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Property and Equipment | 6 Months Ended
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Jun. 30, 2021
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and Equipment Property and equipment consisted of the following (in thousands):
| June 30, 2021 |  | December 31, 2020
Leasehold improvements | $ | 8,039 |  |  | $ | 6,010 |
Laboratory and clean room equipment | 15,424 |  |  | 15,524 |
Furniture and equipment | 15,062 |  |  | 15,295 |
Construction in progress | 1,972 |  |  | 3,321 |
Asset retirement cost | 860 |  |  | 785 |
Finance lease assets | 189 |  |  | — |
Property and equipment, gross | 41,546 |  |  | 40,935 |
Less accumulated depreciation | (31,273) |  |  | (29,498) |
Property and equipment, net | $ | 10,273 |  |  | $ | 11,437 |
Depreciation expense for each of the three and six months ended June 30, 2021 and 2020 is summarized in the table below (amounts in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Depreciation expense | $ | 1,306 |  |  | $ | 1,422 |  |  | $ | 2,467 |  |  | $ | 2,928 |
Depreciation expense is allocated amongst cost of sales, research and development, and selling, general, and administrative expense on the unaudited condensed consolidated statements of operations.

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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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