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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

The following table summarizes stock option activity:

						Weighted-
						Average								Aggregate
		Stock				Remaining				Weighted-				Intrinsic
		Options				Term				Average				Value
		Outstanding				(in years)				Exercise Price				(in thousands)
Outstanding at January 1, 2017			3,402,481				7.9			$	9.02
Granted			1,124,542							$	15.88
Exercised			(22,989	)						$	7.36
Cancelled			(128,105	)						$	11.36
Outstanding at December 31, 2017			4,375,929				7.4			$	10.73			$	95,937
Vested at December 31, 2017			1,851,799				6.5			$	7.99			$	45,705
Exercisable at December 31, 2017			388,040				0.8			$	4.33			$	10,989

Schedule of Assumptions Used to Estimate the Fair Value of Stock Options Granted

The following assumptions were used to estimate the fair value of stock options granted:

	Year Ended December 31,
	2017				2016				2015
Expected dividend yield		—				—				—
Risk-free interest rate	2.21 – 2.47%				1.43 – 2.40%				2.18 – 2.36%
Expected term (in years)		10				10				10
Expected volatility	29.07 – 34.43%				24.03 – 26.95%				27.24 – 27.60%

Summary of RSU

The following table summarizes RSU activity:

										Total
		Restricted				Weighted				Fair Value
		Stock				Average				of Shares
		Units				Grant Date				Vested
		Outstanding				Fair Value				(in thousands)
Outstanding at January 1, 2016			—				—
Granted			141,296			$	12.57
Outstanding at December 31, 2016			141,296			$	12.57
Granted			62,791			$	27.87
Vested			(111,660	)		$	12.57			$	2,556
Cancelled			(29,636	)		$	12.57
Outstanding at December 31, 2017			62,791			$	27.87

Summary of Share-based Compensation Costs by Award Type

The following table summarizes share-based compensation costs by award type:

		Year Ended December 31,
(In thousands)		2017				2016				2015
Stock options		$	5,135			$	3,717			$	809
Restricted stock units			3,619				161				—
Total share-based compensation costs		$	8,754			$	3,878			$	809

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Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ 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 (c)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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