STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - Stock options - $ / shares	6 Months Ended
Jun. 30, 2022
Options to purchase shares of common stock activity
Outstanding at December 31, 2021	44,940,169
Exercised	(5,543,336)
Forfeited	(1,559,308)
Outstanding at March 31, 2022	37,837,525
Exercisable at March 31, 2022	28,931,045
Weighted average exercise price	$ 4.36

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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- 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.

+ References

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

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

+ References

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- Definition

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

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