Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
Product	$ 244,295	$ 278,875	$ 179,246
Services	22,685	22,620	23,805
Total revenue	266,980	301,495	203,051
Cost of revenue:
Product	149,007	181,060	113,285
Services	18,375	18,729	19,602
Total cost of revenue	167,382	199,789	132,887
Gross profit	99,598	101,706	70,164
Operating expenses:
Research and development	34,402	32,586	33,533
Sales and marketing	23,839	23,325	20,713
General and administrative	24,452	25,059	23,958
Restructuring charges	282	18	2,621
Total operating expenses	82,975	80,988	80,825
Income (loss) from operations	16,623	20,718	(10,661)
Other (expense) income:
Interest income	238	64	32
Interest expense	(5,073)	(4,976)	(1,069)
Other, net	(764)	(601)	1,531
Total other (expense) income	(5,599)	(5,513)	494
Income (loss) before income taxes	11,024	15,205	(10,167)
Income tax provision	23	527	1,099
Net income (loss)	$ 11,001	$ 14,678	$ (11,266)
Net income (loss) per share:
Basic (in dollars per share)	$ 0.38	$ 0.51	$ (0.40)
Diluted (in dollars per share)	$ 0.36	$ 0.49	$ (0.40)
Shares used in computing net income (loss) per share:
Basic weighted average common shares	29,195	28,595	27,862
Diluted weighted average common shares	30,947	30,229	27,862