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Property and Equipment | 12 Months Ended
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Dec. 28, 2018
Property, Plant and Equipment [Abstract] |
Property and Equipment | PROPERTY AND EQUIPMENT Property and equipment were as follows (in thousands):
| December 31, 2018 |  | December 31, 2017
Leasehold improvements | $ | 33,941 |  |  | $ | 4,715 |
Computer equipment and software | 15,022 |  |  | 14,146 |
Furniture and fixtures | 12,709 |  |  | 1,609 |
Laboratory equipment | 5,668 |  |  | 5,959 |
Construction in progress | 866 |  |  | 22,114 |
| 68,206 |  |  | 48,543 |
Less: accumulated depreciation and amortization | (17,309 | ) |  | (22,800 | )
Property and equipment, net | $ | 50,897 |  |  | $ | 25,743 |
Depreciation expense was $4.9 million, $1.2 million and $1.0 million during the years ended December 31, 2018, 2017 and 2016, respectively. In May 2017, we entered into the Lease for office and research facilities located at 1851, 1801, and 1751 Harbor Bay Parkway, Alameda, California (the Premises). The Lease was amended in October 2017 and June 2018 to increase the space leased to an aggregate of 134,765 square feet. For a description of the Lease, see “Note 11. Commitments.” In June 2018, we relocated our offices and research facilities to the Premises. Accordingly, we placed into service $46.3 million in related Leasehold improvements, Furniture and fixtures and Computer equipment and software, portions of which were included in Construction in progress at prior period ends.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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