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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Revenue $ 363,109us-gaap_Revenues $ 235,716us-gaap_Revenues
Cost of revenue 199,376us-gaap_CostOfRevenue 139,202us-gaap_CostOfRevenue
Gross profit 163,733us-gaap_GrossProfit 96,514us-gaap_GrossProfit
Operating expenses:    
Research and development 49,437us-gaap_ResearchAndDevelopmentExpense 28,739us-gaap_ResearchAndDevelopmentExpense
Sales and marketing 56,369us-gaap_SellingAndMarketingExpense 41,341us-gaap_SellingAndMarketingExpense
General and administrative 35,659us-gaap_GeneralAndAdministrativeExpense 9,878us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 141,465us-gaap_OperatingExpenses 79,958us-gaap_OperatingExpenses
Operating income 22,268us-gaap_OperatingIncomeLoss 16,556us-gaap_OperatingIncomeLoss
Other expense, net (2,244)us-gaap_OtherNonoperatingIncomeExpense (1,625)us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes 20,024us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 14,931us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense 3,272us-gaap_IncomeTaxExpenseBenefit 3,882us-gaap_IncomeTaxExpenseBenefit
Net income 16,752us-gaap_NetIncomeLoss 11,049us-gaap_NetIncomeLoss
Less: net income allocable to participating securities 0us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic 3,040us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Net income attributable to common stockholders—basic 16,752us-gaap_UndistributedEarnings 8,009us-gaap_UndistributedEarnings
Add: net income allocable to dilutive participating securities 0us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted 443us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted
Net income attributable to common stockholders—diluted $ 16,752us-gaap_UndistributedEarningsDiluted $ 8,452us-gaap_UndistributedEarningsDiluted
Net income per share attributable to common stockholders - Basic (in dollars per share) $ 0.13us-gaap_EarningsPerShareBasic $ 0.10us-gaap_EarningsPerShareBasic
Net income per share attributable to common stockholders - Diluted (in dollars per share) $ 0.11us-gaap_EarningsPerShareDiluted $ 0.08us-gaap_EarningsPerShareDiluted
Weighted-average shares used to compute net income per share attributable to common stockholders - Basic (in shares) 132,278us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 81,582us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted-average shares used to compute net income per share attributable to common stockholders - Diluted (in shares) 148,573us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 100,783us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding