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Long-Term Debt, net - Annual loan principal payments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]    
Loan Balance $ 34,250 $ 37,000
CiT Bank N.A. loan facility [member]    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 34,250  
Later than one year and not later than two years [member] | CiT Bank N.A. loan facility [member]    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 5,000  
Later than two year and not later than three years [member] | CiT Bank N.A. loan facility [member]    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 5,000  
Later than three year and not later than four years [member] | CiT Bank N.A. loan facility [member]    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 5,000  
Later than four year and not later than five years [member] | CiT Bank N.A. loan facility [member]    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 5,000  
Later than five year and not later than six years [member] | CiT Bank N.A. loan facility [member]    
Disclosure of detailed information about borrowings [line items]    
Loan Balance $ 14,250