Property and Equipment

9 Months Ended

Sep. 28, 2018

Property, Plant and Equipment [Abstract]

Property and equipment consisted of the following (in thousands):



	September 30, 2018			December 31, 2017
Leasehold improvements	$	42,581		$	4,715
Computer equipment and software	15,533			14,146
Furniture and fixtures	3,780			1,609
Laboratory equipment	2,936			5,959
Construction in progress	2,071			22,114
	66,901			48,543
Less: accumulated depreciation and amortization	(15,855		)	(22,800		)
Property and equipment, net	$	51,046		$	25,743

Depreciation expense was $1.7 million and $2.9 million for the three and nine months ended September 30, 2018, respectively, as compared to $0.3 million and $0.8 million for the comparable periods in 2017.

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. Leases.” 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. We are continuing to review the allocation of these additions between Leasehold improvements and Furniture and fixtures.