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Vessels, Net - Schedule of Vessels (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Beginning balance $ 87,507    
Depreciation (4,418) $ (5,320) $ (5,500)
Additions 685 625  
Ending balance 83,774 87,507  
Vessel Cost [Member]      
Property, Plant and Equipment [Line Items]      
Beginning balance 108,523 134,310  
Depreciation  
Additions 685 625  
Reclassification of vessel as held-for-sale   (26,412)  
Ending balance 109,208 108,523 134,310
Accumulated Depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Beginning balance (21,016) (26,318)  
Depreciation (4,418) (5,320)  
Additions  
Reclassification of vessel as held-for-sale   10,622  
Ending balance (25,434) (21,016) (26,318)
Net Book Value [Member]      
Property, Plant and Equipment [Line Items]      
Beginning balance 87,507 107,992  
Depreciation (4,418) (5,320)  
Additions 685 625  
Reclassification of vessel as held-for-sale   (15,790)  
Ending balance $ 83,774 $ 87,507 $ 107,992