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Concentration and risk (Narrative) (Details)	12 Months Ended
Concentration and risk (Narrative) (Details)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY	Dec. 31, 2013 USD ($)	Dec. 31, 2011 CNY
Concentration Risk [Line Items]
Cash and cash equivalents	$ 149,861,000	929,829,000	179,658,000	31,365,000	$ 28,956,000	2,985,000
Cash and cash equivalents subject to government currency conversion controls		56,669,000	71,163,000
Accumulated deficit	(201,144,000)us-gaap_RetainedEarningsUnappropriated	(1,248,020,000)us-gaap_RetainedEarningsUnappropriated	(322,619,000)us-gaap_RetainedEarningsUnappropriated
Net cash (used in)/provided by operating activities	$ 3,312,000	20,544,000	57,693,000	(3,651,000)

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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