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FAIR VALUE MEASUREMENT - The liability component was valued based on the Income Approach (Details) - 2021 Notes [Member] - Fair Value, Inputs, Level 3 [Member]
6 Months Ended
Jun. 30, 2020
$ / shares
Stock price (USD) $ 3.79
Expected term 1 year 4 months 17 days
Risk free rate 0.16%
Volatility 107.87%
Yield 12.87%