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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Outstanding, Beginning Balance (in shares)	4,504,642
Shares, Granted (in shares)	1,163,517
Shares, Exercised (in shares)	(185,773)
Shares, Forfeited or expired (in shares)	(114,632)
Shares, Outstanding, Ending Balance (in shares)	5,367,754	4,504,642
Shares, Exercisable (in shares)	3,108,933
Shares, Vested and expected to vest (in shares)	5,141,748
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted- Average Exercise Price, Outstanding, Beginning Balance (in dollars per share)	$ 19.79
Weighted- Average Exercise Price, Granted (in dollars per share)	27.78
Weighted- Average Exercise Price, Exercised (in dollars per share)	5.35
Weighted- Average Exercise Price, Forfeited or expired (in dollars per share)	(23.50)
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share)	21.94	$ 19.79
Weighted- Average Exercise Price, Exercisable (in dollars per share)	18.99
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share)	$ 21.75
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted- Average Remaining Contractual Term, Outstanding	7 years 2 months 12 days	7 years
Weighted- Average Remaining Contractual Term, Exercisable	5 years 10 months 24 days
Weighted- Average Remaining Contractual Term, Vested and expected to vest	7 years 1 month 6 days
Aggregate Intrinsic Value, Outstanding, Ending Balance	$ 18,118
Aggregate Intrinsic Value, Exercisable	17,733
Aggregate Intrinsic Value, Vested and expected to vest	$ 18,081
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 18.29
Intrinsic value of options exercised	$ 3,700
Cash received for options exercised	700
Fair value of shares vested	6,300
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates	$ 31,700
Unrecognized compensation expense recognition period	2 years 9 months 18 days

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Unrecognized cost of unvested share-based compensation awards.

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