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Property and Equipment, Net | 12 Months Ended
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Dec. 31, 2021
Property Plant And Equipment [Abstract] |
Property and Equipment, Net |
6. | Property and Equipment, Net
Property and equipment, net as of December 31, 2021 and 2020 consisted of the following (in thousands):
|  | December 31, |
|  | 2021 |  |  | 2020 |
Laboratory equipment |  | $ | 36,312 |  |  | $ | 27,767 |
Computer equipment |  |  | 6,988 |  |  |  | 3,600 |
Furniture and office equipment |  |  | 5,579 |  |  |  | 2,717 |
Computer software |  |  | 992 |  |  |  | 860 |
Construction in progress |  |  | 5,658 |  |  |  | 7,185 |
Leasehold improvements |  |  | 65,959 |  |  |  | 21,945 |
Property and equipment, at cost |  |  | 121,488 |  |  |  | 64,074 |
Less: Accumulated depreciation |  |  | (36,226 | ) |  |  | (24,382 | )
Property and equipment, net |  | $ | 85,262 |  |  | $ | 39,692 |
Depreciation expense was $12.3 million, $6.8 million and $6.1 million for the year ended December 31, 2021, 2020 and 2019, 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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