Stock-Based Compensation - Schedule of Stock-Based Compensation Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding beginning balance (in shares) | shares	3,392
Granted (in shares) | shares	889
Exercised (in shares) | shares	(434)
Canceled/Forfeited (in shares) | shares	(103)
Outstanding ending balance (in shares) | shares	3,744
Exercisable at end of period (in shares) | shares	2,415
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding weighted average exercise price, beginning balance (in usd per share) | $ / shares	$ 14.41
Granted weighted average exercise price (in usd per share) | $ / shares	43.19
Exercised weighted average exercise price (in usd per share) | $ / shares	16.84
Canceled/Forfeited weighted average exercise price (in usd per share) | $ / shares	24.16
Outstanding weighted average exercise price, ending balance (in usd per share) | $ / shares	20.69
Exercisable weighted average exercise price at end of period (in usd per share) | $ / shares	$ 16.66
Outstanding, weighted average remaining term at end of period	6 years 10 months 24 days
Exercisable, weighted average remaining term at end of period	6 years
Outstanding, intrinsic value at end of period | $	$ 64,906
Exercisable, intrinsic value at end of period | $	$ 48,735