5. Balance Sheet Components

Property and Equipment

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

	September 30, 2016			December 31, 2015
Scientific equipment	$	4,597		$	3,995
Furniture and equipment		488			301
Capitalized software		231			225
Leasehold improvements		308			303
Total		5,624			4,824
Less: Accumulated depreciation and amortization		(2,895	)		(2,080	)
Property and equipment, net	$	2,729		$	2,744

Depreciation and amortization expense was $0.3 million and $0.8 million, and $0.2 million and $0.7 million, for the three and nine months ended September 30, 2016 and 2015, respectively.

Deferred Offering Costs

Deferred offering costs, consisting of legal, accounting and other fees and costs related to the Company’s follow-on public offering are capitalized and will be offset against the proceeds received by the Company in October 2016. There were $0.5 million and zero deferred offering costs capitalized as of September 30, 2016 and December 31, 2015, respectively, in other long term assets on the consolidated balance sheets.

Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

	September 30, 2016		December 31, 2015
Payroll and related expenses	$	3,257	$	2,515
Clinical research and development		2,618		2,145
Legal and accounting fees		409		33
Other		646		940
Total accrued liabilities	$	6,930	$	5,633