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Vessels, Net, Acquisitions - 20F (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 10, 2016 USD ($) shares | Dec. 07, 2015 USD ($) | Nov. 10, 2015 USD ($) | Nov. 03, 2015 USD ($) | Oct. 21, 2015 USD ($) shares | Oct. 13, 2015 USD ($) | Sep. 29, 2015 USD ($) shares | Sep. 11, 2015 USD ($) shares | Aug. 06, 2015 Vessel | Mar. 19, 2015 USD ($) t | Mar. 18, 2015 USD ($) shares | Dec. 23, 2014 t | Sep. 30, 2016 USD ($) t | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Vessel t | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Vessels, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity injection for vessel acquired | $ 4,080 |  |  |  |  |  |  |  |  |  |  |  | $ 4,080 | $ 10,691 | $ 13,820 | $ 3,204 | $ 0
Shares issued to finance vessels acquired (in shares) | shares | 1,180,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels | Vessel |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |
Leadership [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dead weight tonnage | t |  |  |  |  |  |  |  |  |  | 171,199 |  | 171,199 |  |  |  |  |
Purchase price of vessel |  |  |  |  |  |  |  |  |  | $ 17,127 |  |  |  |  |  |  |
Loan issued for acquired vessel |  |  |  |  |  |  |  |  |  | 8,750 |  |  |  |  |  |  |
Convertible promissory note issued for vessel acquired |  |  |  |  |  |  |  |  |  | $ 3,827 |  |  |  |  |  |  |
Equity injection for vessel acquired |  |  |  |  |  |  |  |  |  |  | $ 4,550 |  |  |  |  |  |
Shares issued to finance vessels acquired (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 5,000,100 |  |  |  |  |  |
Premiership [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dead weight tonnage | t |  |  |  |  |  |  |  |  |  |  |  |  | 170,024 |  | 170,024 |  |
Purchase price of vessel |  |  |  |  |  |  |  | $ 29,951 |  |  |  |  |  |  |  |  |
Loan issued for acquired vessel |  |  |  |  |  |  |  | 25,420 |  |  |  |  |  |  |  |  |
Convertible promissory note issued for vessel acquired |  |  |  |  |  |  |  | 1,030 |  |  |  |  |  |  |  |  |
Equity injection for vessel acquired |  |  |  |  |  |  |  | $ 3,501 |  |  |  |  |  |  |  |  |
Shares issued to finance vessels acquired (in shares) | shares |  |  |  |  |  |  |  | 3,889,980 |  |  |  |  |  |  |  |  |
Gladiatorship [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dead weight tonnage | t |  |  |  |  |  |  |  |  |  |  |  |  | 56,819 |  | 56,819 |  |
Purchase price of vessel |  |  |  |  |  |  | $ 16,336 |  |  |  |  |  |  |  |  |  |
Loan issued for acquired vessel |  |  |  |  |  |  | 13,643 |  |  |  |  |  |  |  |  |  |
Convertible promissory note issued for vessel acquired |  |  |  |  |  |  | 303 |  |  |  |  |  |  |  |  |  |
Equity injection for vessel acquired |  |  |  |  |  |  | $ 2,390 |  |  |  |  |  |  |  |  |  |
Shares issued to finance vessels acquired (in shares) | shares |  |  |  |  |  |  | 2,655,740 |  |  |  |  |  |  |  |  |  |
Geniuship [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dead weight tonnage | t |  |  |  |  |  |  |  |  |  |  |  |  | 170,057 |  | 170,057 |  |
Purchase price of vessel |  |  |  |  |  | $ 27,597 |  |  |  |  |  |  |  |  |  |  |
Guardianship [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dead weight tonnage | t |  |  |  |  |  |  |  |  |  |  |  |  | 56,884 |  | 56,884 |  |
Purchase price of vessel |  |  |  |  | $ 17,168 |  |  |  |  |  |  |  |  |  |  |  |
Loan issued for acquired vessel |  |  |  |  | 13,642 |  |  |  |  |  |  |  |  |  |  |  |
Convertible promissory note issued for vessel acquired |  |  |  |  | 397 |  |  |  |  |  |  |  |  |  |  |  |
Equity injection for vessel acquired |  |  |  |  | $ 3,129 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to finance vessels acquired (in shares) | shares |  |  |  |  | 3,476,520 |  |  |  |  |  |  |  |  |  |  |  |
Gloriuship [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dead weight tonnage | t |  |  |  |  |  |  |  |  |  |  |  |  | 171,314 |  | 171,314 |  |
Purchase price of vessel |  |  |  | $ 16,833 |  |  |  |  |  |  |  |  |  |  |  |  |
Squireship [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dead weight tonnage | t |  |  |  |  |  |  |  |  |  |  |  |  | 170,018 |  | 170,018 |  |
Purchase price of vessel |  |  | $ 34,922 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan issued for acquired vessel |  |  | 33,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible promissory note issued for vessel acquired |  |  | $ 1,172 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Championship [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dead weight tonnage | t |  |  |  |  |  |  |  |  |  |  |  |  | 179,238 |  | 179,238 |  |
Purchase price of vessel |  | $ 41,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan issued for acquired vessel |  | 39,412 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible promissory note issued for vessel acquired |  | $ 2,338 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dry Bulk Vessel [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels | Vessel |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |
Capesize Vessel [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels | Vessel |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |
Supramax Vessel [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels | Vessel |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |

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