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Discontinued Operations - Summary of net loss from discontinued operations (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net loss from discontinued operations: $ (4,123,000) $ (40,112,000)
Impairment of goodwill 0 (8,600,000)
Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net loss from discontinued operations: (4,123,000) (40,112,000)
Impairment of goodwill 0 (8,606,000)
Discontinued Operations | XL Grid    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net loss from discontinued operations: 0 (1,092,000)
Discontinued Operations | Drivetrain    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net loss from discontinued operations: $ (4,123,000) $ (30,414,000)