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9. PROPERTY AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
9. PROPERTY AND EQUIPMENT | 9. PROPERTY AND EQUIPMENT Property and equipment consists of the following (in thousands): Components of Property, Plant and Equipment
|  |  | December 31,
|  |  | 2021 |  |  | 2020
Production equipment |  | $ | 8,224 |  | $ | 7,210
Leasehold improvements |  |  | 913 |  |  | 913
Computer hardware and software/lab equipment |  |  | 7,230 |  |  | 6,226
Office furniture and equipment |  |  | 1,372 |  |  | 1,345
Property, gross |  |  | 17,739 |  |  | 15,694
Less: Accumulated depreciation |  |  | (14,713) |  |  | (13,811)
Property, net |  | $ | 3,026 |  | $ | 1,883
Depreciation expense was $902,000 in 2021, $442,000 in 2020 and $1.1 million in 2019.

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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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