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Discontinued Operations - Net income (loss) from discontinued operation by discontinued operation (Details) - Discontinued Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
XL Grid    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenues $ 149 $ 12,279
Operating expenses:    
Cost of revenues - inventory and other direct costs 148 8,577
Selling, general, and administrative expenses 743 4,794
Gain (loss) on asset disposal 742 0
Total operating expenses 149 13,371
Net loss from discontinued operations 0 (1,092)
Drivetrain    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Revenues 42 2,419
Operating expenses:    
Cost of revenues - inventory and other direct costs 106 14,038
Engineering, research, and development 0 9,819
Selling, general, and administrative expenses 0 8,041
Gain (loss) on asset disposal (4,071) (935)
Other (income) (12) 0
Total operating expenses 4,165 32,833
Net loss from discontinued operations $ (4,123) $ (30,414)