Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue:
Product	$ 303,446us-gaap_SalesRevenueGoodsNet	$ 245,935us-gaap_SalesRevenueGoodsNet	$ 201,913us-gaap_SalesRevenueGoodsNet
Service	23,473us-gaap_SalesRevenueServicesNet	17,132us-gaap_SalesRevenueServicesNet	12,740us-gaap_SalesRevenueServicesNet
Total revenue	326,919us-gaap_SalesRevenueNet	263,067us-gaap_SalesRevenueNet	214,653us-gaap_SalesRevenueNet
Cost of revenue:
Product	90,651us-gaap_CostOfGoodsSold	78,344us-gaap_CostOfGoodsSold	70,478us-gaap_CostOfGoodsSold
Service	12,454us-gaap_CostOfServices	9,844us-gaap_CostOfServices	5,306us-gaap_CostOfServices
Total cost of revenue	103,105us-gaap_CostOfGoodsAndServicesSold	88,188us-gaap_CostOfGoodsAndServicesSold	75,784us-gaap_CostOfGoodsAndServicesSold
Gross profit	223,814us-gaap_GrossProfit	174,879us-gaap_GrossProfit	138,869us-gaap_GrossProfit
Operating expenses:
Research and development	77,164us-gaap_ResearchAndDevelopmentExpense	61,783us-gaap_ResearchAndDevelopmentExpense	43,821us-gaap_ResearchAndDevelopmentExpense
Sales and marketing	98,634us-gaap_SellingAndMarketingExpense	79,185us-gaap_SellingAndMarketingExpense	56,209us-gaap_SellingAndMarketingExpense
General and administrative	33,622us-gaap_GeneralAndAdministrativeExpense	33,752us-gaap_GeneralAndAdministrativeExpense	20,237us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	209,420us-gaap_OperatingExpenses	174,720us-gaap_OperatingExpenses	120,267us-gaap_OperatingExpenses
Operating income (loss)	14,394us-gaap_OperatingIncomeLoss	159us-gaap_OperatingIncomeLoss	18,602us-gaap_OperatingIncomeLoss
Interest income (expense)	199us-gaap_InterestIncomeExpenseNet	187us-gaap_InterestIncomeExpenseNet	(472)us-gaap_InterestIncomeExpenseNet
Other expense, net	(463)us-gaap_OtherCostAndExpenseOperating	(456)us-gaap_OtherCostAndExpenseOperating	(3,664)us-gaap_OtherCostAndExpenseOperating
Income (loss) before income taxes	14,130	(110)	14,466
Income tax expense (benefit)	5,940us-gaap_IncomeTaxExpenseBenefit	(1,899)us-gaap_IncomeTaxExpenseBenefit	(17,238)us-gaap_IncomeTaxExpenseBenefit
Net income	8,190us-gaap_NetIncomeLoss	1,789us-gaap_NetIncomeLoss	31,704us-gaap_NetIncomeLoss
Net Income (Loss) Available to Common Stockholders, Basic and Diluted	$ 8,190	$ 1,789	$ 9,036
Net income per share attributable to common stockholders:
Basic (USD per share)	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic
Diluted (USD per share)	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted
Weighted average number of shares outstanding, basic (in shares)	82,908	76,744	24,847
Weighted average number of shares outstanding, diluted (in shares)	93,668	93,361	37,775

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