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Interest and Finance Costs - 6K (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Interest and Finance Costs [Abstract]          
Interest on long-term debt $ 5,008 $ 241 $ 1,353 $ 811 $ 5,075
Amortization of debt issuance costs 186 23 72 0 1,090
Other 11 16 35 10 80
Total 5,205 280 1,460 1,463 8,389
Interest and Finance Costs - Related Party [Abstract]          
Convertible notes interest expense 924 119 265 0 0
Convertible notes amortization of debt discount 688 227 334 0 0
Gain on extinguishment of convertible notes 0 (200) (200) 0 0
Total $ 1,612 $ 146 $ 399 $ 0 $ 0