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FAIR VALUE MEASUREMENTS, Level 3 Fair Value Measurement Inputs (Details) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Fair Value Measurements [Abstract] |  |
Expected life of the options to convert | 5 years |
Private Placement Warrants [Member] |  |
Fair Value Measurements [Abstract] |  |
Expected life of the options to convert | 5 years 6 months 29 days | 5 years 11 months 12 days
Private Placement Warrants [Member] | Common Stock Price [Member] |  |
Fair Value Measurements [Abstract] |  |
Measurement input | 10.13 | 9.77
Private Placement Warrants [Member] | Volatility [Member] |  |
Fair Value Measurements [Abstract] |  |
Measurement input | 0.1050 | 0.2259
Private Placement Warrants [Member] | Risk-Free Rate [Member] |  |
Fair Value Measurements [Abstract] |  |
Measurement input | 0.0108 | 0.0050
Private Placement Warrants [Member] | Dividend Yield [Member] |  |
Fair Value Measurements [Abstract] |  |
Measurement input | 0 | 0
FPA liability - Committed [Member] |  |
Fair Value Measurements [Abstract] |  |
Expected life of the options to convert | 6 months 29 days | 11 months 12 days
FPA liability - Committed [Member] | Common Stock Price [Member] |  |
Fair Value Measurements [Abstract] |  |
Measurement input | 10.13 | 9.77
FPA liability - Committed [Member] | Risk-Free Rate [Member] |  |
Fair Value Measurements [Abstract] |  |
Measurement input | 0.0006 | 0.0010
FPA liability - Optional [Member] |  |
Fair Value Measurements [Abstract] |  |
Expected life of the options to convert | 6 months 29 days | 11 months 12 days
FPA liability - Optional [Member] | Common Stock Price [Member] |  |
Fair Value Measurements [Abstract] |  |
Measurement input | 10.13 | 9.77
FPA liability - Optional [Member] | Volatility [Member] |  |
Fair Value Measurements [Abstract] |  |
Measurement input | 0.10 | 0.10
FPA liability - Optional [Member] | Risk-Free Rate [Member] |  |
Fair Value Measurements [Abstract] |  |
Measurement input | 0.0006 | 0.0010

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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + 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 (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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