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22. Segment information (Details 2)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplier A
Supplier accounting for more than 5% of Group's purchases	33%	20%	10%
Supplier B
Supplier accounting for more than 5% of Group's purchases	11%	17%	17%
Supplier C
Supplier accounting for more than 5% of Group's purchases	11%	8%	11%
Supplier D
Supplier accounting for more than 5% of Group's purchases	8%	8%	7%
Supplier E
Supplier accounting for more than 5% of Group's purchases	7%	7%	6%
Supplier F
Supplier accounting for more than 5% of Group's purchases	6%	7%	6%

X

- Definition

Description of risks that arise due to the volume of business transacted with a particular supplier or reliance placed on that supplier. At a minimum, the description informs financial statement users of the general nature of the risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6327-108592

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=51801474&loc=d3e7102-108593

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

+ Details

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