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Stock-Based Compensation (Stock Option Activity) (Details) - Stock options $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Number Outstanding [Roll Forward]
Outstanding at December 31, 2019 | shares	4,417,693
Granted | shares	1,437,188
Exercised | shares	(683,718)
Forfeited | shares	(208,278)
Outstanding at December 31, 2020 | shares	4,962,885
Weighted Average Exercise Price [Roll Forward]
Outstanding at December 31, 2019 | $ / shares	$ 9.32
Granted | $ / shares	8.25
Exercised | $ / shares	6.49
Forfeited | $ / shares	9.43
Outstanding at December 31, 2020 | $ / shares	$ 9.40
Outstanding at December 31, 2020, Weighted Average Remaining Contractual Term	5 years
Outstanding at December 31, 2020, Aggregate Intrinsic Value | $	$ 1.7
Exercisable shares at December 31, 2020 | shares	2,564,242
Exercisable shares at December 31, 2020, Weighted Average Exercise Price | $ / shares	$ 9.84
Exercisable shares at December 31, 2020, Weighted Average Contractual Term	2 years 8 months 12 days
Exercisable shares at December 31, 2020, Aggregate Intrinsic Value | $	$ 1.4

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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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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.

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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 option holders acquired shares when converting their stock options into shares.

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

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