FAIR VALUE MEASUREMENTS, Level 3 Fair Value Measurements of Warrant Liability (Details) - Warrants [Member]	Dec. 31, 2020 $ / shares	Sep. 30, 2020 $ / shares	Jun. 30, 2020 $ / shares	Mar. 31, 2020 $ / shares	Dec. 31, 2019 $ / shares	Nov. 26, 2019 $ / shares
Fair Value Measurements [Abstract]
Term	5 years	5 years	5 years	5 years	5 years	5 years
Exercise Price [Member]
Fair Value Measurements [Abstract]
Measurement input	11.50	11.50	11.50	11.50	11.50	11.50
Stock Price [Member]
Fair Value Measurements [Abstract]
Measurement input	10.26	10.19	9.96	9.70	9.78	9.78
Volatility [Member]
Fair Value Measurements [Abstract]
Measurement input	0.2660	0.1830	0.1720	0.1190	0.0870	0.122
Risk-free Rate [Member]
Fair Value Measurements [Abstract]
Measurement input	0.0042	0.0025	0.0027	0.0069	0.0170	0.0159
Dividend Yield [Member]
Fair Value Measurements [Abstract]
Measurement input	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000