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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | PROPERTY, PLANT AND EQUIPMENT Presented in the table below are the major classes of property, plant and equipment by category as of the below dates:
| As of December 31, 2022
(in thousands) | Cost |  | Accumulated Depreciation |  | Net Book Value
Building | $ | 12,534 |  |  | $ | 1,016 |  |  | $ | 11,518 |
Machinery and equipment | 23,728 |  |  | 6,674 |  |  | 17,054 |
Leasehold improvements | 2,957 |  |  | 803 |  |  | 2,154 |
Fixtures and furnishings | 529 |  |  | 83 |  |  | 446 |
Land improvements | 150 |  |  | 22 |  |  | 128 |
Land | 1,150 |  |  | — |  |  | 1,150 |
Construction in process | 473,269 |  |  | — |  |  | 473,269 |
Total property, plant and equipment | $ | 514,317 |  |  | $ | 8,598 |  |  | $ | 505,719 |
| As of December 31, 2021
(in thousands) | Cost |  | Accumulated Depreciation |  | Net Book Value
Building | $ | 12,029 |  |  | $ | 695 |  |  | $ | 11,334 |
Machinery and equipment | 20,016 |  |  | 4,183 |  |  | 15,833 |
Leasehold improvements | 2,902 |  |  | 154 |  |  | 2,748 |
Fixtures and furnishings | 104 |  |  | 37 |  |  | 67 |
Land improvements | 150 |  |  | 12 |  |  | 138 |
Land | 1,150 |  |  | — |  |  | 1,150 |
Construction in process | 193,944 |  |  | — |  |  | 193,944 |
Total property, plant and equipment | $ | 230,295 |  |  | $ | 5,081 |  |  | $ | 225,214 |
Depreciation expense is recorded within operating costs in the consolidated statements of comprehensive loss and amounted to $3.6 million, $2.3 million, and $1.9 million for the years ended December 31, 2022, 2021, and 2020, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126982197&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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