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Accounts Receivable | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Receivables [Abstract] |  |
ACCOUNTS RECEIVABLE | 4. ACCOUNTS RECEIVABLE Accounts receivable consisted of the following:
|  | December 31, 2020 |  | September 30, 2021
Accounts receivable |  | $ | 81,345 |  |  | $ | 72,039 |
Allowance for doubtful accounts |  |  | (5,047 | ) |  |  | (4,796 | )
Accounts receivable, net |  | $ | 76,298 |  |  | $ | 67,243 |
Movement of allowance for doubtful accounts was as follows:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2020 |  | 2021 |  | 2020 |  | 2021
Balance at beginning of the period |  | $ | 4,534 |  | $ | 4,743 |  |  | $ | 5,537 |  |  | $ | 5,047 |
Charge to expenses |  |  | 2 |  |  | 457 |  |  |  | (861 | ) |  |  | 261 |
Write off |  |  | — |  |  | (415 | ) |  |  | — |  |  |  | (546 | )
Exchange difference |  |  | 173 |  |  | 11 |  |  |  | 33 |  |  |  | 34 |
Balance at end of the period |  | $ | 4,709 |  | $ | 4,796 |  |  | $ | 4,709 |  |  | $ | 4,796 |
| 3. ACCOUNTS RECEIVABLE Accounts receivable consisted of the following:
|  | December 31, 2019 |  | December 31, 2020
Accounts receivable |  | $ | 73,178 |  |  | $ | 81,345 |
Allowance for doubtful accounts |  |  | (5,537 | ) |  |  | (5,047 | )
Accounts receivable, net |  | $ | 67,641 |  |  | $ | 76,298 |
Movement of allowance for doubtful accounts was as follows:
|  | December 31, 2019 |  | December 31, 2020
Balance at beginning of year |  | $ | 10,111 |  |  | $ | 5,537 |
Charge to expenses |  |  | (4,250 | ) |  |  | (240 | )
Write off |  |  | (233 | ) |  |  | (493 | )
Exchange difference |  |  | (91 | ) |  |  | 243 |
Balance at end of year |  | $ | 5,537 |  |  | $ | 5,047 |

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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Namespace Prefix: | us-gaap_
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- References No definition available. + Details
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