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Notes and Accounts Receivable | 12 Months Ended
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Dec. 31, 2014
Notes and Accounts Receivable | 5. NOTES AND ACCOUNTS RECEIVABLE
|  | December 31 |
|  | 2013 |  |  | 2014 |
|  | US$ |  |  | US$ |
Notes receivable |  |  | 251 |  |  |  | 192 |
Trade accounts receivable |  |  | 33,296 |  |  |  | 31,256 |
|  |  | 33,547 |  |  |  | 31,448 |
Allowance for doubtful accounts |  |  | (1,275 | ) |  |  | (1,167 | )
Allowance for sales returns and discounts |  |  | (1,059 | ) |  |  | (1,427 | )
|  |  | 31,213 |  |  |  | 28,854 |
The changes in the allowances are summarized as follows:
|  | Year Ended December 31 |
|  | 2012 |  |  | 2013 |  |  | 2014 |
|  | US$ |  |  | US$ |  |  | US$ |
Allowances for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  | 2,648 |  |  |  | 1,634 |  |  |  | 1,275 |
Additions (reversals) charged to expense, net |  |  | (663 | ) |  |  | (359 | ) |  |  | (108 | )
Write-offs |  |  | (351 | ) |  |  | — |  |  |  | — |
Balance, end of year |  |  | 1,634 |  |  |  | 1,275 |  |  |  | 1,167 |
|  | Year Ended December 31 |
|  | 2012 |  |  | 2013 |  |  | 2014 |
|  | US$ |  |  | US$ |  |  | US$ |
Allowances for sales returns and discounts |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  | 2,709 |  |  |  | 1,919 |  |  |  | 1,059 |
Additions |  |  | 297 |  |  |  | 1,320 |  |  |  | 1,600 |
Write-offs |  |  | (1,087 | ) |  |  | (2,180 | ) |  |  | (1,232 | )
Balance, end of year |  |  | 1,919 |  |  |  | 1,059 |  |  |  | 1,427 |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5066-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Article 4 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5162-111524 + Details
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