Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue:
Product	$ 58,859	$ 72,748	$ 121,034	$ 140,278
Services	5,592	5,689	10,938	11,442
Total revenue	64,451	78,437	131,972	151,720
Cost of revenue:
Product	34,638	46,560	74,902	91,745
Services	4,682	4,703	8,523	9,421
Total cost of revenue	39,320	51,263	83,425	101,166
Gross profit	25,131	27,174	48,547	50,554
Operating expenses:
Research and development	8,478	7,899	17,114	16,098
Sales and marketing	5,790	5,858	11,750	11,486
General and administrative	6,232	6,231	12,274	12,332
Restructuring charges		8	282	18
Total operating expenses	20,500	19,996	41,420	39,934
Income from operations	4,631	7,178	7,127	10,620
Other (expense) income:
Interest income	54	6	108	9
Interest expense	(1,338)	(1,310)	(2,385)	(2,353)
Other, net	(238)	49	(297)	(384)
Total other (expense) income	(1,522)	(1,255)	(2,574)	(2,728)
Income before income taxes	3,109	5,923	4,553	7,892
Income tax provision (benefit)	172	40	(332)	141
Net income	$ 2,937	$ 5,883	$ 4,885	$ 7,751
Net income per share
Basic (in dollars per share)	$ 0.10	$ 0.21	$ 0.17	$ 0.27
Diluted (in dollars per share)	$ 0.10	$ 0.20	$ 0.16	$ 0.26
Shares used in computing net income per share:
Basic weighted average common shares	29,097	28,446	29,066	28,367
Diluted weighted average common shares	30,701	30,153	30,607	29,975