Employee withhold percentage of gross earnings.

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- Definition

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

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Price of a single share of a number of saleable stocks of a company.

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No definition available.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Purchase price of common stock expressed as a percentage of its fair value.

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Per share or per unit amount of equity securities issued.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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Stock-Based Compensation Expense - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended		9 Months Ended
	Sep. 15, 2020	Mar. 15, 2020	Sep. 13, 2019	Mar. 15, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 16, 2020	Mar. 13, 2020	Sep. 17, 2018	Mar. 16, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period							4 years
Share-based payment arrangement, expense					$ 17,128	$ 10,426	$ 46,921	$ 29,490
Purchase price of common stock by employees							85.00%
Issuance of common stock under employee stock purchase plan					3,736	$ 2,887	$ 7,082	$ 5,521
Shares to be issued under ESPP \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee withholding percentage							15.00%
2020 Bonus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense					500		$ 1,500
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense					131,200		$ 131,200
Unrecognized compensation expense, recognition period							2 years 6 months
Options to purchase common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, recognition period							7 months 6 days
Unrecognized compensation cost, stock options					$ 900		$ 900
Stock options vested, fair value							$ 1,800
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued to employees (in shares)	131,585	101,806	74,221	110,822
Issuance of common stock under employee stock purchase plan	$ 3,700	$ 3,300	$ 2,900	$ 2,600
Share issued, price per share (in dollars per share)	$ 28.39	$ 32.87	$ 42.22								$ 30.46	$ 21.96
Closing price of shares issued (in dollars per share)			$ 49.67						$ 33.40	$ 38.67	$ 35.84	$ 25.84