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Property and Equipment | 12 Months Ended
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Dec. 29, 2017
Property, Plant and Equipment [Abstract] |
Property and Equipment | PROPERTY AND EQUIPMENT Property and equipment were as follows (in thousands):
| December 31, 2017 |  | December 31, 2016
Computer equipment and software | $ | 14,146 |  |  | $ | 13,738 |
Laboratory equipment | 5,959 |  |  | 4,310 |
Leasehold improvements | 4,715 |  |  | 6,646 |
Furniture and fixtures | 1,609 |  |  | 2,240 |
Construction in progress | 22,114 |  |  | 19 |
| 48,543 |  |  | 26,953 |
Less: accumulated depreciation and amortization | (22,800 | ) |  | (24,882 | )
Property and equipment, net | $ | 25,743 |  |  | $ | 2,071 |
Depreciation expense was $1.2 million, $1.0 million and $1.4 million during the years ended December 31, 2017, 2016 and 2015, respectively. Build-to-Suit Lease On May 2, 2017, we entered into a Lease Agreement (the “Lease”) with Ascentris 105, LLC (“Ascentris”), to lease 110,783 square feet of space in office and research facilities located at 1751, 1801, and 1851 Harbor Bay Parkway, Alameda, California (the “Premises”). On October 16, 2017, we executed an amendment to the Lease for 19,778 square feet of additional space located at the Premises with terms consistent with the original Lease. See “Note 12. Commitments” for a description of the Lease. In connection with the Lease, we received a tenant improvement allowance of $7.7 million from Ascentris, for the costs associated with the design, development and construction of tenant improvements for the Premises. We are obligated to fund all costs incurred in excess of the tenant improvement allowance and to certain indemnification obligations related to the construction activities. We evaluated our involvement during the construction period and determined the scope of the tenant improvements on portions of the Premises including the building shells did not qualify as “normal tenant improvements” under Accounting Standards Codification (“ASC”) Topic 840, Leases. Accordingly, for accounting purposes, we are the deemed owner of such portions of the Premises during the construction period. As such, we will capitalize the construction costs as a build-to-suit property within property and equipment, net, including the estimated fair value of the building shells that we are deemed to own at the lease inception date, as determined using a third-party appraisal. The capitalized construction costs will also include the estimated tenant improvements incurred by Ascentris. Accordingly, we capitalized $14.5 million of costs related to the Lease in construction in progress as of May 2, 2017, with a corresponding build-to-suit lease obligation in Other long-term liabilities. As of December 31, 2017, we have capitalized an additional $6.6 million of construction in progress for tenant improvements related to the Premises. As of December 31, 2017, we have also prepaid an additional $11.1 million for future constructions costs which is included in Other long-term assets on the accompanying Consolidated Balance Sheets. Once the construction is complete, we will consider the requirements for sale-leaseback accounting treatment, including evaluating whether all risks of ownership have been transferred back to Ascentris, as evidenced by a lack of continuing involvement in the leased property. If the arrangement does not qualify for sale-leaseback accounting treatment, the building assets will remain on the accompanying Consolidated Balance Sheets at their historical cost.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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