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7. PROPERTY AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2022
Property Plant And Equipment Abstract |
7. PROPERTY AND EQUIPMENT | 7. PROPERTY AND EQUIPMENT Property and equipment consists of the following (in thousands):
|  | December 31, |
|  | 2022 |  |  | 2021 |
Production equipment |  | $ | 6,140 |  |  | $ | 8,224 |
Leasehold improvements |  |  | 3,789 |  |  |  | 913 |
Computer hardware and software/lab equipment |  |  | 10,515 |  |  |  | 7,230 |
Office furniture and equipment |  |  | 1,804 |  |  |  | 1,372 |
|  |  | 22,248 |  |  |  | 17,739 |
Less: Accumulated depreciation |  |  | (15,418 | ) |  |  | (14,713 | )
|  | $ | 6,830 |  |  | $ | 3,026 |
Depreciation expense was $705,000 in 2022, $902,000 in 2021 and $442,000 in 2020.

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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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