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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

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