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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment consists of the following (in thousands):
| December 31,
| 2020 |  | 2019
Building and leasehold improvements | $ | 92,977 |  |  | $ | 93,097 |
Laboratory equipment | 40,121 |  |  | 36,623 |
Computer equipment and software | 28,684 |  |  | 26,910 |
Manufacturing equipment | 21,796 |  |  | 22,030 |
Furniture, fixtures, and other | 9,872 |  |  | 9,662 |
Depreciable property, plant and equipment at cost | 193,450 |  |  | 188,322 |
Less: accumulated depreciation | (138,488) |  |  | (127,875) |
Depreciable property, plant and equipment, net | 54,962 |  |  | 60,447 |
Construction-in-progress | 4,700 |  |  | 5,218 |
Property, plant and equipment, net | $ | 59,662 |  |  | $ | 65,665 |
Building and leasehold improvements include our manufacturing, research and development and administrative facilities and the related improvements to these facilities. Laboratory and manufacturing equipment include assets that support both our manufacturing and research and development efforts. Construction-in-progress includes assets being built to enhance our manufacturing and research and development efforts. Depreciation and amortization expense on property, plant and equipment for the years ended December 31, 2020, 2019, and 2018 was $12.5 million, $11.0 million, and $8.8 million, 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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