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Financial risk management objectives and policies - Concentration of credit risk (Table) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 17,354 | $ 13,852 | $ 8,423
Percentage of entity's revenue | 100.00% | 100.00% | 100.00%
A |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 3,679 | $ 1,404 | $ 0
Percentage of entity's revenue | 21.00% | 10.00% | 0.00%
B |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 2,873 | $ 0 | $ 890
Percentage of entity's revenue | 17.00% | 0.00% | 11.00%
C |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 0 | $ 1,849 | $ 0
Percentage of entity's revenue | 0.00% | 13.00% | 0.00%
D |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 0 | $ 1,459 | $ 0
Percentage of entity's revenue | 0.00% | 11.00% | 0.00%
E |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 0 | $ 0 | $ 1,013
Percentage of entity's revenue | 0.00% | 0.00% | 12.00%
Other |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 10,802 | $ 9,140 | $ 6,520
Percentage of entity's revenue | 62.00% | 66.00% | 77.00%

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