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Basis of Preparation And Significant Accounting Policies (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Basis of Preparation and Significant Accounting Policies [line items] |  |  |  |
Working capital deficit |  | $ (43,323,000) |  |
Provision for doubtful trade receivables |  | 138,000 | $ 47,000 |
Borrowing costs capitalised |  | $ 0 | 0 | $ 0
Number of Operating Segments |  | 1 |  |
Description of the nature of the benefits provided by the defined benefit plan |  | If the employees’ remain in the employment of the Company until normal retirement age, they are entitled to retirement compensation which is equal to 40% of the compensation amount that would be payable if they were dismissed at that time. |  |
Net defined benefit liability |  | $ 82,000 | 78,000 |
Current portion of long-term borrowings |  | 41,538,000 | 23,550,000 |
HSH Nordbank AG and DVB Bank SE |  |  |  |
Basis of Preparation and Significant Accounting Policies [line items] |  |  |  |
Current portion of long-term borrowings |  | $ 41,538,000 |  |
Vessels |  |  |  |
Basis of Preparation and Significant Accounting Policies [line items] |  |  |  |
Depreciation method |  | straight-line basis |  |
Useful life |  | 25 years |  |
Vessels scrap rate | $ 335 | $ 250 | 200 | 240
Increase / (decrease) in depreciation expense due to changes in scrap rates |  | $ (86,000) | $ 96,000 | $ 91,000
Deferred dry docking costs |  |  |  |
Basis of Preparation and Significant Accounting Policies [line items] |  |  |  |
Depreciation method |  | straight-line basis |  |
Useful life |  | 2.5 years |  |

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