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PROPERTY, PLANT AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2025
Property, Plant and Equipment [Abstract] |
Schedule of Property, Plant and Equipment | Property, plant and equipment are recorded at cost and are depreciated over their estimated useful lives, unless the useful life is indefinite, using the straight-line method over the following estimated useful lives:
Buildings |  | 10 - 40 years
Machinery and equipment |  | 3 - 30 years
Leasehold improvements |  | 2 - 5 years
Fixtures and furnishings |  | 5 - 7 years
Land improvements |  | 15 years
Land |  | Indefinite
Presented in the table below are the major classes of property, plant and equipment by category as of the below dates:
|  | Year Ended December 31, 2025 |
(in thousands) |  | Cost |  |  | Accumulated Depreciation |  |  | Net Book Value |
Buildings |  | $ | 84,757 |  |  | $ | 7,046 |  |  | $ | 77,711 |
Machinery and equipment |  |  | 386,572 |  |  |  | 73,401 |  |  |  | 313,171 |
Leasehold improvements |  |  | 4,829 |  |  |  | 2,959 |  |  |  | 1,870 |
Fixtures and furnishings |  |  | 764 |  |  |  | 383 |  |  |  | 381 |
Land improvements |  |  | 150 |  |  |  | 52 |  |  |  | 98 |
Land |  |  | 1,150 |  |  |  | — |  |  |  | 1,150 |
Construction in progress |  |  | 263,371 |  |  |  | — |  |  |  | 263,371 |
Total property, plant and equipment |  | $ | 741,593 |  |  | $ | 83,841 |  |  | $ | 657,752 |
|  | Year Ended December 31, 2024 |
(in thousands) |  | Cost |  |  | Accumulated Depreciation |  |  | Net Book Value |
Buildings |  | $ | 82,026 |  |  | $ | 4,843 |  |  | $ | 77,183 |
Machinery and equipment |  |  | 374,639 |  |  |  | 48,452 |  |  |  | 326,187 |
Leasehold improvements |  |  | 4,829 |  |  |  | 2,150 |  |  |  | 2,679 |
Fixtures and furnishings |  |  | 800 |  |  |  | 286 |  |  |  | 514 |
Land improvements |  |  | 150 |  |  |  | 42 |  |  |  | 108 |
Land |  |  | 1,150 |  |  |  | — |  |  |  | 1,150 |
Construction in progress |  |  | 266,258 |  |  |  | — |  |  |  | 266,258 |
Total property, plant and equipment |  | $ | 729,852 |  |  | $ | 55,773 |  |  | $ | 674,079 |
Summary of Depreciation Expense | Depreciation expense is recorded in the Consolidated Statements of Comprehensive Loss as follows:
|  | Year Ended December 31, |
(in thousands) |  | 2025 |  |  | 2024 |  |  | 2023 |
Operating costs |  | $ | 25,876 |  |  | $ | 27,691 |  |  | $ | 12,289 |
Research and development costs |  |  | 3,095 |  |  |  | 3,058 |  |  |  | 3,001 |
Selling, general, and administrative costs |  |  | 149 |  |  |  | 571 |  |  |  | 645 |
Total depreciation expense |  | $ | 29,120 |  |  | $ | 31,320 |  |  | $ | 15,935 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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