Condensed Consolidated Statements of Operations (Unaudited) - 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	$ 47,685	$ 157,692	$ 188,024	$ 368,370
Service	29,766	33,721	95,211	88,848
Total revenue	77,451	191,413	283,235	457,218
Cost of revenue:
Cost of product revenue	33,552	105,242	125,189	266,787
Cost of service revenue	20,298	20,289	58,322	50,928
Total cost of revenue	53,850	125,531	183,511	317,715
Gross profit	23,601	65,882	99,724	139,503
Operating expenses:
Research and development, net	29,084	24,989	82,323	67,282
Sales and marketing	15,010	16,132	46,391	42,096
General and administrative	7,968	6,729	24,325	19,304
Total operating expenses	52,062	47,850	153,039	128,682
Income (loss) from operations	(28,461)	18,032	(53,315)	10,821
Other income (expense), net	(312)	(152)	(1,169)	334
Interest income, net	544	337	1,654	1,114
Income (loss) before income taxes	(28,229)	18,217	(52,830)	12,269
Income tax benefit (expense)	5,208	(7,362)	11,670	(5,027)
Net income (loss)	$ (23,021)	$ 10,855	$ (41,160)	$ 7,242
Basic net income (loss) per common share (in dollars per share)	$ (0.58)	$ 0.28	$ (1.03)	$ 0.18
Diluted net income (loss) per common share (in dollars per share)	$ (0.58)	$ 0.27	$ (1.03)	$ 0.18
Basic weighted average shares outstanding (in shares)	39,936	39,382	39,786	39,164
Diluted weighted average shares outstanding (in shares)	39,936	40,322	39,786	40,589