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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 | 5. Property and Equipment, net Property and equipment, net, consists of the following (in thousands):
|  | As of December 31, |
|  | 2021 |  |  | 2020 |
Computer equipment |  | $ | 1,757 |  |  | $ | 727 |
Furniture, fixtures, and other |  |  | 4,371 |  |  |  | 3,416 |
Laboratory equipment |  |  | 30,123 |  |  |  | 25,353 |
Leasehold improvements |  |  | 86,735 |  |  |  | 25,473 |
Construction work in process |  |  | 52,396 |  |  |  | 8,366 |
Total property and equipment, gross |  |  | 175,382 |  |  |  | 63,335 |
Accumulated Depreciation |  |  | (37,807 | ) |  |  | (21,175 | )
Total property and equipment, net |  | $ | 137,575 |  |  | $ | 42,160 |
Depreciation expense for the year ended December 31, 2021, 2020 and 2019 was $17.9 million, $9.1 million, and $4.7 million, 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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