Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 71,121	$ 103,312	$ 216,023	$ 301,586
Cost of goods sold	60,608	75,863	170,230	215,486
Gross profit	10,513	27,449	45,793	86,100
Operating expenses:
Research and development	14,662	17,474	44,412	42,206
Sales and marketing	4,071	5,936	12,913	13,674
General and administrative	7,637	9,822	26,792	26,747
Amortization of purchased intangible assets	119	462	355	1,375
Acquisition and asset sale related costs	78	148	229	923
Restructuring charges	2,829	0	3,550	0
Gain on asset sale	0	0	(2,000)	0
Total operating expenses	29,396	33,842	86,251	84,925
Income (loss) from operations	(18,883)	(6,393)	(40,458)	1,175
Interest income	37	95	141	227
Interest expense	(495)	(103)	(743)	(304)
Other income (expense), net	(41)	18	197	(828)
Total interest and other income (expense), net	(499)	10	(405)	(905)
Income (loss) before income taxes	(19,382)	(6,383)	(40,863)	270
Income tax (provision) benefit	1,195	(804)	1,813	(2,471)
Net loss	$ (18,187)	$ (7,187)	$ (39,050)	$ (2,201)
Basic net loss per share (USD per share)	$ (0.42)	$ (0.17)	$ (0.90)	$ (0.05)
Diluted net loss per share (USD per share)	$ (0.42)	$ (0.17)	$ (0.90)	$ (0.05)
Weighted average shares used to compute basic net loss per share (in shares)	43,790	42,038	43,212	41,589
Weighted average shares used to compute diluted net loss per share (in shares)	43,790	42,038	43,212	41,589