Stock Plans and Stock-Based Compensation - Restricted Stock Units - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 17,441	$ 13,351	$ 45,631	$ 34,939
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, number of stock unit grants in period			317,841
Stock-based compensation expense	8,700	$ 5,800	$ 22,000	$ 15,100
Number of stock units vested			248,689
Weighted-average grant date fair values of units granted			$ 124.17	$ 120.09
Fair values of stock units			$ 20,800	$ 17,800
Unrecognized compensation expense	$ 59,300		$ 59,300
Weighted-average amortization period			2 years 4 months 2 days

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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