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Accounts Receivable, Net | 12 Months Ended
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Dec. 31, 2014
Receivables [Abstract] |
Accounts Receivable, Net |
3. | ACCOUNTS RECEIVABLE, NET
Accounts receivable and allowance for doubtful accounts consist of the following:
|  | December 31, |
|  | 2013 |  |  | 2014 |
|  | RMB |  |  | RMB |  |  | US$ |
Accounts receivable |  |  | 466,965 |  |  |  | 737,030 |  |  |  | 118,788 |
Allowance for doubtful accounts |  |  | (1,253 | ) |  |  | (335 | ) |  |  | (54 | )
Total |  |  | 465,712 |  |  |  | 736,695 |  |  |  | 118,734 |
As of December 31, 2013 and 2014, all accounts receivable were due from third party customers. An analysis of the allowance for doubtful accounts is as follows:
|  | December 31, |
|  | 2013 |  |  | 2014 |
|  | RMB |  |  | RMB |  |  | US$ |
Beginning balance |  |  | 1,161 |  |  |  | 1,253 |  |  |  | 202 |
Additions charged to bad debt expense |  |  | 251 |  |  |  | 348 |  |  |  | 56 |
Reversal |  |  | — |  |  |  | (306 | ) |  |  | (49 | )
Write off |  |  | (159 | ) |  |  | (960 | ) |  |  | (155 | )
Ending balance |  |  | 1,253 |  |  |  | 335 |  |  |  | 54 |
The Group recognized additions to allowance for doubtful accounts amounting to RMB790, RMB251 and RMB42 (US$7) within general and administrative expenses, for the years ended December 31, 2012, 2013 and 2014, respectively.

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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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