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Stockholders' Equity and Equity Compensation Plans - Summary of Unvested Restricted Common Stock Activity (Details) - Restricted common stock - $ / shares shares in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Shares
Shares, Unvested awards, beginning balance	1,167	1,041
Shares, Awards granted	58	577
Shares, Awards forfeited/cancelled	(40)	(79)
Shares, Awards vested	(44)	(398)
Shares, Unvested awards, ending balance	1,141	1,141
Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Unvested awards, beginning balance	$ 43.95	$ 41.31
Weighted-Average Grant Date Fair Value, Awards granted	46.78	47.75
Weighted-Average Grant Date Fair Value, Awards forfeited/cancelled	44.76	43.37
Weighted-Average Grant Date Fair Value, Awards vested	39.02	41.40
Weighted-Average Grant Date Fair Value, Unvested awards, ending balance	$ 44.26	$ 44.26

X

- Definition

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

+ References

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)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Paragraph 2
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- Definition

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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- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Paragraph 2
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- Definition

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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-Publisher FASB
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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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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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