Trulia (TRLA) Inactive 10-K2 Mar 152014 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
Document and Entity Information (USD $)	Dec. 31, 2014	Feb. 13, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	TRLA
Entity Registrant Name	TRULIA, INC.
Entity Central Index Key	1349454
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		38,519,391
Entity Public Float			$727,949,559

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$198,781	$225,597
Accounts receivable, net of allowance for doubtful accounts of $86 and $411 as of December 31, 2014 and 2013, respectively	12,630	11,697
Prepaid expenses and other current assets	6,950	12,272
Total current assets	218,361	249,566
Restricted cash	6,717	1,589
Property and equipment, net	49,755	22,289
Intangible assets, net	102,567	117,888
Goodwill	255,904	255,904
Other assets	7,210	8,173
TOTAL ASSETS	640,514	655,409
CURRENT LIABILITIES:
Accounts payable	1,974	3,018
Accrued liabilities and restructuring costs	13,883	11,261
Accrued compensation and benefits	10,587	10,863
Deferred revenue	9,320	10,002
Deferred rent, current portion	1,009	1,035
Capital lease liability, current portion	24	51
Total current liabilities	36,797	36,230
Deferred rent, net of current portion	12,085	4,751
Capital lease liability, net of current portion	70	84
Long-term debt	230,000	230,000
Other long-term liabilities	1,315	3,268
Total liabilities	280,267	274,333
Commitments and contingencies (NOTE 8)
STOCKHOLDERS' EQUITY:
Preferred stock, par value of $0.00001, 20,000,000 shares authorized as of December 31, 2014 and 2013; no shares issued or outstanding as of December 31, 2014 and 2013
Common stock, par value of $0.00001, 1,000,000,000 shares authorized as of December 31, 2014 and 2013; 39,318,329 and 37,668,476 shares issued as of December 31, 2014 and 2013, respectively; 38,232,425 and 36,582,572 shares outstanding as of December 31, 2014 and 2013, respectively	0	0
Treasury stock at $27.65, 1,085,904 as of December 31, 2014 and 2013	0	0
Additional paid-in capital	500,894	445,960
Accumulated deficit	-140,647	-64,884
Total stockholders' equity	360,247	381,076
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$640,514	$655,409

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$86	$411
Preferred stock, par value	$0.00	$0.00
Preferred stock, authorized	20,000,000	20,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	39,318,329	37,668,476
Common stock, shares outstanding	38,232,425	36,582,572
Treasury stock, per share	$27.65	$27.65
Treasury stock, shares	1,085,904	1,085,904

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenue	$251,937	$143,728	$68,085
Cost and operating expenses:
Cost of revenue (exclusive of amortization of product development cost)	44,538	23,122	9,999
Technology and development	57,643	34,612	20,199
Sales and marketing	144,180	71,370	33,747
General and administrative	49,964	32,702	13,659
Acquisition costs	18,144	6,065
Restructuring costs	4,987
Total cost and operating expenses	319,456	167,871	77,604
Loss from operations	-67,519	-24,143	-9,519
Other income (expense)	-431	121	50
Interest expense	-7,386	-1,107	-1,016
Change in fair value of warrant liability			-369
Loss on debt extinguishment		-141
Loss before provision for income taxes	-75,336	-25,270	-10,854
Income tax (provision) benefit	-427	7,511	-67
Net loss attributable to common stockholders	($75,763)	($17,759)	($10,921)
Net loss per share attributable to common stockholders, basic and diluted	($2.03)	($0.54)	($0.87)
Weighted average shares used in computing net loss per share attributable to common stockholders, basic and diluted	37,335,200	33,129,572	12,538,769

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Convertible preferred stock [Member]
In Thousands, except Share data	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Convertible preferred stock [Member]
Beginning balance at Dec. 31, 2011	$3,039			$39,243	($36,204)
Beginning balance, Shares at Dec. 31, 2011		6,919,892				14,161,444
Issuance of common stock in connection with initial public offering, net of offering costs	89,447			89,447
Issuance of common stock in connection with initial public offering net of offering costs, Shares		5,900,000
Conversion of convertible preferred stock to common stock in connection with initial public offering	0	0	0	0	0	0
Conversion of convertible preferred stock to common stock in connection with initial public offering, Shares		14,161,444				-14,161,444
Conversion of preferred stock warrant to common stock warrant in connection with initial public offering	666			666
Exercises of common stock options	1,681			1,681
Exercises of common stock options, Shares		541,445
Non-cash exercise of common stock warrants	0	0	0	0	0	0
Non-cash exercise of common stock warrants, Shares		33,380
Shares returned from escrow related to acquisition of Movity, Inc.	-14			-14
Shares returned from escrow related to acquisition of Movity, Inc., Shares		-3,343
Stock-based compensation expense related to options granted to employees	2,636			2,636
Net loss and total comprehensive loss	-10,921				-10,921
Ending balance at Dec. 31, 2012	86,534			133,659	-47,125
Ending balance, Shares at Dec. 31, 2012		27,552,818
Issuance of common stock in connection with follow-on public offering, net of offering costs	98,144			98,144
Issuance of common stock in connection with secondary public offering net of offering costs, Shares		3,500,000
Issuance of additional shares of common stock in connection with follow-on public offering	14,878			14,878
Issuance of additional shares of common stock in connection with secondary offering, Shares		525,000
Issuance of common stock as consideration for Market Leader	189,296			189,296
Issuance of common stock as consideration for Market Leader, Shares		4,412,489
Assumption of stock-based awards in connection with the acquisition of Market Leader	12,871			12,871
Exercises of common stock options	7,003			7,003
Exercises of common stock options, Shares		1,484,251
Non-cash exercises of stock appreciation rights		32,169
Vesting of restricted stock units		151,164
Value and shares of equity awards withheld for tax liability and award exercises	-783			-783
Value and shares of equity awards withheld for tax liability and award exercises, Shares		-28,620
Non-cash exercise of common stock warrants	0	0	0	0	0	0
Non-cash exercise of common stock warrants, Shares		56,054
Warrants withheld for exercises, Shares		-16,849
Shares repurchases	-30,032			-30,032
Shares repurchases, Shares			-1,085,904
Stock-based compensation expense related to options granted to employees	20,924			20,924
Net loss and total comprehensive loss	-17,759				-17,759
Ending balance at Dec. 31, 2013	381,076			445,960	-64,884
Ending balance, Shares at Dec. 31, 2013		37,668,476	-1,085,904
Exercises of common stock options and stock appreciation rights	11,267			11,267
Exercises of common stock options and stock appreciation rights, Shares		997,431
Exercises of common stock options, Shares	911,538
Vesting of restricted stock units		757,438
Value and shares of equity awards withheld for tax liability and award exercises	-3,739			-3,739
Value and shares of equity awards withheld for tax liability and award exercises, Shares		-105,016
Stock-based compensation expense related to options granted to employees	47,324			47,324
Restructuring costs	82			82
Net loss and total comprehensive loss	-75,763				-75,763
Ending balance at Dec. 31, 2014	$360,247			$500,894	($140,647)
Ending balance, Shares at Dec. 31, 2014		39,318,329	-1,085,904

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	($75,763)	($17,759)	($10,921)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	28,772	12,211	3,585
Compensation paid in stock	44,933	22,973	2,570
Provision for doubtful accounts	-135	351	95
Loss on disposal of fixed assets	787	45
Release of valuation allowance		-7,923
Restructuring costs	2,708
Change in fair value of warrant liability			369
Amortization of debt discount		106	167
Amortization of debt issue cost	133	83	30
Amortization of underwriting fee	880	34
Loss on extinguishment of debt		141
Changes in operating assets and liabilities, net of acquisition of business:
Accounts receivable	-798	-5,005	-2,475
Prepaid expenses and other current assets	3,490	-6,467	-889
Other assets	-50		-13
Accounts payable	-267	-6,698	-864
Accrued liabilities and restructuring costs	1,996	3,309	1,811
Accrued compensation and benefits	-1,344	1,586	2,458
Deferred rent	7,308	4,935	-174
Deferred revenue	-682	-3,294	8,469
Other long-term liabilities	88		-65
Net cash provided by (used in) operating activities	12,056	-1,372	4,153
CASH FLOWS FROM INVESTING ACTIVITIES:
Increase in restricted cash and deposits	-5,128	-791	-764
Maturities of short-term investments		2,999	4,300
Purchases of property and equipment	-41,231	-16,572	-5,506
Disposals of property and equipment		34
Acquisition, net of cash acquired of $9.7 million in 2013		-160,813
Net cash used in investing activities	-46,359	-175,143	-1,970
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from initial public offering, net of underwriting discounts			93,279
Proceeds from follow-on public offering, net of underwriting discounts		114,056
Payments of costs related to public offerings		-1,034	-3,832
Proceeds from long-term debt		230,000
Repayments on long-term debt		-10,006
Payment of debt issuance costs		-6,910
Value of equity awards withheld for tax liability	-3,739	-783
Repayments on capital lease liability	-41	-200	-334
Proceeds from exercises of stock options	11,267	7,003	1,680
Shares repurchased		-30,032
Net cash provided by financing activities	7,487	302,095	90,793
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-26,816	125,580	92,976
CASH AND CASH EQUIVALENTS-Beginning of period	225,597	100,017	7,041
CASH AND CASH EQUIVALENTS-End of period	198,781	225,597	100,017
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest	6,290	696	791
Cash paid for income taxes	533	418	4
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Stock-based compensation capitalized in product development costs	3,114	685	66
Conversion of preferred stock warrants to common stock warrants			666
Purchases of equipment under capital leases		105	119
Net change related to purchases of equipment in accounts payable and accrued liabilities	-2,645	3,325	54
Purchases of equipment with accounts payable and accrued liabilities at period end	1,319	3,964	226
Release of valuation allowance		7,923
Other compensation to be paid in stock	$3,460	$2,524
Common stock issued and stock awards assumed in connection with Market Leader acquisition		5,340,271
Common stock warrants exercised in a net settlement transaction		56,054
Stock appreciation rights exercised in a net settlement transaction	85,893	32,169

Consolidated_Statements_of_Cas1

Consolidated Statements of Cash Flows (Parenthetical) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Statement of Cash Flows [Abstract]
Acquisition, cash acquired	$9.70

Organization_and_Description_o

Organization and Description of Business	12 Months Ended
Organization and Description of Business	Dec. 31, 2014
Accounting Policies [Abstract]
Organization and Description of Business	1. Organization and Description of Business
	We were incorporated on June 1, 2005 in the state of Delaware as Realwide, Inc. On September 22, 2005, we changed our name to Trulia, Inc.
	Our marketplace, delivered through the web and mobile applications, gives consumers powerful tools to research homes and neighborhoods and enables real estate professionals to efficiently market their listings and attract new clients. We also offer a comprehensive suite of free and subscription products that provide real estate professionals with access to transaction-ready consumers and help them grow and manage their online presence.
	Acquisition by Zillow Group, Inc.
	On July 28, 2014, we entered into an Agreement and Plan of Merger, or the Merger Agreement, with Zillow, Inc. (“Zillow”) and Zillow Group, Inc., f/k/a/ Zebra HoldCo, Inc., (“HoldCo”), pursuant to which both we and Zillow became wholly-owned subsidiaries of HoldCo, which series of transactions we refer to as the Zillow Merger.
	Upon completion of the Zillow Merger, (i) each outstanding share of our common stock was converted into the right to receive 0.444 of a share of Class A common stock of HoldCo; (ii) each outstanding share of Class A common stock of Zillow was converted into the right to receive one share of Class A common stock of HoldCo; and (iii) each outstanding share of Class B common stock of Zillow was converted into the right to receive one share of Class B common stock of HoldCo. The Class A common stock of HoldCo has one vote per share and the Class B common stock of HoldCo has ten votes per share, similar to the former capital structure of Zillow.
	In addition, subject to certain exceptions, each Trulia stock option, restricted stock unit and stock appreciation right outstanding immediately prior to the consummation of the Zillow Merger, whether or not vested and exercisable was assumed by HoldCo and converted into a corresponding equity award to purchase, acquire shares of, or participate in the appreciation in price of HoldCo Class A Common Stock. The terms of each assumed equity award are the same except that the number of shares subject to each equity award and the per share exercise price, if any, was adjusted based on the exchange ratio per a formula set forth in the Merger Agreement. See Note 16 for further details on this subsequent event.
	Convertible Senior Notes
	On December 17, 2013, we issued $230.0 million aggregate principal amount of 2.75% Convertible Senior Notes, due in 2020, (“2020 Notes”), which included $30.0 million of principal amount issued pursuant to an over-allotment option granted to the initial purchasers. The aggregate principal amount of the 2020 Notes is due on December 15, 2020. We received net proceeds of $222.4 million, after deducting offering expenses payable by us. Interest began to accrue on December 17, 2013 and is payable semi-annually every June 15 and December 15, starting on June 15, 2014. We may not redeem the 2020 Notes prior to December 20, 2018. We may redeem the 2020 Notes, at our option, in whole or in part on or after December 20, 2018, if the last reported sale price per share of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period. Holders of the 2020 Notes may convert all or any portion of their notes, in multiples of $1,000 principal amount, at their option at any time prior to the close of business on the business day immediately preceding the maturity date. The notes are convertible at an initial conversion rate of 27.8303 shares of our common stock per $1,000 principal amount of notes, subject to adjustment in certain events. In connection with our acquisition by Zillow, the 2020 Notes were assumed by HoldCo. Further details on the 2020 Notes are presented in Note 7 of these consolidated financial statements.

	Acquisition of Market Leader, Inc.
	In August 2013, we acquired all the outstanding shares of capital stock of Market Leader, Inc. (“Market Leader”) for 4,412,489 shares of our common stock and $170.5 million in cash. Market Leader is a provider of software-as-a-service (“SaaS”)-based customer relationship management software for the real estate sector. Under the terms and conditions of the Agreement and Plan of Merger (“Market Leader Merger Agreement”) each outstanding share of Market Leader common stock was converted into the right to receive (a) $6.00 in cash, without interest, and subject to applicable withholding tax, and (b) 0.1553 of a share of our common stock, for a total purchase consideration of $372.7 million. In connection with the merger, all of the outstanding stock options, stock appreciation rights and restricted stock units of Market Leader were converted into stock options, stock appreciation rights and restricted stock units, respectively, denominated in shares of our common stock based on formulas set forth in the Market Leader Merger Agreement. We have included Market Leader’s results of operations prospectively after August 20, 2013, the date of acquisition. Further details on this business combination are presented in Note 5 of these consolidated financial statements.
	In June 2014, our board of directors approved a restructuring plan to accelerate the integration of our Market Leader operations with those of Trulia, to eliminate overlapping positions, and to streamline operations. We implemented this restructuring plan to shorten the time to market for our products and to drive further growth. Further details on the restructuring are presented in Note 12 of these consolidated financial statements.
	Follow-on Public Offering
	In March 2013, we completed a follow-on public offering in which we sold an aggregate of 4,025,000 shares of our common stock, which included 525,000 shares sold pursuant to the exercise by the underwriters of an option to purchase additional shares, at a public offering price of $29.75 per share. In addition, another 3,117,311 shares were sold by certain selling stockholders, which included 406,606 shares sold pursuant to the exercise by the underwriters of an option to purchase additional shares. We received aggregate net proceeds of $113.0 million, after deducting underwriting discounts and commissions and offering expenses payable by us, from sales of our shares in the offering. We did not receive any of the proceeds from the sales of shares by the selling stockholders.
	Initial Public Offering
	In September 2012, we completed an initial public offering (“IPO”) in which we sold 5,900,000 shares of our common stock, which included 900,000 shares sold pursuant to the exercise by the underwriters of an option to purchase additional shares, at a public offering price of $17.00 per share. In addition, another 1,000,000 shares were sold by certain selling stockholders. We received net proceeds of $89.4 million, after deducting underwriting discounts and commissions and offering expenses payable by us, from sales of our shares in the IPO. We did not receive any proceeds from sales by the selling stockholders. Immediately prior to the completion of the IPO, all shares of the then-outstanding convertible preferred stock automatically converted into an aggregate of 14,161,444 shares of common stock, and an outstanding warrant to purchase convertible preferred stock automatically converted into a warrant to purchase up to 120,961 shares of common stock.
	Certain Significant Risks and Uncertainties
	We operate in a dynamic industry and, accordingly, can be affected by a variety of factors. For example, we believe that changes in any of the following areas could have a significant negative effect on our future financial position, results of operations, or cash flows: ability to obtain additional financing; advances and trends in new technologies and industry standards; changes in certain strategic relationships or customer relationships; market acceptance of our products; development of sales channels; loss of significant customers; litigation or other claims against us; the hiring, training, and retention of key employees; changes in enacted tax rates; and new product introductions by competitors.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies
	Basis of Presentation
	Our consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“US GAAP”).
	Principles of Consolidation
	The consolidated financial statements include the operations of Trulia and our wholly owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.
	Use of Estimates
	The preparation of the accompanying financial statements in conformity with US GAAP requires that we make estimates and assumptions about future events that affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. Significant items subject to such estimates include: revenue recognition; useful lives of property and equipment and intangible assets; recoverability of long-lived assets and intangible assets with definite lives; income tax uncertainties, including a valuation allowance for deferred tax assets; accounting for business combinations; restructuring reserves; and contingencies. We base these estimates on historical and anticipated results, trends, and various other assumptions that we believe are reasonable under the circumstances, including assumptions as to future events. These estimates form the basis for making judgments about the carrying values of assets and liabilities and recorded revenue and expenses that are not readily apparent from other sources. Actual results could differ from those estimates.
	Concentrations of Credit Risk and Credit Evaluations
	Financial instruments which potentially subject us to concentrations of credit risk consist principally of cash and cash equivalents, and trade accounts receivable. We deposit our cash and cash equivalents with major financial institutions that management believes are of high credit quality; however, at times, balances exceed federally insured limits.
	Our accounts receivable are derived from customers in the United States of America and Canada. We do not require our customers to provide collateral to support accounts receivable. We perform ongoing credit evaluations of our customers’ financial condition and maintain allowances for estimated credit losses. Actual credit losses may differ from our estimates. No customer represented 10% or more of total revenue during the years ended December 31, 2014, 2013 and 2012. No customer represented 10% or more of our gross accounts receivable as of December 31, 2014, and one customer accounted for 13.0% of the gross accounts receivable as of December 31, 2013.
	Revenue Recognition
	We recognize revenue when persuasive evidence of an arrangement exists, delivery has occurred, the price to the buyer is fixed or determinable, and collection is reasonably assured. We consider a signed agreement, a binding insertion order, or other similar documentation reflecting the terms and conditions under which products will be provided to be persuasive evidence of an arrangement. Collectability is assessed based on a number of factors, including payment history and the creditworthiness of a customer. If it is determined that collection is not reasonably assured, revenue is not recognized until collection becomes reasonably assured, which is generally upon receipt of cash.
	Our revenue is comprised of Marketplace revenue and Media revenue.

