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Property and Equipment, Net | 9 Months Ended
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Sep. 30, 2021
Property Plant And Equipment [Abstract] |
Property and Equipment, Net | . Property and Equipment, net Property and equipment, net consisted of the following (in thousands):
|  | Useful life (in years) |  | September 30, 2021 |  |  | December 31, 2020 |
Laboratory equipment |  | 3 |  | $ | 5,502 |  |  | $ | 4,350 |
Leasehold improvements |  | Lesser of useful life or lease term |  |  | 1,614 |  |  |  | 1,427 |
Furniture and fixtures |  | 3 |  |  | 303 |  |  |  | 524 |
Construction in progress |  | — |  |  | 9,402 |  |  |  | 1,090 |
Computer equipment |  | 3 |  |  | 217 |  |  |  | 93 |
Software |  | 3 |  |  | 320 |  |  |  | 170 |
|  |  |  |  | 17,358 |  |  |  | 7,654 |
Less: Accumulated depreciation and amortization |  |  |  |  | (5,963 | ) |  |  | (4,864 | )
Property and equipment, net |  |  |  | $ | 11,395 |  |  | $ | 2,790 |
Depreciation and amortization expense was $0.4 million and $0.3 million for the three months ended September 30, 2021 and 2020, respectively. Depreciation and amortization expense was $1.2 million and $0.9 million for the nine months ended September 30, 2021 and 2020, respectively. Construction in progress has increased by $6.8 million and $9.4 million in the three and nine months ended September 30, 2021, due to building construction related to the Company's leased space in Redwood City. Construction in process will continue to increase through the first half of 2022, upon completion of the construction.

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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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