Stock Plans and Stock-Based Compensation - Restricted Stock Units - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 12,685	$ 10,310
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, number of stock unit grants in period	29,366
Stock-based compensation expense	$ 5,900	$ 4,500
Number of stock units vested	57,409
Weighted-average grant date fair values of units granted	$ 132.34	$ 96.85
Fair values of stock units	$ 4,000	$ 2,200
Unrecognized compensation expense	$ 47,100
Weighted-average amortization period	2 years 3 months 7 days

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

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