Discontinued Operations - Net income (loss) from discontinued operation by discontinued operation (Details) - Discontinued Operations - Drivetrain Disposal Group - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 16	$ 21
Operating expenses:
Cost of revenues - operations and maintenance	20	22
Net loss from discontinued operations	$ (4)	$ (1)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.