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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] | Dec. 31, 2020 $ / shares
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Measurement Input, Share Price [Member] |
Debt Instrument, Measurement Input | 3.63
Measurement Input, Expected Term [Member] |
Debt Instrument, Measurement Input | 0.87
Measurement Input, Risk Free Interest Rate [Member] |
Debt Instrument, Measurement Input | 0.10
Measurement Input, Price Volatility [Member] |
Debt Instrument, Measurement Input | 75.84
Measurement Input, Yield [Member] |
Debt Instrument, Measurement Input | 10.44

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- Definition Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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