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FAIR VALUE MEASUREMENT (Tables) - Notes 2021 and 2024 | 9 Months Ended
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Sep. 30, 2021
Schedule of liability component based on income approach | The Company prepared a valuation of the fair value of the 2024 Notes and 2021 Notes (a Level 3 valuation) as of August 25, 2021. The value was estimated by implementing the binomial model. The liability component was valued based on the Income Approach. The following parameters were used:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 Notes | ​ | ​ | 2024 Notes | ​
Stock price (USD) |  | 1.34 | ​ | ​ | 1.34 | ​
Expected term |  | 0.23 | ​ | ​ | 3.03 | ​
Risk free rate |  | 0.05 | % | ​ | 0.44 | %
Volatility |  | 78.95 | % | ​ | 91.35 | %
Yield |  | 7.87 | % | ​ | 7.66 | %
Fair Value, Inputs, Level 3 |
Schedule of liability component based on income approach | The Company prepared a valuation of the fair value of the Company’s outstanding 2021 Notes and 2024 Notes (a Level 3 valuation) as of September 30, 2021. The value of these notes was estimated by implementing the binomial model. The liability component was valued based on the Income Approach. The following parameters were used:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 Notes | ​ | ​ | 2024 Notes | ​
Stock price (USD) |  | 1.33 | ​ | ​ | 1.33 | ​
Expected term |  | 0.13 | ​ | ​ | 2.92 | ​
Risk free rate |  | 0.04 | % | ​ | 0.50 | %
Volatility |  | 81.16 | % | ​ | 91.77 | %
Yield |  | 6.74 | % | ​ | 8.99 | %

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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