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Long-Term Debt, Net - DVB Loan Agreement (Details) | 4 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2016 USD ($) | Jun. 30, 2011 USD ($) | Sep. 30, 2011 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2011 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  | $ 280,000 | $ 5,950,000 | $ 39,505,000 |
Repayments of borrowings |  |  |  | 4,399,000 | 3,100,000 | $ 45,506,000 |
Borrowings |  |  |  | 41,538,000 | 65,572,000 |  |
Pledged cash |  |  |  | 210,000 | 210,000 |  |
Current portion of long-term borrowings |  |  |  | $ 41,538,000 | $ 23,550,000 |  |
DVB Bank |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Loan Facility, Maximum borrowing capacity |  | $ 40,000,000 |  |  |  |  |
Repayments of borrowings | $ 1,713,000 |  |  |  |  |  |
Back-end fee |  |  |  | 0.75% |  |  |
Current portion of long-term borrowings |  |  |  | $ 16,702,000 |  |  |
DVB Bank | Tranche A |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Proceeds from borrowings |  | $ 19,000,000 |  |  |  |  |
Repayments of borrowings |  |  |  | 880,000 |  |  |
Borrowings |  |  |  | $ 8,380,000 |  |  |
Borrowings Number Of Periodic Payments |  |  |  | 3 |  |  |
Borrowings Frequency Of Periodic Payment |  |  |  | quarterly |  |  |
Periodic payment |  |  |  | $ 440,000 |  |  |
Balloon Payment to be Paid |  |  |  | $ 7,060,000 |  |  |
Borrowings, maturity |  |  |  | December 2018 |  |  |
Amount deferred to the last scheduled repayment date |  |  |  | $ 880,000 |  |  |
DVB Bank | Tranche B |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Proceeds from borrowings |  |  | $ 18,000,000 |  |  |  |
Repayments of borrowings |  |  |  | 833,000 |  |  |
Borrowings |  |  |  | $ 8,343,000 |  |  |
Borrowings Number Of Periodic Payments |  |  |  | 4 |  |  |
Borrowings Frequency Of Periodic Payment |  |  |  | quarterly |  |  |
Periodic payment |  |  |  | $ 416,250 |  |  |
Balloon Payment to be Paid |  |  |  | $ 6,678,000 |  |  |
Borrowings, maturity |  |  |  | March 2019 |  |  |
Amount deferred to the last scheduled repayment date |  |  |  | $ 833,000 |  |  |
DVB Bank | Minimum |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Fair value of mortgaged vessels to loan outstanding balance ratio |  |  |  | 50.00% | 50.00% |  | 130.00%
Compensating Balance, Amount per vessel |  |  |  | $ 1,000,000 |  |  | $ 1,000,000
Market adjusted net worth to total assets ratio |  |  |  | 35.00% | 35.00% |  | 35.00%
Market adjusted net worth |  |  |  | $ 50,000,000 | $ 50,000,000 |  | $ 50,000,000
Compensating Balance, Amount |  |  |  | $ 10,000,000 |  |  | 10,000,000
Pledged cash |  |  |  |  |  |  | 1,000,000
DVB Bank | Minimum | Vessel Owning Subsidiaries |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Pledged cash |  |  |  |  |  |  | $ 500,000
DVB Bank | From January 1, 2018 to June 30, 2018 | Minimum |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Fair value of mortgaged vessels to loan outstanding balance ratio |  |  |  | 105.00% |  |  |
DVB Bank | After June 30, 2018 | Minimum |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Fair value of mortgaged vessels to loan outstanding balance ratio |  |  |  | 130.00% |  |  |

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