Balance Sheet Components

6 Months Ended

Jun. 30, 2019

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

6. Balance Sheet Components

Property and Equipment

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

	June 30, 2019			December 31, 2018
Scientific equipment	$	9,944		$	9,126
Furniture and equipment		1,471			1,248
Capitalized software		389			302
Leasehold improvements		564			451
Total		12,368			11,127
Less: Accumulated depreciation		(6,933	)		(5,989	)
Property and equipment, net	$	5,435		$	5,138

Depreciation expense was $0.4 million and $0.4 million for the three months ended June 30, 2019 and 2018, respectively, and $0.9 million and $0.7 million for the six months ended June 30, 2019 and 2018, respectively.

Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

	June 30, 2019		December 31, 2018
Clinical research and development	$	16,568	$	10,903
Payroll-related liabilities		6,919		8,151
Other		1,257		1,704
Total accrued liabilities	$	24,744	$	20,758