Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock option activity
Balance at the beginning of the period (in shares)	206,524	417,581	472,156
Exercised (in shares)	(134,930)	(211,057)	(54,575)
Balance at the end of the period (in shares)	71,594	206,524	417,581
Vested and Expected to Vest (in shares)	71,594
Exercisable at the end of the period (in shares)	71,594
Weighted average exercise price
Balance at the beginning of the period (in dollars per share)	$ 48.88	$ 31.58	$ 30.41
Exercised (in dollars per share)	35.26	14.65	21.45
Balance at the end of the period (in dollars per share)	74.54	$ 48.88	$ 31.58
Vested and Expected to Vest (in dollars per share)	74.54
Exercisable at the end of the period (in dollars per share)	$ 74.54
Weighted average remaining contractual life
Outstanding at the beginning of period	4 years 7 months 9 days
Vested and Expected to Vest	4 years 7 months 9 days
Exercisable at the end of period	4 years 7 months 9 days
Aggregate intrinsic value
Outstanding at the end of the period	$ 1,823
Vested and Expected to Vest	1,823
Exercisable at the end of the period	$ 1,823