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Accounts Receivable (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Receivables [Abstract] |  |
Schedule of accounts receivable |
|  | December 31, 2020 |  | June 30, 2021
Accounts receivable |  | $ | 81,345 |  |  | $ | 69,996 |
Allowance for doubtful accounts |  |  | (5,047 | ) |  |  | (4,743 | )
Accounts receivable, net |  | $ | 76,298 |  |  | $ | 65,253 |
|  | 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 |
Schedule of allowance for doubtful accounts |
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2020 |  | 2021 |  | 2020 |  | 2021
Balance at beginning of the period |  | $ | 4,524 |  | $ | 4,416 |  |  | $ | 5,537 |  |  | $ | 5,047 |
Charge to expenses |  |  | — |  |  | 318 |  |  |  | (863 | ) |  |  | (196 | )
Write off |  |  | — |  |  | (28 | ) |  |  | — |  |  |  | (131 | )
Exchange difference |  |  | 10 |  |  | 37 |  |  |  | (140 | ) |  |  | 23 |
Balance at end of the period |  | $ | 4,534 |  | $ | 4,743 |  |  | $ | 4,534 |  |  | $ | 4,743 |
|  | 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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