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Concentrations of risk and segment information - Schedule of Customer Concentration by Risk Factor (Details) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Accounts Receivable [Member] | A (Retailer) [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			17.00%		14.00%
Accounts Receivable [Member] | Customer B (Retailer) [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			16.00%		17.00%
Accounts Receivable [Member] | Customer C (Retailer) [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			12.00%
Accounts Receivable [Member] | Customer D [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			10.00%
Accounts Receivable [Member] | Customer E (Distributor) [Member]
Concentration Risk [Line Items]
Concentration risk, percentage					11.00%
Sales Revenue [Member] | A (Retailer) [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	14.00%	27.00%	14.00%	19.00%
Sales Revenue [Member] | Customer B (Retailer) [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 275



-SubTopic 10



-Section 50



-Paragraph 18



-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592



Reference 2: http://www.xbrl.org/2003/role/presentationRef



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-Publisher FASB



-Name Accounting Standards Codification



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