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Fixed Assets, Net | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment [Abstract] |
Fixed Assets, Net | 7. Fixed Assets, Net Fixed assets are stated at cost and depreciated using the straight-line method, based on useful lives as follows (in thousands):
|  | Estimated Useful Life (years) |  | As of December 31,
Asset Description |  |  | 2023 |  | 2022
Lab equipment |  | 7 |  | $ | 22,660 |  |  | $ | 16,403 |
Furniture and fixtures |  | 7 |  | 6,428 |  |  | 6,428 |
Computer hardware and software |  | 3 - 5 |  | 6,001 |  |  | 5,227 |
Office equipment |  | 7 |  | 89 |  |  | 89 |
Manufacturing equipment |  | 7 |  | 1,336 |  |  | 1,203 |
Leasehold improvements |  | 2 - 10 |  | 38,049 |  |  | 37,057 |
Construction in progress |  | — |  | 35,449 |  |  | 29,529 |
|  |  |  | 110,012 |  |  | 95,936 |
Less accumulated depreciation |  |  |  | (44,628) |  |  | (39,445) |
|  |  |  | $ | 65,384 |  |  | $ | 56,491 |
Depreciation expense wa s $5.5 million, $5.3 million and $9.1 million for the years ended December 31, 2023, 2022 and 2021, respectivel y.

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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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