Balance sheet components

Inventories



	December 31,				June 30,
(in thousands)	2010		2011		2012
					(unaudited)
Raw materials	$	740	$	250	$	39
Finished goods	2,083		3,113		2,893
Total inventories	$	2,823	$	3,363	$	2,932

Property and equipment




	December 31,						June 30,
(in thousands)	2010			2011			2012
							(unaudited)

Computer equipment and software	$	2,644		$	3,712		$	4,173
Furniture fixtures and equipment	666			1,018			966
Leasehold improvements	1,070			1,493			1,680
Manufacturing tools and equipment	2,229			3,027			3,290
Construction in process	333			90			107
	6,942			9,340			10,216
Less: Accumulated depreciation	(5,635		)	(6,639		)	(7,522		)
Property and equipment, net	$	1,307		$	2,701		$	2,694

Depreciation and amortization expense during 2009, 2010 and 2011 was $0.8 million, $0.7 million and $1.0 million, respectively. Depreciation and amortization expense for the six months ended June 30, 2011 and 2012 (unaudited) was $0.3 million and $0.8 million, respectively.

Accrued payroll and other accruals



	December 31,				June 30,
(in thousands)	2010		2011		2012
					(unaudited)
Payroll and related expenses	$	3,705	$	4,424	$	4,868
Uninvoiced purchases	1,982		1,741		1,562
Preferred stock warrant liability	—		1,853		—
Deferred rent	331		500		550
Exercise of unvested stock options	5		373		299
ExperiaHealth performance awards	46		—		—
Customer prepayments	223		387		836
Sales and use tax payable	405		343		442
Other	320		522		544
Total accrued payroll and other accruals	$	7,017	$	10,143	$	9,101