Consolidated Statements of Comprehensive Loss (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Consolidated Statements of Comprehensive Loss
Revenues	$ 58,554us-gaap_SalesRevenueNet	$ 43,930us-gaap_SalesRevenueNet
Costs and operating expenses:
Cost of revenue (exclusive of depreciation and amortization presented separately below; includes related party expenses of $0 and $405 for three months ended March 31, 2015 and 2014, respectively)	5,791	3,720
Sales and marketing (includes related party expenses of $3,918 and $3,336 for the three months ended March 31, 2015 and 2014, respectively)	31,709us-gaap_SellingAndMarketingExpense	27,767us-gaap_SellingAndMarketingExpense
Technology and development	9,760true_TechnologyAndDevelopment	7,330true_TechnologyAndDevelopment
General and administrative	18,769us-gaap_GeneralAndAdministrativeExpense	11,517us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	3,925	3,114
Total costs and operating expenses	69,954us-gaap_CostsAndExpenses	53,448us-gaap_CostsAndExpenses
Loss from operations	(11,400)us-gaap_OperatingIncomeLoss	(9,518)us-gaap_OperatingIncomeLoss
Interest income	20us-gaap_InvestmentIncomeInterest	17us-gaap_InvestmentIncomeInterest
Interest expense	(45)us-gaap_InterestExpense	(170)us-gaap_InterestExpense
Other income	11us-gaap_OtherNonoperatingIncomeExpense
Loss before provision for income taxes	(11,414)	(9,671)
Provision for income taxes	(209)us-gaap_IncomeTaxExpenseBenefit	(250)us-gaap_IncomeTaxExpenseBenefit
Net loss	(11,623)us-gaap_NetIncomeLoss	(9,921)us-gaap_NetIncomeLoss
Net loss per share attributable to common stockholders:
Basic and diluted (in dollars per share)	$ (0.14)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.17)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average common shares outstanding, basic and diluted (in shares)	80,461	60,102
Other comprehensive loss:
Comprehensive loss	$ (11,623)	$ (9,921)

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