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Stock-Based Compensation - Restricted Common Stock and Common Stock Units Activity (Details) - Restricted Common Stock Units	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Number of Shares/Units
Outstanding, non-vested at beginning of period (in shares) | shares	1,177,249
Issued (in shares) | shares	1,478,093
Vested (in shares) | shares	(247,349)
Cancelled/forfeited (in shares) | shares	(215,033)
Outstanding, non-vested at end of period (in shares) | shares	2,192,960
Weighted-Average Grant Date per Share/Unit
Outstanding, non-vested at beginning of period (usd per share) | $ / shares	$ 19.01
Issued (usd per share) | $ / shares	37.37
Vested (usd per share) | $ / shares	20.28
Cancelled/forfeited (usd per share) | $ / shares	23.64
Outstanding, non-vested at end of period (usd per share) | $ / shares	$ 30.85

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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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.

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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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- 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.

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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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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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