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CONSOLIDATED BALANCE SHEETS (Parenthetical) ¥ in Thousands, $ in Thousands | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2015 $ / shares | Dec. 31, 2014 CNY (¥) | Dec. 31, 2013 $ / shares
--- | --- | --- | --- | --- | --- | ---
Accounts receivable, allowance for doubtful accounts | ¥ | ¥ 1,180 |  | ¥ 670 |  | ¥ 408 |
Accounts payable | 526,461 | $ 75,826 | 457,493 |  |  |
Other current liabilities | 138,841 | $ 19,998 | 150,859 |  |  |
Ordinary shares: |  |  |  |  |  |
Par value | $ / shares |  |  |  | $ 0.0001 |  | $ 0.0001
VIE [Member] |  |  |  |  |  |
Accounts payable | ¥ | 1,198 |  | 1,783 |  |  |
Other current liabilities | ¥ | ¥ 34,240 |  | ¥ 45,078 |  |  |
Common Class A [Member] |  |  |  |  |  |
Ordinary shares: |  |  |  |  |  |
Par value | $ / shares |  | $ 0.0001 |  | 0.0001 |  |
Shares authorized | 470,000,000 | 470,000,000 | 470,000,000 |  |  |
Shares issued | 146,111,244 | 146,111,244 | 138,170,631 |  |  |
Shares outstanding | 146,111,244 | 146,111,244 | 138,170,631 |  |  |
Common Class B [Member] |  |  |  |  |  |
Ordinary shares: |  |  |  |  |  |
Par value | $ / shares |  | $ 0.0001 |  | $ 0.0001 |  |
Shares authorized | 30,000,000 | 30,000,000 | 30,000,000 |  |  |
Shares issued | 13,300,738 | 13,300,738 | 13,300,738 |  |  |
Shares outstanding | 13,300,738 | 13,300,738 | 13,300,738 |  |  |

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