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FAIR VALUE MEASUREMENTS, Roll Forward of Level 1 Instruments (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Warrant Liability [Abstract]        
Fair value adjustment $ 1,079,474 $ (25,075) $ 817,506 $ (382,680)
Recurring [Member] | Level 1 [Member]        
Warrant Liability [Abstract]        
Balance, beginning of period     773,956  
Fair value adjustment     (773,956)  
Balance, end of period $ 0   $ 0