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PROPERTY AND EQUIPMENT, NET | 9 Months Ended
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Sep. 30, 2021
PROPERTY AND EQUIPMENT, NET |
PROPERTY AND EQUIPMENT, NET | NOTE G — PROPERTY AND EQUIPMENT, NET Property and equipment, net, as of the below dates consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Useful Life |  | ​ | ​ |  | ​ | ​
​ | ​ | In Years | ​ | September 30, 2021 | ​ | December 31, 2020
Tooling and equipment |  | 7 - 15 | ​ | $ | 13,400 | ​ | $ | 13,465
Furniture and other equipment |  | 5 | ​ |  | 7,785 | ​ |  | 7,379
Computer software |  | 5 | ​ |  | 1,987 | ​ |  | 2,378
Leasehold improvements |  | 3 - 6 | ​ |  | 3,467 | ​ |  | 3,314
Equipment under capital lease |  | 5 | ​ |  | 192 | ​ |  | 197
​ | ​ | ​ | ​ |  | 26,831 | ​ |  | 26,733
Less accumulated depreciation | ​ | ​ | ​ |  | (19,427) | ​ |  | (18,894)
​ | ​ | ​ | ​ | $ | 7,404 | ​ | $ | 7,839
​ Depreciation expense, which includes amortization of equipment under capital lease, amounted to $0.5 million and $0.5 million for the three months ended September 30, 2021 and 2020, respectively. Depreciation expense, which includes amortization of equipment under capital lease, amounted to $1.5 million and $1.6 million 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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