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Net loss per share (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) item $ / shares shares	Dec. 31, 2016 CNY (¥) item ¥ / shares shares	Dec. 31, 2015 CNY (¥) ¥ / shares shares	Dec. 31, 2014 CNY (¥) ¥ / shares shares
Numerator:
Net loss attributable to ordinary shareholders - basic	$ (548,291)	¥ (3,806,790)	¥ (9,107,940)	¥ (12,953,998)
Net loss attributable to ordinary shareholders - diluted | ¥		¥ (3,806,790)	¥ (9,107,940)	¥ (12,953,998)
Denominator:
Weighted average number of shares - basic	2,804,767,889	2,804,767,889	2,735,034,034	2,419,668,247
Weighted average number of shares - diluted	2,804,767,889	2,804,767,889	2,735,034,034	2,419,668,247
Basic net loss per share attributable to ordinary shareholders | (per share)	$ (0.20)	¥ (1.36)	¥ (3.33)	¥ (5.35)
Diluted net loss per share attributable to ordinary shareholders | (per share)	$ (0.20)	¥ (1.36)	¥ (3.33)	¥ (5.35)
Number of different classes of shares presented | item	3	3

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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