Stock-Based Compensation - Summary of Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2019 $ / shares shares
Number of Stock Options
Outstanding at the beginning of period (in shares) | shares	3,820
Granted (in shares) | shares	926
Exercised (in shares) | shares	(913)
Canceled or forfeited (in shares) | shares	(153)
Outstanding at the end of the period (in shares) | shares	3,680	3,820
Exercisable at the end of the period (in shares) | shares	1,882
Weighted- Average Exercise Price Per Share
Outstanding at the beginning of period (in usd per share) | $ / shares	$ 36.26
Granted (in usd per share) | $ / shares	58.36
Exercised (in usd per share) | $ / shares	30.77
Canceled or forfeited (in usd per share) | $ / shares	42.20
Outstanding at the end of the period (in usd per share) | $ / shares	42.94	$ 36.26
Exercisable at the end of the period (in usd per share) | $ / shares	$ 36.53
Weighted- Average Contractual Life (in years)
Outstanding at the beginning of the period	7 years 5 months 23 days	6 years 9 months 21 days
Outstanding at the end of the period	7 years 5 months 23 days	6 years 9 months 21 days
Exercisable at the end of the period	6 years 2 months 4 days
Aggregate Intrinsic Value
Outstanding at the end of the period | $	$ 192,690
Exercisable at the end of the period | $	110,552
Aggregate intrinsic value of options exercised | $	53,500
Unrecognized compensation expense | $	$ 43,700
Weighted-average period for recognition	2 years 8 months 19 days