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PROPERTY, PLANT AND EQUIPMENT | 9 Months Ended
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Sep. 30, 2021
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | 7. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are summarized below:
|  | September 30, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Machinery and equipment |  | $ | 1,183 |  |  | $ | 1,210 |
Furniture and fixtures |  |  | 205 |  |  |  | 205 |
Computer hardware and software |  |  | 539 |  |  |  | 669 |
Leasehold improvements |  |  | 322 |  |  |  | 337 |
Construction in progress |  |  | 141 |  |  |  | — |
|  |  | 2,390 |  |  |  | 2,421 |
Less: accumulated depreciation |  |  | (1,912 | ) |  |  | (1,988 | )
Total property, plant and equipment, net |  | $ | 478 |  |  | $ | 433 |
Depreciation expense was $35 and $50 for the three months ended September 30, 2021 and 2020, respectively. Depreciation expense was $110 and $164 for the nine months ended September 30, 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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://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 http://asc.fasb.org/extlink&oid=120429125&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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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