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Stock-Based Compensation - Summary of RSU Activity (Details) - RSUs shares in Thousands	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Number of Share Units
Share Units, Outstanding as of December 31,2020 | shares	4,061
Share Units, Granted | shares	1,554
Share Units, Vested and delivered | shares	(1,493)
Share Units, Forfeited | shares	(201)
Share Units, Outstanding as of June 30, 2021 | shares	3,921	[1]
Weighted- Average Grant Date Fair Value
Weighted- Average Grant Date Fair Value, Outstanding as of December 31, 2020 | $ / shares	$ 8.31
Weighted-Average Grant Date Fair Value, Granted | $ / shares	15.02
Weighted-Average Grant Date Fair Value, Vested and delivered | $ / shares	8.36
Weighted- Average Grant Date Fair Value, Forfeited | $ / shares	9.13
Weighted- Average Grant Date Fair Value, Outstanding as of June 30, 2021 | $ / shares	$ 10.91	[1]
[1] Included in “Outstanding as of June 30, 2021” are 64 RSUs that were vested, but not yet delivered.

X

- Definition

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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