Stock Plans and Stock-Based Compensation - Stock Options - Additional Information (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 33,489,000	$ 25,825,000	$ 9,299,000
Intrinsic value of options exercised	48,200,000	25,700,000	9,100,000
Intrinsic value of all outstanding options	37,300,000	59,900,000	32,100,000
Total unrecognized compensation cost	6,600,000
Proceeds from option exercises	$ 17,411,000	$ 10,150,000	$ 2,869,000
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
Weighted-average grant-date fair value per share of options granted		$ 35.00	$ 22.84
Stock-based compensation expense	$ 5,700,000	$ 7,700,000	$ 5,300,000
Stock options granted	0
Excess tax benefits realized from stock options exercised	$ 0	$ 0	$ 0
Weighted-average amortization period	1 year 10 months 24 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 of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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