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Additional Information - Condensed Financial Statements of the Company (Balance Sheets) (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2013 CNY (¥)
--- | --- | --- | --- | --- | --- | ---
Current assets: |  |  |  |  |  |
Cash and cash equivalents | ¥ 202,694 | $ 29,194 | ¥ 310,669 | $ 44,746 | ¥ 1,285,847 | ¥ 845,138
Term deposits and short term investments | 781,298 | 112,530 | 769,681 |  |  |
Amounts due from related parties | 156,260 | 22,506 | 124,677 |  |  |
Prepayments and other current assets | 64,069 | 9,228 | 58,574 |  |  |
Convertible loans due from a related party | 104,429 | 15,041 | 0 |  |  |
Total current assets | 2,122,692 | 305,731 | 1,930,915 |  |  |
Non-current assets: |  |  |  |  |  |
Available-for-sale investments | 939,432 | 135,306 | 513,994 |  |  |
Total non-current assets | 1,045,850 | 150,634 | 636,291 |  |  |
Total assets | 3,168,542 | 456,365 | 2,567,206 |  |  |
Current liabilities: |  |  |  |  |  |
Amounts due to related parties | 18,720 | 2,696 | 19,368 |  |  |
Accrued expenses and other current liabilities | 111,049 | 15,994 | 80,891 |  |  |
Total current liabilities | 983,079 | 141,592 | 742,840 |  |  |
Total liabilities | 1,006,114 | 144,910 | 762,520 |  |  |
Shareholders' equity: |  |  |  |  |  |
Additional paid-in capital | 1,555,511 | 224,040 | 1,551,104 |  |  |
Statutory reserves | 77,946 | 11,227 | 70,311 |  |  |
Retained earnings | 195,069 | 28,096 | 122,093 |  |  |
Accumulated other comprehensive income | 298,346 | 42,971 | 23,341 |  |  |
Total shareholders' equity | 2,162,428 | 311,455 | 1,804,686 |  | 1,716,658 | 1,575,035
Total liabilities and shareholders' equity | 3,168,542 | 456,365 | 2,567,206 |  |  |
Class A ordinary shares (US$0.01 par value, 680,000,000 shares authorized; 253,250,854 and 254,909,790 shares issued and outstanding as of December 31, 2015 and 2016, respectively) [Member] |  |  |  |  |  |
Shareholders' equity: |  |  |  |  |  |
Ordinary shares | 16,843 | 2,426 | 16,733 |  |  |
Class B ordinary shares (US$0.01 par value, 320,000,000 shares authorized; 317,325,360 and 317,325,360 shares issued and outstanding as of December 31, 2015 and 2016, respectively) [Member] |  |  |  |  |  |
Shareholders' equity: |  |  |  |  |  |
Ordinary shares | 22,053 | 3,176 | 22,053 |  |  |
Parent Company [Member] |  |  |  |  |  |
Current assets: |  |  |  |  |  |
Cash and cash equivalents | 32,731 | 4,714 | 14,022 | $ 2,020 | ¥ 341,433 | ¥ 588,961
Term deposits and short term investments | 0 | 0 | 83,854 |  |  |
Amounts due from related parties | 50,343 | 7,251 | 30 |  |  |
Amounts due from subsidiaries and VIEs | 228,050 | 32,846 | 216,451 |  |  |
Prepayments and other current assets | 1,565 | 225 | 1,991 |  |  |
Convertible loans due from a related party | 104,429 | 15,041 | 0 |  |  |
Total current assets | 417,118 | 60,077 | 316,348 |  |  |
Non-current assets: |  |  |  |  |  |
Investments using equity accounting | 1,251,578 | 180,266 | 1,189,213 |  |  |
Available-for-sale investments | 939,432 | 135,306 | 513,994 |  |  |
Total non-current assets | 2,191,010 | 315,572 | 1,703,207 |  |  |
Total assets | 2,608,128 | 375,649 | 2,019,555 |  |  |
Current liabilities: |  |  |  |  |  |
Amounts due to related parties | 4,609 | 664 | 3,326 |  |  |
Amounts due to subsidiaries and VIEs | 435,724 | 62,757 | 205,268 |  |  |
Accrued expenses and other current liabilities | 2,027 | 292 | 5,326 |  |  |
Total current liabilities | 442,360 | 63,713 | 213,920 |  |  |
Total liabilities | 442,360 | 63,713 | 213,920 |  |  |
Shareholders' equity: |  |  |  |  |  |
Additional paid-in capital | 1,555,511 | 224,040 | 1,551,104 |  |  |
Statutory reserves | 77,946 | 11,227 | 70,311 |  |  |
Retained earnings | 195,069 | 28,096 | 122,093 |  |  |
Accumulated other comprehensive income | 298,346 | 42,971 | 23,341 |  |  |
Total shareholders' equity | 2,165,768 | 311,936 | 1,805,635 |  |  |
Total liabilities and shareholders' equity | 2,608,128 | 375,649 | 2,019,555 |  |  |
Parent Company [Member] | Class A ordinary shares (US$0.01 par value, 680,000,000 shares authorized; 253,250,854 and 254,909,790 shares issued and outstanding as of December 31, 2015 and 2016, respectively) [Member] |  |  |  |  |  |
Shareholders' equity: |  |  |  |  |  |
Ordinary shares | 16,843 | 2,426 | 16,733 |  |  |
Parent Company [Member] | Class B ordinary shares (US$0.01 par value, 320,000,000 shares authorized; 317,325,360 and 317,325,360 shares issued and outstanding as of December 31, 2015 and 2016, respectively) [Member] |  |  |  |  |  |
Shareholders' equity: |  |  |  |  |  |
Ordinary shares | ¥ 22,053 | $ 3,176 | ¥ 22,053 |  |  |

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