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FAIR VALUE OF MEASUREMENTS AND INVESTMENT SECURITIES - Fair Value of Warrants (Details) - Warrant Derivative Liability - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
Gain on change in the fair value $ 2.8  
Risk-free interest rate 1.22% 0.46%
Volatility 94.00% 90.00%
Expected life (years) 4 years 7 months 20 days 5 years 7 months 20 days