v3.8.0.1

Summary of significant accounting policies - Concentrations of credit risk (Details) - Customer - item	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Total Revenue | Customer Group
Concentrations of credit risk
Concentration risk percentage	44.00%	23.00%	17.00%
Number of customer group	4	2	1
Total accounts receivable | Customer Group
Concentrations of credit risk
Number of customer group	3	3
Total accounts receivable | Customer Group One
Concentrations of credit risk
Concentration risk percentage	19.00%	26.00%
Total accounts receivable | Customer Group Two
Concentrations of credit risk
Concentration risk percentage	17.00%	18.00%
Total accounts receivable | Customer Group Three
Concentrations of credit risk
Concentration risk percentage	13.00%	17.00%

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- Definition

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+ References

No definition available.

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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=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

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-Name Accounting Standards Codification
-Topic 275
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 21
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