Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue	$ 77,451	$ 74,990	$ 145,619	$ 131,053
Cost of goods sold	62,883	59,389	117,251	103,695
Gross profit	14,568	15,601	28,368	27,358
Operating expenses:
Research and development	12,085	11,087	24,141	20,794
Sales and marketing	3,571	3,349	6,982	6,935
General and administrative	8,193	7,889	17,180	13,273
Amortization of purchased intangible assets	379	426	758	747
Escrow settlement gain	(3,886)		(3,886)
Acquisition-related transaction costs		681		5,191
Total operating expenses	20,342	23,432	45,175	46,940
Loss from operations	(5,774)	(7,831)	(16,807)	(19,582)
Interest income	38	72	103	203
Interest expense	(311)	(342)	(562)	(505)
Other expense, net	(635)	(273)	(1,242)	(547)
Total interest and other expense, net	(908)	(543)	(1,701)	(849)
Loss before income taxes	(6,682)	(8,374)	(18,508)	(20,431)
(Provision for) benefit from income taxes	(97)	90	(859)	(93)
Net loss	$ (6,779)	$ (8,284)	$ (19,367)	$ (20,524)
Basic and diluted net loss per share	$ (0.21)	$ (0.27)	$ (0.61)	$ (0.67)
Basic and diluted weighted average shares used to compute net loss per share	31,790	30,780	31,701	30,677