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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
	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)

X

- 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.

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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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X

- 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

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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

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