Stock Plans and Stock-Based Compensation - Restricted Stock Units - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 10,310	$ 7,785
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, number of stock unit grants in period	81,845
Stock-based compensation expense	$ 4,500	$ 3,800
Number of stock units vested	44,606
Weighted-average grant date fair values of units granted	$ 96.85	$ 57.81
Fair values of stock units	$ 2,200	$ 600
Unrecognized compensation expense	$ 37,300
Weighted-average amortization period	2 years 6 months 25 days

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

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