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FAIR VALUE MEASUREMENTS - Summary summary of the changes in the fair value of the FPA liability (Details) - FPA liability
6 Months Ended
Dec. 31, 2020
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair value, June 19, 2020 $ 255,538
Loss on change in fair value (1) 10,399,002
Fair value, December 31, 2020 $ 10,654,540