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Stock-based Compensation - Stock Option and Restricted Stock Unit Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shares
December 31, 2016	4,504,642
Granted	1,269,844
Options exercised or RSUs vested	(285,432)
Forfeited or expired	(215,090)
December 31, 2017	5,273,964	4,504,642
Exercisable	3,544,139
Vested and expected to vest	5,086,009
Weighted-Average Exercise Price
December 31, 2016	$ 19.79
Granted	27.18
Options exercised or RSUs vested	4.22
Forfeited or expired	24.43
December 31, 2017	22.23	$ 19.79
Exercisable	20.60
Vested and expected to vest	$ 22.10
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
Weighted-average remaining contractual term, Exercisable	5 years 10 months 24 days
Weighted-average remaining contractual term, Vested and expected to vest	6 years 8 months 12 days
Aggregate intrinsic value, Outstanding	$ 7,969
Aggregate intrinsic value, Exercisable	7,969
Aggregate intrinsic value, Vested and expected to vest	$ 7,969
Common stock, shares issued (in shares)	274,362	253,036	526,715
Cash proceeds from exercise of stock options	$ 900	$ 500	$ 1,900
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 17.90	$ 12.53	$ 15.17
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value	$ 5,200	$ 4,200	$ 10,800
Fair value of shares vested	16,400	$ 14,600	$ 11,600
Unrecognized compensation cost related to non-vested stock-based compensation arrangements	$ 24,200
Unrecognized compensation expense recognition period	2 years 7 months 6 days

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