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Subsequent Events - 6K (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 9 Months Ended | 12 Months Ended |  |  |
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Nov. 30, 2016 USD ($) t | Nov. 28, 2016 USD ($) Installment Extension | Nov. 23, 2016 USD ($) $ / shares shares | Aug. 10, 2016 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2013 USD ($) | Oct. 28, 2016 $ / shares | Oct. 04, 2016 USD ($) | Sep. 26, 2016 Vessel
Secured Loan Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from draw down |  |  |  |  | $ 0 | $ 47,813 | $ 179,047 | $ 0 | $ 0 |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.0001 |  | $ 0.0001 | $ 0.0001 |  |  |  |
Issuance of common stock (in shares) | shares |  |  |  | 1,180,000 |  |  |  |  |  |  |  |
Price per share (in dollars per share) | $ / shares |  |  |  | $ 4.15 |  |  |  |  |  |  |  |
Net proceeds from direct offering |  |  |  | $ 4,080 | $ 4,080 | 10,691 | $ 13,820 | $ 3,204 | 0 |  |  |
Vessel Acquisition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquired vessel |  |  |  |  | $ 0 | $ 63,424 | $ 201,684 | $ 0 | $ 0 |  |  |
Capesize Vessel [Member] |  |  |  |  |  |  |  |  |  |  |  |
Secured Loan Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels to be acquired | Vessel |  |  |  |  |  |  |  |  |  |  |  | 2
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |
Issuance of common stock (in shares) | shares |  |  | 1,305,000 |  |  |  |  |  |  |  |  |
Price per share (in dollars per share) | $ / shares |  |  | $ 2.75 |  |  |  |  |  |  |  |  |
Net proceeds from direct offering |  |  | $ 3,200 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Jelco Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Secured Loan Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 4,150 |
Maximum borrowing capacity |  | $ 12,800 |  |  |  |  |  |  |  |  |  |
Proceeds from draw down |  | 8,650 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | NSF Secured Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Secured Loan Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  | 32,000 |  |  |  |  |  |  |  |  |  |
Proceeds from draw down |  | $ 7,500 |  |  |  |  |  |  |  |  |  |
Interest rate |  | 11.00% |  |  |  |  |  |  |  |  |  |
Number of consecutive payment installments | Installment |  | 4 |  |  |  |  |  |  |  |  |  |
Frequency of periodic payment |  | Quarterly |  |  |  |  |  |  |  |  |  |
Installment payment |  | $ 900 |  |  |  |  |  |  |  |  |  |
Balloon payment |  | $ 28,400 |  |  |  |  |  |  |  |  |  |
Initial termination date |  | Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |
Term of extension |  | 1 year |  |  |  |  |  |  |  |  |  |
Extension fee percentage |  | 1.75% |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | NSF Secured Term Loan Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Secured Loan Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of allowed extensions | Extension |  | 1 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | NSF Secured Term Loan Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Secured Loan Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of allowed extensions | Extension |  | 2 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Lordship [Member] |  |  |  |  |  |  |  |  |  |  |  |
Vessel Acquisition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Dead weight tonnage | t | 178,838 |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquired vessel | $ 3,000 |  |  |  |  |  |  |  |  |  |  |
Margin on index-linked charter rate | 6.00% |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Lordship [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Vessel Acquisition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Term of charter for acquired vessel | 11 months |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Lordship [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Vessel Acquisition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Term of charter for acquired vessel | 13 months |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Lordship [Member] | Jelco Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Vessel Acquisition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Loan issued for acquired vessel | $ 10,250 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Lordship [Member] | NSF Secured Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Vessel Acquisition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Loan issued for acquired vessel | $ 7,500 |  |  |  |  |  |  |  |  |  |  |

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