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Discontinued Operations - Summary of net loss from discontinued operations (Details) - USD ($) | 12 Months Ended
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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)

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