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Basis of Preparation And Significant Accounting Policies (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 15 Months Ended
Mar. 31, 2018
USD ($)
Jun. 24, 2019
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Apr. 23, 2019
$ / shares
Nov. 30, 2018
USD ($)
$ / shares
Basis of Preparation and Significant Accounting Policies [line items]                      
Working capital deficit       $ (3,242)              
Accumulated deficit       (135,648) $ (99,297)            
Borrowing costs capitalised       $ 880 253 $ 0          
Number of Operating Segments       1              
Description of the nature of the benefits provided by the defined benefit plan       If the employee remains in the employment of the Company until normal retirement age, they are entitled to retirement compensation which is equal to 40% of the compensation amount that would be payable if they were dismissed at that time.              
Net defined benefit liability       $ 26 87            
Current portion of long-term borrowings       1,195 35,368            
Right of use asset       562 0            
Undrawn borrowing facilities       11,100 12,800            
Lease liability       800 0            
Depreciation charge for right-of-use assets       112 0 0          
Interest expense on lease liabilities       51 0 0          
Revenue from rendering of services       15,623 17,354 13,852          
Proceeds from borrowings       43,700 15,700 280          
Loan Balance       38,487 37,163            
Issuance of common stock due to conversion of loan       5,140              
Provision for doubtful trade receivables       23 68            
EnTrust                      
Basis of Preparation and Significant Accounting Policies [line items]                      
Borrowing costs capitalised       880              
Proceeds from borrowings   $ 37,000                  
Loan Balance       37,000              
Credit Facility, Maximum borrowing capacity                 $ 37,000    
Firment Shipping Inc.                      
Basis of Preparation and Significant Accounting Policies [line items]                      
Undrawn borrowing facilities       11,100 12,800            
Proceeds from borrowings       800 2,200            
Conversion price | $ / shares | $ / shares                   $ 2.8 $ 2.8
Credit Facility, Maximum borrowing capacity                     $ 15,000
Convertible Note                      
Basis of Preparation and Significant Accounting Policies [line items]                      
Loan Balance       3,579              
Issuance of common stock due to conversion of loan               $ 1,168      
Cyberonica S.A.                      
Basis of Preparation and Significant Accounting Policies [line items]                      
Right of use asset       $ 562 674            
Lease liability         674            
Incremental cost of borrowing       8.00%              
Depreciation charge for right-of-use assets       $ 112              
Interest expense on lease liabilities       51              
Time charters leases                      
Basis of Preparation and Significant Accounting Policies [line items]                      
Revenue from rendering of services       9,169              
Operating lease income       $ 6,454              
Deferred dry docking costs                      
Basis of Preparation and Significant Accounting Policies [line items]                      
Depreciation method       straight-line basis              
Interval between vessel drydockings / special surveys       2 years 6 months              
Vessels                      
Basis of Preparation and Significant Accounting Policies [line items]                      
Depreciation method       straight-line basis              
Vessels scrap rate $ 300   $ 250 $ 300     $ 200        
Increase / (decrease) in depreciation expense due to changes in scrap rates         $ (178) $ (86)          
Useful life       25 years              
Black-Scholes option pricing model                      
Basis of Preparation and Significant Accounting Policies [line items]                      
Expected Dividend Yield Significant Unobservable Inputs Liabilities       0.00% 0.00%            
Historical volatility for shares, significant unobservable inputs, liabilities       85.00% 80.00%            
Risk free rate       1.59% 2.48%            
Weighted average share price | $ / shares       $ 0.99 $ 2.88            
Expected life       0,89 years 1,89 years            
Monte Carlo simulation                      
Basis of Preparation and Significant Accounting Policies [line items]                      
Risk free rate       1.535%              
Closing stock price | $ / shares       $ 0.99              
Average logarithmic price change       (0.68%)              
Assumed expected volatility rate       5.31%              
Number of iterations       10,000              
Remaining trading days       50              
Floor price | $ / shares       $ 1