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Equity-Based Compensation - activity (Details) - $ / shares shares in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Number of Units
Outstanding, beginning	88,878	74,824
Granted	1,201	19,362
Exercised	(2,928)	(3,483)	(105)
Forfeited	(92)	(653)
Expired	(59)	(1,172)
Outstanding, ending	87,000	88,878	74,824
Exercisable	73,817	75,506
Exercise Price
Weighted average, beginning	$ 0.63	$ 0.49
Granted (per unit)	1.65	1.11
Exercised (per unit)	0.16	0.21
Forfeitures (in units)	1.23	0.99
Expired (in units)	0.50	0.45
Weighted average, ending	0.66	0.63	$ 0.49
Exercisable (in units)	$ 0.57	$ 0.55

X

- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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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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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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