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FAIR VALUE MEASUREMENTS - Fair value hierarchy for liabilities (Details)
Dec. 31, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total warrant liabilities $ 33,660,000
Public Warrants  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total warrant liabilities 18,975,000
Private Placement Warrants  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total warrant liabilities 14,685,000
Level 1  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total warrant liabilities 18,975,000
Level 1 | Public Warrants  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total warrant liabilities 18,975,000
Level 2  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total warrant liabilities 0
Level 3  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total warrant liabilities 14,685,000
Level 3 | Private Placement Warrants  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total warrant liabilities $ 14,685,000