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Income Taxes - Reconciliation of Differences between Federal Statutory and Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
At statutory rate	$ (473)	$ (821)	$ (12,535)
State taxes, net of U.S. federal benefit	(1,554)	(162)	(757)
Current portion of long-term debt	305	0	0
Federal tax deductions	(3,231)	(3,299)	357
Change in applicable tax rate	(436)	26	286
Provision to return permanent difference	(810)	(17)	340
R&D credits	(149)	(209)	67
Fuel tax credit	(181)	(142)	(125)
Unrecognized tax benefits	0	70	2,163
NOL carryback/carryforward	(714)	14	1,186
Nondeductible asset basis	342	909	0
Compensation deduction limitation	0	426	0
Total income tax benefit	$ (6,901)	$ (3,205)	$ (9,017)

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