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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] | 12 Months Ended
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Dec. 31, 2019 $ / shares
Stock price (USD) | $ 3.28
Expected term | 1 year 10 months 17 days
Risk free rate | 1.57%
Volatility | 90.74%
Yield | 11.02%

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- Definition Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). + References No definition available. + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References No definition available. + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Details
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- Details
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