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FAIR VALUE MEASUREMENT (Tables)
3 Months Ended
Mar. 31, 2021
Notes 2021 [Member]  
Schedule of liability component based on income approach

    

2021 Notes

Stock price (USD)

 

4.46

Expected term

 

0.63

Risk free rate

 

0.05

%

Volatility

 

71.89

%

Yield

 

11.54

%