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STOCK INCENTIVE PLANS - Stock Option Roll-forward (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Shares
Beginning balance (shares)	13,512,820	15,545,850
Options granted (shares)	962,080	1,638,020
Options exercised (shares)	(6,965,767)	(2,777,010)
Options cancelled/forfeited/expired (shares)	(315,940)	(894,040)
Ending balance (shares)	7,193,193	13,512,820
Options exercisable (shares)	7,001,403	13,222,800
Weighted average exercise price per share
Beginning balance (usd per share)	$ 0.78
Options granted (usd per share)	8.90	$ 2.11
Options exercised ( usd per share)	0.94	0.47
Options cancelled/forfeited/expired (usd per share)	1.61	2.57
Ending balance (usd per share)	1.87	0.78
Options exercisable (usd per share)	$ 1.81	$ 0.78
Weighted average remaining contractual life (in years)	6 years 5 months 12 days	6 years 4 months 6 days
Weighted average remaining contractual life, options exercisable (in years)	6 years 3 months 21 days	6 years 3 months 21 days

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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