	Marketplace Revenue. Marketplace revenue primarily consists of products and services sold to real estate professionals, including agents, brokers, agents of property managers, builders, and mortgage lenders on a fixed fee subscription, Cost Per Click (“CPC”) or Cost Per Lead (“CPL”) basis. We currently sell four sets of products to real estate professionals on a subscription basis. The first set of products, which includes Trulia Local Ads and Trulia Mobile Ads, enables real estate professionals to promote themselves on our search results pages and property details pages for a local market area. Real estate professionals purchase subscriptions to these products based upon their specified market share for a city or zip code, at a fixed monthly price, for periods ranging from one month to one year, with pricing depending on demand, location, and the percentage of market share purchased. Our second set of products allows real estate professionals to receive prominent placement of their listings in our search results. Real estate professionals sign up for new subscriptions to this product at a fixed monthly price for periods that generally range from six months to 12 months. Our third set of products includes Trulia Seller Ads that enable real estate professionals to generate leads from consumers interested in selling their homes. Our fourth set of products is our comprehensive premium software-as-a-service based marketing products typically sold to real estate professionals as a bundle of products under a fixed fee subscription. We also sell a base version of these products to strategic franchise networks for specified contractual amounts over a number of years and partner with them to drive adoption of our premium solution across their network.
	Media Revenue. Media revenue primarily consists of display advertising sold on a Cost per Thousand (“CPM”), CPC, or CPL basis to advertisers promoting their brand on trulia.com, our mobile website, m.trulia.com, and our partners websites (cumulatively “Trulia Websites”). Impressions are the number of times an advertisement is loaded on a web page and clicks are the number of times users click on an advertisement. Revenue is recognized in the periods the clicks or impressions are delivered. Pricing is primarily based on advertisement size and position on the Trulia Websites and fees are generally billed monthly. As our mobile web pages and mobile applications offer less space on which to display advertising, a shift in user traffic from our websites to mobile products could decrease our advertising inventory and negatively affect our Media revenue. Recently, we have experienced a shift in user traffic as our mobile monthly unique visitors have continued to grow at a rapid pace and our monthly unique visitors have stayed relatively constant.
	Multiple-Element Arrangements
	We enter into arrangements with customers that include combinations of CPC media placements, CPM media placements, and subscription products.
	We allocate arrangement consideration in multiple-element revenue arrangements at the inception of an arrangement to all deliverables or those packages in which all components of the package are delivered at the same time, based on the relative selling price method in accordance with the selling price hierarchy, which includes: (i) vendor-specific objective evidence (“VSOE”), if available; (ii) third-party evidence (“TPE”), if VSOE is not available; and (iii) best estimate of selling price (“BESP”), if neither VSOE nor TPE is available.
	VSOE- We determine VSOE based on our historical pricing and discounting practices for the specific product when sold separately. In determining VSOE, we require that a substantial majority of the standalone selling prices for these products fall within a reasonably narrow pricing range. For certain subscription products, we have been able to establish VSOE.
	TPE- When VSOE cannot be established for deliverables in multiple-element arrangements, we apply judgment with respect to whether it can establish a selling price based on TPE. TPE is determined based on competitor prices for similar deliverables when sold separately. Generally, our go-to-market strategy differs from that of our peers and our offerings contain a significant level of differentiation such that the comparable pricing of the products cannot be obtained. Furthermore, we are unable to reliably determine what similar competitor selling prices are on a standalone basis. As a result, we have not been able to establish selling price based on TPE.
	BESP- When we are unable to establish selling price using VSOE or TPE, we use BESP in our allocation of arrangement consideration. The objective of BESP is to determine the price at which we would transact a sale if the service was sold regularly on a standalone basis. As we have not been able to establish VSOE or TPE for CPM media placements, CPC media placements, and certain subscription products, we determine BESP for these deliverables based on the following:

		•		The list price represents a component of the go-to-market strategy established by senior management. Our list prices are based on the features of the products offered. These features, which consist of the size and placement of the advertisements on our website, impact the list prices which vary depending on the specifications of the features. In addition, the list prices are impacted by market conditions, including the conditions of the real estate market and economy in general, and our competitive landscape; and

		•		Analysis of our selling prices for these deliverables.
	We limit the amount of allocable arrangement consideration to amounts that are fixed or determinable and that are not contingent on future performance or future deliverables. We regularly review BESP. Changes in assumptions or judgments or changes to the elements in the arrangement could cause a material increase or decrease in the amount of revenue that we report in a particular period.
	We recognize the relative fair value of the products as they are delivered assuming all other revenue recognition criteria are met.
	Cost of Revenue
	Cost of revenue consists primarily of expenses related to operating our websites and mobile applications, including those associated with the operation of our data centers and customer websites, hosting fees, customer service related headcount expenses including salaries, bonuses, benefits and stock-based compensation expense, cost to generate leads for customers, licensed content, multiple listing services fees, revenue sharing costs, credit card processing fees, third-party contractor fees, and allocated overhead.
	Technology and Development
	Costs to research and develop our products are expensed as incurred. These costs consist primarily of technology and development headcount related expenses including salaries, bonuses, benefits and stock-based compensation expense, third party contractor fees and allocated overhead primarily associated with developing new technologies. Technology and development also includes amortization of capitalized costs (“product development costs”) associated with the development of our marketplace.
	Product Development Costs
	Product development costs include costs related to the development of our marketplace which is inclusive of costs related to the development of our delivery points, the website and mobile applications. Product development costs are accounted for as follows: all costs incurred in the preliminary project and post-implementation stages are expensed as incurred, while certain costs incurred in the application development stage of a new product or projects to provide significant additional functionality to existing products are capitalized, if certain criteria are met. Maintenance and enhancement costs are typically expensed as incurred. We capitalized costs associated with product development of $19.1 million, $8.2 million and $2.5 million during the years ended December 31, 2014, 2013 and 2012, respectively, and recorded related amortization expense of $6.4 million, $2.7 million and $1.1 million during the years ended December 31, 2014, 2013 and 2012, respectively. The net book value of capitalized product development costs was $11.5 million and $7.5 million as of December 31, 2014 and 2013, respectively. Such costs are amortized on a straight-line basis over the estimated useful lives of the related assets, which have been estimated to be two years. Amortization expense is included in technology and development in the statements of operations.

	Advertising Expense
	Advertising costs are expensed when incurred and are included in sales and marketing expenses. Barter transactions represent the exchange of online advertising through placement of links. No revenue or expense for such barter transactions is recognized because the fair value of neither the advertising surrendered nor the advertising received is determinable.
	Our advertising expense was $33.8 million, $7.7 million and $2.6 million during the years ended December 31, 2014, 2013, and 2012, respectively.
	Stock-Based Compensation
	We recognize compensation costs related to stock options and restricted stock units granted to employees based on the estimated fair value of the awards on the date of grant, net of estimated forfeitures. We measure the grant date fair value of stock options and stock appreciation rights using the Black-Scholes option-pricing model. Grant date fair value of restricted stock units equals the fair value of our common stock on the date of grant. These fair values are recognized on a straight-line basis over the requisite service period, which is the vesting period of the respective awards.
	We account for equity awards issued to nonemployees based on the fair value of these awards, similar to employee awards. This fair value is remeasured at the end of each reporting period and the resulting change in value, if any, is recognized in the statement of operations as cumulative compensation cost during the period the related services are rendered.
	Income Taxes
	We account for income taxes in accordance with the asset and liability method. Under this method, deferred tax assets and liabilities are measured based on differences between the financial reporting and the tax bases of assets and liabilities using enacted tax rates that are expected to be in effect when the differences are expected to reverse. A valuation allowance is established to reduce net deferred tax assets to amounts that are more likely than not to be realized.
	We account for uncertainty in tax positions recognized in the financial statements by recognizing a tax benefit from an uncertain tax position when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, based on the technical merits. Income tax positions must meet a more-likely-than-not recognition threshold at the effective date to be recognized.
	Our policy for classifying interest and penalties associated with unrecognized income tax benefits is to include such items as tax expense.
	Restructuring Costs
	The main components of our restructuring plan relate to workforce reduction and contract termination costs. Workforce reduction charges are accrued when it is probable that the employees are entitled to the severance payments and the amounts can be reasonably estimated. One-time involuntary termination benefits are accrued when the plan of termination has been communicated to the employees and certain other criteria are met. Contract termination costs are recognized as a liability when a contract is terminated in accordance with its terms, or at the cease-use date. If the amounts and timing of cash flows from restructuring activities are significantly different from what we have estimated, the actual amount of restructuring and other related charges could be materially different than those we have recorded. Further details on the restructuring are presented in Note 12 of these audited consolidated financial statements.

	Comprehensive Loss
	During the years ended December 31, 2014, 2013 and 2012, we did not have any other comprehensive income and, therefore, the net loss and comprehensive loss were the same for all periods presented.
	Net Loss per Share Attributable to Common Stockholders
	We calculate the basic and diluted net loss per share attributable to common stockholders in conformity with the two-class method required for companies with participating securities. Immediately prior to the completion of our IPO in September 2012, all shares of outstanding preferred stock automatically converted into 14,161,444 shares of common stock. In addition, our outstanding preferred stock warrants converted into 56,054 common stock warrants. Under the two-class method, in periods when we have net income, net income attributable to common stockholders is determined by allocating undistributed earnings, calculated as net income less current period convertible preferred stock non-cumulative dividends, between common stock and the convertible preferred stock. In computing diluted net income attributable to common stockholders, undistributed earnings are re-allocated to reflect the potential impact of dilutive securities. Our basic net loss per share attributable to common stockholders is calculated by dividing the net loss attributable to common stockholders by the weighted average number of shares of common stock outstanding for the period. The diluted net loss per share attributable to common stockholders is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, options to purchase common stock, and common stock warrants are considered common stock equivalents but have been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect is antidilutive.
	Cash and Cash Equivalents
	Cash and cash equivalents include cash and highly liquid investments with original maturities of three months or less at the time of acquisition. Our cash equivalents consist of money market funds. All credit card and debit card transactions that process as of the last day of the fiscal year and settle within a few days in the subsequent period are also classified as cash and cash equivalents. The amounts due from the third party merchant processors for these transactions classified as cash totaled $469,000 and $349,000 as of December 31, 2014 and 2013, respectively.
	Accounts Receivable and Allowance for Doubtful Accounts
	We perform ongoing credit evaluations of our customers. Accounts receivable are recorded at invoiced amounts, net of our estimated allowances for doubtful accounts. The allowance for doubtful accounts is estimated based on an assessment of our ability to collect on customer accounts receivable. We regularly review the allowance by considering certain factors such as historical experience, industry data, credit quality, age of accounts receivable balances and current economic conditions that may affect a customer’s ability to pay. In cases where we are aware of circumstances that may impair a specific customer’s ability to meet their financial obligations, we record a specific allowance against amounts due from the customer and thereby reduce the net recognized receivable to the amount we reasonably believe will be collected. We write-off accounts receivable against the allowance when we determine the balance is uncollectible and no longer actively pursue collection of the receivable. We recorded a provision for uncollectible accounts receivable of $(135,000), $351,000 and $95,000 during the years ended December 31, 2014, 2013, and 2012, respectively.
	Restricted Cash
	Restricted cash consists of certificates of deposit held as collateral at a financial institution related to property leases in our name, and to insure the corporate credit card spending. These certificates of deposit have contractual maturities of less than three years. The balance of the restricted cash was $6.7 million and $1.6 million as of December 31, 2014 and 2013, respectively.

	Property and Equipment
	Property and equipment is initially recorded at cost and depreciated using a straight-line method over the estimated useful lives of the assets. Maintenance and repair costs are charged to expense as incurred. The useful lives of our property and equipment are as follows:


	Computer equipment		2 to 3 years
Office equipment, furniture and fixtures		3 years
Capitalized product development costs		2 to 3 years
Network equipment		5 years
Leasehold improvements		Shorter of the lease term or 5 years
Depreciation expense of assets acquired through capital leases is included within respective functional expenses in the statements of operations.
Business Combination
We recognize identifiable assets acquired and liabilities assumed at their acquisition date fair values. Goodwill is measured as the excess of the consideration transferred over the net fair value of assets acquired and liabilities assumed on the acquisition date. While we use our best estimates and assumptions as part of the purchase price allocation process to accurately value assets acquired and liabilities assumed, our estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, we may record adjustments to the assets acquired and liabilities assumed, with the corresponding offset to goodwill to the extent that we identify adjustments to the preliminary purchase price allocation. Upon conclusion of the measurement period or final determination of the values of the assets acquired and liabilities assumed, whichever comes first, any subsequent adjustments are recorded to our consolidated statements of operations.
Purchased Intangible Assets
Purchased intangible assets with a determinable economic life are carried at cost, less accumulated amortization. Amortization is computed over the estimated useful life of each asset on a straight-line basis. The useful lives of the purchased intangible assets are as follows:


Enterprise relationships			10 years
Premium users			5 years
Existing technology			7 years
Trade names			10 years
Home/MLS data feeds			10 years
Purchased intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of assets to be held and used is measured first by a comparison of the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset. If such assets are considered to be impaired, an impairment loss would be recognized when the carrying amount of the asset exceeds the fair value of the asset.
Goodwill
Goodwill represents the excess of the aggregate purchase price paid over the fair value of the net identifiable assets acquired. Goodwill is not amortized and is tested for impairment at least annually or whenever events or changes in circumstances indicate that the carrying value may not be recoverable. We have determined that we operate as one reporting unit and have selected December 1 as the date to perform our annual impairment test. In the valuation of our goodwill, we must make assumptions regarding estimated future cash flows to be derived from our business. If these estimates or their related assumptions change in the future, we may be required to record impairment for these assets. The first step of the impairment test involves comparing the fair value of the reporting unit to its net book value, including goodwill. If the net book value exceeds its fair value, then we would perform the second step of the goodwill impairment test to determine the amount of the impairment loss. The impairment loss would be calculated by comparing the implied fair value of the entity to its net book value. In calculating the implied fair value of our goodwill, the fair value of the entity would be allocated to all of the other assets and liabilities based on their fair values. The excess of the fair value of the entity over the amount assigned to the other assets and liabilities is the implied fair value of goodwill. An impairment loss would be recognized when the carrying amount of goodwill exceeds its implied fair value. We had no impairment of goodwill in the years ended December 31, 2014, 2013, or 2012.
Impairment of Long-Lived Assets
Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of assets to be held and used is measured first by a comparison of the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset. If such assets are considered to be impaired, an impairment loss would be recognized when the carrying amount of the asset exceeds the fair value of the asset. To date, we believe that no such impairment has occurred.
Deferred Revenue
Deferred revenue consists of prepaid but unrecognized subscription revenue, advertising fees received or billed in advance of delivery and for amounts received in instances when revenue recognition criteria have not been met. Deferred revenue is recognized when all revenue recognition criteria have been met.
Segment Information
We have one reportable segment. Our reportable segment has been identified based on how our chief operating decision maker manages our business, makes operating decisions and evaluates operating performance. The chief executive officer acts as the chief operating decision maker and reviews financial and operational information on an entity-wide basis.
Recently Issued Accounting Pronouncements
In November 2014, the Financial Accounting Standards Board, or FASB, issued the Accounting Standards Update No. 2014-17, “Business Combinations (Topic 805),” (“ASU 2014-17”). ASU 2014-17 provides an acquired entity an option to apply pushdown accounting in its separate financial statements when a change in control occurs. The acquired entity may make this election in the subsequent period, which will constitute a change in accounting principle. If pushdown accounting option is elected for a specific change in control event, that election is irrevocable. We adopted this guidance prospectively from its effective date of November 18, 2014. Adoption of this guidance has no impact on our financial position, results of operations or cash flows in the current or future periods.
In May 2014, the FASB issued the Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers,” (“ASU 2014-09”). ASU 2014-09 requires entities to recognize revenue for promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange. Additionally, entities should have sufficient disclosures about nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. This guidance is effective for interim and annual reporting periods beginning after December 15, 2016. Early adoption is not permitted. We expect to adopt this guidance on January 1, 2017. We are in the process of assessing the impact on our financial position, results of operations and cash flows from the adoption of this guidance.

In July 2013, the FASB issued Accounting Standards Update No. 2013-11, “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or Tax Credit Carryforward Exists,” (“ASU 2013-11”). ASU 2013-11 requires entities to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward when settlement in this manner is available under the tax law. This guidance is effective for interim and annual reporting periods beginning after December 15, 2013, with earlier adoption permitted, and may be applied prospectively or retrospectively. We adopted this guidance on January 1, 2014. Adoption of this guidance has no impact on our financial position, results of operations or cash flows in the current or future periods.
In February 2013, the FASB issued Accounting Standards Update No. 2013-02, “Comprehensive Income,” (“ASU 2013-02”). ASU 2013-02 requires entities to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income, if the amount being reclassified is required under US GAAP to be reclassified in its entirety to net income. For other amounts that are not required under US GAAP to be reclassified in their entirety from accumulated other comprehensive income to net income in the same reporting period, an entity is required to cross-reference other disclosures required under US GAAP that provide additional detail about those amounts. This pronouncement is effective for fiscal years beginning after December 15, 2012. We adopted this guidance on January 1, 2013 prospectively. In the years ended December 31, 2014, 2013 and 2012, we did not have any other comprehensive income and, therefore, the net loss and comprehensive loss was the same for all periods presented.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
Fair Value Measurements	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	3. Fair Value Measurements
	Fair value is defined as the exchange price that would be received for an asset or an exit price paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The current accounting guidance for fair value measurements defines a three-level valuation hierarchy for disclosures as follows:
	Level I—Unadjusted quoted prices in active markets for identical assets or liabilities;
	Level II—Inputs, other than quoted prices included within Level I, that are observable, unadjusted quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data; and
	Level III—Unobservable inputs that are supported by little or no market activity, which requires us to develop our own assumptions.
	The categorization of a financial instrument within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement.
	The carrying values of our financial instruments, including cash equivalents, accounts receivable, accounts payable, and restricted cash, approximate their fair values. The estimated fair value and carrying value of our 2020 Notes were $343.6 million and $230.0 million, respectively, as of December 31, 2014, and $252.0 million and $230.0 million, respectively, as of December 31, 2013. We determined the estimated fair value of the 2020 Notes through use of binomial option pricing model. The fair value is classified as Level III due to the use of significant unobservable inputs such as estimated long-term volatility of our common stock and credit risk premium.
	We determined the fair value of the 2020 Notes using the following assumptions:


		As of December 31, 2014
	Stock price	$46.03
	Time to maturity	5.96 years
	Volatility	51%
	Risk free rate	1.80%
	Discount spread	8.5% - 10.5%

	During the year ended December 31, 2012, we recognized a charge to earnings of $369,000 from remeasurement of the fair value of warrants to purchase preferred stock when they were converted into warrants to purchase common stock on the day of our IPO.
	Fair Value Measurements on a Recurrent Basis (in thousands):


		As of December 31, 2014
		Level I		Level II		Level III		Total
	Financial Assets:
	Money market funds	$	6,683	$	—	$	—	$	6,683
	Restricted cash		6,717		—		—		6,717

	Total financial assets	$	13,400	$	—	$	—	$	13,400


		As of December 31, 2013
		Level I		Level II		Level III		Total
	Financial Assets:
	Money market funds	$	6,683	$	—	$	—	$	6,683
	Restricted cash		1,589		—		—		1,589

	Total financial assets	$	8,272	$	—	$	—	$	8,272

	None of the cash equivalents or the restricted cash held by us had unrealized losses and there were no realized losses for the years ended December 31, 2014 and 2013. There were no other-than-temporary impairments for these instruments as of December 31, 2014 or 2013. In the year ended December 31, 2014, our restricted cash increased by $5.1 million, of which $3.8 million was related to our new lease agreement in San Francisco, and $968,000 related to the amendment of our continuing lease agreement in Denver. As of December 31, 2014, the contractual maturities of all certificates of deposit were less than three years.

Balance_Sheet_Components

Balance Sheet Components	12 Months Ended
Balance Sheet Components	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Components	4. Balance Sheet Components
	Property and Equipment
	Property and equipment consists of the following (in thousands):


		As of December 31,
		2014			2013
	Computer equipment	$	8,534		$	7,275
	Capitalized product development costs		21,822			9,934
	Furniture and fixtures		5,323			3,276
	Leasehold improvements		22,209			8,985
	Software		1,908			183
	Assets not yet in service		10,879			3,868

	Total property and equipment		70,675			33,521
	Less: accumulated depreciation and amortization		(20,920	)		(11,232	)

	Total property and equipment, net	$	49,755		$	22,289

	Depreciation expense during the years ended December 31, 2014, 2013, and 2012 was $13.1 million, $6.4 million and $3.6 million, respectively.

