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Property and Equipment | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and Equipment Property and equipment consist of the following:
|  | December 31,
(in thousands) |  | 2021 |  | 2020
Leasehold improvements |  | $ | 24,168 |  |  | $ | 24,146 |
Research equipment |  | 16,663 |  |  | 15,387 |
Construction in progress |  | 8,229 |  |  | 5,870 |
Computer equipment |  | 5,720 |  |  | 5,546 |
Land |  | 3,190 |  |  | 3,190 |
Furniture and fixtures |  | 3,163 |  |  | 2,880 |
Computer software |  | 1,174 |  |  | 1,207 |
Vehicles |  | 71 |  |  | 124 |
Gross property and equipment |  | 62,378 |  |  | 58,350 |
Less accumulated depreciation |  | (19,882) |  |  | (14,487) |
Net property and equipment |  | $ | 42,496 |  |  | $ | 43,863 |
Depreciation expense was $5.7 million and $8.4 million for the years ended December 31, 2021 and December 31, 2020, 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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