
Options expired, Number of shares	(7,000)
Ending Balance, Number of shares	2,956,687	2,598,659
Exercisable, Number of shares	1,513,617
Beginning Balance, Weighted average exercise price per share	$ 16.88
Options granted, Weighted average exercise price per share	15.18
Options exercised, Weighted average exercise price per share	3.44
Options canceled, Weighted average exercise price per share	19.04
Options expired, Weighted average exercise price per share	19.99
Ending Balance, Weighted average exercise price per share	17.04	$ 16.88
Exercisable, Weighted average exercise price per share	$ 15.70
Weighted average remaining life	7 years 7 months 6 days	8 years 2 months 12 days
Weighted average remaining life, exercisable	6 years 7 months 6 days
$2.67 - $4.28 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercisable, Weighted average exercise price per share	$ 3.79
Weighted average remaining life	6 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.

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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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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.

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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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- Definition

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

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No definition available.

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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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- Definition

Weighted average remaining contractual term of exercisable stock options, 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.

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Number of share options (or share units) exercised during the current period.

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