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Consolidated Statement of Operations (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 $ 125,295us-gaap_Revenues $ 83,830us-gaap_Revenues $ 57,072us-gaap_Revenues
Expenses:      
Cost of revenue 20,754us-gaap_CostOfRevenue 15,358us-gaap_CostOfRevenue 12,367us-gaap_CostOfRevenue
Sales and marketing 43,203us-gaap_SellingAndMarketingExpense 25,811us-gaap_SellingAndMarketingExpense 20,458us-gaap_SellingAndMarketingExpense
Technology and development 22,718us-gaap_ResearchAndDevelopmentExpense 18,615us-gaap_ResearchAndDevelopmentExpense 13,115us-gaap_ResearchAndDevelopmentExpense
General and administrative 57,398us-gaap_GeneralAndAdministrativeExpense 27,926us-gaap_GeneralAndAdministrativeExpense 12,331us-gaap_GeneralAndAdministrativeExpense
Total expenses 144,073us-gaap_CostsAndExpenses 87,710us-gaap_CostsAndExpenses 58,271us-gaap_CostsAndExpenses
Loss from operations (18,778)us-gaap_OperatingIncomeLoss (3,880)us-gaap_OperatingIncomeLoss (1,199)us-gaap_OperatingIncomeLoss
Other (income) expense:      
Interest expense, net 110us-gaap_InterestIncomeExpenseNet 273us-gaap_InterestIncomeExpenseNet 343us-gaap_InterestIncomeExpenseNet
Change in fair value of preferred stock warrant liabilities 732us-gaap_FairValueAdjustmentOfWarrants 4,121us-gaap_FairValueAdjustmentOfWarrants 515us-gaap_FairValueAdjustmentOfWarrants
Foreign exchange (gain) loss, net (1,119)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 728us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 171us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Total other (income) expense, net (277)us-gaap_NonoperatingIncomeExpense 5,122us-gaap_NonoperatingIncomeExpense 1,029us-gaap_NonoperatingIncomeExpense
Loss before income taxes (18,501)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (9,002)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (2,228)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes 172us-gaap_IncomeTaxExpenseBenefit 247us-gaap_IncomeTaxExpenseBenefit 134us-gaap_IncomeTaxExpenseBenefit
Net loss (18,673)us-gaap_NetIncomeLoss (9,249)us-gaap_NetIncomeLoss (2,362)us-gaap_NetIncomeLoss
Cumulative preferred stock dividends (1,116)us-gaap_PreferredStockDividendsIncomeStatementImpact (4,244)us-gaap_PreferredStockDividendsIncomeStatementImpact (4,255)us-gaap_PreferredStockDividendsIncomeStatementImpact
Net loss attributable to common stockholders $ (19,789)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (13,493)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (6,617)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic and diluted net loss per share attributable to common stockholders (in dollars per share) $ (0.70)us-gaap_EarningsPerShareBasicAndDiluted $ (1.17)us-gaap_EarningsPerShareBasicAndDiluted $ (0.60)us-gaap_EarningsPerShareBasicAndDiluted
Basic and diluted weighted-average shares used to compute net loss per share attributable to common stockholders (in shares) 28,217us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 11,488us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 11,096us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted