FAIR VALUE MEASUREMENTS, Level 3 Fair Value Measurement Inputs (Details)	Sep. 30, 2021	Dec. 31, 2020
Fair Value Measurements [Abstract]
Time until Business Combination occurring (years)	5 years
Warrant [Member]
Fair Value Measurements [Abstract]
Time until Business Combination occurring (years)	3 months 10 days	7 months 28 days
Warrant [Member] | Stock Price [Member]
Fair Value Measurements [Abstract]
Measurement input	9.79	10.35
Warrant [Member] | Strike Price [Member]
Fair Value Measurements [Abstract]
Measurement input	11.50	11.50
Warrant [Member] | Volatility [Member]
Fair Value Measurements [Abstract]
Measurement input	0.138	0.100
Warrant [Member] | Risk-free Rate [Member]
Fair Value Measurements [Abstract]
Measurement input	0.0103	0.0046
Warrant [Member] | Dividend Yield [Member]
Fair Value Measurements [Abstract]
Measurement input	0.0000	0.000