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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Outstanding, Beginning Balance (in shares)	5,273,964		5,273,964
Shares, Granted (in shares)			1,796,645
Shares, Exercised (in shares)			(189,428)
Shares, Forfeited or expired (in shares)			(119,392)
Shares, Outstanding, Ending Balance (in shares)			6,761,789
Shares, Exercisable (in shares)			3,722,761
Shares, Vested and expected to vest (in shares)			6,461,922
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)	$ 22.23		$ 22.23
Weighted- Average Exercise Price, Granted (in dollars per share)			21.42
Weighted- Average Exercise Price, Exercised (in dollars per share)			3.25
Weighted- Average Exercise Price, Forfeited or expired (in dollars per share)			(23.74)
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share)			22.52
Weighted- Average Exercise Price, Exercisable (in dollars per share)			21.92
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share)			$ 22.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted- Average Remaining Contractual Term, Outstanding	6 years 9 months 18 days		7 years 3 months 18 days
Weighted- Average Remaining Contractual Term, Exercisable			5 years 10 months 24 days
Weighted- Average Remaining Contractual Term, Vested and expected to vest			7 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding, Ending Balance			$ 8,883
Aggregate Intrinsic Value, Exercisable			8,850
Aggregate Intrinsic Value, Vested and expected to vest			$ 8,880
Weighted-average grant-date fair value of options granted (in dollars per share)		$ 18.29	$ 14.38
Intrinsic value of options exercised		$ 3,700	$ 2,600
Cash received for options exercised		700	600
Fair value of shares vested		$ 6,300	6,500
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates			$ 38,700
Unrecognized compensation expense recognition period			2 years 10 months 24 days

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Unrecognized cost of unvested share-based compensation awards.

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