Stock-Based Compensation - Outstanding Stock Options (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares
Stock Options
Number of Stock Options
Balance at the beginning of the period (in shares) | shares	2,691,059
Granted (in shares) | shares	253,403
Forfeited (in shares) | shares	(9,874)
Exercised (in shares) | shares	(36,926)
Balance at the end of the period (in shares) | shares	2,897,662
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share) | $ / shares	$ 22.67
Granted (in dollars per share) | $ / shares	47.93
Forfeited (in dollars per share) | $ / shares	55.59
Exercised (in dollars per share) | $ / shares	23.31
Balance at the end of the period (in dollars per share) | $ / shares	$ 24.76
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $	$ 69,702
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	1,992,447
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 13.69
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 2 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $	$ 65,132
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | shares	840,114
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares	$ 49.12
Options Expected To Vest Weighted Average Remaining Contractual Term	8 years 6 months
Options Expected To Vest Aggregate Intrinsic Value | $	$ 4,242
Performance Stock Options
Number of Stock Options
Balance at the beginning of the period (in shares) | shares	30,000
Granted (in shares) | shares	0
Forfeited (in shares) | shares	0
Exercised (in shares) | shares	0
Balance at the end of the period (in shares) | shares	30,000
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share) | $ / shares	$ 21.45
Granted (in dollars per share) | $ / shares	0
Forfeited (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	0
Balance at the end of the period (in dollars per share) | $ / shares	$ 21.45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $	$ 712
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	30,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 21.45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	6 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $	$ 712