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Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Stock Options Outstanding
Stock Options Outstanding, Beginning of year	4,375,929
Stock Options Outstanding, Exercised	(813,228)
Stock Options Outstanding, Cancelled	(117,635)
Stock Options Outstanding, Expired	(20,311)
Stock Options Outstanding, End of year	3,424,755	4,375,929
Stock Options Outstanding, Exercisable	2,193,274
Weighted Average Remaining Term, Outstanding	7 years 4 months 24 days	7 years 10 months 24 days
Weighted Average Remaining Term, Exercisable	7 years 2 months 12 days
Weighted-Average Exercise Price
Weighted-Average Exercise Price, beginning of year	$ 10.73
Weighted Average Exercise Price, Exercised	7.38
Weighted Average Exercise Price, Cancelled	12.15
Weighted Average Exercise Price, Expired	7.34
Weighted-Average Exercise Price, end of year	11.49	$ 10.73
Weighted Average Exercise Price, Exercisable	$ 10.63
Aggregate Intrinsic Value, Outstanding	$ 17,603
Aggregate Intrinsic Value, Exercisable	$ 12,811

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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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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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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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 for option awards outstanding, 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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