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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 14,392 | $ 8,740 | $ 12,715
Percentage of entity's revenue | 100.00% | 100.00% | 100.00%
A |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 1,921 | $ 0 | $ 0
Percentage of entity's revenue | 13.00% | 0.00% | 0.00%
B |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 1,516 | $ 0 | $ 0
Percentage of entity's revenue | 11.00% | 0.00% | 0.00%
C |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 1,459 | $ 0 | $ 0
Percentage of entity's revenue | 10.00% | 0.00% | 0.00%
D |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 0 | $ 1,052 | $ 586
Percentage of entity's revenue | 0.00% | 12.00% | 5.00%
E |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 0 | $ 925 | $ 934
Percentage of entity's revenue | 0.00% | 11.00% | 7.00%
Other |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Revenue | $ 9,496 | $ 6,763 | $ 11,195
Percentage of entity's revenue | 66.00% | 77.00% | 88.00%

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