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Notes and Accounts Receivable | 12 Months Ended
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Dec. 31, 2016
Notes and Accounts Receivable | 6. NOTES AND ACCOUNTS RECEIVABLE
|  | December 31 |
|  | 2015 |  |  | 2016 |
|  | US$ |  |  | US$ |
Notes receivable |  |  | 16 |  |  |  | — |
Trade accounts receivable |  |  | 61,293 |  |  |  | 75,946 |
|  |  | 61,309 |  |  |  | 75,946 |
Allowance for doubtful accounts |  |  | (775 | ) |  |  | (723 | )
Allowance for sales returns and discounts |  |  | (1,555 | ) |  |  | (1,624 | )
|  |  | 58,979 |  |  |  | 73,599 |
The changes in the allowances are summarized as follows:
|  | Year Ended December 31 |
|  | 2014 |  |  | 2015 |  |  | 2016 |
|  | US$ |  |  | US$ |  |  | US$ |
Allowances for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  | 1,275 |  |  |  | 1,167 |  |  |  | 775 |
Reversals charged to expense, net |  |  | (108 | ) |  |  | (392 | ) |  |  | (12 | )
Write-offs |  |  | — |  |  |  | — |  |  |  | (40 | )
Balance, end of year |  |  | 1,167 |  |  |  | 775 |  |  |  | 723 |
|  | Year Ended December 31 |
|  | 2014 |  |  | 2015 |  |  | 2016 |
|  | US$ |  |  | US$ |  |  | US$ |
Allowances for sales returns and discounts |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  | 1,059 |  |  |  | 1,427 |  |  |  | 1,555 |
Additions charged to expense, net |  |  | 1,600 |  |  |  | 1,753 |  |  |  | 3,285 |
Actual sales return and discount |  |  | (1,232 | ) |  |  | (1,625 | ) |  |  | (3,216 | )
Balance, end of year |  |  | 1,427 |  |  |  | 1,555 |  |  |  | 1,624 |

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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 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5066-111524 Reference 2: 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(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(6)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 4: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: 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=66008989&loc=d3e5162-111524 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: 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=66008989&loc=d3e5074-111524 + Details
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