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Transactions with Related Parties, Loan Agreement (Details)
$ in Thousands
1 Months Ended 2 Months Ended 12 Months Ended
Mar. 28, 2017
USD ($)
Payment
Dec. 21, 2016
shares
Dec. 14, 2016
USD ($)
Dec. 13, 2016
shares
Nov. 23, 2016
shares
Oct. 04, 2016
USD ($)
Payment
Aug. 10, 2016
shares
Oct. 21, 2015
shares
Sep. 29, 2015
shares
Sep. 11, 2015
shares
Mar. 12, 2015
shares
Oct. 21, 2015
shares
Apr. 03, 2017
shares
Dec. 31, 2016
Nov. 28, 2016
USD ($)
Loan Agreement [Abstract]                              
Issuance of common stock and warrants (in shares) | shares   1,300,000   10,000,000 1,305,000   1,180,000                
Subsequent Event [Member]                              
Loan Agreement [Abstract]                              
Issuance of common stock and warrants (in shares) | shares                         2,019,675    
Jelco [Member]                              
Loan Agreement [Abstract]                              
Issuance of common stock and warrants (in shares) | shares               3,476,520 2,655,740 3,889,980 5,000,100 10,022,240      
Jelco [Member] | Loan Agreement Dated October 4, 2016 [Member]                              
Loan Agreement [Abstract]                              
Face amount           $ 4,150                 $ 12,800
Number of bullet payments | Payment           1                  
Prepayment necessary to decrease margin on variable rate           $ 5,000                  
Percentage of net offering proceeds required to be paid upon completion of public offering           25.00%                  
Prepayment necessary upon delivery of M/V Knightship           $ 1,900                  
Prepayment made upon delivery of M/V Knightship     $ 1,900                        
Prepayment made upon completion of public offering     5,000                        
Mandatory prepayment made based on percentage of net offering proceeds     3,430                        
Voluntary prepayment made     $ 1,570                        
Jelco [Member] | Loan Agreement Dated October 4, 2016 [Member] | LIBOR [Member]                              
Loan Agreement [Abstract]                              
Decrease in margin on variable rate if prepayment is made     2.00%     2.00%                  
Increase in margin on variable rate if maturity date is extended           1.50%                  
Margin on variable rate     7.00%                        
Jelco [Member] | Loan Agreement Dated October 4, 2016 [Member] | Minimum [Member]                              
Loan Agreement [Abstract]                              
Maturity date                           Feb. 28, 2018  
Number of months maturity date can be extended from final drawdown date                           14 months  
Jelco [Member] | Loan Agreement Dated October 4, 2016 [Member] | Maximum [Member]                              
Loan Agreement [Abstract]                              
Maturity date                           Feb. 28, 2019  
Number of months maturity date can be extended from final drawdown date                           26 months  
Jelco [Member] | Jelco Backstop Facility [Member] | Subsequent Event [Member]                              
Loan Agreement [Abstract]                              
Number of bullet payments | Payment 1                            
Borrowing capacity $ 47,500                            
Jelco [Member] | Jelco Backstop Facility [Member] | Subsequent Event [Member] | LIBOR [Member]                              
Loan Agreement [Abstract]                              
Margin on variable rate 7.00%