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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. 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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Number of fully vested and expected to vest exercisable options that may 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 exercisable or convertible options. 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 that were terminated.

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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 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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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. 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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Number of share options (or share units) exercised during the current period.

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STOCK-BASED COMPENSATION - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Number of Options Outstanding
Options outstanding, beginning of period (in shares)		11,065,658
Options granted (in shares)		1,043,948	2,440,000
Options exercised (in shares)	(1,440,026)	(2,842,564)
Options forfeited (in shares)		(101,141)
Options outstanding, end of period (in shares)	9,165,901	9,165,901		11,065,658
Options vested and exercisable (in shares)	6,133,879	6,133,879
Weighted- Average Exercise Price Per Share
Options outstanding, weighted average exercise price (in dollars per share)	$ 2.32	$ 2.32		$ 2.61
Options granted, weighted average exercise price (in dollars per share)		28.80
Options exercised, weighted average exercise price (in dollars per share)	1.48	1.72
Options forfeited, weighted average exercise price (in dollars per share)		14.03
Options vested and exercisable, weighted-average exercise price (in dollars per share)	$ 2.32	$ 2.32
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual life, options outstanding		7 years 1 month 6 days		7 years 2 months 12 days
Weighted average remaining contractual life, options vested and exercisable		6 years 2 months 12 days
Aggregate intrinsic value, options outstanding	$ 171,226	$ 171,226		$ 46,516
Aggregate intrinsic value, options vested and exercisable	$ 132,327	$ 132,327
Previously Reported
Number of Options Outstanding
Options outstanding, beginning of period (in shares)		51,379,939
Options outstanding, end of period (in shares)				51,379,939
Weighted- Average Exercise Price Per Share
Options outstanding, weighted average exercise price (in dollars per share)				$ 0.56
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual life, options outstanding				7 years 2 months 12 days
Aggregate intrinsic value, options outstanding				$ 46,516
Retroactive application of recapitalization
Number of Options Outstanding
Options outstanding, beginning of period (in shares)		(40,314,281)
Options outstanding, end of period (in shares)				(40,314,281)
Weighted- Average Exercise Price Per Share
Options outstanding, weighted average exercise price (in dollars per share)				$ 2.05