Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenue	$ 99,145	$ 81,384
Cost of goods sold	68,023	57,331
Gross profit	31,122	24,053
Operating expenses:
Research and development	12,952	10,482
Sales and marketing	3,931	3,744
General and administrative	9,084	8,196
Amortization of purchased intangible assets	453	449
Acquisition-related costs		140
Restructuring charges		6
Total operating expenses	26,420	23,017
Income from operations	4,702	1,036
Interest income	55	30
Interest expense	(102)	(506)
Other expense, net	(1,304)	(46)
Total interest and other expense, net	(1,351)	(522)
Income before income taxes	3,351	514
Provision for income taxes	(1,041)	(414)
Net income	$ 2,310	$ 100
Basic net income per share	$ 0.06	$ 0.00
Diluted net income per share	$ 0.05	$ 0.00
Weighted average shares used to compute basic net income (loss) per share	41,121	32,780
Weighted average shares used to compute diluted net income (loss) per share	43,648	33,031