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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 | 4. Property and Equipment Property and equipment consist of the following (in thousands):
|  | Estimated Useful |  |  | December 31, |
|  | Life (Years) |  |  | 2019 |  |  | 2018 |
Land |  |  | — |  |  | $ | 875 |  |  | $ | 875 |
Buildings |  | 39-40 |  |  |  | 17,389 |  |  |  | 17,389 |
Building improvements |  | 5-40 |  |  |  | 37,543 |  |  |  | 34,967 |
Machinery and equipment |  | 3-15 |  |  |  | 54,982 |  |  |  | 61,217 |
Furniture, fixtures and office equipment |  | 5-10 |  |  |  | 3,005 |  |  |  | 2,954 |
Computer equipment and software |  |  | 3 |  |  |  | 8,234 |  |  |  | 8,355 |
Construction in progress |  |  | — |  |  |  | 114 |  |  |  | 342 |
|  |  |  |  |  |  | 122,142 |  |  |  | 126,099 |
Less accumulated depreciation |  |  |  |  |  |  | (95,364 | ) |  |  | (100,497 | )
Total property and equipment, net |  |  |  |  |  | $ | 26,778 |  |  | $ | 25,602 |
Depreciation expense related to property and equipment for the years ended December 31, 2019 and 2018 was $1.6 million and $1.7 million, respectively. During the year ended December 31, 2019, the Company retired $6.7 million of manufacturing equipment and computer hardware as it was no longer in service. During the year ended December 31, 2018, the Company disposed of $2.1 million of furniture and fixtures, manufacturing equipment and laboratory equipment as it was no longer in service. The net book value for the disposed assets was de minimis.

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- Definition The entire disclosure for 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 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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