Stock Plans and Stock-Based Compensation - Stock Options - Additional Information (Details) - USD ($) $ 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
Intrinsic value of options exercised	9,200	22,200
Intrinsic value of all outstanding options	47,100	62,200
Total unrecognized compensation cost	5,700
Proceeds from stock option exercises	$ 2,989	$ 8,746
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options vesting period	4 years
Stock options expiration period	10 years
Stock options granted	0	0
Stock-based compensation expense	$ 900	$ 1,900
Weighted-average amortization period	1 year 8 months 12 days

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

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