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Accounts Receivable | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Receivables [Abstract] |  |
ACCOUNTS RECEIVABLE | NOTE 3. ACCOUNTS RECEIVABLE Accounts receivable consisted of the following:
|  | December 31, 2021 |  | March 31, 2022
Accounts receivable |  | $ | 93,722 |  |  | $ | 85,324 |
Allowance for credit losses |  |  | (5,005 | ) |  |  | (5,354 | )
Accounts receivable, net |  | $ | 88,717 |  |  | $ | 79,970 |
Movement of allowance for credit losses was as follows:
|  | Three Months Ended March 31,
|  | 2021 |  | 2022
Balance at beginning of the period |  | $ | 5,047 |  |  | $ | 5,005 |
Cumulative-effect adjustment upon adoption of ASU2016-13, Financial instruments – Credit losses (Topic 326) |  |  | — |  |  |  | 866 |
Reversal of expenses |  |  | (514 | ) |  |  | (545 | )
Write off |  |  | (103 | ) |  |  | — |
Exchange difference |  |  | (14 | ) |  |  | 28 |
Balance at end of the period |  | $ | 4,416 |  |  | $ | 5,354 |
| 4. ACCOUNTS RECEIVABLE Accounts receivable consisted of the following:
|  | December 31, 2020 |  | December 31, 2021
Accounts receivable |  | $ | 81,345 |  |  | $ | 93,722 |
Allowance for doubtful accounts |  |  | (5,047 | ) |  |  | (5,005 | )
Accounts receivable, net |  | $ | 76,298 |  |  | $ | 88,717 |
Movement of allowance for doubtful accounts was as follows:
|  | Year Ended December 31,
|  | 2019 |  | 2020 |  | 2021
Balance at beginning of the period |  | $ | 10,111 |  |  | $ | 5,537 |  |  | $ | 5,047 |
(Reserve)/Charge to expenses |  |  | (4,250 | ) |  |  | (240 | ) |  |  | 721 |
Write off |  |  | (233 | ) |  |  | (493 | ) |  |  | (849 | )
Exchange difference |  |  | (91 | ) |  |  | 243 |  |  |  | 86 |
Balance at end of the period |  | $ | 5,537 |  |  | $ | 5,047 |  |  | $ | 5,005 |

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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 https://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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Period Type: | duration