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Stock-Based Compensation - Schedule of Stock Options Roll Forward (Details) - Stock options	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding as of December 31, 2018 | shares	141,847
Exercised | shares	(15,319)
Outstanding as of June 30, 2019 | shares	126,528
Exercisable as of June 30, 2019 | shares	126,528
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, options outstanding, as of December 31, 2018 | $ / shares	$ 23.08
Weighted average exercise price, options exercised | $ / shares	10.78
Weighted average exercise price, options outstanding, as of June 30, 2019 | $ / shares	24.57
Weighted average exercise price, options exercisable, as of June 30, 2019 | $ / shares	$ 24.57

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
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- Definition

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

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