v3.10.0.1

Summary of significant accounting policies - Concentrations of credit risk (Details) - Customer - item | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Total Revenue | Customer Group |  |  |
Concentrations of credit risk |  |  |
Number of customer group | 3 | 4 | 2
Concentration risk percentage | 37.00% | 44.00% | 23.00%
Total accounts receivable | Customer Group |  |  |
Concentrations of credit risk |  |  |
Number of customer group | 4 | 3 |
Total accounts receivable | Customer Group One |  |  |
Concentrations of credit risk |  |  |
Concentration risk percentage | 20.00% | 19.00% |
Total accounts receivable | Customer Group Two |  |  |
Concentrations of credit risk |  |  |
Concentration risk percentage | 19.00% | 17.00% |
Total accounts receivable | Customer Group Three |  |  |
Concentrations of credit risk |  |  |
Concentration risk percentage | 17.00% | 13.00% |
Total accounts receivable | Customer Group Four |  |  |
Concentrations of credit risk |  |  |
Concentration risk percentage | 13.00% |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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