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FAIR VALUE MEASUREMENT - The liability component was valued based on the Income Approach (Details) - Fair Value, Inputs, Level 3 | Sep. 30, 2021 Y $ / shares | Aug. 25, 2021 Y $ / shares
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2021 Notes | Share Price |  |
Debt Instrument, Measurement Input | $ / shares | 1.33 | 1.34
2021 Notes | Expected term |  |
Debt Instrument, Measurement Input | Y | 0.13 | 0.23
2021 Notes | Risk free rate |  |
Debt Instrument, Measurement Input | 0.04 | 0.05
2021 Notes | Volatility |  |
Debt Instrument, Measurement Input | 81.16 | 78.95
2021 Notes | Yield |  |
Debt Instrument, Measurement Input | 6.74 | 7.87
2024 Notes | Share Price |  |
Debt Instrument, Measurement Input | $ / shares | 1.33 | 1.34
2024 Notes | Expected term |  |
Debt Instrument, Measurement Input | Y | 2.92 | 3.03
2024 Notes | Risk free rate |  |
Debt Instrument, Measurement Input | 0.50 | 0.44
2024 Notes | Volatility |  |
Debt Instrument, Measurement Input | 91.77 | 91.35
2024 Notes | Yield |  |
Debt Instrument, Measurement Input | 8.99 | 7.66

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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=123874694&loc=d3e19207-110258 + Details
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