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Additional information: condensed financial statements of the Company (Condensed balance sheets) (Parenthetical) (Details) - $ / shares | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Class A common shares [Member] |  |  |
Condensed balance sheets [Line Items] |  |  |
Common shares, par value (in dollars per share) | $ 0.00001 | $ 0.00001 |
Common shares, shares authorized | 10,000,000,000 | 10,000,000,000 | 10,000,000,000
Common shares, shares issued | 728,227,848 | 706,173,568 | 622,658,738
Common shares, shares outstanding | 728,227,848 | 706,173,568 | 622,658,738
Class B common shares [Member] |  |  |
Condensed balance sheets [Line Items] |  |  |
Common shares, par value (in dollars per share) | $ 0.00001 | $ 0.00001 |
Common shares, shares authorized | 1,000,000,000 | 1,000,000,000 | 1,000,000,000
Common shares, shares issued | 369,557,976 | 427,352,696 | 485,831,386
Common shares, shares outstanding | 369,557,976 | 427,352,696 | 485,831,386
Parent [Member] | Class A common shares [Member] |  |  |
Condensed balance sheets [Line Items] |  |  |
Common shares, par value (in dollars per share) | $ 0.00001 | $ 0.00001 |
Common shares, shares authorized | 10,000,000,000 | 10,000,000,000 |
Common shares, shares issued | 728,227,848 | 706,173,568 |
Common shares, shares outstanding | 728,227,848 | 706,173,568 |
Parent [Member] | Class B common shares [Member] |  |  |
Condensed balance sheets [Line Items] |  |  |
Common shares, par value (in dollars per share) | $ 0.00001 | $ 0.00001 |
Common shares, shares authorized | 1,000,000,000 | 1,000,000,000 |
Common shares, shares issued | 369,557,976 | 427,352,696 |
Common shares, shares outstanding | 369,557,976 | 427,352,696 |

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