Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Principal Balances
Total debt	$ 32,528	$ 36,132
Less amounts due within one year	(7,357)	(12,868)
Total long-term debt	25,171	23,264
Unamortized Debt Financing Costs
Total debt	118	72
Less amounts due within one year	(36)	(23)
Total long-term debt	82	49
Balance, Net of Financing Costs
Total debt	32,410	36,060
Less amounts due within one year	(7,321)	(12,845)
Total long-term debt	25,089	23,215
NG Advantage debt
Principal Balances
Total debt	27,414	25,832
Unamortized Debt Financing Costs
Total debt	118	72
Balance, Net of Financing Costs
Total debt	27,296	25,760
SG Facility
Principal Balances
Total debt	4,500	9,500
Balance, Net of Financing Costs
Total debt	4,500	9,500
Other debt
Principal Balances
Total debt	614	800
Balance, Net of Financing Costs
Total debt	$ 614	$ 800