	Accrued Liabilities
	Accrued liabilities consist of the following (in thousands):


		As of December 31,
		2014			2013
	Legal and professional fees	$	1,344		$	2,253
	Marketing and advertising expenses		2,494			1,326
	Interest		316			246
	Sales taxes		3,190			2,355
	Payroll taxes		426			651
	Acquisition of property and equipment		1,216			3,084
	Restructuring costs		2,857			—
	Other		2,040			1,346

	Total accrued liabilities	$	13,883		$	11,261

	Accrued Compensation and Benefits
	Accrued compensation and benefits consist of the following (in thousands):


		As of December 31,
		2014			2013
	Bonus	$	3,579		$	3,645
	Payroll and related expenses		3,121			3,191
	Commissions		2,160			2,166
	Vacation		1,727			1,861

	Total accrued compensation and benefits	$	10,587		$	10,863

Acquisition_of_Market_Leader

Acquisition of Market Leader	12 Months Ended
Acquisition of Market Leader	Dec. 31, 2014
Business Combinations [Abstract]
Acquisition of Market Leader	5. Acquisition of Market Leader
	During the third quarter of fiscal year 2013, we acquired all the outstanding shares of capital stock of Market Leader, Inc. for 4,412,489 shares of our common stock and $170.5 million in cash. Market Leader is a provider of software-as-a-service (“SaaS”)-based customer relationship management software for the real estate sector. Under the terms and conditions of the Market Leader Merger Agreement, each outstanding share of Market Leader common stock was converted into the right to receive (a) $6.00 in cash, without interest, and subject to applicable withholding tax, and (b) 0.1553 of a share of the Company’s common stock, for a total purchase price of $372.7 million. In connection with the merger, all of the outstanding stock options, stock appreciation rights and restricted stock units of Market Leader were converted into stock options, stock appreciation rights and restricted stock units, respectively, denominated in shares of our common stock based on formulas set forth in the Market Leader Merger Agreement. We have included Market Leader’s results of operations prospectively after the acquisition date of August 20, 2013.
	The acquisition adds additional products and services to our offerings for real estate professionals. With these additional products, we now offer products and services that encompass the entire real estate agent workflow—from generating and capturing initial leads through nurturing those leads into clients and real estate transactions. The acquisition has also added new customers, technology assets and intellectual property assets.
	The purchase price of $372.7 million reflects the cash amount paid and the fair value of our common stock transferred as consideration for all outstanding shares of Market Leader, and the fair value of pre-combination services of Market Leader employees reflected in the vested equity awards assumed by us in the acquisition. The purchase price components are summarized in the following table (in thousands):


	Cash paid for the outstanding stock of Market Leader		$	170,497
	Fair value of common stock transferred as consideration for the outstanding stock of Market Leader (4,412,489 shares)			189,296
	Fair value of vested equity awards assumed by us			12,871

	Total purchase price		$	372,664

	The fair value of the 4,412,489 shares of our common stock issued as part of the consideration paid for Market Leader was determined on the basis of the closing market price of our common stock on the acquisition date. The fair value of the vested equity awards was determined by using a Black-Scholes option pricing model with the applicable assumptions as of the acquisition date.
	The fair value of Market Leader unvested stock awards (that were converted to our awards) related to post-combination services of Market Leader employees were recorded and continue to be recorded as share-based compensation expense over the respective vesting periods after the acquisition date.
	For this business combination the measurement period allowed by FASB Accounting Standards Codification Topic 805, “Business Combinations” (“ASC 805”), expired and the purchase price allocation to the net tangible and intangible assets was finalized on August 20, 2014. No adjustments to the purchase price were made during the measurement period. The excess of the purchase price over the fair value of net identifiable assets was recorded as goodwill. Goodwill recorded as a result of this acquisition includes intangible assets that do not qualify for separate recognition, such as the assembled workforce and anticipated synergies from complementary products and largely non-overlapping customer bases. Goodwill is not deductible for income tax purposes. Our purchase price allocation is as follows (in thousands):


	Cash		$	9,662
	Short-term investments			2,999
	Other identifiable tangible assets			3,732

	Total tangible assets			16,393

	Accounts payable			(7,058	)
	Accrued expenses and other current liabilities			(3,104	)
	Accrued compensation and benefits			(2,253	)
	Other identifiable liabilities			(8,163	)

	Total liabilities			(20,578	)

	Net acquired tangible assets			(4,185	)

	Identifiable intangible assets			123,100
	Goodwill			253,749

	Total purchase price allocation		$	372,664

	We acquired a net deferred tax liability of $7.9 million related to Market Leader in this business combination.

	Intangible assets acquired consist of the following (in thousands):


							Estimated
							Amortization
							Period
							(in years)
	Enterprise relationships		$	29,000				10
	Premium users			15,200				5
	Existing technology			32,300				7
	Trade names			42,900				10
	Home/MLS data feeds			3,700				10

	Total intangible assets acquired		$	123,100

	Enterprise relationships consist of contracts with national real estate franchisors that serve as channels for selling Market Leader products and services to real estate agents. Premium users consist of real estate professionals and brokerages that purchase enhanced versions of Market Leader’s products and services. Existing technology consists of software products and supporting technology infrastructure developed by Market Leader. Trade names includes the several registered trademarks, logos and domain names owned by Market Leader, including Market Leader, House Values and Sharper Agent. MLS data feeds means the contractual rights to display for sale home listings from hundreds of multiple listing services in the United States.
	The estimated fair value of the intangible assets acquired was determined by us, and we considered or relied in part upon a valuation report of a third-party expert. We used an income approach to measure the fair value of the enterprise relationships based on the multi-period excess earnings method, whereby the fair value is estimated based upon the present value of cash flows that the applicable asset is expected to generate. We used an income approach to measure the fair value of the customer relationships based on the multi-period excess earnings method, whereby the fair value is estimated based upon the present value of cash flows that the applicable asset is expected to generate. We used an income approach to measure the fair values of the developed technology and trade names based on the relief-from-royalty method. We used a cost approach to measure the fair value of the home/MLS data feed based on the estimated cost to replace the data feed library.
	Net tangible assets were valued at their respective carrying amounts, as we believe that these amounts approximated their current fair values on the date of acquisition.
	Acquisition-related costs, including legal and accounting fees and other external costs directly related to the acquisition, were expensed as incurred. Acquisition-related costs of $6.1 million for the year ended December 31, 2013 are included as a separate line item in our combined statement of operations.
	The following pro forma condensed combined financial information gives effect to the acquisition of Market Leader as if it was consummated on January 1, 2012 (the beginning of the comparable prior reporting period), and includes pro forma adjustments related to the amortization of acquired intangible assets, share-based compensation expense and direct and incremental transaction costs reflected in the historical financial statements. Direct and incremental transaction costs are excluded from the annual period ended December 31, 2013 pro forma condensed combined financial information presented below, and included in the annual period ended December 31, 2012 pro forma condensed combined financial information presented below. The tax benefit of $6.7 million that resulted from the acquisition is recorded in the annual period ended December 31, 2012 pro-forma period. The pro forma condensed combined financial information is presented for informational purposes only. The pro forma condensed combined financial information is not intended to represent or be indicative of the results of operations that would have been reported had the acquisition occurred on January 1, 2012 and should not be taken as representative of future results of operations of the combined company. The following table presents the unaudited pro forma condensed combined financial information (in thousands, except per share amounts). Market Leader’s portion of the revenue and net loss in the period from the acquisition and through December 31, 2013 were $21.2 million and $9.3 million, respectively.


			Years Ended December 31,
			2013				2012
	Revenue		$	178,151			$	113.073
Net loss attributable to common shareholders		$	(33,056	)		$	(49,461	)
Net loss per share attributable to common shareholders—basic and diluted		$	(0.92	)		$	(2.92	)

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
Goodwill and Intangible Assets	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	6. Goodwill and Intangible Assets
	Goodwill
	Goodwill recorded as a result of the Market Leader acquisition includes intangible assets that do not qualify for separate recognition, such as the assembled workforce and anticipated synergies from complimentary products and largely non-overlapping customer bases. Goodwill balance as of December 31, 2014 and 2013 was as follows:


	Balance as of December 31, 2012	$	2,155
	Goodwill recorded in connection with the acquisition of Market Leader		253,749

	Balance as of December 31, 2013		255,904
	Change in goodwill		—

	Balance as of December 31, 2014	$	255,904

	Intangible Assets
	The following table presents the detail of intangible assets subject to amortization (in thousands):


		Year Ended December 31, 2014
		Cost		Accumulated			Net
		Cost		Amortization			Net
	Enterprise relationships	$	29,000	$	(3,952	)	$	25,048
	Premium users		15,200		(4,143	)		11,057
	Existing technology		32,300		(6,289	)		26,011
	Trade names		42,900		(5,847	)		37,053
	Home/MLS data feeds		3,700		(504	)		3,196
	Other		891		(689	)		202

	Total	$	123,991	$	(21,424	)	$	102,567



		Year Ended December 31, 2013
		Cost		Accumulated			Net
		Cost		Amortization			Net
	Enterprise relationships	$	29,000	$	(1,052	)	$	27,948
	Premium users		15,200		(1,103	)		14,097
	Existing technology		32,300		(1,675	)		30,625
	Trade names		42,900		(1,557	)		41,343
	Home/MLS data feeds		3,700		(134	)		3,566
	Other		701		(392	)		309

	Total	$	123,801	$	(5,913	)	$	117,888


	Amortization expense recorded for intangible assets for the years ended December 31, 2014 and 2013 was $15.7 million and $5.8 million, respectively.
	Future amortization expense is expected to be as follows over each of the next five years (in thousands):


		Total
	2015	$	15,311
	2016		15,230
	2017		15,230
	2018		14,127
	2019		12,190
	Thereafter		30,479

	Total	$	102,567

Debt

Debt	12 Months Ended
Debt	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt	7. Debt
	Convertible Senior Notes
	On December 17, 2013, we issued $230.0 million aggregate principal amount of the 2020 Notes, which included $30.0 million of principal amount issued pursuant to an over-allotment option granted to the initial purchasers. The aggregate principal amount of the 2020 Notes is due on December 15, 2020. We received net proceeds of $222.4 million after deducting offering expenses payable by us. The effective interest rate on the 2020 Notes is not materially different from the stated interest rate of 2.75%.
	We pay 2.75% interest per annum on the outstanding principal amount of the 2020 Notes semi-annually on June 15 and December 15 of each year beginning on June 15, 2014. Interest began to accrue on December 17, 2013. The 2020 Notes are unsecured senior obligations of Trulia. These 2020 Notes were offered and sold only to qualified institutional investors, as defined in Rule 144 under the Securities Act of 1933 (“Securities Act”), and the 2020 Notes and the shares of our common stock issuable upon conversion of the 2020 Notes have not been registered under the Securities Act.
	We may not redeem the 2020 Notes prior to December 20, 2018. We may redeem the 2020 Notes, at our option, in whole or in part on or after December 20, 2018, if the last reported sale price per share of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period.
	Holders of the 2020 Notes may convert all or any portion of their notes, in multiples of $1,000 principal amount, at their option at any time prior to the close of business on the business day immediately preceding the maturity date. The 2020 Notes are convertible at an initial conversion rate of 27.8303 shares of our common stock per $1,000 principal amount of notes. This is equivalent to an initial conversion price of approximately $35.93 per share of our common stock. The conversion rate will be adjusted for certain dilutive events and will be increased in the case of corporate events that constitute a “Make-Whole Fundamental Change” (as defined in the indenture governing the notes). The holders of the 2020 Notes will have the ability to require us to repurchase the notes in whole or in part upon the occurrence of an event that constitutes a “Fundamental Change” (as defined in the indenture governing the notes including such events as a “change in control” or “termination of trading”). In such case, the repurchase price would be 100% of the principal amount of the 2020 Notes plus accrued and unpaid interest, if any, to, but excluding, the fundamental change repurchase price. Certain events are also considered “Events of Default,” which may result in the acceleration of the maturity of the 2020 Notes, as described in the indenture governing the notes, including, among other events, our failure to file with the SEC the reports required pursuant to Section 13 or 15(d) of the Securities Exchange of 1934, as amended, within 180 days after the time such report was required to be filed. There are no financial covenants to these 2020 Notes.

	The conversion option of the 2020 Notes has no cash settlement provisions. Total issuance costs for the 2020 Notes were $7.6 million. We use the effective interest method to amortize the debt issuance costs. We believe that the conversion option does not meet the criteria for separate accounting as a derivative as it is indexed to our own stock.
	In connection with the completion of the Zillow Merger on February 17, 2015, the 2020 Notes became obligations of HoldCo, and became convertible for shares of HoldCo Class A common stock. Additional details on the Merger Agreement and the Zillow Merger are presented in Notes 1 and 14 of these consolidated financial statements.
	The estimated fair value of the 2020 Notes as of December 31, 2014 and 2013 was $343.6 million and $252.0 million, respectively. We recognized interest expense and amortization of debt issue costs related to the 2020 Notes in the year ended December 31, 2014, and for the period from December 17, 2013 through December 31, 2013 of $7.3 million and $284,000, respectively.
	Credit Facility
	In September 2011, we entered into a $20.0 million loan and security agreement which provided for a secured term loan facility (“Credit Facility”) issuable in tranches, with a financial institution. Under the Credit Facility, the first tranche of $5.0 million was drawn down in full in September 2011 and was used to repay our outstanding debt at the time. The second tranche of $5.0 million was also drawn down in full in September 2011. The Credit Facility carried an interest rate equal to the greater of the prime rate plus 2.75% or 6% for the first tranche, and a rate equal to the greater of the prime rate plus 5.5% or 8.75% for the second and third tranches. The loan facility was subject to interest-only payments through September 2012, which was repayable in 30 equal monthly installments of principal and interest after the interest-only period, and had a maturity date of March 2015. However, during the six months ended June 30, 2012, we achieved certain financial milestones under the Credit Facility which provided for the extension of: a) the drawdown period from August 2012 to December 2012, b) the beginning of the interest-only period from September 2012 to March 2013, and c) the maturity date from March 2015 to September 2015. On December 31, 2012, the drawdown period for the remaining $10.0 million expired.
	In conjunction with the Credit Facility, we issued warrants to purchase up to 120,961 shares of our stock as follows: (1) shares of Series D convertible preferred stock with an exercise price equal to $8.4738 per share or (2) shares of the next round of preferred stock financing at the per share price for such shares upon drawdown of the entire loan amount. Of this amount, warrants to purchase 56,054 shares of Series D convertible preferred stock became exercisable upon the drawdown of the first and second tranches and have an exercise price of $8.4738 per share. At the time of issuance, the aggregate fair value of these warrants was $281,000. We also paid a net facility charge of $165,000 upon drawdown of the first tranche of the loan. The fair value of warrants and net facility charge were recorded as debt discount to be amortized as interest expense over the contractual term of the loan agreement using the effective interest rate method. As a result of the debt discount, the effective interest rate for the Credit Facility differed from the contractual rate. During the years ended December 31, 2013 and 2012, we recognized interest expense related to amortization and write off of the remaining debt discount in the amount of $241,000 and $167,000, respectively. The warrants were net exercised in February 2013 and were no longer outstanding as of December 31, 2013.
	On December 17, 2013 when the outstanding balance of the Credit Facility was $7.2 million, we repaid it with the proceeds from the 2020 Notes discussed above. We recorded a loss on debt extinguishment of $141,000.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	8. Commitments and Contingencies
	Operating Leases
	We lease our corporate offices under noncancelable operating leases in San Francisco, Bellevue, Denver, and New York that range from one to nine years in term.
	On March 10, 2014, we entered into a lease agreement (“Lease”) effective November 1, 2014, for approximately 79,000 square feet of new office space at 535 Mission Street in San Francisco that houses our principal executive office. This office space replaced our former principal office at 116 New Montgomery Street in San Francisco, for which the lease expired in the fourth quarter of 2014. On July 25, 2014, we entered into a lease amendment under which we will lease an additional 26,620 square feet of office space commencing in October 2015 under the same terms and conditions. The term of the Lease is approximately 107 months and the future minimum lease payments range from $182,000 to $347,000 per month.
	On April 10, 2014, we entered into a lease effective May 1, 2014 for approximately 65,000 square feet of office space in the Denver metropolitan area. The term of the lease is approximately 90 calendar months and the future minimum lease payments range from $124,000 to $141,000 per month, starting in November 2014 after a six month rent abatement period.
	In September 2013, we entered into a lease effective through September 2021 for approximately 72,000 square feet of office space that houses our offices in Bellevue, WA. The term of the lease is approximately 97 calendar months and the future minimum lease payments range from $193,000 to $235,000 per month, starting in October 2014, after a 13 month rent abatement period.
	We lease additional office space in New York area. We believe our facilities are sufficient for our current needs.
	Rent expense from the leases of the facilities we currently occupy is recognized on a straight-line basis over the lease term. The rent expense for the years ended December 31, 2014 and 2013 was $5.7 million and $3.6 million, respectively.
	As of December 31, 2014, our minimum payments under the noncancelable operating leases were as follows (in thousands):


	Year Ending December 31:	Operating
		Lease
	2015	$	7,128
	2016		8,577
	2017		8,788
	2018		9,033
	2019		9,283
	Thereafter		27,963

	Total minimum lease payments	$	70,772

	Contingencies
	Zillow Merger Litigation
	Between August 7, 2014 and August 20, 2014, four plaintiffs filed purported class action lawsuits against us and our directors, Zillow and HoldCo in connection with the Zillow Merger. Three of those purported class actions were brought in the Delaware Court of Chancery, captioned Shue et al. v. Trulia, Inc., et al., Case No. 10020 (August 7, 2014), Sciabacucci et al. v. Trulia, Inc., et al., Case No. 10022 (August 8, 2014), and Steinberg et al. v. Trulia, Inc. et al., Case No. 10049 (August 20, 2014). The fourth of those purported class actions was brought in the Superior Court of the State of California for the County of San Francisco, captioned Collier et al. v. Trulia, Inc., et al., Case No. CGC 14-540985 (August 7, 2014).
	Each of the lawsuits alleges that our directors breached their fiduciary duties to Trulia stockholders, and that the other defendants aided and abetted such breaches, by seeking to sell Trulia through an allegedly unfair process and for an unfair price and on unfair terms. The Collier complaint filed in Delaware and the Sciabacucci complaint (as amended, as described below) also allege that our directors breached their fiduciary duties to Trulia stockholders, and that the other defendants aided and abetted such breaches, with respect to the contents of HoldCo’s registration statement on Form S-4. All lawsuits seek, among other things, equitable relief that would enjoin the consummation of the Zillow Merger and attorneys’ fees and costs. The Delaware actions also seek rescission of the Merger Agreement (to the extent it has already been implemented) or rescissory damages, and orders directing the individual defendants to account for alleged damages suffered by the plaintiff and the purported class as a result of the defendants’ alleged wrongdoing.
	On September 23, 2014, the plaintiff in the Sciabacucci action filed an amended complaint, alleging substantially the same claims and seeking substantially the same relief as in the original complaint, and on September 24, 2014, the plaintiff filed (1) a motion for expedited proceedings, (2) a motion for a preliminary injunction, (3) a request for production of documents from defendants, and (4) notice of depositions. On October 7, 2014, the plaintiff in the Collier action filed a new complaint in Delaware Court of Chancery, captioned Collier et al. v. Trulia, Inc., et al., Case No. 10209 (October 7, 2014), alleging substantially the same claims and seeking substantially the same relief as the original complaint filed in California. On October 8, 2014, the plaintiff in the Collier action filed a request for dismissal of the California case without prejudice. On October 13, 2014, the Delaware Court of Chancery issued an order consolidating all of the Delaware actions into one matter captioned In re Trulia, Inc. Stockholder Litigation, C.A. No. 10020-CB, and appointed a lead counsel. On October 13 and 14, 2014, the above-referenced motions were refiled under the consolidated case number.
	On November 19, 2014, the defendants entered into a memorandum of understanding with the In re Trulia, Inc. Stockholder Litigation plaintiffs regarding the settlement of that action. In connection with the settlement contemplated by the memorandum of understanding, with the defendants expressly denying that any of the claims has any merit, Trulia agreed to make certain additional disclosures related to the proposed merger, which disclosures Trulia made in a Form 8-K filed with the SEC on November 19, 2014. The memorandum of understanding contemplates that the parties will seek to enter into a stipulation of settlement.
	The stipulation of settlement will be subject to customary conditions, including court approval following notice to the Trulia stockholders. In the event that the parties enter into a stipulation of settlement, a hearing will be scheduled at which the Delaware Court of Chancery will consider the fairness, reasonableness, and adequacy of the settlement. There can be no assurance that the parties will ultimately enter into a stipulation of settlement or that the Delaware Court of Chancery will approve the settlement even if the parties were to enter into such stipulation. In such event, the proposed settlement as contemplated by the memorandum of understanding may not be consummated.
	From time to time, we are subject to legal proceedings and claims in the ordinary course of business. We have received, and may in the future continue to receive, claims from third parties asserting, among other things, infringement of their intellectual property rights.
	Although the results of litigation and claims cannot be predicted with certainty, we believe the final outcome of the matters discussed above will not have a material and adverse effect on our business, financial position, results of operations, or cash flows. We will, however, accrue for losses for any known contingent liabilities when future payment is probable and the amount is reasonably estimable.

