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Long-Term Debt, Net - HSH Nordbank AG Loan Agreement (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2015 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Feb. 28, 2015
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Cash and cash equivalents | $ 1,588 |  | $ 2,756 | $ 826 | $ 163 |
Cash and cash equivalents, unrealized amount | $ 1,967 |  |  |  |  |
HSH Nordbank AG |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Loan Facility, Maximum borrowing capacity |  |  |  |  |  | $ 30,000
HSH Nordbank AG | Minimum |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total liabilities to market adjusted total assets ratio | 78.00% | 75.00% |  |  |  |
Compensating Balance, Amount per vessel |  | $ 250 |  |  |  |
Liquidity to indebtedness ratio |  | 5.00% |  |  |  |
Market Adjusted Net Worth | $ 12,288 | $ 30,000 |  |  |  |
HSH Nordbank AG | Minimum | Devocean Maritime LTD., Domina Maritime LTD. & Dulac Maritime S.A. |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Compensating Balance, Amount | $ 0 | $ 750 |  |  |  |

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