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Property and Equipment | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and Equipment Property and equipment consists of the following as of December 31, 2021 and 2020:
| December 31, 2021 |  | December 31, 2020
Laboratory equipment | $ | 6,725 |  |  | $ | 6,520 |
Leasehold improvements | 1,906 |  |  | 1,886 |
Computer equipment and office equipment | 1,019 |  |  | 959 |
Total property and equipment at cost | 9,650 |  |  | 9,365 |
Less: Accumulated depreciation | (7,682) |  |  | (7,635) |
| $ | 1,968 |  |  | $ | 1,730 |
The Company recorded assets under finance leases of $609, $0, and $429 as property and equipment during the years ended December 31, 2021, 2020 and 2019, respectively. Financing leases are discussed in more detail in Note 10, Leases. Depreciation expense for the years ended December 31, 2021, 2020 and 2019 was $855, $1,010 and $1,245, 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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