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Stock-Based Compensation - Restricted Stock (Details) - Restricted stock awards	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Awards
Unvested balance, beginning of period (in shares) | shares	12,093,723
Granted (in shares) | shares	0
Vested (in shares) | shares	(504,052)
Forfeited (in shares) | shares	(8,228)
Unvested balance, end of period (in shares) | shares	11,581,443
Weighted Average Grant-Date Fair Value
Beginning of period (in dollars per share) | $ / shares	$ 2.33
Granted (in dollars per share) | $ / shares	0
Vested (in dollars per share) | $ / shares	5.39
Forfeited (in dollar per share) | $ / shares	8.57
End of period (in dollars per share) | $ / shares	$ 2.19
Officer and employees
Weighted Average Grant-Date Fair Value
Vesting period	3 years
Director
Weighted Average Grant-Date Fair Value
Vesting period	1 year

X

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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 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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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 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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