Balance Sheet Components

3 Months Ended

Mar. 31, 2016

5. Balance Sheet Components

Property and Equipment

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

	March 31, 2016			December 31, 2015
Scientific equipment	$	4,462		$	3,995
Furniture and equipment		352			301
Capitalized software		225			225
Leasehold improvements		304			303
Total		5,343			4,824
Less: Accumulated depreciation and amortization		(2,336	)		(2,080	)
Property and equipment, net	$	3,007		$	2,744

Depreciation and amortization expense was $0.3 million and $0.3 million for the three months ended March 31, 2016 and 2015, respectively.

Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

	March 31, 2016		December 31, 2015
Payroll and related expenses	$	1,522	$	2,515
Clinical research and development		2,478		2,145
Legal and accounting fees		371		33
Other		456		940
Total accrued liabilities	$	4,827	$	5,633