Stock Plans and Stock-Based Compensation - Restricted Stock Units - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 46,755	$ 33,489	$ 25,825
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, number of stock unit grants in period	346,912
Stock-based compensation expense	$ 20,100	$ 16,300	$ 5,400
Number of stock units vested	315,111
Weighted-average grant date fair values of units granted	$ 122.82	$ 80.16	$ 52.11
Fair values of stock units	$ 18,200	$ 11,900	$ 3,100
Unrecognized compensation expense	$ 50,700
Weighted-average amortization period	2 years 4 months 24 days

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

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