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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 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)	1,230,244
Shares, Exercised (in shares)	(205,902)
Shares, Forfeited or expired (in shares)	(180,709)
Shares, Outstanding, Ending Balance (in shares)	5,348,275	4,504,642
Shares, Exercisable (in shares)	3,365,982
Shares, Vested and expected to vest (in shares)	5,138,801
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)	27.43
Weighted- Average Exercise Price, Exercised (in dollars per share)	5.47
Weighted- Average Exercise Price, Forfeited or expired (in dollars per share)	(24.25)
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share)	21.95	$ 19.79
Weighted- Average Exercise Price, Exercisable (in dollars per share)	19.70
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share)	$ 21.79
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted- Average Remaining Contractual Term, Outstanding	7 years	7 years
Weighted- Average Remaining Contractual Term, Exercisable	6 years
Weighted- Average Remaining Contractual Term, Vested and expected to vest	7 years
Aggregate Intrinsic Value, Outstanding, Ending Balance	$ 19,762
Aggregate Intrinsic Value, Exercisable	18,892
Aggregate Intrinsic Value, Vested and expected to vest	$ 19,671
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 18.07
Intrinsic value of options exercised	$ 4,000
Cash received for options exercised	900
Fair value of shares vested	11,900
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates	$ 28,000
Unrecognized compensation expense recognition period	2 years 7 months 24 days

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Unrecognized cost of unvested share-based compensation awards.

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