Consolidated Statements of Comprehensive Loss (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements of Comprehensive Loss
Revenues (includes related party revenues of $0, $0, and $1,431 for the years ended December 31, 2014, 2013 and 2012, respectively.	$ 206,649us-gaap_SalesRevenueNet	$ 133,958us-gaap_SalesRevenueNet	$ 79,889us-gaap_SalesRevenueNet
Costs and operating expenses:
Cost of revenue (exclusive of depreciation and amortization presented separately below; includes related party expenses of $405, $2,738, and $2,289 for 2014, 2013 and 2012, respectively)	17,513	15,295	13,559
Sales and marketing (includes related party expenses of $19,443, $10,164, and $3,981 for the years ended December 31, 2014, 2013 and 2012, respectively)	128,569us-gaap_SellingAndMarketingExpense	75,180us-gaap_SellingAndMarketingExpense	70,327us-gaap_SellingAndMarketingExpense
Technology and development	36,563true_TechnologyAndDevelopment	23,685true_TechnologyAndDevelopment	21,960true_TechnologyAndDevelopment
General and administrative	58,296us-gaap_GeneralAndAdministrativeExpense	30,857us-gaap_GeneralAndAdministrativeExpense	34,228us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	13,213	11,569	11,768
Total costs and operating expenses	254,154us-gaap_CostsAndExpenses	156,586us-gaap_CostsAndExpenses	151,842us-gaap_CostsAndExpenses
Loss from operations	(47,505)us-gaap_OperatingIncomeLoss	(22,628)us-gaap_OperatingIncomeLoss	(71,953)us-gaap_OperatingIncomeLoss
Interest income	59us-gaap_InvestmentIncomeInterest	121us-gaap_InvestmentIncomeInterest	229us-gaap_InvestmentIncomeInterest
Interest expense	(380)us-gaap_InterestExpense	(1,988)us-gaap_InterestExpense	(3,359)us-gaap_InterestExpense
Other income (expense)	37us-gaap_OtherNonoperatingIncomeExpense	18us-gaap_OtherNonoperatingIncomeExpense	(18)us-gaap_OtherNonoperatingIncomeExpense
Loss before (provision) benefit for income taxes	(47,789)	(24,477)	(75,101)
(Provision) benefit for income taxes	(640)us-gaap_IncomeTaxExpenseBenefit	(579)us-gaap_IncomeTaxExpenseBenefit	606us-gaap_IncomeTaxExpenseBenefit
Net loss	(48,429)us-gaap_NetIncomeLoss	(25,056)us-gaap_NetIncomeLoss	(74,495)us-gaap_NetIncomeLoss
Net loss per share attributable to common stockholders:
Basic and diluted (in dollars per share)	$ (0.68)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.43)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.33)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average common shares outstanding, basic and diluted (in shares)	70,837	58,540	55,828
Other comprehensive loss:
Unrealized gain on marketable securities			35
Comprehensive loss	$ (48,429)	$ (25,056)	$ (74,460)

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