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Property and Equipment, Net | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment [Abstract] |
Property and Equipment, Net | 7. Property and Equipment, Net Property and equipment, net as of December 31, 2023 and 2022 consisted of the following (in thousands):
|  | December 31, |
|  | 2023 |  |  | 2022 |
Laboratory equipment |  | $ | 49,567 |  |  | $ | 43,592 |
Computer equipment |  |  | 7,970 |  |  |  | 7,766 |
Furniture and office equipment |  |  | 3,820 |  |  |  | 5,342 |
Computer software |  |  | 1,965 |  |  |  | 1,069 |
Construction in progress |  |  | 3,405 |  |  |  | 7,625 |
Leasehold improvements |  |  | 74,734 |  |  |  | 72,403 |
Total property and equipment, at cost |  |  | 141,461 |  |  |  | 137,797 |
Less: Accumulated depreciation |  |  | (73,234 | ) |  |  | (54,350 | )
Property and equipment, net |  | $ | 68,227 |  |  | $ | 83,447 |
Depreciation expense was $20.5 million, $19.2 million and $12.3 million for the year ended December 31, 2023, 2022 and 2021, respectively. See Note 10, Leases for details regarding the impairment loss we recognized for certain leasehold improvements for the year ended December 31, 2023.

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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://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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