Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenue	$ 584,106us-gaap_SalesRevenueNet	$ 361,224us-gaap_SalesRevenueNet	$ 193,408us-gaap_SalesRevenueNet
Cost of revenue	192,015us-gaap_CostOfRevenue	122,686us-gaap_CostOfRevenue	61,252us-gaap_CostOfRevenue
Gross profit	392,091us-gaap_GrossProfit	238,538us-gaap_GrossProfit	132,156us-gaap_GrossProfit
Operating expenses:
Research and development	148,909us-gaap_ResearchAndDevelopmentExpense	98,587us-gaap_ResearchAndDevelopmentExpense	55,155us-gaap_ResearchAndDevelopmentExpense
Sales and marketing	85,338us-gaap_SellingAndMarketingExpense	55,115us-gaap_SellingAndMarketingExpense	28,603us-gaap_SellingAndMarketingExpense
General and administrative	32,331us-gaap_GeneralAndAdministrativeExpense	18,688us-gaap_GeneralAndAdministrativeExpense	8,501us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	266,578us-gaap_OperatingExpenses	172,390us-gaap_OperatingExpenses	92,259us-gaap_OperatingExpenses
Income from operations	125,513us-gaap_OperatingIncomeLoss	66,148us-gaap_OperatingIncomeLoss	39,897us-gaap_OperatingIncomeLoss
Other income (expense), net:
Interest expense—related party	(782)us-gaap_InterestExpenseRelatedParty	(1,739)us-gaap_InterestExpenseRelatedParty	(1,735)us-gaap_InterestExpenseRelatedParty
Interest expense	(5,498)	(5,380)	(5,322)
Other income (expense), net	2,275us-gaap_OtherNonoperatingIncomeExpense	(754)us-gaap_OtherNonoperatingIncomeExpense	135us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense), net	(4,005)us-gaap_NonoperatingIncomeExpense	(7,873)us-gaap_NonoperatingIncomeExpense	(6,922)us-gaap_NonoperatingIncomeExpense
Income before provision for income taxes	121,508	58,275	32,975
Provision for income taxes	34,658us-gaap_IncomeTaxExpenseBenefit	15,815us-gaap_IncomeTaxExpenseBenefit	11,626us-gaap_IncomeTaxExpenseBenefit
Net income	86,850us-gaap_NetIncomeLoss	42,460us-gaap_NetIncomeLoss	21,349us-gaap_NetIncomeLoss
Net income attributable to common stockholders:
Basic	68,889	20,777	9,622
Diluted	$ 70,524	$ 21,780	$ 9,662
Net income per share attributable to common stockholders:
Basic (in dollars per share)	$ 1.42us-gaap_EarningsPerShareBasic	$ 0.76us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 1.29us-gaap_EarningsPerShareDiluted	$ 0.72us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted
Weighted-average shares used in computing net income per share attributable to common stockholders:
Basic (in shares)	48,427	27,320	24,711
Diluted (in shares)	54,590	30,051	24,901

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