FAIR VALUE MEASUREMENTS, Level 3 Fair Value Measurements of Warrant Liability (Details) - Warrants [Member]	Sep. 30, 2021 $ / shares	Dec. 31, 2020 $ / shares
Fair Value Measurements [Abstract]
Term	5 years	5 years
Exercise Price [Member]
Fair Value Measurements [Abstract]
Measurement Input	11.50	11.50
Stock price [Member]
Fair Value Measurements [Abstract]
Measurement Input	10.02	10.26
Volatility [Member]
Fair Value Measurements [Abstract]
Measurement Input	0.132	0.266
Risk-free rate [Member]
Fair Value Measurements [Abstract]
Measurement Input	0.0067	0.0042
Dividend yield [Member]
Fair Value Measurements [Abstract]
Measurement Input	0.000	0.000