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STOCK-BASED COMPENSATION - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Number of Options Outstanding |  |  |
Options outstanding, beginning of period (in shares) | 11,065,658 |  |
Options granted (in shares) | 709,448 | 2,354,515 |
Options exercised (in shares) | (1,402,538) |  |
Options forfeited (in shares) | (15,435) |  |
Options outstanding, end of period (in shares) | 10,357,133 |  | 11,065,658
Options vested and exercisable (in shares) | 7,273,421 |  |
Weighted- Average Exercise Price Per Share |  |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 4.27 |  | $ 2.61
Options granted, weighted average exercise price (in dollars per share) | 25.53 |  |
Options exercised, weighted average exercise price (in dollars per share) | 1.97 |  |
Options forfeited, weighted average exercise price (in dollars per share) | 2.25 |  |
Options vested and exercisable, weighted-average exercise price (in dollars per share) | $ 2.15 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Weighted average remaining contractual life, options outstanding | 7 years |  | 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 | $ 328,644 |  | $ 46,516
Aggregate intrinsic value, options vested and exercisable | $ 247,154 |  |
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

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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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