Stock Plans and Stock-Based Compensation - Stock Options - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 15,505	$ 11,278	$ 28,190	$ 21,588
Intrinsic value of options exercised			8,600	15,400
Intrinsic value of all outstanding options	22,200	59,400	22,200	59,400
Total unrecognized compensation cost	500		500
Proceeds from stock option exercises			$ 2,163	$ 4,585
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	$ 400	$ 1,000	$ 800	$ 1,900
Weighted-average amortization period			7 months 6 days

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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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