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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | 10. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are summarized below:
|  | December 31, |
|  | 2020 |  |  | 2019 |
Machinery and equipment |  | $ | 1,210 |  |  | $ | 1,225 |
Furniture and fixtures |  |  | 205 |  |  |  | 205 |
Computer hardware and software |  |  | 669 |  |  |  | 682 |
Leasehold improvements |  |  | 337 |  |  |  | 337 |
|  |  | 2,421 |  |  |  | 2,449 |
Less: Accumulated depreciation |  |  | (1,988 | ) |  |  | (1,809 | )
Total property, plant and equipment, net |  | $ | 433 |  |  | $ | 640 |
Depreciation expense was $203 and $269 for the period ended December 31, 2020 and 2019, 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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