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Long-Term Debt, Net - DVB Loan Agreement (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2011	Jun. 30, 2011
Disclosure of detailed information about borrowings [line items]
Cash and cash equivalents	$ 1,588	$ 2,756	$ 826	$ 163
DVB Bank
Disclosure of detailed information about borrowings [line items]
Loan Facility, Maximum borrowing capacity						$ 40,000
DVB Bank | Minimum
Disclosure of detailed information about borrowings [line items]
Compensating Balance, Amount per vessel					$ 1,000
Market adjusted net worth to total assets ratio	21.00%				35.00%
Market adjusted net worth	$ 12,288				$ 50,000
Compensating Balance, Amount	$ 5,000				$ 10,000

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- Definition

The amount of a specific compensating balance arrangement that is maintained, under an agreement for a bank loan.

+ References

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- Definition

The amount of a specific compensating balance arrangement that is maintained per vessel, under an agreement for a bank loan.

+ References

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

The company's market adjusted net worth.

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- Definition

The ratio of the market adjusted net worth to total assets.

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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2018-01-01
-Paragraph 45
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2018-01-01
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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