Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS - Changes in the fair value of warrant liabilities (Details)

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FAIR VALUE MEASUREMENTS - Changes in the fair value of warrant liabilities (Details) - USD ($)
 7 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value as of beginning   $ 16,116,667
Initial measurement on September 17, 2019 (IPO) $ 18,300,000  
Change in valuation inputs or other assumptions (2,183,333) 20,650,000
Fair value as of ending 16,116,667 36,766,667
Public Warrants    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value as of beginning   9,716,667
Initial measurement on September 17, 2019 (IPO) 11,000,000  
Change in valuation inputs or other assumptions (1,283,333) 12,650,000
Fair value as of ending 9,716,667 22,366,667
Private Placement Warrants    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value as of beginning   6,400,000
Initial measurement on September 17, 2019 (IPO) 7,300,000  
Change in valuation inputs or other assumptions (900,000) 8,000,000
Fair value as of ending $ 6,400,000 $ 14,400,000