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FAIR VALUE MEASUREMENT (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes 2021 [Member] |
Schedule of liability component based on income approach |
​ | ​ | ​ | ​
​ |  | 2021 Notes | ​
Stock price (USD) |  | 3.63 | ​
Expected term |  | 0.87 | ​
Risk free rate |  | 0.10 | %
Volatility |  | 75.84 | %
Yield |  | 10.44 | %

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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=117815213&loc=d3e19207-110258 + Details
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