	Indemnifications
	In the ordinary course of business, we enter into contractual arrangements under which we agree to provide indemnification of varying scope and terms to business partners and other parties with respect to certain matters, including, but not limited to, losses arising out of the breach of such agreements and out of intellectual property infringement claims made by third parties. In these circumstances, payment may be conditional on the other party making a claim pursuant to the procedures specified in the particular contract. Further, our obligations under these agreements may be limited in terms of time and/or amount, and in some instances, we may have recourse against third parties for certain payments. In addition, we have indemnification agreements with certain of its directors and executive officers that require us, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The terms of such obligations may vary. No such obligations existed as of December 31, 2014 and 2013.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2014
Equity [Abstract]
Stockholders' Equity	9. Stockholders’ Equity
	Shares Repurchases
	In December 2013, we used $30.0 million of the net proceeds received from the issuance of the 2020 Notes to repurchase 1,085,383 shares of our common stock from purchasers of the 2020 Notes in privately negotiated transactions effected through J.P. Morgan Securities LLC or its affiliate as our agent. The purchase price per share of the common stock repurchased in this transaction was equal to the closing price per share of our common stock on December 11, 2013, which was $27.64. We also repurchased nominal other amounts of shares of our common stock in the open market at their effective market prices at the time of purchase. All shares repurchases were accounted for at cost.
	Common Stock
	As of December 31, 2014 and 2013, we had reserved shares of common stock for issuance as follows:


		As of		As of
		December 31,		December 31,
		2014		2013
	Stock options and awards issued and outstanding		5,550,417		6,452,832
	Stock options and awards available for grant under 2012 Plan		2,644,920		1,976,815
	Stock options and awards available for grant under the 2004 Plan		—		82,784

	Total		8,195,337		8,512,431

	The common stock warrants were net exercised in February 2013 at an exercise price of $8.47 per share for an aggregate of 39,025 shares of common stock.
	Preferred Stock
	Under our amended and restated certificate of incorporation registered in September 2012, we were authorized to issue 20,000,000 shares of preferred stock at $0.00001 par value per share. The preferred stock may be issued from time to time in one or more series pursuant to a resolution or resolutions duly adopted by the board of directors. Our board of directors is authorized to determine by resolution the relevant powers of each issue of the preferred stock, such as designations, preferences, participation, dividend rights, divided rates, conversion rights, voting rights, etc. As of December 31, 2014 and 2013 no shares of preferred stock were issued or outstanding.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
Stock-Based Compensation	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	10. Stock-Based Compensation
	2005 Stock Plan
	We granted options under our 2005 Stock Incentive Plan (“the 2005 Plan”) until September 2012 when the 2005 Plan was terminated. Since the date of the plan termination, no more stock options or awards were issued under the plan, however the stock options issued prior to the plan termination continue to be outstanding. Under the terms of the 2005 Plan, we had the ability to grant incentive (“ISO”) and nonstatutory (“NSO”) stock options, restricted stock awards (“RSA”) and restricted stock units (“RSU”). The options were granted at a price per share not less than 100% of the fair market value per share at the grant date. Options granted under the 2005 Plan generally vest at a rate of 25% after the first year and then at 1/36 of the remaining shares each month thereafter and expire 10 years from the grant date. Certain options vest monthly over two to four years.
	2012 Equity Incentive Plan
	Effective September 19, 2012, our board of directors adopted, and our stockholders approved, a 2012 Equity Incentive Plan (“the 2012 Plan”). The 2012 Plan provides for the grant of ISOs, NSOs, restricted stock, restricted stock units, stock appreciation rights, performance units, and performance shares to our employees, directors, and consultants. Upon adoption of the 2012 Plan, a total of 2,370,000 shares of common stock were reserved for issuance plus up to 1,000,000 shares from the expiration or termination of awards under the 2005 Plan. The shares available are increased at the beginning of each fiscal year by the lesser of (i) 2,100,000 shares, (ii) 4% of outstanding common stock on the last day of the immediately preceding fiscal year, or (iii) such number determined by our board of directors. On January 1, 2015 and 2014 the shares available for grant under the 2012 Plan were automatically increased by 1,529,297 and 1,463,303 shares, respectively. On June 5, 2013, the stockholders approved a 2,000,000 share increase to the 2012 Plan. Under the 2012 Plan, both the ISOs and NSOs are granted at a price per share not less than 100% of the fair market value per share of the underlying stock at the grant date. The board of directors determines the vesting period for each option award on the grant date, and the options generally expire 10 years from the grant date or such shorter term as may be determined by the board of directors. The restricted stock units are granted for zero purchase price.
	Market Leader 2004 Equity Incentive Plan
	In connection with our acquisition of Market Leader and pursuant to the Market Leader Merger Agreement, we assumed Market Leader’s 2004 Equity Incentive Plan (“the 2004 Plan”) including all outstanding shares of restricted stock, all outstanding stock appreciation rights, all outstanding options, and all shares available for future issuance under the 2004 Plan, and all of such securities became issuable for shares of our common stock. We granted equity awards, to the extent permissible by applicable law and NYSE rules, under the 2004 Plan until it expired on December 9, 2014. The equity awards issued prior to the 2004 Plan expiration continue to be outstanding and are governed by the provisions of the 2004 Plan.
	We did not assume House Value’s 1999 Stock Incentive Plan (“the 1999 Plan”). However, pursuant to the Market Leader Merger Agreement, we have assumed all outstanding shares of restricted stock, all outstanding stock appreciation rights, and all outstanding options issued under the 1999 Plan. These equity awards continue to be outstanding and are governed by the provisions of the 1999 Plan.
	Total shares of common stock available for grant under our 2012 Plan and 2004 Plan were 2,644,920 and 2,059,599 as of December 31, 2014 and 2013, respectively. The 2004 Plan expired on December 9, 2014, consequently no shares were available under the 2004 Plan as of December 31, 2014.

	Equity Awards Activity
	The equity awards activity under the 2005 Plan, 2012 Plan, 1999 Plan, and 2004 Plan presented below includes employee and nonemployee awards.
	Stock Option Activity


			Stock				Weighted			Weighted			Aggregate
			Options				Average			Average			Intrinsic
			Outstanding				Exercise Price			Remaining			Value
										Contractual
										Life (Years)
													(In thousands)
	Balance—January 1, 2014			3,088,449			$	13.9			7.42		$	68,131
	Granted			346,084				39.02
	Canceled			(303,306	)			30.48
	Exercised			(911,538	)			12.33

	Balance—December 31, 2014			2,219,689			$	16.19			6.93		$	66,553

	Options exercisable—December 31, 2014			1,304,211			$	9.84			6.06		$	47,261

	Options vested and expected to vest—December 31, 2014			2,109,256			$	15.75			6.86		$	64,323

	The options exercisable as of December 31, 2014 included options that were exercisable prior to vesting. The weighted average grant date fair value of options granted during the years ended December 31, 2014, 2013, and 2012 was $17.36, $15.24, and $6.77, respectively.
	Aggregate intrinsic value represents the difference between the estimated fair value of the underlying common stock and the exercise price of outstanding, in-the-money options. The aggregate intrinsic value of options exercised was $30.0 million, $45.9 million, and $5.3 million for the years ended December 31, 2014, 2013, and 2012, respectively. The total estimated grant date fair value of employee options vested during the years ended December 31, 2014, 2013 and 2012 was $7.5 million, $6.4 million and $4.6 million, respectively. As of December 31, 2014, total unrecognized compensation cost related to non-vested stock options granted to employees was $10.5 million, net of estimated forfeitures of $5.7 million. These costs will be amortized on a straight-line basis over a weighted average vesting period of 2.17 years.
	Stock Appreciation Rights Activity


			Stock				Weighted			Weighted			Aggregate
			Appreciation				Average			Average			Intrinsic
			Rights				Exercise Price			Remaining			Value
			Outstanding							Contractual
										Life (Years)
													(In thousands)
	Balance—January 1, 2014			127,544			$	11.83			3.08		$	2,990
	Granted			—				—
	Canceled			(24,992	)			12.78
	Exercised			(85,893	)			11.37

	Balance—December 31, 2014			16,659			$	12.78			2.16		$	554

	Exercisable—December 31, 2014			3,077			$	11.61			2.06		$	106

	Vested and expected to vest—December 31, 2014			15,081			$	12.75			2.16		$	502


	We measure the fair value of our stock appreciation rights similar to stock options. Our stock appreciation rights typically vest on a graded basis over either a two or four year period and typically expire on the earlier of five years from the date of grant or ninety days following termination of employment.
	We did not have stock appreciation rights in the year ended December 31, 2012. The aggregate intrinsic value of the stock appreciation rights exercised during the years ended December 31, 2014 and 2013 was $3.6 million and $908,000, respectively. The total estimated grant date fair value of the stock appreciation rights vested during the years ended December 31, 2014 and 2013 was $2.0 million and $736,000, respectively. As of December 31, 2014, total unrecognized compensation cost related to non-vested stock appreciation rights granted to employees was $767,000, net of estimated forfeitures of $423,000. These costs will be amortized on a straight-line basis over a weighted average vesting period of 1.18 years.
	Restricted Stock Units Activity


			RSUs				Weighted			Weighted			Aggregate
			Outstanding				Average			Average			Intrinsic
							Grant Date			Remaining			Value
							fair Value			Contractual
							Life (Years)
													(In thousands)
Unvested—January 1, 2014			1,660,589			$	35.28			1.94		$	58,569
Granted			1,612,050				44.34
Canceled			(383,629	)			38.55
Released			(757,441	)			34.32

Unvested—December 31, 2014			2,131,569			$	41.73			2.24		$	98,247

Restricted stock units expected to vest—December 31, 2014			1,632,663			$	42.36			2.1		$	75,151

In the second half of 2014, we granted restricted stock units to certain of our employees in connection with the Zillow Merger. These awards were set to vest on the earlier of (i) immediately prior to the closing of the Merger, or (ii) 18 months. On February 17, 2015, in connection with closing of the Zillow Merger, all of these awards have vested. We recorded a $6.9 million stock-based compensation expense associated with these awards in the year ended December 31, 2014.
As of December 31, 2014, total unrecognized compensation cost related to the non-vested RSUs granted was $77.8 million, net of estimated forfeitures of $19.3 million. This cost will be amortized on a straight-line basis over a weighted average vesting period of 2.10 years.

In May and August of 2013 we granted 2,105,000 stock unit awards in relation to the Market Leader acquisition, of which 1,576,250 were performance-based awards (“PSU”), and 528,750 were time-based awards. The performance-based awards were contingent upon closing of the Market Leader acquisition referred to in Note 1 of these consolidated financial statements, achievement of certain performance metrics, including comparative market-based returns, and the employees’ continued service relationship with us. The time-based awards were contingent upon closing of the Market Leader acquisition and the employees’ continued service relationship with us. On August 20, 2013, the first contingency was resolved when we closed the acquisition of Market Leader. Hence, the time-based awards were classified as restricted stock units and included in the RSU table above. The market condition for the performance-based awards has been achieved in the fourth quarter of 2014. The performance-based awards are summarized in the table below.


		PSUs				Weighted			Weighted			Aggregate
		Outstanding				Average			Average			Intrinsic
						Grant Date			Remaining			Value
						fair Value			Contractual
									Life (Years)
												(In thousands)
Unvested—January 1, 2014			1,576,250			$	22.84			3		$	55,594
Granted			—				—
Canceled			(393,750	)			31.57
Released			—				—

Unvested—December 31, 2014			1,182,500			$	20.11			1.38		$	54,430

Restricted stock units expected to vest—December 31, 2014			1,111,464			$	20.11			1.38		$	51,161

We estimated the fair value of the performance-based awards using a Monte Carlo simulation model. Total compensation cost recorded related to performance-based awards in the years ended December 31, 2014 and 2013 was $5.4 million and $4.4 million, respectively. We had no PSUs in the year ended December 31, 2012.
As of December 31, 2014, total unrecognized compensation cost related to the unvested performance-based awards granted to employees was $13.8 million, net of estimated forfeitures of $7.7 million, respectively. This cost will be amortized on a straight-line basis over a weighted average vesting period of 1.38 years.
Determining Fair Value of Stock Based Awards
The fair value of each grant of stock option and stock appreciation right awards is determined by us using the methods and assumptions discussed below. Each of these inputs is subjective and generally requires significant judgment to determine.
Valuation Method—We estimate the fair value of our stock option and stock appreciation right awards using the Black-Scholes option-pricing model.
Expected Term—The expected term represents the period that the stock option awards are expected to be outstanding. We estimate the expected term for our awards grants based on a study of publicly traded industry peer companies and the historical data on our employee exercises and post-vesting employment termination behavior taking into account the contractual life of the award.
Expected Volatility—The expected volatility is derived from the historical stock volatilities of several comparable publicly listed peers over a period approximately equal to the expected term of the awards because we have limited information on the volatility of our common stock since we do not have significant trading history. When making the selections of the comparable industry peers to be used in the volatility calculation, we considered the size, operational and economic similarities to our principle business operations.

Fair Value of Common Stock—Prior to our IPO, the fair value of the common stock underlying the stock option awards was determined by our board of directors. Because there had been no public market for our stock, the board of directors had determined the fair value of the common stock at the time of the option grant by considering a number of objective and subjective factors including contemporaneous valuations performed by unrelated third party specialists, valuations of comparable companies, operating and financial performance, lack of liquidity of capital stock and general and industry-specific economic outlook, amongst other factors. After our IPO we have been using the listed stock price on the date of grant as its fair value.
Risk-Free Interest Rate—The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant for zero coupon U.S. Treasury notes with maturities approximately equal to the expected term of the options.
Expected Dividends—The expected dividend has been zero as we have never paid dividends and have no expectations to do so.
Forfeiture Rate—We estimate our forfeiture rates based on an analysis of our actual forfeitures and will continue to evaluate the adequacy of the forfeiture rate based on actual forfeiture experience, analysis of employee turnover behavior, and other factors. The impact from a forfeiture rate adjustment will be recognized in full in the period of adjustment, and if the actual number of future forfeitures differs from that estimated, we may be required to record adjustments to stock-based compensation expense in future periods.
Summary of Assumptions
The fair value of employee stock option awards is estimated on the date of grant using a Black-Scholes option-pricing model with the following weighted average assumptions:


		Year Ended December 31,
		2014				2013			2012
Expected term (in years)			5.3				5.5			5.5
Expected volatility			48	%			52	%		53	%
Risk-free interest rate			1.7	%			1.2	%		0.9	%
Dividend rate			0	%			0	%		0	%
The fair value of the restricted stock units equals the market value of the underlying stock on the date of grant.
The fair value of the performance-based awards was estimated using a Monte Carlo simulation model with the following weighted average assumptions:


		As of				As of
		May 29,				August 29,
		2013				2013
Stock price		$	30.31			$	41.67
Simulation period			2.93 years				2.68 years
Risk free rate			0.47	%			0.65	%
Volatility			52.6	%			52.6	%
Dividend yield			0	%			0	%
Cost of equity			12.6	%			12.3	%
Equity awards granted to non-employees
We granted 3,911, 0 and 0 stock based awards to nonemployees during the years ended December 31, 2014, 2013, and 2012, respectively. During the year ended December 31, 2014, as a result of the restructuring of our Market Leader operations, certain equity awards continued to vest as nonemployee awards. Such awards were subject to remeasurement at fair value at the end of each reporting period. The stock-based compensation expense recognized in connection with these awards was $1.6 million in the year ended December 31, 2014.
In the years ended December 31, 2013 and 2012, a total of $0 and $58,000 of stock-based compensation expense was recognized related to nonemployee options.
Compensation Paid in Stock
We recorded compensation expense for the stock-based awards granted to employees and other compensation paid in stock as follows (in thousands):


		Years Ended December 31,
		2014				2013			2012
Stock-based compensation:
Cost of revenue		$	2,812			$	644		$	32
Technology and development			9,466				5,659			930
Sales and marketing			13,425				4,880			398
General and administrative			15,770				9,266			1,210

Total stock-based compensation expense			41,473				20,449			2,570

Other compensation paid in stock:
Cost of revenue			276				74			—
Technology and development			1,205				706			—
Sales and marketing			747				783			—
General and administrative			1,232				961			—

Total stock-based compensation expense and other compensation paid in stock			44,933				22,973			2,570

Restructuring costs			82				—			—

Total compensation paid in stock		$	45,015			$	22,973		$	2,570

We capitalized stock-based compensation of $3.1 million, $685,000 and $66,000 in product development costs during the years ended December 31, 2014, 2013, and 2012, respectively.

Net_Loss_per_Share_Attributabl

Net Loss per Share Attributable to Common Stockholders	12 Months Ended
Net Loss per Share Attributable to Common Stockholders	Dec. 31, 2014
Earnings Per Share [Abstract]
Net Loss per Share Attributable to Common Stockholders	11. Net Loss per Share Attributable to Common Stockholders
	The following table sets for the computation of our basic and diluted net loss per share attributable to common stockholders during the years ended December 31, 2014, 2013 and 2012 (in thousands, except share and per share data):


		Year Ended December 31,
		2014			2013			2012
	Net loss attributable to common stockholders	$	(75,763	)	$	(17,759	)	$	(10,921	)

	Shares used in computing net loss per share attributable to common stockholders, basic and diluted		37,335,200			33,129,572			12,538,769

	Net loss per share attributable to common stockholders, basic and diluted	$	(2.03	)	$	(0.54	)	$	(0.87	)


	The following outstanding shares of common stock equivalents were excluded from the computation of the diluted net loss per share attributable to common stockholders for the periods presented because including them would have been antidilutive:


		Year Ended December 31,
		2014			2013			2012
	Stock options to purchase common stock		2,219,689			3,088,449			3,570,566
	Restricted stock units		3,314,069			3,236,839			37,760
	Stock appreciation rights		16,659			127,544			—
	Heldback shares in connection with Movity acquisition		—			30,524			30,524
	Common stock warrants		—			—			56,054
	Convertible senior notes		6,400,969			6,400,969			—

Market_Leader_Restructuring

Market Leader Restructuring	12 Months Ended
Market Leader Restructuring	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Market Leader Restructuring	12. Market Leader Restructuring
	In June 2014, as an ongoing effort to fully integrate Market Leader’s operations, we committed to a restructuring plan according to which we reduced headcount by 83 employees and incurred certain contract termination and other costs. We substantially completed these restructuring activities as of December 31, 2014.
	A summary of total restructuring activities is shown in the table below (in thousands):


		One-time			Contract			Other			Total
		Termination			Termination			Associated
		Benefits			Costs			Costs
	Restructuring costs	$	598		$	2,168		$	877		$	3,643
	Cash payments		(329	)		—			(649	)		(978	)

	Balance as of June 30, 2014		269			2,168			228			2,665

	Restructuring costs		565			614			45			1,224
	Cash payments		(591	)		(6	)		(192	)		(789	)
	Non-cash charges		(82	)		—			—			(82	)
	Change in estimate		(25	)		—			(45	)		(70	)

	Balance as of September 30, 2014		136			2,776			36			2,948
	Restructuring costs		—			—			257			257
	Cash payments		(41	)		(150	)		(90	)		(281	)
	Change in estimate		—			—			(67	)		(67	)

	Balance as of December 31, 2014	$	95		$	2,626		$	136		$	2,857

	In the year ended December 31, 2014, we incurred $5.0 million in restructuring costs, most of which were general and administrative in nature. The restructuring accruals, which totaled $2.9 million at December 31, 2014, are recorded as part of the accrued liabilities in our consolidated balance sheet. This balance reflects estimated future cash outlays.

