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ASSETS AND LIABILITIES HELD FOR SALE AND DISCONTINUED OPERATIONS - Major Classes of Assets and Liabilities in Balance Sheets (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | [1]
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash | $ 1,900 | [1] | $ 3,500 | $ 12,900
Total current assets | 42,330 |  | 43,554 |
Accrued warranty expense | 1,174 |  | 1,176 |
Total current liabilities | 52,269 |  | 54,396 |
Discontinued Operations, Held-for-sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash | 1,863 |  | 3,455 |
Accounts receivable – trade, net | 7,595 |  | 10,016 |
Contracts in progress | 19,942 |  | 14,180 |
Inventories, net | 2,725 |  | 2,365 |
Other current assets | 4,858 |  | 461 |
Total current assets | 36,983 |  | 30,477 |
Net property, plant and equipment and finance leases | 3,081 |  | 3,370 |
Intangible assets, net | 219 |  | 8,044 |
Right-of-use assets | 1,374 |  | 1,411 |
Other assets | 673 |  | 252 |
Total noncurrent assets | 5,347 |  | 13,077 |
Total assets held for sale | 42,330 |  | 43,554 |
Accounts payable | 37,850 |  | 36,345 |
Accrued employee benefits | 585 |  | 518 |
Advance billings on contracts | 4,132 |  | 6,816 |
Accrued warranty expense | 1,983 |  | 2,021 |
Operating lease liabilities | 313 |  | 314 |
Other accrued liabilities | 5,328 |  | 4,694 |
Current borrowings | 447 |  | 511 |
Total current liabilities | 50,638 |  | 51,219 |
Borrowings, net of current portion | 561 |  | 874 |
Operating lease liabilities, net of current portion | 1,070 |  | 1,104 |
Other noncurrent liabilities |  |  | 1,199 |
Total noncurrent liabilities | 1,631 |  | 3,177 |
Total liabilities held for sale | 52,269 |  | 54,396 |
Solar | Discontinued Operations, Held-for-sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash | 526 |  | 1,255 |
Accounts receivable – trade, net | 1,273 |  | 2,814 |
Contracts in progress | 11,649 |  | 4,157 |
Inventories, net | 0 |  | 0 |
Other current assets | 59 |  | 90 |
Total current assets | 13,507 |  | 8,316 |
Net property, plant and equipment and finance leases | 2,935 |  | 3,246 |
Intangible assets, net | 0 |  | 7,833 |
Right-of-use assets | 47 |  | 53 |
Other assets | 0 |  | 9 |
Total noncurrent assets | 2,982 |  | 11,141 |
Total assets held for sale | 16,489 |  | 19,457 |
Accounts payable | 28,487 |  | 30,365 |
Accrued employee benefits | 39 |  | 0 |
Advance billings on contracts | 393 |  | 961 |
Operating lease liabilities | 26 |  | 26 |
Other accrued liabilities | 2,282 |  | 4,504 |
Current borrowings | 447 |  | 511 |
Total current liabilities | 32,848 |  | 37,543 |
Borrowings, net of current portion | 561 |  | 874 |
Operating lease liabilities, net of current portion | 22 |  | 29 |
Other noncurrent liabilities |  |  | 1,199 |
Total noncurrent liabilities | 583 |  | 2,102 |
Total liabilities held for sale | 33,431 |  | 39,645 |
Vølund | Discontinued Operations, Held-for-sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash | 1,337 |  | 2,200 |
Accounts receivable – trade, net | 6,322 |  | 7,202 |
Contracts in progress | 8,293 |  | 10,023 |
Inventories, net | 2,725 |  | 2,365 |
Other current assets | 4,799 |  | 371 |
Total current assets | 23,476 |  | 22,161 |
Net property, plant and equipment and finance leases | 146 |  | 124 |
Intangible assets, net | 219 |  | 211 |
Right-of-use assets | 1,327 |  | 1,358 |
Other assets | 673 |  | 243 |
Total noncurrent assets | 2,365 |  | 1,936 |
Total assets held for sale | 25,841 |  | 24,097 |
Accounts payable | 9,363 |  | 5,980 |
Accrued employee benefits | 546 |  | 518 |
Advance billings on contracts | 3,739 |  | 5,855 |
Accrued warranty expense | 809 |  | 845 |
Operating lease liabilities | 287 |  | 288 |
Other accrued liabilities | 3,046 |  | 190 |
Current borrowings | 0 |  | 0 |
Total current liabilities | 17,790 |  | 13,676 |
Borrowings, net of current portion | 0 |  | 0 |
Operating lease liabilities, net of current portion | 1,048 |  | 1,075 |
Other noncurrent liabilities |  |  | 0 |
Total noncurrent liabilities | 1,048 |  | 1,075 |
Total liabilities held for sale | $ 18,838 |  | $ 14,751 |
[1] | Includes cash held at discontinued operations of $1.9 million and $12.9 million at March 31, 2025 and 2024, respectively.

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