Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue:
Product	$ 59,302	$ 73,795	$ 180,336	$ 214,073
Services	6,348	5,522	17,286	16,964
Total revenue	65,650	79,317	197,622	231,037
Cost of revenue:
Product	36,360	45,698	111,262	137,443
Services	5,186	4,440	13,709	13,861
Total cost of revenue	41,546	50,138	124,971	151,304
Gross profit	24,104	29,179	72,651	79,733
Operating expenses:
Research and development	8,493	8,581	25,607	24,679
Sales and marketing	5,992	6,322	17,742	17,808
General and administrative	5,988	6,584	18,262	18,916
Restructuring charges			282	18
Total operating expenses	20,473	21,487	61,893	61,421
Income from operations	3,631	7,692	10,758	18,312
Other (expense) income:
Interest income	53	7	161	16
Interest expense	(1,342)	(1,274)	(3,727)	(3,627)
Other, net	(55)	(167)	(352)	(551)
Total other (expense) income	(1,344)	(1,434)	(3,918)	(4,162)
Income before income taxes	2,287	6,258	6,840	14,150
Income tax provision (benefit)	136	157	(196)	298
Net income	$ 2,151	$ 6,101	$ 7,036	$ 13,852
Net income per share
Basic (in dollars per share)	$ 0.07	$ 0.21	$ 0.24	$ 0.49
Diluted (in dollars per share)	$ 0.07	$ 0.20	$ 0.23	$ 0.46
Shares used in computing net income per share:
Basic weighted average common shares	29,221	28,700	29,118	28,480
Diluted weighted average common shares	31,037	30,466	30,760	30,155