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Composition of Certain Balance Sheet Items
 12 Months Ended
Dec. 31, 2017
Composition of Certain Balance Sheet Items [Abstract]  
Composition of Certain Balance Sheet Items
Composition of Certain Balance Sheet Items
Property and Equipment, net
Property and equipment, net consisted of the following (in thousands):
 
December 31,
 
2017
 
2016
Machinery and equipment
$
9,078

 
$
9,629

Leasehold improvements
579

 
2,769

Purchased computer software
1,316

 
363

Build-to-suit property
51,760

 
51,359

 
62,733

 
64,120

Less: accumulated depreciation and amortization
(7,743
)
 
(7,668
)
Property and equipment, net
$
54,990

 
$
56,452


Depreciation expense was $3.1 million, $2.4 million and $0.8 million for the years ended December 31, 2017, 2016 and 2015, respectively. The depreciation expense for the year ended December 31, 2016 includes incremental depreciation of $1.2 million associated with the acceleration of the useful life of certain leasehold improvements and other assets that were at the Company's former South San Francisco facility. See Note 7, “Commitments and Contingencies.”
Other Current Liabilities
Other current liabilities consisted of the following (in thousands):
 
December 31, 2017
 
December 31, 2016
Payroll and related expenses
$
7,342

 
$
6,629

Professional services
438

 
435

Deferred rent
49

 
363

Other
1,356

 
1,128

Other current liabilities
$
9,185

 
$
8,555