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FAIR VALUE MEASUREMENTS, Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring [Member] - USD ($)
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Nov. 26, 2019
Public Warrants [Member] | Level 1 [Member]            
Liabilities [Abstract]            
Warrant Liability $ 19,500,000 $ 16,950,000 $ 14,700,000 $ 8,100,000 $ 7,350,000 $ 10,950,000
Private Placement Warrants [Member] | Level 3 [Member]            
Liabilities [Abstract]            
Warrant Liability $ 17,200,000 $ 9,040,000 $ 7,840,000 $ 4,320,000 $ 3,920,000 $ 5,840,000