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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]	Mar. 31, 2021 $ / shares
Measurement Input, Share Price [Member]
Debt Instrument, Measurement Input	4.46
Measurement Input, Expected Term [Member]
Debt Instrument, Measurement Input	0.63
Measurement Input, Risk Free Interest Rate [Member]
Debt Instrument, Measurement Input	0.05
Measurement Input, Price Volatility [Member]
Debt Instrument, Measurement Input	71.89
Measurement Input, Yield [Member]
Debt Instrument, Measurement Input	11.54

X

- 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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