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Summary of significant accounting policies - Schedule of Concentrations of Risk (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue | Customer A
Product Information [Line Items]
Concentration risk percentage	21.00%	25.00%	28.00%
Revenue | Customer B
Product Information [Line Items]
Concentration risk percentage	30.00%	29.00%	30.00%
Accounts Receivable | Customer A
Product Information [Line Items]
Concentration risk percentage	27.00%	29.00%
Accounts Receivable | Customer B
Product Information [Line Items]
Concentration risk percentage	20.00%	17.00%
Accounts Receivable | Customer C
Product Information [Line Items]
Concentration risk percentage		17.00%

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
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