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FINANCIAL INFORMATION OF PARENT COMPANY (Condensed Balance Sheets) (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 CNY (¥) | Dec. 31, 2013 CNY (¥) | Dec. 31, 2013 $ / shares
--- | --- | --- | --- | --- | --- | --- | ---
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents | ¥ 917,319 | $ 132,121 | ¥ 787,257 | $ 113,389 | ¥ 206,391 | ¥ 154,156 |
Prepayments and other current assets | 108,495 | 15,627 | 112,122 |  |  |  |
Amounts due from subsidiaries and VIE | 38,772 | 5,584 | 37,565 |  |  |  |
Total current assets | 2,168,033 | 312,262 | 1,768,885 |  |  |  |
Investments in cost method investees other than subsidiaries and VIE | 33,443 | 4,817 | 13,307 |  |  |  |
TOTAL ASSETS | 2,368,265 | 341,101 | 1,889,173 |  |  |  |
Current liabilities: |  |  |  |  |  |  |
Other current liabilities | ¥ | 2,860 |  | 3,954 |  |  |  |
Amounts due to related parties | 0 | 0 | 7,469 |  |  |  |
Total current liabilities | 796,253 | 114,685 | 654,702 |  |  |  |
TOTAL LIABILITIES | 796,253 | 114,685 | 654,702 |  |  |  |
SHAREHOLDERS' EQUITY(DEFICIT) |  |  |  |  |  |  |
Additional paid-in capital | 1,761,430 | 253,699 | 1,535,665 |  |  |  |
Accumulated deficit | (233,866) | (33,684) | (320,499) |  |  |  |
Accumulated other comprehensive income | 44,348 | 6,387 | 19,212 |  |  |  |
Total shareholders' equity | 1,572,012 | 226,416 | 1,234,471 |  | (322,229) | (232,375) |
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY | 2,368,265 | 341,101 | 1,889,173 |  |  |  |
Ordinary shares: |  |  |  |  |  |  |
Par value | $ / shares |  |  |  | $ 0.0001 |  |  | $ 0.0001
Class A ordinary shares [Member] |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY(DEFICIT) |  |  |  |  |  |  |
Ordinary shares | ¥ 92 | $ 13 | ¥ 85 |  |  |  |
Ordinary shares: |  |  |  |  |  |  |
Par value | $ / shares |  | $ 0.0001 |  | $ 0.0001 |  |  |
Shares authorized | 470,000,000 | 470,000,000 | 470,000,000 | 470,000,000 |  |  |
Shares issued | 146,111,244 | 146,111,244 | 138,170,631 | 138,170,631 |  |  |
Shares outstanding | 146,111,244 | 146,111,244 | 138,170,631 | 138,170,631 |  |  |
Class B ordinary shares [Member] |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY(DEFICIT) |  |  |  |  |  |  |
Ordinary shares | ¥ 8 | $ 1 | ¥ 8 |  |  |  |
Ordinary shares: |  |  |  |  |  |  |
Par value | $ / shares |  | $ 0.0001 |  | $ 0.0001 |  |  |
Shares authorized | 30,000,000 | 30,000,000 | 30,000,000 | 30,000,000 |  |  |
Shares issued | 13,300,738 | 13,300,738 | 13,300,738 | 13,300,738 |  |  |
Shares outstanding | 13,300,738 | 13,300,738 | 13,300,738 | 13,300,738 |  |  |
Parent Company [Member] |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents | ¥ 460,670 | $ 66,350 | ¥ 254,213 | $ 36,614 | ¥ 144,814 |  |
Prepayments and other current assets | 2,526 | 364 | 7,180 |  |  |  |
Amounts due from subsidiaries and VIE | 779,762 | 112,309 | 764,883 |  |  |  |
Total current assets | 1,242,958 | 179,023 | 1,026,276 |  |  |  |
Investments in subsidiaries and VIE | 325,144 | 46,830 | 218,147 |  |  |  |
Investments in cost method investees other than subsidiaries and VIE | 6,682 | 962 | 6,682 |  |  |  |
TOTAL ASSETS | 1,574,784 | 226,815 | 1,251,105 |  |  |  |
Current liabilities: |  |  |  |  |  |  |
Other current liabilities | 2,772 | 399 | 9,165 |  |  |  |
Amounts due to related parties |  |  | 7,469 |  |  |  |
Total current liabilities | 2,772 | 399 | 16,634 |  |  |  |
TOTAL LIABILITIES | 2,772 | 399 | 16,634 |  |  |  |
SHAREHOLDERS' EQUITY(DEFICIT) |  |  |  |  |  |  |
Additional paid-in capital | 1,761,430 | 253,699 | 1,535,665 |  |  |  |
Accumulated deficit | (233,866) | (33,684) | (320,499) |  |  |  |
Accumulated other comprehensive income | 44,348 | 6,387 | 19,212 |  |  |  |
Total shareholders' equity | 1,572,012 | 226,416 | 1,234,471 |  |  |  |
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY | 1,574,784 | 226,815 | 1,251,105 |  |  |  |
Parent Company [Member] | Class A ordinary shares [Member] |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY(DEFICIT) |  |  |  |  |  |  |
Ordinary shares | ¥ 92 | $ 13 | ¥ 85 |  |  |  |
Ordinary shares: |  |  |  |  |  |  |
Par value | $ / shares |  | $ 0.0001 |  | $ 0.0001 |  |  |
Shares authorized | 470,000,000 | 470,000,000 | 470,000,000 | 470,000,000 |  |  |
Shares issued | 146,111,244 | 146,111,244 |  |  |  |  |
Shares outstanding |  |  | 146,111,244 | 146,111,244 |  |  |
Parent Company [Member] | Class B ordinary shares [Member] |  |  |  |  |  |  |
SHAREHOLDERS' EQUITY(DEFICIT) |  |  |  |  |  |  |
Ordinary shares | ¥ 8 | $ 1 | ¥ 8 |  |  |  |
Ordinary shares: |  |  |  |  |  |  |
Par value | $ / shares |  | $ 0.0001 |  | $ 0.0001 |  |  |
Shares authorized | 30,000,000 | 30,000,000 | 30,000,000 | 30,000,000 |  |  |
Shares issued | 13,300,738 | 13,300,738 |  |  |  |  |
Shares outstanding |  |  | 13,300,738 | 13,300,738 |  |  |

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