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Accrued Expenses and Other Current Liabilities | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Accrued Expenses and Other Current Liabilities [Abstract] |  |
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES | 7. ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES
|  | December 31, 2020 |  | September 30, 2021
Payables to exiting investors |  | $ | 30,000 |  | $ | —
Payables for purchase of property, plant and equipment |  |  | 15,122 |  |  | 13,017
Product warranty |  |  | 4,296 |  |  | 18,690
Other current liabilities |  |  | 3,959 |  |  | 8,469
Accrued payroll and welfare |  |  | 2,704 |  |  | 2,818
Interest payable |  |  | 1,379 |  |  | 2,674
Accrued expenses |  |  | 1,696 |  |  | 1,972
Other tax payable |  |  | 1,472 |  |  | 425
Total |  | $ | 60,628 |  | $ | 48,065
The payables to exiting investors represents the amount due in a year for the redemption of the shares owned by certain noncontrolling shareholders of a subsidiary. See Note 14. | 9. ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES
|  | December 31, 2019 |  | December 31, 2020
Payable to exiting Investors |  | $ | — |  | $ | 30,000
Payables for purchase of property, plant and equipment |  |  | 23,515 |  |  | 15,122
Product warranty |  |  | 3,723 |  |  | 4,296
Accrued payroll and welfare |  |  | 2,577 |  |  | 2,704
Accrued expenses |  |  | 2,103 |  |  | 1,696
Deferred subsidy income-current |  |  | 127 |  |  | 215
Deposits received from the contractors |  |  | 275 |  |  | 102
Other tax payable |  |  | 494 |  |  | 1,472
Other current liabilities |  |  | 2,181 |  |  | 5,021
Total |  | $ | 34,995 |  | $ | 60,628
The payable for exiting Investors represents the amount to be paid for the redemption of the shares owned by certain noncontrolling shareholders of a subsidiary. See Note 15.

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