General form of registration statement for all companies including face-amount certificate companies

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

v3.21.1
FAIR VALUE MEASUREMENTS - Changes in the fair value of warrant liabilities (Details) - USD ($)
 3 Months Ended 4 Months Ended 6 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Fair value as of beginning $ 36,766,667 $ 16,116,667   $ 16,116,667   $ 16,116,667 $ 16,116,667  
Change in fair value of warrant liabilities (850,001) 5,125,000 $ (333,333) 2,616,667 $ 2,183,333 (2,408,333) (20,650,000) $ 2,218,333
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 37,616,668       16,116,667   36,766,667 16,116,667
Public Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Fair value as of beginning 22,366,667 9,716,667   9,716,667   9,716,667 9,716,667  
Change in fair value of warrant liabilities (550,001)              
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 22,916,668       9,716,667   22,366,667 9,716,667
Private Placement Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Fair value as of beginning 14,400,000 $ 6,400,000   $ 6,400,000   $ 6,400,000 6,400,000  
Change in fair value of warrant liabilities (300,000)              
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 $ 14,700,000       $ 6,400,000   $ 14,400,000 $ 6,400,000