SelfInsurance

Self-Insurance	12 Months Ended
Self-Insurance	Dec. 31, 2014
Text Block [Abstract]
Self-Insurance	13. Self-Insurance
Self-Insurance	We are self-insured for a portion of our employees’ medical and dental coverage. The medical plan carries a stop-loss policy, which will protect from individual claims during the plan year exceeding $100,000 or when cumulative medical claims exceed 125% of expected claims for the plan year. We record estimates of the total costs of claims incurred as of the balance sheet date based on an analysis of historical data and independent estimates. Our liability for self-insured medical and dental claims is included in the accrued compensation and benefits balance in our consolidated balance sheets and was $707,000 and $225,000, as of December 31, 2014 and 2013, respectively.

Income_Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	14. Income Taxes
	We account for income taxes in accordance with authoritative guidance, which requires the use of the asset and liability method. Under this method, deferred income tax assets and liabilities are determined based upon the difference between the financial statement carrying amounts and the tax basis of assets and liabilities and are measured using the enacted tax rate expected to apply to taxable income in the years in which the differences are expected to be reversed.
	As a result of the acquisition of Market Leader in August 2013, we recorded a tax benefit of $7.9 million as a discrete item in the third quarter of 2013. This tax benefit is a result of the partial release of our existing valuation allowance in conjunction with the acquisition since the acquired deferred tax liabilities from Market Leader will provide a source of income for us to realize a portion of its deferred tax assets, for which a valuation allowance is no longer needed.
	The components of the provision for income taxes for the years ended December 31, 2014, 2013 and 2012 are as follows (in thousands):


			Year Ended December 31,
			2014				2013				2012
	Current:
	State		$	427			$	412			$	67
	Deferred:
	Federal			—				(5,123	)			—
	State			—				(2,800	)			—

	TOTAL		$	427			$	(7,511	)		$	67

	A reconciliation of the statutory federal income tax rate of 35% and 34% for 2014 and 2013, respectively, to the actual tax rate for the years ended December 31 is as follows (in thousands):


			As of December 31,
			2014				2013
	Tax at federal statutory rate		$	(26,430	)		$	(8,592	)
	Permanent items			244				128
	State taxes			(844	)			(499	)
	Net operating loss not benefitted			21,110				8,004
	Acquisition related costs			6,216				1,072
	Valuation allowance release			—				(7,923	)
	Stock-based compensation			131				299

	Income tax expense		$	427			$	(7,511	)


	Deferred income taxes reflect the net tax effect of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes, and the amount used for income tax purposes. Our deferred tax assets and liabilities are detailed below (in thousands):


			As of December 31,
			2014				2013
	Assets:
	Net operating loss carryforwards		$	50,824			$	40,828
	Tax credit carryforwards			8,371				5,210
	Accruals and reserves			8,337				5,082
	Stock-based compensation			10,891				9,034
	Other			16				27

	Gross deferred tax assets			78,439				60,181
	Valuation allowance			(46,191	)			(20,995	)

	Total deferred tax assets			32,248				39,186

	Liabilities:
	Deferred Revenue			—				(58	)
	Prepaid expenses and other			(1,097	)			(1,085	)
	Fixed assets and intangibles			(31,151	)			(38,043	)

	Total deferred tax liabilities			(32,248	)			(39,186	)

	Net deferred tax assets		$	—			$	—

	Total net deferred tax assets and liabilities are included in the Company’s consolidated balance sheets as follows:


			As of December 31,
			2014				2013
	Current deferred tax assets		$	1,206			$	3,038
Non-current deferred tax assets			—				2,525
Non-current deferred tax liabilities			(1,206	)			(5,563	)

Net deferred tax liabilities		$	—			$	—

We have evaluated the available positive and negative evidence surrounding our ability to realize our deferred tax assets. In our evaluation, we determined that our recent and cumulative history of pre-tax book losses, as well as our expectation of pre-tax losses in the near future, presents overwhelming negative evidence of our ability to realize our deferred tax assets in excess of our deferred tax liabilities. Accordingly, we have established a full valuation allowance against our net deferred tax assets. Our valuation allowance was approximately $21.0 million at December 31, 2013 and was increased by approximately $25.2 million to approximately $46.2 million at December 31, 2014.
On December 19, 2014, the Tax Increase Prevention Act of 2014 was signed into law which retroactively extends most of the provisions that expired at the end of 2013 until the end of 2014. This change in tax law did not materially impact our tax provision as a result of the full valuation allowance recorded against our net deferred tax assets.
At December 31, 2014, we had approximately $192.2 million of federal net operating loss and $152.5 million of state net operating loss carryforwards available to reduce future taxable income, which will begin to expire in 2025 and 2015, respectively. Included in the above net operating loss carryforwards are $59.0 million and $45.7 million of federal and state net operating loss carryforwards, respectively, associated with a windfall tax benefit that will be recorded as additional paid in capital when realized.

During the year ended December 31, 2013, we completed an analysis of certain research expenditures attributable to the legacy Trulia business to determine whether, and to what extent, federal and state research credits could be claimed and carried forward from inception through 2013. As a result of that analysis, we claimed research and development credits of approximately $2.9 million and $2.5 million, for federal and state purposes, respectively. These credits have been presented as an increase to deferred tax assets in the table above for the year ended December 31, 2013 but have also resulted in a corresponding increase to our valuation allowance. The claim therefore had no net impact to income tax expense.
At December 31, 2014, we had approximately $6.6 million of federal research credit and $5.7 million of state research credit carryforwards. In addition, we had approximately $1.3 million of state enterprise zone credits carryforwards. The federal credits will begin to expire in 2025 and the state credits can be carried forward indefinitely.
Utilization of the net operating loss and tax credit carryforwards are subject to annual use limitations due to certain ownership change rules provided by the Internal Revenue Code of 1986, as amended, and similar state provisions. However, we do not anticipate these limitations will significantly impact our ability to utilize our net operating losses and tax credit carryforwards.
A reconciliation of our unrecognized tax benefits, excluding accrued interest and penalties, for 2014, 2013 and 2012 is as follows (in thousands):


		As of December 31,
		2014				2013				2012
Balance at the beginning of the year		$	2,336			$	20			$	475
Increases (decreases) related to prior year tax positions			1,253				—				(475	)
Current year increases			3,113				2,316				20

Balance at the end of the year		$	6,702			$	2,336			$	20

We recognize interest and penalties related to income tax matters as a component of income tax expense. As of December 31, 2014, there were no accrued interest and penalties related to uncertain tax positions. We do not have any tax positions that are expected to significantly increase or decrease within the next 12 months.
We file income tax returns in the U.S. federal and various state jurisdictions. Our tax years for 2011 and forward are subject to examination by the U.S. tax authorities, our tax years for 2010 and forward are subject to examination by various state tax authorities. However, due to the fact that we had net operating losses and credits carried forward in most jurisdictions, certain items attributable to technically closed years are still subject to adjustment by the relevant taxing authority through an adjustment to tax attributes carried forward to open years. In addition, to the extent we are deemed to have a sufficient connection to a particular taxing jurisdiction to enable that jurisdiction to tax us but we have not filed an income tax return in that jurisdiction for the year(s) at issue, the jurisdiction would typically be able to assert a tax liability for such years without limitation on the number of years it may examine.

Employee_Benefit_Plan

Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2014
Postemployment Benefits [Abstract]
Employee Benefit Plan	15. Employee Benefit Plan
	Effective April 1, 2014, we have a single defined contribution 401(k) retirement plan covering Trulia and Market Leader employees who have met certain eligibility requirements (“the Trulia 401(k) Plan”). Eligible employees may contribute pretax compensation up to a maximum amount allowable under the Internal Revenue Service limitations. Employee contributions and earnings thereon vest immediately.

	We currently match up to 4% of employee contributions under the Trulia 401(k) Plan. Our expense related to the Trulia 401(k) Plan was $2.9 million and $1.1 million for the years ended December 31, 2014 and 2013, respectively.

Subsequent_Events

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	16. Subsequent Events
	Zillow Merger
	As previously announced, Trulia, Zillow and HoldCo entered into the Merger Agreement on July 28, 2014. Pursuant to the terms of the Merger Agreement, on February 17, 2015, (i) a wholly owned subsidiary of HoldCo (“Zillow Merger Sub”) was merged with and into Zillow, the separate corporate existence of Zillow Merger Sub thereupon ceased and Zillow continued as the surviving corporation (the “Zillow Merger”) and (ii) a separate wholly owned subsidiary of HoldCo (“Trulia Merger Sub”) merged with and into Trulia, the separate corporate existence of Trulia Merger Sub thereupon ceased and Trulia continued as the surviving corporation (the “Trulia Merger” and, together with the Zillow Merger, the “Mergers”). As a result of the Mergers, both Trulia and Zillow are now wholly owned subsidiaries of HoldCo.
	Pursuant to the terms of the Merger Agreement, upon completion of the Mergers, (a) each share of Trulia Common Stock issued and outstanding immediately prior to the Trulia Merger (other than shares owned by Trulia as treasury stock and shares owned by Zillow or HoldCo or any direct or indirect wholly owned subsidiary of Zillow or Trulia) converted into the right to receive 0.444 of a share of fully paid and nonassessable HoldCo Class A Common Stock, (b) each share of Class A common stock, par value $0.0001 per share, of Zillow (the “Zillow Class A Common Stock”) issued and outstanding immediately prior to the Zillow Merger (other than shares owned by Zillow as treasury stock, shares owned by Trulia or HoldCo, or any direct or indirect wholly owned subsidiary of Zillow or Trulia) converted into the right to receive one fully paid and nonassessable share of HoldCo Class A Common Stock; and (c) each share of Class B common stock, par value $0.0001 per share, of Zillow (the “Zillow Class B Common Stock”) issued and outstanding immediately prior to the Zillow Merger (other than shares owned by Zillow as treasury stock, shares owned by Trulia or HoldCo, or any direct or indirect wholly owned subsidiary of Zillow or Trulia) converted into the right to receive one fully paid and nonassessable share of Class B common stock, par value $0.0001 per share, of HoldCo (the “HoldCo Class B Common Stock”). The HoldCo Class A Common Stock has one vote per share, and the HoldCo Class B Common Stock has ten votes per share, similar to the former capital structure of Zillow. As a result of the Mergers, Zillow’s founders, Richard Barton and Lloyd Frink, became the beneficial owners of more than a majority of the outstanding voting power of the shares of HoldCo Class A Common Stock and HoldCo Class B Common Stock.
	In connection with the closing of the Mergers, we notified the New York Stock Exchange, or NYSE, that the Mergers had been completed, and requested that trading of our common stock on the NYSE be suspended after close of market on February 17, 2015 and that our common stock be delisted on the New York Stock Exchange and with the Securities and Exchange Commission. In addition, after we file this Annual Report on Form 10-K, we will request that the Securities and Exchange Commission terminate our reporting obligations under Sections 13 and 15(d) of the Exchange Act.
	Pursuant to the terms of the Merger Agreement, all of the members of our Board of Directors, other than Peter Flint, Gregory Waldorf, and Erik Bardman, resigned as of the Merger effective time, including Theresia Gouw, Daniel Stephen Hafner, Sami Inkinen and Robert Moles. Messrs. Flint, Waldorf and Bardman are expected to resign immediately following the filing of this Annual Report on Form 10-K. In addition, the following executive officers of Trulia resigned their offices as of the Merger effective time: Daniele Farnedi, Chief Technology Officer and Scott Darling, Vice President, General Counsel and Corporate Secretary. Messrs. Aggarwal and Flint are expected to resign their offices as executive officers immediately following the filing of this Annual Report on Form 10-K.
	Further, on February 17, 2015, in connection with the Mergers, we undertook a restructuring plan that will result in a total workforce reduction of approximately 342 employees, or approximately 32% of our workforce, at our Bellevue, Denver, New York and San Francisco locations, primarily in the sales and marketing functions. The restructuring plan is a result of the integration of our business and operations with and into Zillow’s business. Employees directly affected by the restructuring plan will be provided with severance payments, vesting acceleration, and outplacement assistance. We expect to complete the restructuring by the end of 2015.
	As a result of the restructuring plan, we plan to record a one-time restructuring charge of between approximately $21.5 million and $24.5 million in 2015, primarily representing cash payments for severance and other personnel related expenses, and non-cash expenses related to stock vesting acceleration. Severance payments will be paid out by the end of 2015. The restructuring charge that we expect to incur in connection with the restructuring is subject to a number of assumptions, and actual results may materially differ. We may also incur other material charges not currently contemplated due to events that may occur as a result of, or associated with, the restructuring plan.
	In addition, in connection with the closing of the Zillow Merger on February 17, 2015, the 2020 Notes were assumed by HoldCo and each outstanding 2020 Note which was convertible into shares of our common stock is now convertible into shares of HoldCo Class A Common Stock.
	ListHub Litigation
	On February 19, 2015, Move Sales Inc., the parent company of our largest for-sale listings data provider, ListHub, notified us that it plans to terminate our existing Platform Services Agreement on February 26, 2015 due to our acquisition by Zillow. On February 20, 2015, we filed a complaint and an application for a temporary restraining order in the Superior Court of the State of California, County of San Francisco against ListHub. The complaint and the application allege, among other things, breach of contract by ListHub in seeking to terminate the Agreement and seek injunctive relief to prevent termination of the Agreement and termination of the listings feeds ListHub provides to Trulia. On February 23, 2015, the Superior Court granted our application for a temporary restraining order and set March 12, 2015 as the date for a hearing on a preliminary injunction on the matter.

Valuation_and_Qualifying_Accou

Valuation and Qualifying Accounts	12 Months Ended
Valuation and Qualifying Accounts	Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts	SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS


		Year Ended
		December 31,
		2014			2013			2012
		(In thousands)
	Allowance for Doubtful Accounts:
	Beginning balance	$	411		$	142		$	80
	Charged to costs and expenses		(135	)		351			95
	Reductions and write-offs		(190	)		(82	)		(33	)

	Ending balance	$	86		$	411		$	142

	All other schedules have been omitted because they are not required, not applicable, or the required information is otherwise included.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
	Our consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“US GAAP”).
Principles of Consolidation	Principles of Consolidation
	The consolidated financial statements include the operations of Trulia and our wholly owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates
	The preparation of the accompanying financial statements in conformity with US GAAP requires that we make estimates and assumptions about future events that affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. Significant items subject to such estimates include: revenue recognition; useful lives of property and equipment and intangible assets; recoverability of long-lived assets and intangible assets with definite lives; income tax uncertainties, including a valuation allowance for deferred tax assets; accounting for business combinations; restructuring reserves; and contingencies. We base these estimates on historical and anticipated results, trends, and various other assumptions that we believe are reasonable under the circumstances, including assumptions as to future events. These estimates form the basis for making judgments about the carrying values of assets and liabilities and recorded revenue and expenses that are not readily apparent from other sources. Actual results could differ from those estimates.
Concentrations of Credit Risk and Credit Evaluations	Concentrations of Credit Risk and Credit Evaluations
	Financial instruments which potentially subject us to concentrations of credit risk consist principally of cash and cash equivalents, and trade accounts receivable. We deposit our cash and cash equivalents with major financial institutions that management believes are of high credit quality; however, at times, balances exceed federally insured limits.
	Our accounts receivable are derived from customers in the United States of America and Canada. We do not require our customers to provide collateral to support accounts receivable. We perform ongoing credit evaluations of our customers’ financial condition and maintain allowances for estimated credit losses. Actual credit losses may differ from our estimates. No customer represented 10% or more of total revenue during the years ended December 31, 2014, 2013 and 2012. No customer represented 10% or more of our gross accounts receivable as of December 31, 2014, and one customer accounted for 13.0% of the gross accounts receivable as of December 31, 2013.
Revenue Recognition	Revenue Recognition
	We recognize revenue when persuasive evidence of an arrangement exists, delivery has occurred, the price to the buyer is fixed or determinable, and collection is reasonably assured. We consider a signed agreement, a binding insertion order, or other similar documentation reflecting the terms and conditions under which products will be provided to be persuasive evidence of an arrangement. Collectability is assessed based on a number of factors, including payment history and the creditworthiness of a customer. If it is determined that collection is not reasonably assured, revenue is not recognized until collection becomes reasonably assured, which is generally upon receipt of cash.
	Our revenue is comprised of Marketplace revenue and Media revenue.

	Marketplace Revenue. Marketplace revenue primarily consists of products and services sold to real estate professionals, including agents, brokers, agents of property managers, builders, and mortgage lenders on a fixed fee subscription, Cost Per Click (“CPC”) or Cost Per Lead (“CPL”) basis. We currently sell four sets of products to real estate professionals on a subscription basis. The first set of products, which includes Trulia Local Ads and Trulia Mobile Ads, enables real estate professionals to promote themselves on our search results pages and property details pages for a local market area. Real estate professionals purchase subscriptions to these products based upon their specified market share for a city or zip code, at a fixed monthly price, for periods ranging from one month to one year, with pricing depending on demand, location, and the percentage of market share purchased. Our second set of products allows real estate professionals to receive prominent placement of their listings in our search results. Real estate professionals sign up for new subscriptions to this product at a fixed monthly price for periods that generally range from six months to 12 months. Our third set of products includes Trulia Seller Ads that enable real estate professionals to generate leads from consumers interested in selling their homes. Our fourth set of products is our comprehensive premium software-as-a-service based marketing products typically sold to real estate professionals as a bundle of products under a fixed fee subscription. We also sell a base version of these products to strategic franchise networks for specified contractual amounts over a number of years and partner with them to drive adoption of our premium solution across their network.
	Media Revenue. Media revenue primarily consists of display advertising sold on a Cost per Thousand (“CPM”), CPC, or CPL basis to advertisers promoting their brand on trulia.com, our mobile website, m.trulia.com, and our partners websites (cumulatively “Trulia Websites”). Impressions are the number of times an advertisement is loaded on a web page and clicks are the number of times users click on an advertisement. Revenue is recognized in the periods the clicks or impressions are delivered. Pricing is primarily based on advertisement size and position on the Trulia Websites and fees are generally billed monthly. As our mobile web pages and mobile applications offer less space on which to display advertising, a shift in user traffic from our websites to mobile products could decrease our advertising inventory and negatively affect our Media revenue. Recently, we have experienced a shift in user traffic as our mobile monthly unique visitors have continued to grow at a rapid pace and our monthly unique visitors have stayed relatively constant.
Multiple-Element Arrangements	Multiple-Element Arrangements
	We enter into arrangements with customers that include combinations of CPC media placements, CPM media placements, and subscription products.
	We allocate arrangement consideration in multiple-element revenue arrangements at the inception of an arrangement to all deliverables or those packages in which all components of the package are delivered at the same time, based on the relative selling price method in accordance with the selling price hierarchy, which includes: (i) vendor-specific objective evidence (“VSOE”), if available; (ii) third-party evidence (“TPE”), if VSOE is not available; and (iii) best estimate of selling price (“BESP”), if neither VSOE nor TPE is available.
	VSOE- We determine VSOE based on our historical pricing and discounting practices for the specific product when sold separately. In determining VSOE, we require that a substantial majority of the standalone selling prices for these products fall within a reasonably narrow pricing range. For certain subscription products, we have been able to establish VSOE.
	TPE- When VSOE cannot be established for deliverables in multiple-element arrangements, we apply judgment with respect to whether it can establish a selling price based on TPE. TPE is determined based on competitor prices for similar deliverables when sold separately. Generally, our go-to-market strategy differs from that of our peers and our offerings contain a significant level of differentiation such that the comparable pricing of the products cannot be obtained. Furthermore, we are unable to reliably determine what similar competitor selling prices are on a standalone basis. As a result, we have not been able to establish selling price based on TPE.
	BESP- When we are unable to establish selling price using VSOE or TPE, we use BESP in our allocation of arrangement consideration. The objective of BESP is to determine the price at which we would transact a sale if the service was sold regularly on a standalone basis. As we have not been able to establish VSOE or TPE for CPM media placements, CPC media placements, and certain subscription products, we determine BESP for these deliverables based on the following:

		•		The list price represents a component of the go-to-market strategy established by senior management. Our list prices are based on the features of the products offered. These features, which consist of the size and placement of the advertisements on our website, impact the list prices which vary depending on the specifications of the features. In addition, the list prices are impacted by market conditions, including the conditions of the real estate market and economy in general, and our competitive landscape; and

