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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, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
At statutory rate	$ 53	$ (473)	$ (821)
State taxes, net of U.S. federal benefit	(176)	(1,554)	(162)
Current portion of long-term debt	189	305	0
Federal tax deductions	(3,507)	(3,231)	(3,299)
Change in applicable tax rate	8	(436)	26
Provision to return permanent difference	4	(810)	(17)
R&D credits	(166)	(149)	(209)
Fuel tax credit	(226)	(181)	(142)
Unrecognized tax benefits	0	0	70
NOL carryback/carryforward	1,265	(714)	14
Nondeductible asset basis	(184)	342	909
Compensation deduction limitation	0	0	426
Total income tax benefit	$ (2,740)	$ (6,901)	$ (3,205)

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