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Property and Equipment, Net (Tables) | 9 Months Ended
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Sep. 30, 2021
Property, Plant and Equipment [Abstract] |
Summary of Property and Equipment | Property and equipment consisted of the following (in thousands):
| September 30, 2021 |  | December 31, 2020
Leasehold improvements | $ | 8,745 |  |  | $ | 6,010 |
Laboratory and clean room equipment | 16,497 |  |  | 15,524 |
Furniture and equipment | 14,944 |  |  | 15,295 |
Construction in progress | 677 |  |  | 3,321 |
Asset retirement cost | 880 |  |  | 785 |
Finance lease assets | 189 |  |  | — |
Property and equipment, gross | 41,932 |  |  | 40,935 |
Less accumulated depreciation | (32,076) |  |  | (29,498) |
Property and equipment, net | $ | 9,856 |  |  | $ | 11,437 |
Schedule of Depreciation Expense | Depreciation expense for each of the three and nine months ended September 30, 2021 and 2020 is summarized in the table below (amounts in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Depreciation expense | $ | 923 |  |  | $ | 1,566 |  |  | $ | 3,390 |  |  | $ | 4,494 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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