Stock Plans and Stock-Based Compensation - Stock Options - Additional Information (Details) - USD ($) $ 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
Intrinsic value of options exercised			12,200	26,100
Intrinsic value of all outstanding options	21,200	42,800	21,200	42,800
Total unrecognized compensation cost	200		200
Proceeds from stock option exercises			$ 2,947	$ 6,764
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	$ 200	$ 900	$ 1,000	$ 2,800
Weighted-average amortization period			6 months

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

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Amount of cost to be recognized for option under share-based payment arrangement.

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