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Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Schedule of Estimated Ranges of Useful Lives of Property and Equipment | Property, equipment and leasehold improvements are stated at cost less accumulated depreciation and amortization calculated using the straight-line method over their estimated useful lives as follows:
| Asset classification | Estimated useful life |
| Laboratory equipment | 5 years |
| Computer equipment and software | 3 years |
| Office equipment and furniture | 5 years |
| Leasehold improvements | Lesser of useful life or lease term |
Property and equipment, net consisted of the following (in thousands):
| December 31,
| 2023 |  | 2022
Laboratory equipment(1) | $ | 37,216 |  |  | $ | 39,679 |
Leasehold improvements | 11,912 |  |  | 16,633 |
Computer equipment and software | 2,565 |  |  | 3,039 |
Office equipment and furniture | 1,469 |  |  | 1,345 |
Construction in progress(2) | 1,636 |  |  | 1,739 |
Property and equipment | 54,798 |  |  | 62,435 |
Less: accumulated depreciation and amortization | (39,311) |  |  | (39,821) |
Property and equipment, net | $ | 15,487 |  |  | $ | 22,614 |
(1) Fully depreciated property and equipment with a cost of $3.0 million and $1.5 million were retired during the years ended December 31, 2023 and 2022, respectively. (2) Construction in progress includes equipment received but not yet placed into service pending installation. Depreciation expense included in both research and development expenses and selling, general and administrative expenses in the consolidated statements of operations was as follows (in thousands):
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Depreciation expense | $ | 5,518 |  |  | $ | 5,402 |  |  | $ | 3,113 |

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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