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Long-Term Investments (Tables)
12 Months Ended
Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]  
Long-Term Investments

 

 

 

December 31,

2021

 

 

December 31,

2020

 

Long-term investments

 

 

10

 

 

 

10

 

Total

 

 

10

 

 

 

10