Stock-Based Compensation - Outstanding Stock Options (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 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	188,403
Forfeited (in shares) | shares	0
Exercised (in shares) | shares	(6,223)
Balance at the end of the period (in shares) | shares	2,873,239
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share) | $ / shares	$ 22.67
Granted (in dollars per share) | $ / shares	51.12
Forfeited (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	11.45
Balance at the end of the period (in dollars per share) | $ / shares	$ 24.56
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 8 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $	$ 54,796
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	1,981,650
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 13.52
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 4 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $	$ 52,408
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | shares	827,468
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares	$ 49.10
Options Expected To Vest Weighted Average Remaining Contractual Term	8 years 7 months 6 days
Options Expected To Vest Aggregate Intrinsic Value | $	$ 2,216
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 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $	$ 512
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 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $	$ 512