Stockholders' Equity - Summary of Nonvested Shares (Details) - Restricted Stock Units (RSUs) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
Jun. 30, 2020 USD ($) $ / shares shares
Number of Shares Underlying RSUs
Unvested as of December 31, 2019 \| shares	696
Granted \| shares	289
Vested and released \| shares	(288)
Forfeited \| shares	(22)
Unvested as of June 30, 2020 \| shares	675
Weighted Average Grant Date Fair Value
Unvested as of December 31, 2019 \| $ / shares	$ 190.60
Granted \| $ / shares	264.97
Vested and released \| $ / shares	149.86
Forfeited \| $ / shares	231.28
Unvested as of June 30, 2020 \| $ / shares	$ 238.47
Weighted Average Remaining Contractual Term (in years)
Weighted average remaining contractual term	1 year 7 months 6 days
Aggregate Intrinsic Value
Aggregate intrinsic value \| $	$ 185,207

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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