Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenue	$ 71,688	$ 99,145
Cost of goods sold	53,185	68,023
Gross profit	18,503	31,122
Operating expenses:
Research and development	15,544	12,952
Sales and marketing	4,932	3,931
General and administrative	11,426	9,084
Amortization of purchased intangible assets	118	453
Acquisition and asset sale related costs	130
Restructuring charges	227
Gain on asset sale	(2,000)
Total operating expenses	30,377	26,420
Income (loss) from operations	(11,874)	4,702
Interest income	73	55
Interest expense	(137)	(102)
Other income (expense), net	249	(1,304)
Total interest and other income (expense), net	185	(1,351)
Income (loss) before income taxes	(11,689)	3,351
Income tax (provision) benefit	167	(1,041)
Net income (loss)	$ (11,522)	$ 2,310
Basic net income (loss) per share	$ (0.27)	$ 0.06
Diluted net income (loss) per share	$ (0.27)	$ 0.05
Weighted average shares used to compute basic net income (loss) per share	42,615	41,121
Weighted average shares used to compute diluted net income (loss) per share	42,615	43,648