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FAIR VALUE MEASUREMENT (Tables)
12 Months Ended
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

%