WARRANT LIABILITY AND FAIR VALUE MEASUREMENTS - Valuation Methodology (Details) - $ / shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
WARRANT LIABILITY AND FAIR VALUE MEASUREMENTS
Exercise price	$ 0	$ 6.92
Contractual term (years)	0 years	3 months 18 days
Volatility (annual)	0.00%	92.00%
Risk-free rate	0.00%	2.00%
Dividend yield (per share)	0.00%	0.00%