		•		Analysis of our selling prices for these deliverables.
	We limit the amount of allocable arrangement consideration to amounts that are fixed or determinable and that are not contingent on future performance or future deliverables. We regularly review BESP. Changes in assumptions or judgments or changes to the elements in the arrangement could cause a material increase or decrease in the amount of revenue that we report in a particular period.
	We recognize the relative fair value of the products as they are delivered assuming all other revenue recognition criteria are met.
Cost of Revenue	Cost of Revenue
	Cost of revenue consists primarily of expenses related to operating our websites and mobile applications, including those associated with the operation of our data centers and customer websites, hosting fees, customer service related headcount expenses including salaries, bonuses, benefits and stock-based compensation expense, cost to generate leads for customers, licensed content, multiple listing services fees, revenue sharing costs, credit card processing fees, third-party contractor fees, and allocated overhead.
Technology and Development	Technology and Development
	Costs to research and develop our products are expensed as incurred. These costs consist primarily of technology and development headcount related expenses including salaries, bonuses, benefits and stock-based compensation expense, third party contractor fees and allocated overhead primarily associated with developing new technologies. Technology and development also includes amortization of capitalized costs (“product development costs”) associated with the development of our marketplace.
Product Development Costs	Product Development Costs
	Product development costs include costs related to the development of our marketplace which is inclusive of costs related to the development of our delivery points, the website and mobile applications. Product development costs are accounted for as follows: all costs incurred in the preliminary project and post-implementation stages are expensed as incurred, while certain costs incurred in the application development stage of a new product or projects to provide significant additional functionality to existing products are capitalized, if certain criteria are met. Maintenance and enhancement costs are typically expensed as incurred. We capitalized costs associated with product development of $19.1 million, $8.2 million and $2.5 million during the years ended December 31, 2014, 2013 and 2012, respectively, and recorded related amortization expense of $6.4 million, $2.7 million and $1.1 million during the years ended December 31, 2014, 2013 and 2012, respectively. The net book value of capitalized product development costs was $11.5 million and $7.5 million as of December 31, 2014 and 2013, respectively. Such costs are amortized on a straight-line basis over the estimated useful lives of the related assets, which have been estimated to be two years. Amortization expense is included in technology and development in the statements of operations.
Advertising Expense	Advertising Expense
	Advertising costs are expensed when incurred and are included in sales and marketing expenses. Barter transactions represent the exchange of online advertising through placement of links. No revenue or expense for such barter transactions is recognized because the fair value of neither the advertising surrendered nor the advertising received is determinable.
	Our advertising expense was $33.8 million, $7.7 million and $2.6 million during the years ended December 31, 2014, 2013, and 2012, respectively.
Stock-Based Compensation	Stock-Based Compensation
	We recognize compensation costs related to stock options and restricted stock units granted to employees based on the estimated fair value of the awards on the date of grant, net of estimated forfeitures. We measure the grant date fair value of stock options and stock appreciation rights using the Black-Scholes option-pricing model. Grant date fair value of restricted stock units equals the fair value of our common stock on the date of grant. These fair values are recognized on a straight-line basis over the requisite service period, which is the vesting period of the respective awards.
	We account for equity awards issued to nonemployees based on the fair value of these awards, similar to employee awards. This fair value is remeasured at the end of each reporting period and the resulting change in value, if any, is recognized in the statement of operations as cumulative compensation cost during the period the related services are rendered.
Income Taxes	Income Taxes
	We account for income taxes in accordance with the asset and liability method. Under this method, deferred tax assets and liabilities are measured based on differences between the financial reporting and the tax bases of assets and liabilities using enacted tax rates that are expected to be in effect when the differences are expected to reverse. A valuation allowance is established to reduce net deferred tax assets to amounts that are more likely than not to be realized.
	We account for uncertainty in tax positions recognized in the financial statements by recognizing a tax benefit from an uncertain tax position when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, based on the technical merits. Income tax positions must meet a more-likely-than-not recognition threshold at the effective date to be recognized.
	Our policy for classifying interest and penalties associated with unrecognized income tax benefits is to include such items as tax expense.
Restructuring Costs	Restructuring Costs
	The main components of our restructuring plan relate to workforce reduction and contract termination costs. Workforce reduction charges are accrued when it is probable that the employees are entitled to the severance payments and the amounts can be reasonably estimated. One-time involuntary termination benefits are accrued when the plan of termination has been communicated to the employees and certain other criteria are met. Contract termination costs are recognized as a liability when a contract is terminated in accordance with its terms, or at the cease-use date. If the amounts and timing of cash flows from restructuring activities are significantly different from what we have estimated, the actual amount of restructuring and other related charges could be materially different than those we have recorded. Further details on the restructuring are presented in Note 12 of these audited consolidated financial statements.
Comprehensive Loss	Comprehensive Loss
	During the years ended December 31, 2014, 2013 and 2012, we did not have any other comprehensive income and, therefore, the net loss and comprehensive loss were the same for all periods presented.
Net Loss per Share Attributable to Common Stockholders	Net Loss per Share Attributable to Common Stockholders
	We calculate the basic and diluted net loss per share attributable to common stockholders in conformity with the two-class method required for companies with participating securities. Immediately prior to the completion of our IPO in September 2012, all shares of outstanding preferred stock automatically converted into 14,161,444 shares of common stock. In addition, our outstanding preferred stock warrants converted into 56,054 common stock warrants. Under the two-class method, in periods when we have net income, net income attributable to common stockholders is determined by allocating undistributed earnings, calculated as net income less current period convertible preferred stock non-cumulative dividends, between common stock and the convertible preferred stock. In computing diluted net income attributable to common stockholders, undistributed earnings are re-allocated to reflect the potential impact of dilutive securities. Our basic net loss per share attributable to common stockholders is calculated by dividing the net loss attributable to common stockholders by the weighted average number of shares of common stock outstanding for the period. The diluted net loss per share attributable to common stockholders is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, options to purchase common stock, and common stock warrants are considered common stock equivalents but have been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect is antidilutive.
Cash and Cash Equivalents	Cash and Cash Equivalents
	Cash and cash equivalents include cash and highly liquid investments with original maturities of three months or less at the time of acquisition. Our cash equivalents consist of money market funds. All credit card and debit card transactions that process as of the last day of the fiscal year and settle within a few days in the subsequent period are also classified as cash and cash equivalents. The amounts due from the third party merchant processors for these transactions classified as cash totaled $469,000 and $349,000 as of December 31, 2014 and 2013, respectively.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts
	We perform ongoing credit evaluations of our customers. Accounts receivable are recorded at invoiced amounts, net of our estimated allowances for doubtful accounts. The allowance for doubtful accounts is estimated based on an assessment of our ability to collect on customer accounts receivable. We regularly review the allowance by considering certain factors such as historical experience, industry data, credit quality, age of accounts receivable balances and current economic conditions that may affect a customer’s ability to pay. In cases where we are aware of circumstances that may impair a specific customer’s ability to meet their financial obligations, we record a specific allowance against amounts due from the customer and thereby reduce the net recognized receivable to the amount we reasonably believe will be collected. We write-off accounts receivable against the allowance when we determine the balance is uncollectible and no longer actively pursue collection of the receivable. We recorded a provision for uncollectible accounts receivable of $(135,000), $351,000 and $95,000 during the years ended December 31, 2014, 2013, and 2012, respectively.
Restricted Cash	Restricted Cash
	Restricted cash consists of certificates of deposit held as collateral at a financial institution related to property leases in our name, and to insure the corporate credit card spending. These certificates of deposit have contractual maturities of less than three years. The balance of the restricted cash was $6.7 million and $1.6 million as of December 31, 2014 and 2013, respectively.
Property and Equipment	Property and Equipment
	Property and equipment is initially recorded at cost and depreciated using a straight-line method over the estimated useful lives of the assets. Maintenance and repair costs are charged to expense as incurred. The useful lives of our property and equipment are as follows:


	Computer equipment		2 to 3 years
	Office equipment, furniture and fixtures		3 years
	Capitalized product development costs		2 to 3 years
	Network equipment		5 years
	Leasehold improvements		Shorter of the lease term or 5 years
	Depreciation expense of assets acquired through capital leases is included within respective functional expenses in the statements of operations.
Business Combination	Business Combination
	We recognize identifiable assets acquired and liabilities assumed at their acquisition date fair values. Goodwill is measured as the excess of the consideration transferred over the net fair value of assets acquired and liabilities assumed on the acquisition date. While we use our best estimates and assumptions as part of the purchase price allocation process to accurately value assets acquired and liabilities assumed, our estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, we may record adjustments to the assets acquired and liabilities assumed, with the corresponding offset to goodwill to the extent that we identify adjustments to the preliminary purchase price allocation. Upon conclusion of the measurement period or final determination of the values of the assets acquired and liabilities assumed, whichever comes first, any subsequent adjustments are recorded to our consolidated statements of operations.
Purchased Intangible Assets	Purchased Intangible Assets
	Purchased intangible assets with a determinable economic life are carried at cost, less accumulated amortization. Amortization is computed over the estimated useful life of each asset on a straight-line basis. The useful lives of the purchased intangible assets are as follows:


	Enterprise relationships			10 years
	Premium users			5 years
	Existing technology			7 years
	Trade names			10 years
	Home/MLS data feeds			10 years
	Purchased intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of assets to be held and used is measured first by a comparison of the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset. If such assets are considered to be impaired, an impairment loss would be recognized when the carrying amount of the asset exceeds the fair value of the asset.
Goodwill	Goodwill
	Goodwill represents the excess of the aggregate purchase price paid over the fair value of the net identifiable assets acquired. Goodwill is not amortized and is tested for impairment at least annually or whenever events or changes in circumstances indicate that the carrying value may not be recoverable. We have determined that we operate as one reporting unit and have selected December 1 as the date to perform our annual impairment test. In the valuation of our goodwill, we must make assumptions regarding estimated future cash flows to be derived from our business. If these estimates or their related assumptions change in the future, we may be required to record impairment for these assets. The first step of the impairment test involves comparing the fair value of the reporting unit to its net book value, including goodwill. If the net book value exceeds its fair value, then we would perform the second step of the goodwill impairment test to determine the amount of the impairment loss. The impairment loss would be calculated by comparing the implied fair value of the entity to its net book value. In calculating the implied fair value of our goodwill, the fair value of the entity would be allocated to all of the other assets and liabilities based on their fair values. The excess of the fair value of the entity over the amount assigned to the other assets and liabilities is the implied fair value of goodwill. An impairment loss would be recognized when the carrying amount of goodwill exceeds its implied fair value. We had no impairment of goodwill in the years ended December 31, 2014, 2013, or 2012.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets
	Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of assets to be held and used is measured first by a comparison of the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset. If such assets are considered to be impaired, an impairment loss would be recognized when the carrying amount of the asset exceeds the fair value of the asset. To date, we believe that no such impairment has occurred.
Deferred Revenue	Deferred Revenue
	Deferred revenue consists of prepaid but unrecognized subscription revenue, advertising fees received or billed in advance of delivery and for amounts received in instances when revenue recognition criteria have not been met. Deferred revenue is recognized when all revenue recognition criteria have been met.
Segment Information	Segment Information
	We have one reportable segment. Our reportable segment has been identified based on how our chief operating decision maker manages our business, makes operating decisions and evaluates operating performance. The chief executive officer acts as the chief operating decision maker and reviews financial and operational information on an entity-wide basis.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements
	In November 2014, the Financial Accounting Standards Board, or FASB, issued the Accounting Standards Update No. 2014-17, “Business Combinations (Topic 805),” (“ASU 2014-17”). ASU 2014-17 provides an acquired entity an option to apply pushdown accounting in its separate financial statements when a change in control occurs. The acquired entity may make this election in the subsequent period, which will constitute a change in accounting principle. If pushdown accounting option is elected for a specific change in control event, that election is irrevocable. We adopted this guidance prospectively from its effective date of November 18, 2014. Adoption of this guidance has no impact on our financial position, results of operations or cash flows in the current or future periods.
	In May 2014, the FASB issued the Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers,” (“ASU 2014-09”). ASU 2014-09 requires entities to recognize revenue for promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange. Additionally, entities should have sufficient disclosures about nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. This guidance is effective for interim and annual reporting periods beginning after December 15, 2016. Early adoption is not permitted. We expect to adopt this guidance on January 1, 2017. We are in the process of assessing the impact on our financial position, results of operations and cash flows from the adoption of this guidance.

	In July 2013, the FASB issued Accounting Standards Update No. 2013-11, “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or Tax Credit Carryforward Exists,” (“ASU 2013-11”). ASU 2013-11 requires entities to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward when settlement in this manner is available under the tax law. This guidance is effective for interim and annual reporting periods beginning after December 15, 2013, with earlier adoption permitted, and may be applied prospectively or retrospectively. We adopted this guidance on January 1, 2014. Adoption of this guidance has no impact on our financial position, results of operations or cash flows in the current or future periods.
	In February 2013, the FASB issued Accounting Standards Update No. 2013-02, “Comprehensive Income,” (“ASU 2013-02”). ASU 2013-02 requires entities to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income, if the amount being reclassified is required under US GAAP to be reclassified in its entirety to net income. For other amounts that are not required under US GAAP to be reclassified in their entirety from accumulated other comprehensive income to net income in the same reporting period, an entity is required to cross-reference other disclosures required under US GAAP that provide additional detail about those amounts. This pronouncement is effective for fiscal years beginning after December 15, 2012. We adopted this guidance on January 1, 2013 prospectively. In the years ended December 31, 2014, 2013 and 2012, we did not have any other comprehensive income and, therefore, the net loss and comprehensive loss was the same for all periods presented.
Fair Value Measurements	Fair Value Measurements
	Fair value is defined as the exchange price that would be received for an asset or an exit price paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The current accounting guidance for fair value measurements defines a three-level valuation hierarchy for disclosures as follows:
	Level I—Unadjusted quoted prices in active markets for identical assets or liabilities;
	Level II—Inputs, other than quoted prices included within Level I, that are observable, unadjusted quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data; and
	Level III—Unobservable inputs that are supported by little or no market activity, which requires us to develop our own assumptions.
	The categorization of a financial instrument within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement.
	The carrying values of our financial instruments, including cash equivalents, accounts receivable, accounts payable, and restricted cash, approximate their fair values. The estimated fair value and carrying value of our 2020 Notes were $343.6 million and $230.0 million, respectively, as of December 31, 2014, and $252.0 million and $230.0 million, respectively, as of December 31, 2013. We determined the estimated fair value of the 2020 Notes through use of binomial option pricing model. The fair value is classified as Level III due to the use of significant unobservable inputs such as estimated long-term volatility of our common stock and credit risk premium.

	During the year ended December 31, 2012, we recognized a charge to earnings of $369,000 from remeasurement of the fair value of warrants to purchase preferred stock when they were converted into warrants to purchase common stock on the day of our IPO.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
Summary of Significant Accounting Policies (Tables)	Dec. 31, 2014
Accounting Policies [Abstract]
Schedule of Useful Lives of Property and Equipment	The useful lives of our property and equipment are as follows:


	Computer equipment	2 to 3 years
	Office equipment, furniture and fixtures	3 years
	Capitalized product development costs	2 to 3 years
	Network equipment	5 years
	Leasehold improvements	Shorter of the lease term or 5 years
Schedule of Useful Lives of Purchased Intangible Assets	The useful lives of the purchased intangible assets are as follows:


	Enterprise relationships		10 years
	Premium users		5 years
	Existing technology		7 years
	Trade names		10 years
	Home/MLS data feeds		10 years

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
Fair Value Measurements (Tables)	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Summary of Fair Value Assumptions	We determined the fair value of the 2020 Notes using the following assumptions:


		As of December 31, 2014
	Stock price	$46.03
	Time to maturity	5.96 years
	Volatility	51%
	Risk free rate	1.80%
	Discount spread	8.5% - 10.5%
Schedule of Fair Value of Financial Assets Remeasured on Recurring Basis	Fair Value Measurements on a Recurrent Basis (in thousands):


		As of December 31, 2014
		Level I		Level II		Level III		Total
	Financial Assets:
	Money market funds	$	6,683	$	—	$	—	$	6,683
	Restricted cash		6,717		—		—		6,717

	Total financial assets	$	13,400	$	—	$	—	$	13,400


		As of December 31, 2013
		Level I		Level II		Level III		Total
	Financial Assets:
	Money market funds	$	6,683	$	—	$	—	$	6,683
	Restricted cash		1,589		—		—		1,589

	Total financial assets	$	8,272	$	—	$	—	$	8,272

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	12 Months Ended
Balance Sheet Components (Tables)	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Property and Equipment	Property and equipment consists of the following (in thousands):


		As of December 31,
		2014			2013
	Computer equipment	$	8,534		$	7,275
	Capitalized product development costs		21,822			9,934
	Furniture and fixtures		5,323			3,276
	Leasehold improvements		22,209			8,985
	Software		1,908			183
	Assets not yet in service		10,879			3,868

	Total property and equipment		70,675			33,521
	Less: accumulated depreciation and amortization		(20,920	)		(11,232	)

	Total property and equipment, net	$	49,755		$	22,289

Accrued Liabilities	Accrued liabilities consist of the following (in thousands):


		As of December 31,
		2014			2013
	Legal and professional fees	$	1,344		$	2,253
	Marketing and advertising expenses		2,494			1,326
	Interest		316			246
	Sales taxes		3,190			2,355
	Payroll taxes		426			651
	Acquisition of property and equipment		1,216			3,084
	Restructuring costs		2,857			—
	Other		2,040			1,346

	Total accrued liabilities	$	13,883		$	11,261

Accrued Compensation and Benefits	Accrued compensation and benefits consist of the following (in thousands):


		As of December 31,
		2014			2013
	Bonus	$	3,579		$	3,645
	Payroll and related expenses		3,121			3,191
	Commissions		2,160			2,166
	Vacation		1,727			1,861

	Total accrued compensation and benefits	$	10,587		$	10,863

Acquisition_of_Market_Leader_T

Acquisition of Market Leader (Tables)	12 Months Ended
Acquisition of Market Leader (Tables)	Dec. 31, 2014
Business Combinations [Abstract]
Summary of Purchase Price Components	The purchase price components are summarized in the following table (in thousands):


	Cash paid for the outstanding stock of Market Leader	$	170,497
	Fair value of common stock transferred as consideration for the outstanding stock of Market Leader (4,412,489 shares)		189,296
	Fair value of vested equity awards assumed by us		12,871

	Total purchase price	$	372,664

Schedule of Purchase Consideration Allocated to Assets Acquired and Liabilities Assumed	Our purchase price allocation is as follows (in thousands):


	Cash	$	9,662
	Short-term investments		2,999
	Other identifiable tangible assets		3,732

	Total tangible assets		16,393

	Accounts payable		(7,058	)
	Accrued expenses and other current liabilities		(3,104	)
	Accrued compensation and benefits		(2,253	)
	Other identifiable liabilities		(8,163	)

	Total liabilities		(20,578	)

	Net acquired tangible assets		(4,185	)

	Identifiable intangible assets		123,100
	Goodwill		253,749

	Total purchase price allocation	$	372,664

Components of Intangible Assets Acquired	Intangible assets acquired consist of the following (in thousands):


					Estimated
					Amortization
					Period
					(in years)
	Enterprise relationships	$	29,000			10
	Premium users		15,200			5
	Existing technology		32,300			7
	Trade names		42,900			10
	Home/MLS data feeds		3,700			10

	Total intangible assets acquired	$	123,100

Summary of Unaudited Pro Forma Condensed Combined Financial Information	The following table presents the unaudited pro forma condensed combined financial information (in thousands, except per share amounts). Market Leader’s portion of the revenue and net loss in the period from the acquisition and through December 31, 2013 were $21.2 million and $9.3 million, respectively.


