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FAIR VALUE MEASUREMENTS - Changes in the fair value of Level 3 warrant liabilities (Details) - Level 3 - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value as of December 31, 2020 |  | $ 21,912,800
Change in fair value |  | (1,685,600)
Transfer to Level 1 |  | (8,970,000)
Transfer to Level 2 |  | (6,682,000)
Public Warrants |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value as of December 31, 2020 |  | 12,558,000
Change in fair value |  | (3,588,000)
Transfer to Level 1 | $ (9,000,000.0) | (8,970,000)
Private Placement Warrants |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value as of December 31, 2020 |  | 9,354,800
Change in fair value |  | (2,672,800)
Transfer to Level 2 | $ (6,700,000) | $ (6,682,000)

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- Definition Amount of transfers of financial instrument classified as a liability into level 1 of the fair value hierarchy. + References No definition available. + Details
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- Definition Amount of transfers of financial instrument classified as a liability into level 2 of the fair value hierarchy. + References No definition available. + Details
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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. + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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