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FAIR VALUE MEASUREMENT (Tables)
12 Months Ended
Dec. 31, 2021
Notes 2021 and 2024  
Schedule of Fair Value Assumptions The following parameters were used:

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​

​

​

​

​

​

​

​

    

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

%

2024 Notes  
Schedule of Fair Value Assumptions

​

​

​

​

​

​

​

​

    

​

​

​

2024 Notes

​

Stock price (USD)

 

​

​

​

0.83

​

Expected term

 

​

​

​

2.67

​

Risk free rate

 

​

​

​

0.90

%

Volatility

 

​

​

​

92.79

%

Yield

 

​

​

​

10.31

%