		Years Ended December 31,
		2013			2012
	Revenue	$	178,151		$	113.073
	Net loss attributable to common shareholders	$	(33,056	)	$	(49,461	)
	Net loss per share attributable to common shareholders—basic and diluted	$	(0.92	)	$	(2.92	)

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
Goodwill and Intangible Assets (Tables)	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Goodwill balance as of December 31, 2014 and 2013 was as follows:


	Balance as of December 31, 2012	$	2,155
	Goodwill recorded in connection with the acquisition of Market Leader		253,749

	Balance as of December 31, 2013		255,904
	Change in goodwill		—

	Balance as of December 31, 2014	$	255,904

Schedule of Intangible Assets Subject to Amortization	The following table presents the detail of intangible assets subject to amortization (in thousands):


		Year Ended December 31, 2014
		Cost		Accumulated			Net
		Cost		Amortization			Net
	Enterprise relationships	$	29,000	$	(3,952	)	$	25,048
	Premium users		15,200		(4,143	)		11,057
	Existing technology		32,300		(6,289	)		26,011
	Trade names		42,900		(5,847	)		37,053
	Home/MLS data feeds		3,700		(504	)		3,196
	Other		891		(689	)		202

	Total	$	123,991	$	(21,424	)	$	102,567



		Year Ended December 31, 2013
		Cost		Accumulated			Net
		Cost		Amortization			Net
	Enterprise relationships	$	29,000	$	(1,052	)	$	27,948
	Premium users		15,200		(1,103	)		14,097
	Existing technology		32,300		(1,675	)		30,625
	Trade names		42,900		(1,557	)		41,343
	Home/MLS data feeds		3,700		(134	)		3,566
	Other		701		(392	)		309

	Total	$	123,801	$	(5,913	)	$	117,888

Schedule of Future Amortization Expense	Future amortization expense is expected to be as follows over each of the next five years (in thousands):


		Total
	2015	$	15,311
	2016		15,230
	2017		15,230
	2018		14,127
	2019		12,190
	Thereafter		30,479

	Total	$	102,567

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
Commitments and Contingencies (Tables)	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Minimum Payments under Noncancelable Operating Leases	As of December 31, 2014, our minimum payments under the noncancelable operating leases were as follows (in thousands):


	Year Ending December 31:	Operating
	Year Ending December 31:	Lease
	2015	$	7,128
	2016		8,577
	2017		8,788
	2018		9,033
	2019		9,283
	Thereafter		27,963

	Total minimum lease payments	$	70,772

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
Stockholders' Equity (Tables)	Dec. 31, 2014
Equity [Abstract]
Summary of Common Stock Reserved	Common Stock
	As of December 31, 2014 and 2013, we had reserved shares of common stock for issuance as follows:


		As of		As of
		December 31,		December 31,
		2014		2013
	Stock options and awards issued and outstanding		5,550,417		6,452,832
	Stock options and awards available for grant under 2012 Plan		2,644,920		1,976,815
	Stock options and awards available for grant under the 2004 Plan		—		82,784

	Total		8,195,337		8,512,431

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
Stock-Based Compensation (Tables)	Dec. 31, 2014
Stock Option Activity	Stock Option Activity


		Stock			Weighted			Weighted			Aggregate
		Options			Average			Average			Intrinsic
		Outstanding			Exercise Price			Remaining			Value
								Contractual
								Life (Years)
											(In thousands)
	Balance—January 1, 2014		3,088,449		$	13.9			7.42		$	68,131
	Granted		346,084			39.02
	Canceled		(303,306	)		30.48
	Exercised		(911,538	)		12.33

	Balance—December 31, 2014		2,219,689		$	16.19			6.93		$	66,553

	Options exercisable—December 31, 2014		1,304,211		$	9.84			6.06		$	47,261

	Options vested and expected to vest—December 31, 2014		2,109,256		$	15.75			6.86		$	64,323

Stock Appreciation Rights Activity	Stock Appreciation Rights Activity


		Stock			Weighted			Weighted			Aggregate
		Appreciation			Average			Average			Intrinsic
		Rights			Exercise Price			Remaining			Value
		Outstanding						Contractual
								Life (Years)
											(In thousands)
	Balance—January 1, 2014		127,544		$	11.83			3.08		$	2,990
	Granted		—			—
	Canceled		(24,992	)		12.78
	Exercised		(85,893	)		11.37

	Balance—December 31, 2014		16,659		$	12.78			2.16		$	554

	Exercisable—December 31, 2014		3,077		$	11.61			2.06		$	106

	Vested and expected to vest—December 31, 2014		15,081		$	12.75			2.16		$	502

Restricted Stock Units Activity	Restricted Stock Units Activity


		RSUs			Weighted			Weighted			Aggregate
		Outstanding			Average			Average			Intrinsic
					Grant Date			Remaining			Value
					fair Value			Contractual
								Life (Years)
											(In thousands)
	Unvested—January 1, 2014		1,660,589		$	35.28			1.94		$	58,569
	Granted		1,612,050			44.34
	Canceled		(383,629	)		38.55
	Released		(757,441	)		34.32

	Unvested—December 31, 2014		2,131,569		$	41.73			2.24		$	98,247

	Restricted stock units expected to vest—December 31, 2014		1,632,663		$	42.36			2.1		$	75,151
Summary of Performance-Based Awards	The performance-based awards are summarized in the table below.


		PSUs			Weighted			Weighted			Aggregate
		Outstanding			Average			Average			Intrinsic
					Grant Date			Remaining			Value
					fair Value			Contractual
								Life (Years)
											(In thousands)
	Unvested—January 1, 2014		1,576,250		$	22.84			3		$	55,594
	Granted		—			—
	Canceled		(393,750	)		31.57
	Released		—			—

	Unvested—December 31, 2014		1,182,500		$	20.11			1.38		$	54,430

	Restricted stock units expected to vest—December 31, 2014		1,111,464		$	20.11			1.38		$	51,161
Assumptions Used to Estimate Fair Value of Employee Stock Option and Stock Appreciation Rights	The fair value of employee stock option awards is estimated on the date of grant using a Black-Scholes option-pricing model with the following weighted average assumptions:


		Year Ended December 31,
		2014			2013			2012
	Expected term (in years)		5.3			5.5			5.5
	Expected volatility		48	%		52	%		53	%
	Risk-free interest rate		1.7	%		1.2	%		0.9	%
	Dividend rate		0	%		0	%		0	%
Compensation Expense for Stock Based Awards Granted to Employees	We recorded compensation expense for the stock-based awards granted to employees and other compensation paid in stock as follows (in thousands):


		Years Ended December 31,
		2014			2013			2012
	Stock-based compensation:
	Cost of revenue	$	2,812		$	644		$	32
	Technology and development		9,466			5,659			930
	Sales and marketing		13,425			4,880			398
	General and administrative		15,770			9,266			1,210

	Total stock-based compensation expense		41,473			20,449			2,570

	Other compensation paid in stock:
	Cost of revenue		276			74			—
	Technology and development		1,205			706			—
	Sales and marketing		747			783			—
	General and administrative		1,232			961			—

	Total stock-based compensation expense and other compensation paid in stock		44,933			22,973			2,570

	Restructuring costs		82			—			—

	Total compensation paid in stock	$	45,015		$	22,973		$	2,570

Performance Based Award [Member]
Assumptions Used to Estimate Fair Value of Each Performance Based Awards	The fair value of the performance-based awards was estimated using a Monte Carlo simulation model with the following weighted average assumptions:


		As of			As of
		May 29,			August 29,
		2013			2013
	Stock price	$	30.31		$	41.67
	Simulation period		2.93 years			2.68 years
	Risk free rate		0.47	%		0.65	%
	Volatility		52.6	%		52.6	%
	Dividend yield		0	%		0	%
	Cost of equity		12.6	%		12.3	%

Net_Loss_per_Share_Attributabl1

Net Loss per Share Attributable to Common Stockholders (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Attributable to Common Stockholders	The following table sets for the computation of our basic and diluted net loss per share attributable to common stockholders during the years ended December 31, 2014, 2013 and 2012 (in thousands, except share and per share data):


		Year Ended December 31,
		2014			2013			2012
	Net loss attributable to common stockholders	$	(75,763	)	$	(17,759	)	$	(10,921	)

	Shares used in computing net loss per share attributable to common stockholders, basic and diluted		37,335,200			33,129,572			12,538,769

	Net loss per share attributable to common stockholders, basic and diluted	$	(2.03	)	$	(0.54	)	$	(0.87	)


Summary of Outstanding Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share	The following outstanding shares of common stock equivalents were excluded from the computation of the diluted net loss per share attributable to common stockholders for the periods presented because including them would have been antidilutive:


		Year Ended December 31,
		2014			2013			2012
	Stock options to purchase common stock		2,219,689			3,088,449			3,570,566
	Restricted stock units		3,314,069			3,236,839			37,760
	Stock appreciation rights		16,659			127,544			—
	Heldback shares in connection with Movity acquisition		—			30,524			30,524
	Common stock warrants		—			—			56,054
	Convertible senior notes		6,400,969			6,400,969			—

Market_Leader_Restructuring_Ta

Market Leader Restructuring (Tables)	12 Months Ended
Market Leader Restructuring (Tables)	Dec. 31, 2014
Restructuring and Related Activities [Abstract]
Summary of Total Restructuring Activities	A summary of total restructuring activities is shown in the table below (in thousands):


		One-time			Contract			Other			Total
		Termination			Termination			Associated
		Benefits			Costs			Costs
	Restructuring costs	$	598		$	2,168		$	877		$	3,643
	Cash payments		(329	)		—			(649	)		(978	)

	Balance as of June 30, 2014		269			2,168			228			2,665

	Restructuring costs		565			614			45			1,224
	Cash payments		(591	)		(6	)		(192	)		(789	)
	Non-cash charges		(82	)		—			—			(82	)
	Change in estimate		(25	)		—			(45	)		(70	)

	Balance as of September 30, 2014		136			2,776			36			2,948
	Restructuring costs		—			—			257			257
	Cash payments		(41	)		(150	)		(90	)		(281	)
	Change in estimate		—			—			(67	)		(67	)

	Balance as of December 31, 2014	$	95		$	2,626		$	136		$	2,857

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Components of Provision for Income Taxes	The components of the provision for income taxes for the years ended December 31, 2014, 2013 and 2012 are as follows (in thousands):


		Year Ended December 31,
		2014			2013			2012
	Current:
	State	$	427		$	412		$	67
	Deferred:
	Federal		—			(5,123	)		—
	State		—			(2,800	)		—

	TOTAL	$	427		$	(7,511	)	$	67

Reconciliation of Statutory Federal Income Tax Rate to Actual Tax Rate	A reconciliation of the statutory federal income tax rate of 35% and 34% for 2014 and 2013, respectively, to the actual tax rate for the years ended December 31 is as follows (in thousands):


		As of December 31,
		2014			2013
	Tax at federal statutory rate	$	(26,430	)	$	(8,592	)
	Permanent items		244			128
	State taxes		(844	)		(499	)
	Net operating loss not benefitted		21,110			8,004
	Acquisition related costs		6,216			1,072
	Valuation allowance release		—			(7,923	)
	Stock-based compensation		131			299

	Income tax expense	$	427		$	(7,511	)

Deferred Tax Assets and Liabilities	Deferred income taxes reflect the net tax effect of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes, and the amount used for income tax purposes. Our deferred tax assets and liabilities are detailed below (in thousands):


		As of December 31,
		2014			2013
	Assets:
	Net operating loss carryforwards	$	50,824		$	40,828
	Tax credit carryforwards		8,371			5,210
	Accruals and reserves		8,337			5,082
	Stock-based compensation		10,891			9,034
	Other		16			27

	Gross deferred tax assets		78,439			60,181
	Valuation allowance		(46,191	)		(20,995	)

	Total deferred tax assets		32,248			39,186

	Liabilities:
	Deferred Revenue		—			(58	)
	Prepaid expenses and other		(1,097	)		(1,085	)
	Fixed assets and intangibles		(31,151	)		(38,043	)

	Total deferred tax liabilities		(32,248	)		(39,186	)

	Net deferred tax assets	$	—		$	—
Schedule of Net Deferred Tax Assets and Liabilities	Total net deferred tax assets and liabilities are included in the Company’s consolidated balance sheets as follows:


		As of December 31,
		2014			2013
	Current deferred tax assets	$	1,206		$	3,038
	Non-current deferred tax assets		—			2,525
	Non-current deferred tax liabilities		(1,206	)		(5,563	)

	Net deferred tax liabilities	$	—		$	—

Reconciliation of Unrecognized Tax Benefits	A reconciliation of our unrecognized tax benefits, excluding accrued interest and penalties, for 2014, 2013 and 2012 is as follows (in thousands):


		As of December 31,
		2014			2013			2012
	Balance at the beginning of the year	$	2,336		$	20		$	475
	Increases (decreases) related to prior year tax positions		1,253			—			(475	)
	Current year increases		3,113			2,316			20

	Balance at the end of the year	$	6,702		$	2,336		$	20

Organization_and_Description_o1

Organization and Description of Business - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended		3 Months Ended	12 Months Ended			0 Months Ended
	Aug. 20, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 17, 2013	Jul. 28, 2014
Business Acquisition [Line Items]
Common stock conversion ratio	0.1553
Business acquisition, number of shares issued	4,412,489
Business acquisition, cash paid on acquisition	$170,500,000
Common stock conversion basis				Under the terms and conditions of the Market Leader Merger Agreement, each outstanding share of Market Leader common stock was converted into the right to receive (a) $6.00 in cash, without interest, and subject to applicable withholding tax, and (b) 0.1553 of a share of the Company's common stock, for a total purchase price of $372.7 million.	Under the terms and conditions of the Agreement and Plan of Merger ("Market Leader Merger Agreement") each outstanding share of Market Leader common stock was converted into the right to receive (a) $6.00 in cash, without interest, and subject to applicable withholding tax, and (b) 0.1553 of a share of our common stock, for a total purchase consideration of $372.7 million.
Common stock conversion right to receive cash per share	$6
Total purchase consideration	372,700,000
Sale of aggregate shares of common stock		4,025,000	5,900,000
Public offering price		$29.75	$17
Underwriter allotment		525,000	900,000
Sold by existing shareholders		3,117,311	1,000,000
Shares sold pursuant to exercise by the underwriters		406,606
Proceeds from follow-on public offering, net of underwriting discounts		113,000,000				114,056,000
Proceeds from initial public offering, net of underwriting discounts			89,400,000				93,279,000
Conversion preferred stock into common stock			14,161,444
Warrant to purchase convertible preferred stock converted into warrants to purchase common stock			120,961
Zillow Group Inc. [Member]
Business Acquisition [Line Items]
Acquisition agreement date					28-Jul-14
Zebra Hold Co Inc. [Member] \| Common Class A [Member]
Business Acquisition [Line Items]
Common stock conversion ratio									0.444
Number votes per common stock					One vote
Zebra Hold Co Inc. [Member] \| Common Class A [Member] \| Zillow Group Inc. [Member]
Business Acquisition [Line Items]
Common stock conversion ratio									1
Zebra Hold Co Inc. [Member] \| Common Class B [Member]
Business Acquisition [Line Items]
Number votes per common stock					Ten votes
Zebra Hold Co Inc. [Member] \| Common Class B [Member] \| Zillow Group Inc. [Member]
Business Acquisition [Line Items]
Common stock conversion ratio									1
2.75% Convertible Senior Notes [Member]
Business Acquisition [Line Items]
Debt instrument, aggregate principal amount								230,000,000
Debt instrument, interest rate stated percentage								2.75%
Proceeds from over-allotment of option granted to initial purchasers								30,000,000
Debt instrument, redemption period end date					15-Dec-20
Net proceeds received								222,400,000
Debt instrument, frequency of period payment					Semi-annually every June 15 and December 15
Debt instrument, date of first payment					15-Jun-14			15-Jun-14
Debt instrument, redemption period start date					20-Dec-18
Debt instrument, convertible threshold percentage								130.00%
Debt instrument, convertible threshold consecutive trading days								30 days
Debt instrument, conversion rate principal amount								$1,000
Debt instrument, conversion rate shares								27.8303
Debt instrument, date of interest began to accrue					17-Dec-13
130% Conversion Price [Member] \| 2.75% Convertible Senior Notes [Member]
Business Acquisition [Line Items]
Debt instrument, convertible threshold consecutive trading days								20 days

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
		Segment	Customer
		Customer
Summary Of Accounting Policies [Line Items]
Percentage of gross accounts receivable represented by customer		10.00%	13.00%
Number of customer accounted for 10% or more of Company's gross accounts receivable		0
Number of customer accounted for 13% Company's gross accounts receivable			1
Advertising expense		$33,800,000	$7,700,000	$2,600,000
Other comprehensive income		0	0	0
Number of outstanding preferred stock converted into common stock	14,161,444
Number of outstanding preferred stock warrants converted into common stock warrants	56,054
Cash and cash equivalents, original maturities		Three months or less at the time of acquisition
Amounts due from third-party merchant		469,000	349,000
Provision for uncollectible accounts receivable		-135,000	351,000	95,000
Restricted cash		6,700,000	1,600,000
Certificates of deposit contractual maturities		Less than three years
Impairment of goodwill		0	0	0
Number of reportable segment		1
Revenue [Member]
Summary Of Accounting Policies [Line Items]
Number of customers accounted for 10% or more of total revenue		0	0	0
Capitalized product development costs [Member]
Summary Of Accounting Policies [Line Items]
Capitalized costs associated with product development		19,100,000	8,200,000	2,500,000
Amortization expense		6,400,000	2,700,000	1,100,000
Net book value of capitalized product development costs		$11,500,000	$7,500,000
Amortization period of capitalized costs associated with product development		2 years
Customer Concentration Risk [Member] \| Revenue [Member]
Summary Of Accounting Policies [Line Items]
Percentage of total revenue represented by customer		10.00%	10.00%	10.00%

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Schedule of Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2014
Computer equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	2 years
Computer equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	3 years
Office equipment, furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	3 years
Capitalized product development costs [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	2 years
Capitalized product development costs [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	3 years
Network equipment [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	5 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	Shorter of the lease term or 5 years

Summary_of_Significant_Account5

Summary of Significant Accounting Policies - Schedule of Useful Lives of Purchased Intangible Assets (Detail)	0 Months Ended	12 Months Ended
	Aug. 20, 2013	Dec. 31, 2014
Enterprise relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets, useful lives (in Years)	10 years	10 years
Premium users [Member]
Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets, useful lives (in Years)	5 years	5 years
Existing technology [Member]
Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets, useful lives (in Years)	7 years	7 years
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets, useful lives (in Years)	10 years	10 years
Home/MLS data feeds [Member]
Finite-Lived Intangible Assets [Line Items]
Purchased intangible assets, useful lives (in Years)	10 years	10 years

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of convertible notes	$343,600,000	$252,000,000
Carrying value of convertible notes	230,000,000	230,000,000
Fair value remeasurement of warrants charged to earnings			369,000
Held by the Company unrealized losses	0	0
Held by the Company realized losses	0	0
Held by the Company other-than-temporary impairment losses	0	0
Increase in restricted cash	5,128,000	791,000	764,000
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Certificates of deposit with maturities period	3 years
New lease agreement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase in restricted cash	3,800,000
Amendment to lease agreement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase in restricted cash	$968,000

Fair_Value_Measurements_Summar

Fair Value Measurements - Summary of Fair Value Assumptions (Detail) (2.75% Convertible Senior Notes [Member], USD $)	12 Months Ended
	Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Stock price	$46.03
Time to maturity	5 years 11 months 12 days
Volatility	51.00%
Risk free rate	1.80%
Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount spread	8.50%
Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount spread	10.50%

Fair_Value_Measurements_Schedu

Fair Value Measurements - Schedule of Fair Value of Financial Assets Remeasured on Recurring Basis (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financial Assets:
Total financial assets	$13,400	$8,272
Money market funds [Member]
Financial Assets:
Total financial assets	6,683	6,683
Restricted cash [Member]
Financial Assets:
Total financial assets	6,717	1,589
Level I [Member]
Financial Assets:
Total financial assets	13,400	8,272
Level I [Member] \| Money market funds [Member]
Financial Assets:
Total financial assets	6,683	6,683
Level I [Member] \| Restricted cash [Member]
Financial Assets:
Total financial assets	6,717	1,589
Level II [Member]
Financial Assets:
Total financial assets
Level II [Member] \| Money market funds [Member]
Financial Assets:
Total financial assets
Level II [Member] \| Restricted cash [Member]
Financial Assets:
Total financial assets
Level III [Member]
Financial Assets:
Total financial assets
Level III [Member] \| Money market funds [Member]
Financial Assets:
Total financial assets
Level III [Member] \| Restricted cash [Member]
Financial Assets:
Total financial assets

