Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 73,214	$ 99,129	$ 144,902	$ 198,274
Cost of goods sold	56,437	71,600	109,622	139,623
Gross profit	16,777	27,529	35,280	58,651
Operating expenses:
Research and development	14,206	11,780	29,750	24,732
Sales and marketing	3,910	3,807	8,842	7,738
General and administrative	7,729	7,841	19,155	16,925
Amortization of purchased intangible assets	118	460	236	913
Acquisition and asset sale related costs	21	775	151	775
Restructuring charges	494		721
Gain on asset sale			(2,000)
Total operating expenses	26,478	24,663	56,855	51,083
Income (loss) from operations	(9,701)	2,866	(21,575)	7,568
Interest income	31	77	104	132
Interest expense	(111)	(99)	(248)	(201)
Other income (expense), net	(11)	458	238	(846)
Total interest and other income (expense), net	(91)	436	94	(915)
Income (loss) before income taxes	(9,792)	3,302	(21,481)	6,653
Income tax (provision) benefit	451	(626)	618	(1,667)
Net income (loss)	$ (9,341)	$ 2,676	$ (20,863)	$ 4,986
Basic net income (loss) per share	$ (0.22)	$ 0.06	$ (0.49)	$ 0.12
Diluted net income (loss) per share	$ (0.22)	$ 0.06	$ (0.49)	$ 0.11
Weighted average shares used to compute basic net income (loss) per share	43,219	41,603	42,919	41,362
Weighted average shares used to compute diluted net income (loss) per share	43,219	44,320	42,919	44,042