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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 | 5. Property and Equipment, net Property and equipment, net consisted of the following (in thousands):
|  | Useful life (in years) |  | December 31, 2023 |  |  | December 31, 2022 |
Leasehold improvements |  | Lesser of useful life or lease term |  | $ | 26,643 |  |  | $ | 19,959 |
Laboratory equipment |  | 3 |  |  | 13,165 |  |  |  | 7,503 |
Furniture and fixtures |  | 3 |  |  | 951 |  |  |  | 184 |
Software |  | 3 |  |  | 411 |  |  |  | 353 |
Construction in progress |  | — |  |  | 265 |  |  |  | 9,292 |
Computer equipment |  | 3 |  |  | 189 |  |  |  | 172 |
Property and equipment, gross |  |  |  |  | 41,624 |  |  |  | 37,463 |
Less: Accumulated depreciation and amortization |  |  |  |  | (14,847 | ) |  |  | (8,753 | )
Property and equipment, net |  |  |  | $ | 26,777 |  |  | $ | 28,710 |
All of the Company’s property and equipment as of December 31, 2023 and 2022 is located in the U.S. Depreciation and amortization expense for the years ended December 31, 2023 and 2022 was $6.1 million and $2.6 million, respectively. The increase in expense is primarily due to the completion and subsequent depreciation of the Company's good manufacturing practice (GMP) cell processing and vector manufacturing suite at the Company's office in Redwood City, California (1000 Bridge Parkway) which was completed in February 2023. Construction in progress has decreased by $9.0 million during the year ended December 31, 2023, compared to the balance at December 31, 2022, due to the Company's completion of the Company's GMP cell processing and vector manufacturing suite in February 2023. The remaining $0.3 million in construction in progress as of December 31, 2023 is primarily related to lab and computer equipment not yet placed into service.

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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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