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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Principal Balances    
Total debt $ 37,032 $ 85,797
Less amounts due within one year (11,078) (3,631)
Total long-term debt 25,954 82,166
Unamortized Debt Financing Costs    
Total debt 79 117
Less amounts due within one year (25) (39)
Total long-term debt 54 78
Balance, Net of Financing Costs    
Total debt 36,953 85,680
Less amounts due within one year (11,053) (3,592)
Total long-term debt 25,900 82,088
bp Loan    
Principal Balances    
Total debt   50,000
Balance, Net of Financing Costs    
Total debt   50,000
NG Advantage debt    
Principal Balances    
Total debt 26,638 29,535
Unamortized Debt Financing Costs    
Total debt 79 117
Balance, Net of Financing Costs    
Total debt 26,559 29,418
SG Facility    
Principal Balances    
Total debt 9,500 5,100
Balance, Net of Financing Costs    
Total debt 9,500 5,100
Other debt    
Principal Balances    
Total debt 894 1,162
Balance, Net of Financing Costs    
Total debt $ 894 $ 1,162