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WARRANT LIABILITY AND FAIR VALUE MEASUREMENTS - Valuation Methodology (Details) - Share Purchase Warrants - $ / shares
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Exercise price $ 0 $ 9.72
Contractual term (years) 0 years 6 months 29 days
Volatility (annual) 0.00% 78.00%
Risk-free rate 0.00% 2.00%
Dividend yield (per share) 0.00% 0.00%