Stockholders’ Equity and Stock-Based Compensation - RSU Activity (Details) - (RSUs) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Number of Shares
Unvested beginning balance (in shares)	1,816
Shares granted (in shares)	176
RSUs vested (in shares)	(139)
RSUs forfeited/canceled (in shares)	(46)
Unvested ending balance (in shares)	1,807	1,816
Weighted- Average Grant Date Fair Value Per Share
Unvested beginning balance (in dollars per share)	$ 215.68
RSUs granted (in dollars per share)	310.32
Vested (in dollars per share)	199.41
RSUs forfeited/canceled (in dollars per share)	225.87
Unvested ending balance (in dollars per share)	$ 225.88	$ 215.68
Unvested, weighted average remaining contractual term (in years)	1 year 8 months 12 days	1 year 9 months 18 days
Unvested, aggregate intrinsic value	$ 545,194	$ 527,574

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- Definition

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.

+ References

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-Publisher FASB
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-Topic 718
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-Paragraph 2
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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).

+ References

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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).

+ References

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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.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

+ References

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-Publisher FASB
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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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-Publisher FASB
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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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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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-Publisher FASB
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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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No definition available.

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