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Additional information - condensed financial statements of the Company (Condensed balance sheets) (Parenthetical) (Details) - $ / shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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	981,740,848	945,245,908
Common shares, shares outstanding	981,740,848	945,245,908
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	288,182,976	317,982,976
Common shares, shares outstanding	288,182,976	317,982,976
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	981,740,848	945,245,908
Common shares, shares outstanding	981,740,848	945,245,908
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	288,182,976	317,982,976
Common shares, shares outstanding	288,182,976	317,982,976

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Face amount or stated value per share of common stock.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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