Balance Sheets Details (Tables)

3 Months Ended

Mar. 31, 2018

Inventories consisted of the following (in thousands):



	March 31, 2018		December 31, 2017
Raw materials	$	158	$	158
Work-in-process	123		53
Finished goods	931		825
Inventories	$	1,212	$	1,036

Schedule of property and equipment, net

Property and equipment, net consisted of the following (in thousands):



	March 31, 2018			December 31, 2017
Laboratory equipment ⁽¹⁾	$	19,769		$	19,777
Leasehold improvements	10,327			10,327
Computer equipment and software	3,723			3,695
Office equipment and furniture	1,185			1,185
Construction in progress ⁽²⁾	90			85
Property and equipment	35,094			35,069
Less: accumulated depreciation and amortization	(32,474		)	(32,254		)
Property and equipment, net	$	2,620		$	2,815

⁽¹⁾ Fully depreciated laboratory equipment with a cost of $19 thousand and $0.2 million was retired during three months ended March 31, 2018 and full year in 2017.

⁽²⁾ Construction in progress includes equipment received but not yet placed into service pending installation.

Schedule of accrued liabilities

Other accrued liabilities consisted of the following (in thousands):



	March 31, 2018		December 31, 2017
Accrued purchases ⁽¹⁾	$	1,084	$	941
Accrued professional and outside service fees	1,728		2,393
Accrued expenses - cost of sales	1,318		—
Deferred rent	278		258
Lease incentive obligation	425		425
Other	471		345
Total	$	5,304	$	4,362

(1) Amount represents products and services received but not billed as of March 31, 2018 and December 31, 2017.