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FAIR VALUE MEASUREMENTS, Subsequent Measurement (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Sep. 17, 2020
Class of Warrant or Right [Line Items]        
Warrant liability $ 25,340,000 $ 23,530,000 $ 16,109,000 $ 16,290,000
Private Placement Warrants [Member]        
Class of Warrant or Right [Line Items]        
Warrant liability   $ 23,530,000