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Property and Equipment | 12 Months Ended
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Dec. 31, 2019
Property Plant And Equipment [Abstract] |
Property and Equipment |
(3) | Property and Equipment
Depreciation and amortization of property and equipment is calculated on the straight-line method based on estimated useful lives of six to ten years for tenant improvements and three to fifteen years for all other property and equipment. Property and equipment consist of the following at December 31(in thousands):
|  | 2019 |  |  | 2018 |
Computers and software |  | $ | 572 |  |  | $ | 361 |
Furniture, fixtures, and equipment |  |  | 299 |  |  |  | 339 |
Manufacturing and testing equipment |  |  | 3,444 |  |  |  | 2,503 |
Leasehold improvements |  |  | 911 |  |  |  | 895 |
|  |  | 5,226 |  |  |  | 4,098 |
Less accumulated depreciation |  |  | (3,118 | ) |  |  | (2,697 | )
|  | $ | 2,108 |  |  | $ | 1,401 |
Depreciation expense was $493,000, $587,000, and $436,000 for the years ended December 31, 2019, 2018, and 2017, respectively. For the year ended December 31, 2018, the Company incurred a $39,000 loss on disposals of fixed assets.

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- Definition The entire disclosure for intangible assets and long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 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 + Details
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