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Notes and Accounts Receivable | 12 Months Ended
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Dec. 31, 2020
Receivables [Abstract] |
Notes and Accounts Receivable | 5. NOTES AND ACCOUNTS RECEIVABLE
|  | December 31 |
|  | 2019 |  |  | 2020 |
|  | US$ |  |  | US$ |
Trade accounts receivable |  |  | 110,351 |  |  |  | 117,387 |
Allowance for doubtful accounts |  |  | (1,617 | ) |  |  | (1,561 | )
|  |  | 108,734 |  |  |  | 115,826 |
The changes in allowance are summarized as follows:
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | US$ |  |  | US$ |  |  | US$ |
Allowance for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  | 598 |  |  |  | 645 |  |  |  | 1,617 |
Additions (reversals) charged to expense, net |  |  | 47 |  |  |  | 1,164 |  |  |  | 15 |
Write-offs |  |  | — |  |  |  | (192 | ) |  |  | (71 | )
Balance, end of year |  |  | 645 |  |  |  | 1,617 |  |  |  | 1,561 |

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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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- References No definition available. + Details
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