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WARRANT LIABILITY AND FAIR VALUE MEASUREMENTS - Valuation Methodology (Details) - $ / shares | 9 Months Ended
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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%

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