Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Number of Stock Options
Outstanding at the beginning of period (in shares)	3,820
Granted (in shares)	835
Exercised (in shares)	(296)
Canceled or forfeited (in shares)	(127)
Outstanding at the end of the period (in shares)	4,232	3,820
Exercisable at the end of the period (in shares)	2,328
Weighted- Average Exercise Price Per Share
Outstanding at the beginning of period (in usd per share)	$ 36.26
Granted (in usd per share)	54.55
Exercised (in usd per share)	28.69
Canceled or forfeited (in usd per share)	41.03
Outstanding at the end of the period (in usd per share)	40.25	$ 36.26
Exercisable at the end of the period (in usd per share)	$ 34.86
Weighted- Average Contractual Life (in years)
Outstanding at the beginning of the period	7 years 25 days	6 years 9 months 21 days
Outstanding at the end of the period	7 years 25 days	6 years 9 months 21 days
Exercisable at the end of the period	5 years 5 months 23 days
Aggregate Intrinsic Value
Outstanding at the end of the period	$ 210,031
Exercisable at the end of the period	128,039
Aggregate intrinsic value of options exercised	15,000
Unrecognized compensation expense	$ 44,600
Weighted-average period for recognition	2 years 10 months 2 days