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ACCOUNTS RECEIVABLE, NET (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥)
Accounts receivable net |  |  |  |  |  |
Accounts receivable |  |  |  | $ 98,513 | ¥ 638,148 | ¥ 263,577
Allowance for doubtful accounts | $ (499) | ¥ (3,230) | ¥ (72) | (2,716) | (17,592) | (3,230)
Accounts receivable, net |  |  |  | $ 95,797 | ¥ 620,556 | ¥ 260,347
Movement of the allowance for doubtful receivables |  |  |  |  |  |
Balance at the beginning of the year | 499 | 3,230 | 72 |  |  |
Charged to general and administrative expenses | 2,057 | 13,326 | 3,230 |  |  |
Additions in connection with business acquisition | 113 | 729 |  |  |  |
Write-off during the year |  |  | (72) |  |  |
Foreign Exchange effect | 47 | 307 |  |  |  |
Balance at the end of the year | $ 2,716 | ¥ 17,592 | ¥ 3,230 |  |  |

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