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Property and Equipment | 3 Months Ended
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Mar. 30, 2018
Property, Plant and Equipment [Abstract] |
PROPERTY AND EQUIPMENT | PROPERTY AND EQUIPMENT Property and equipment consisted of the following (in thousands):
| March 31, 2018 |  | December 31, 2017
Computer equipment and software | $ | 14,772 |  |  | $ | 14,146 |
Laboratory equipment | 5,959 |  |  | 5,959 |
Leasehold improvements | 4,715 |  |  | 4,715 |
Furniture and fixtures | 1,609 |  |  | 1,609 |
Construction in progress | 41,528 |  |  | 22,114 |
| 68,583 |  |  | 48,543 |
Less: accumulated depreciation and amortization | (23,171 | ) |  | (22,800 | )
Property and equipment, net | $ | 45,412 |  |  | $ | 25,743 |
Depreciation expense was $0.4 million and $0.3 million for the three months ended March 31, 2018 and 2017, 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 1851, 1801, and 1751 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. For a description of the Lease, see “Note 12. Commitments” to our Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2017 filed with the SEC on February 26, 2018. 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 Topic 840, Leases. Accordingly, for accounting purposes, we are the deemed to be the 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 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 March 31, 2018, we have capitalized an additional $26.8 million of construction in progress for tenant improvements related to the Premises. As of March 31, 2018 and December 31, 2017, we had also prepaid an additional $0.6 million and $11.1 million, respectively, for future constructions costs which is included in Other long-term assets on the accompanying Condensed Consolidated Balance Sheets.

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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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