FAIR VALUE MEASUREMENTS - key inputs into the binomial lattice simulation model for the Private Placement Warrants and Public Warrants at initial measurement (Details) - Level 3	Sep. 30, 2021 $ / shares D	Dec. 31, 2020 $ / shares D
Risk-free interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.87	0.38
Trading days per year
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input | D	252	252
Expected volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	13.0	22.4
Exercise price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	11.50	11.50
Stock Price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	9.90	10.19