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22. Segment information (Details 3)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Customer A      
Customers accounting for more than 5% of the Group’s revenue 11% 0% 0%
Customer B      
Customers accounting for more than 5% of the Group’s revenue 10% 0% 0%
Customer C      
Customers accounting for more than 5% of the Group’s revenue 6% 0% 0%
Customer D      
Customers accounting for more than 5% of the Group’s revenue 6% 0% 0%