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PROPERTY AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2020
Property Plant And Equipment [Abstract] |
PROPERTY AND EQUIPMENT |
6. | PROPERTY AND EQUIPMENT:
Property and equipment consist of the following (in thousands):
|  | December 31, |
|  | 2020 |  |  | 2019 |
Land |  | $ | 2,642 |  |  | $ | 2,642 |
Building and improvements |  |  | 53,568 |  |  |  | 47,994 |
Office and lab equipment |  |  | 85,881 |  |  |  | 74,726 |
Furniture, fixtures and computer related assets |  |  | 8,921 |  |  |  | 7,592 |
Construction-in-progress |  |  | 23,594 |  |  |  | 12,194 |
|  |  | 174,606 |  |  |  | 145,148 |
Less: Accumulated depreciation |  |  | (72,493 | ) |  |  | (57,276 | )
Property and equipment, net |  | $ | 102,113 |  |  | $ | 87,872 |
Depreciation expense was $15.2 million, $12.5 million and $8.6 million for the years ended December 31, 2020, 2019 and 2018, 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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