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Bank Borrowings (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Bank Borrowings [Abstract]    
Schedule of changes in bank borrowings
 

Three Months Ended
September 30,

  

Nine Months Ended
September 30,
   

2020

  

2021

  

2020

  

2021

Beginning balance

  

$

9,412

 

  

$

26,458

 

  

$

11,922

 

  

$

12,184

 

Proceeds from bank borrowings

  

 

5,757

 

  

 

—

 

  

 

15,230

 

  

 

26,603

 

Repayments of principal

  

 

(5,696

)

  

 

(3,400

)

  

 

(17,590

)

  

 

(15,665

)

Exchange difference

  

 

321

 

  

 

(207

)

  

 

232

 

  

 

(271

)

Ending balance

  

$

9,794

 

  

$

22,851

 

  

$

9,794

 

  

$

22,851

 
 

December 31,
2019

  

December 31,
2020

Beginning balance as of January 1

  

$

66,267

 

  

$

11,922

 

Proceeds from bank borrowings

  

 

17,735

 

  

 

17,308

 

Repayments of principal during the year

  

 

(71,674

)

  

 

(17,815

)

Exchange difference

  

 

(406

)

  

 

769

 

Ending balance as of December 31

  

$

11,922

 

  

$

12,184

 
   

 

  

 

  

 

  

 

Including:

  

 

  

 

  

 

  

 

Current

  

$

11,922

 

  

$

12,184

 

Total

  

$

11,922

 

  

$

12,184

 
Schedule of banking facilities and aggregate carrying amount
 

December 31,
2020

  

September 30,
2021

Buildings

  

$

22,732

  

$

31,479

Machinery and equipment

  

 

19,297

  

 

17,173

Land use rights

  

 

2,789

  

 

4,448

Total

  

$

44,818

  

$

53,100
 

December 31,
2019

  

December 31,
2020

Buildings

  

$

22,414

  

$

22,732

Machinery and equipment

  

 

20,936

  

 

19,297

Land use rights

  

 

2,672

  

 

2,789

Total

  

$

46,022

  

$

44,818