Balance Sheet Components

12 Months Ended

Dec. 31, 2016

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

5. Balance Sheet Components

Property and Equipment

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

	As of December 31,
	2016			2015
Scientific equipment	$	4,858		$	3,995
Furniture and equipment		546			301
Capitalized software		237			225
Leasehold improvements		308			303
Total		5,949			4,824
Less: Accumulated depreciation		(3,191	)		(2,080	)
Property and equipment, net	$	2,758		$	2,744

Depreciation expense was $1.1 million, $1.0 million and $0.7 million for the years ended December 31, 2016, 2015 and 2014 respectively.

Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

	As of December 31,
	2016		2015
Payroll and related	$	3,717	$	2,515
Clinical research and development		3,981		2,145
Other		992		973
Total accrued liabilities	$	8,690	$	5,633