5. BALANCE SHEET COMPONENTS

Inventory

Inventory consisted of the following (in thousands):


	December 31,
	2014		2013
Finished Goods	$	277	$	230
Raw Materials		409		288

Total Inventory	$	686	$	518

Property and Equipment, Net

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


	December 31,
	2014			2013
Laboratory equipment	$	4,392		$	3,798
Leasehold improvements		4,040			4,336
Furniture and fixtures		825			838
Computer equipment and office equipment		3,775			3,444
Construction-in-process		28			39

		13,060			12,455
Less: Accumulated depreciation and amortization		(11,092	)		(10,902	)

Property and equipment, net	$	1,968		$	1,553

Depreciation and amortization expense was $512,000, $663,000 and $1,072,000 for the years ended December 31, 2014, 2013 and 2012, respectively.

Assets purchased under capital leases, included above in laboratory equipment and computer and office equipment, were $1,631,000 and $1,439,000 at December 31, 2014 and 2013, respectively. Accumulated amortization was $1,473,000 and $1,414,000 at December 31, 2014 and 2013, respectively. Related amortization expense, included in depreciation and amortization expense, was $59,000, $26,000 and $70,000 for the years ended December 31, 2014, 2013 and 2012, respectively.

Accrued and Other Liabilities

Accrued and other liabilities consisted of the following (in thousands):


	December 31,
	2014		2013
Professional fees	$	273	$	175
Test sample processing fees		318		195
Accrued overpayments and refunds		146		215
Clinical Studies		144		84
Deferred rent – current portion		202		145
Capital leases – current portion		70		43
Other accrued expenses		463		191

Total accrued and other liabilities	$	1,616	$	1,048