Balance_Sheet_Components_Prope

Balance Sheet Components - Property and Equipment (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total property and equipment	$70,675	$33,521
Less: accumulated depreciation and amortization	-20,920	-11,232
Total property and equipment, net	49,755	22,289
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	8,534	7,275
Capitalized product development costs [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	21,822	9,934
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	5,323	3,276
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	22,209	8,985
Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	1,908	183
Assets not yet in service [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$10,879	$3,868

Balance_Sheet_Components_Addit

Balance Sheet Components - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Depreciation expense	$13.10	$6.40	$3.60

Balance_Sheet_Components_Accru

Balance Sheet Components - Accrued Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Legal and professional fees	$1,344	$2,253
Marketing and advertising expenses	2,494	1,326
Interest	316	246
Sales taxes	3,190	2,355
Payroll taxes	426	651
Acquisition of property and equipment	1,216	3,084
Restructuring costs	2,857
Other	2,040	1,346
Total accrued liabilities	$13,883	$11,261

Balance_Sheet_Components_Accru1

Balance Sheet Components - Accrued Compensation and Benefits (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Compensation Related Costs [Abstract]
Bonus	$3,579	$3,645
Payroll and related expenses	3,121	3,191
Commissions	2,160	2,166
Vacation	1,727	1,861
Total accrued compensation and benefits	$10,587	$10,863

Acquisition_of_Market_Leader_A

Acquisition of Market Leader - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended
	Aug. 20, 2013	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013
Business Acquisition [Line Items]
Fair value of common stock shares issued	4,412,489
Business acquisition cash paid on acquisition	$170,500,000
Common stock conversion basis		Under the terms and conditions of the Market Leader Merger Agreement, each outstanding share of Market Leader common stock was converted into the right to receive (a) $6.00 in cash, without interest, and subject to applicable withholding tax, and (b) 0.1553 of a share of the Company's common stock, for a total purchase price of $372.7 million.	Under the terms and conditions of the Agreement and Plan of Merger ("Market Leader Merger Agreement") each outstanding share of Market Leader common stock was converted into the right to receive (a) $6.00 in cash, without interest, and subject to applicable withholding tax, and (b) 0.1553 of a share of our common stock, for a total purchase consideration of $372.7 million.
Common stock conversion right to receive cash per share	$6
Common stock conversion ratio	0.1553
Total purchase price	372,700,000
Adjustments to purchase price made during measurement period			0
Tax benefit resulted from acquisition				6,700,000
Market Leader Inc. [Member]
Business Acquisition [Line Items]
Fair value of common stock shares issued	4,412,489
Business acquisition cash paid on acquisition	170,497,000
Total purchase price	372,700,000
Date of acquisition			20-Aug-13
Acquired net deferred tax liability	7,900,000
Acquisition-related costs					6,100,000
Revenue					21,200,000
Net income (loss) attributable to common shareholders					$9,300,000

Acquisition_of_Market_Leader_S

Acquisition of Market Leader - Summary of Purchase Price Components (Detail) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Aug. 20, 2013
Business Acquisition [Line Items]
Cash paid for the outstanding stock of Market Leader	$170,500
Market Leader Inc. [Member]
Business Acquisition [Line Items]
Cash paid for the outstanding stock of Market Leader	170,497
Fair value of common stock transferred as consideration for the outstanding stock of Market Leader (4,412,489 shares)	189,296
Fair value of vested equity awards assumed by us	12,871
Total purchase price	$372,664

Acquisition_of_Market_Leader_S1

Acquisition of Market Leader - Summary of Purchase Price Components (Parenthetical) (Detail)	0 Months Ended
	Aug. 20, 2013
Business Acquisition [Line Items]
Shares issued in acquisition as part of purchase price	4,412,489
Market Leader Inc. [Member]
Business Acquisition [Line Items]
Shares issued in acquisition as part of purchase price	4,412,489

Acquisition_of_Market_Leader_S2

Acquisition of Market Leader - Schedule of Purchase Consideration Allocated to Assets Acquired and Liabilities Assumed (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 20, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 20, 2013
Business Acquisition [Line Items]
Goodwill	$255,904	$255,904	$2,155
Market Leader Inc. [Member]
Business Acquisition [Line Items]
Cash				9,662
Short-term investments				2,999
Other identifiable tangible assets				3,732
Total tangible assets				16,393
Accounts payable				-7,058
Accrued expenses and other current liabilities				-3,104
Accrued compensation and benefits				-2,253
Other identifiable liabilities				-8,163
Total liabilities				-20,578
Net acquired tangible assets				-4,185
Identifiable intangible assets				123,100
Goodwill				253,749
Total purchase price allocation				$372,664

Acquisition_of_Market_Leader_C

Acquisition of Market Leader - Components of Intangible Assets Acquired (Detail) (USD $)	0 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Aug. 20, 2013	Dec. 31, 2014	Aug. 20, 2013
Business Acquisition [Line Items]
Total intangible assets acquired	$123,100		$123,100
Enterprise relationships [Member]
Business Acquisition [Line Items]
Total intangible assets acquired	29,000		29,000
Estimated Amortization Period (in Years)	10 years	10 years
Premium users [Member]
Business Acquisition [Line Items]
Total intangible assets acquired	15,200		15,200
Estimated Amortization Period (in Years)	5 years	5 years
Existing technology [Member]
Business Acquisition [Line Items]
Total intangible assets acquired	32,300		32,300
Estimated Amortization Period (in Years)	7 years	7 years
Trade names [Member]
Business Acquisition [Line Items]
Total intangible assets acquired	42,900		42,900
Estimated Amortization Period (in Years)	10 years	10 years
Home/MLS data feeds [Member]
Business Acquisition [Line Items]
Total intangible assets acquired	$3,700		$3,700
Estimated Amortization Period (in Years)	10 years	10 years

Acquisition_of_Market_Leader_S3

Acquisition of Market Leader - Summary of Unaudited Pro Forma Condensed Combined Financial Information (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition, Pro Forma Information [Abstract]
Revenue	$178,151	$113,073
Net loss attributable to common shareholders	($33,056)	($49,461)
Net loss per share attributable to common shareholders-basic and diluted	($0.92)	($2.92)

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Schedule of Goodwill (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 20, 2013
Goodwill [Line Items]
Goodwill, beginning balance	$255,904		$2,155
Change in goodwill	0
Goodwill, ending balance	255,904		2,155
Market Leader Inc. [Member]
Goodwill [Line Items]
Goodwill, beginning balance				253,749
Goodwill recorded in connection with the acquisition of Market Leader		253,749
Goodwill, ending balance				$253,749

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Schedule of Intangible Assets Subject to Amortization (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross	$123,991	$123,801
Accumulated Amortization	-21,424	-5,913
Intangible assets, Net	102,567	117,888
Enterprise relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	29,000	29,000
Accumulated Amortization	-3,952	-1,052
Intangible assets, Net	25,048	27,948
Premium users [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	15,200	15,200
Accumulated Amortization	-4,143	-1,103
Intangible assets, Net	11,057	14,097
Existing technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	32,300	32,300
Accumulated Amortization	-6,289	-1,675
Intangible assets, Net	26,011	30,625
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	42,900	42,900
Accumulated Amortization	-5,847	-1,557
Intangible assets, Net	37,053	41,343
Home/MLS data feeds [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	3,700	3,700
Accumulated Amortization	-504	-134
Intangible assets, Net	3,196	3,566
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	891	701
Accumulated Amortization	-689	-392
Intangible assets, Net	$202	$309

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for intangible assets	$15.70	$5.80

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets - Schedule of Future Amortization Expense (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
2015	$15,311
2016	15,230
2017	15,230
2018	14,127
2019	12,190
Thereafter	30,479
Intangible assets, Net	$102,567	$117,888

Debt_Additional_Information_De

Debt - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended	1 Months Ended	12 Months Ended	0 Months Ended
Debt - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2014	Dec. 17, 2013	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2013
Debt Instrument [Line Items]
Payment of debt issuance costs	$6,910,000
Fair value of convertible notes	252,000,000	343,600,000				252,000,000
Zillow Group Inc. [Member]
Debt Instrument [Line Items]
Acquisition completion date		17-Feb-15
Credit Facility [Member]
Debt Instrument [Line Items]
Amount of interest expense recognized	241,000				167,000
Secured term loan credit facility				20,000,000
Frequency of loan repayment		30 equal monthly installments
Term loan maturity date		Mar-15
Credit facility unused amount expired					10,000,000
Warrants to purchase shares				120,961
Exercise price of convertible preferred stock				$8.47
Warrants purchased against convertible preferred shares				56,054
Aggregate fair value of warrants				281,000
Net facility charge				165,000
Line of credit facility, outstanding amount repaid			7,200,000
Loss on debt extinguishment			141,000
Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Extended maturity date		Mar-15
Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Extended maturity date		Sep-15
Credit Facility [Member] \| First Tranche [Member]
Debt Instrument [Line Items]
Proceeds from secured term loan credit facility				5,000,000
Credit Facility [Member] \| First Tranche [Member] \| Minimum [Member] \| Prime Rate Basis [Member]
Debt Instrument [Line Items]
Interest rate on loan				2.75%
Credit Facility [Member] \| First Tranche [Member] \| Maximum [Member] \| Prime Rate Basis [Member]
Debt Instrument [Line Items]
Interest rate on loan				6.00%
Credit Facility [Member] \| Second Tranche [Member]
Debt Instrument [Line Items]
Proceeds from secured term loan credit facility				5,000,000
Credit Facility [Member] \| Second Tranche [Member] \| Minimum [Member] \| Prime Rate Basis [Member]
Debt Instrument [Line Items]
Interest rate on loan				5.50%
Credit Facility [Member] \| Third Tranche [Member] \| Maximum [Member] \| Prime Rate Basis [Member]
Debt Instrument [Line Items]
Interest rate on loan				8.75%
2.75% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount			230,000,000
Proceeds from over-allotment of option granted to initial purchasers			30,000,000
Debt instrument, due date		15-Dec-20
Net proceeds received			222,400,000
Debt instrument, interest rate stated percentage			2.75%
Debt instrument, frequency of period payment		Semi-annually on June 15 and December 15
Debt instrument, date of first payment		15-Jun-14	15-Jun-14
Debt instrument, redemption period start date		20-Dec-18
Debt instrument, convertible threshold percentage			130.00%
Debt instrument, convertible threshold trading days			20
Debt instrument, convertible threshold consecutive trading days			30 days
Debt instrument, conversion rate principal amount			1,000
Debt instrument, conversion rate shares			27.8303
Initial conversion price			$35.93
Repurchase price percentage of principal amount			100.00%
Number of financial covenants		0
Payment of debt issuance costs			7,600,000
Amount of interest expense recognized		7,300,000
Amortization of debt issuance costs						$284,000

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended		1 Months Ended	12 Months Ended
	Apr. 10, 2014	Mar. 10, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Jul. 25, 2014	Apr. 10, 2014	Mar. 10, 2014
	Apr. 10, 2014	Mar. 10, 2014	sqft	Dec. 31, 2014	Dec. 31, 2013	sqft	sqft	sqft
Loss Contingencies [Line Items]
Lease agreement term	90 months	107 months	97 months
Area of leased office space	65,000	79,000	72,000				65,000	79,000
Effective lease agreement date	1-May-14	1-Nov-14
Additional area of leased office space						26,620
Rent abatement period	6 months		13 months
Lease Expiration date			30-Sep-21
Rent expense				$5,700,000	$3,600,000
Minimum [Member]
Loss Contingencies [Line Items]
Lease agreement term				1 year
Future minimum lease payments per month	124,000	182,000	193,000				124,000	182,000
Maximum [Member]
Loss Contingencies [Line Items]
Lease agreement term				9 years
Future minimum lease payments per month	141,000	347,000	235,000				141,000	347,000
Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Obligations related to indemnification agreements				$0	$0

Commitments_and_Contingencies_2

Commitments and Contingencies - Schedule of Minimum Payments under Noncancelable Operating Leases (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
2015	$7,128
2016	8,577
2017	8,788
2018	9,033
2019	9,283
Thereafter	27,963
Total minimum lease payments	$70,772

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Feb. 28, 2013	Dec. 31, 2013	Dec. 31, 2014	Sep. 30, 2012
Class of Stock [Line Items]
Payments for repurchase of common stock	$30,000		$30,032
Common stock repurchased shares	1,085,383
Purchase price per share of the common stock repurchased	$27.64
Exercise price of warrant		$8.47
Shares issued pursuant to warrants exercised		39,025
Preferred stock, authorized	20,000,000		20,000,000	20,000,000
Preferred stock, par value	$0.00		$0.00	$0.00
Preferred stock, issued	0		0	0
Preferred stock, outstanding	0		0	0
Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, authorized					20,000,000
Preferred stock, par value					$0.00
Preferred stock, issued	0		0	0
Preferred stock, outstanding	0		0	0

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of Common Stock Reserved (Detail)	Dec. 31, 2014	Dec. 31, 2013
Conversion of Stock [Line Items]
Stock options and awards issued and outstanding	5,550,417	6,452,832
Total	8,195,337	8,512,431
2012 Plan [Member]
Conversion of Stock [Line Items]
Stock options and awards available for grant	2,644,920	1,976,815
2004 Plan [Member]
Conversion of Stock [Line Items]
Stock options and awards available for grant		82,784

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended	4 Months Ended	6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 05, 2013	Aug. 31, 2013	Dec. 31, 2014	Sep. 19, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	8,195,337	8,512,431				8,195,337
Weighted average grant date fair value of options granted	$17.36	$15.24	$6.77
Options exercises in period aggregate intrinsic value	$30,000,000	$45,900,000	$5,300,000
Options vested, grant date fair value	7,500,000	6,400,000	4,600,000
Unrecognized compensation cost related to non-vested stock options granted, net	10,500,000					10,500,000
Weighted average vesting period	2 years 2 months 1 day
Stock-based compensation expense	44,933,000	22,973,000	2,570,000
Weighted average remaining vesting period of stock units	6 years 10 months 10 days
Recognized compensation cost	41,473,000	20,449,000	2,570,000
Expected dividend	0
2005 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum grant price per share as a percentage of fair market value at the date of the grant	100.00%
Percentage of options vested	25.00%					25.00%
Options vesting period	1 year
Options expiration period	10 years
Certain options, vesting terms	Certain options vest monthly over two to four years.
Ratio of remaining options shares vested	0.028
2012 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum grant price per share as a percentage of fair market value at the date of the grant	100.00%
Options expiration period	10 years
Common stock reserved for future issuance							2,370,000
Additional number of shares reserved for future issuance							1,000,000
Increase in shares available for issuance	2,100,000
Percentage of increase in shares available for issuance	4.00%
Purchase price of RSUs granted	$0					$0
Increase in shares available for grant under the 2012 plan	1,529,297	1,463,303				1,529,297
Increase in share approved by stockholders				2,000,000
2012 and 2004 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for grant under equity incentive plan	2,644,920	2,059,599				2,644,920
2004 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for grant under equity incentive plan	0					0
Options expiration date	9-Dec-14
Stock Option Activity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated forfeitures of stock-based awards granted	5,700,000
Stock Appreciation Rights Activity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Certain options, vesting terms	Our stock appreciation rights typically vest on a graded basis over either a two or four year period and typically expire on the earlier of five years from the date of grant or ninety days following termination of employment.
Estimated forfeitures of stock-based awards granted	423,000
Aggregate intrinsic value, Exercised	3,600,000	908,000
Estimated grant date fair value vested	2,000,000	736,000
Unrecognized compensation cost related to non-vested stock units, net of estimated forfeitures	767,000,000,000					767,000,000,000
Weighted average vesting period of stock units	1 year 2 months 5 days
Stock unit awards granted during period	0
Non-vested RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated forfeitures of stock-based awards granted	19,300,000
Unrecognized compensation cost related to non-vested stock units, net of estimated forfeitures	77,800,000					77,800,000
Weighted average remaining vesting period of stock units	2 years 1 month 6 days
Stock unit awards granted during period	1,612,050
Performance Based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated forfeitures of stock-based awards granted	7,700,000
Unrecognized compensation cost related to non-vested stock units, net of estimated forfeitures	13,800,000					13,800,000
Weighted average vesting period of stock units	1 year 4 months 17 days
Stock unit awards granted during period	0
Recognized compensation cost	5,400,000	4,400,000	0
Market Leader Acquisition [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit awards granted during period					2,105,000
Market Leader Acquisition [Member] \| Performance Based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit awards granted during period					1,576,250
Market Leader Acquisition [Member] \| Time based awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit awards granted during period					528,750
Zillow Group Inc. [Member] \| Non-vested RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Certain options, vesting terms						These awards were set to vest on the earlier of (i) immediately prior to the closing of the Merger, or (ii) 18 months.
Weighted average vesting period of stock units						18 months
Stock-based compensation expense						6,900,000
Nonemployees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation cost	1,600,000	0	58,000,000
Stock based awards granted to non-employees	3,911	0	0
Product development costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capitalized stock-based compensation	$3,100,000	$685,000	$66,000

StockBased_Compensation_Stock_

Stock-Based Compensation - Stock Option Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options Outstanding, Beginning balance	3,088,449
Stock Options Outstanding, Granted	346,084
Stock Options Outstanding, Canceled	-303,306
Stock Options Outstanding, Exercised	-911,538
Stock Options Outstanding, Ending balance	2,219,689	3,088,449
Stock Options Outstanding, Options exercisable	1,304,211
Stock Options Outstanding, Options vested and expected to vest	2,109,256
Weighted Average Exercise Price, Beginning balance	$13.90
Weighted Average Exercise Price, Granted	$39.02
Weighted Average Exercise Price, Canceled	$30.48
Weighted Average Exercise Price, Exercised	$12.33
Weighted Average Exercise Price, Ending balance	$16.19	$13.90
Weighted Average Exercise Price, Options exercisable	$9.84
Weighted Average Exercise Price, Options vested and expected to vest	$15.75
Weighted Average Remaining Contractual Life (Years)	6 years 11 months 5 days	7 years 5 months 1 day
Weighted Average Remaining Contractual Life (Years), Options exercisable	6 years 22 days
Weighted Average Remaining Contractual Life (Years), Options vested and expected to vest	6 years 10 months 10 days
Aggregate Intrinsic Value, Beginning balance	$68,131
Aggregate Intrinsic Value, Ending balance	66,553	68,131
Aggregate Intrinsic Value, Options exercisable	47,261
Aggregate Intrinsic Value, Options vested and expected to vest	$64,323

StockBased_Compensation_Stock_1

Stock-Based Compensation - Stock Appreciation Rights Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Stock Appreciation Rights Activity [Line Items]
Number of shares, Exercised	-85,893	-32,169
Stock Appreciation Rights Activity [Member]
Stock Appreciation Rights Activity [Line Items]
Number of shares, Beginning balance	127,544
Number of shares, Granted	0
Number of shares, Canceled	-24,992
Number of shares, Exercised	-85,893
Number of shares, Ending balance	16,659	127,544
Number of shares, Exercisable	3,077
Number of shares, Vested and expected to vest	15,081
Weighted Average Exercise Price, Beginning balance	11.83
Weighted Average Exercise Price, Granted	0
Weighted Average Exercise Price, Canceled	12.78
Weighted Average Exercise Price, Exercised	11.37
Weighted Average Exercise Price, Ending balance	12.78	11.83
Weighted Average Exercise Price, Exercisable	11.61
Weighted Average Exercise Price, Vested and expected to vest	12.75
Weighted Average Remaining Contractual Life (Years)	2 years 1 month 28 days	3 years 29 days
Weighted Average Remaining Contractual Life (Years), Exercisable	2 years 22 days
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest	2 years 1 month 28 days
Aggregate Intrinsic Value, Beginning balance	2,990
Aggregate Intrinsic Value, Ending balance	554	2,990
Aggregate Intrinsic Value, Exercisable	106
Aggregate Intrinsic Value, Vested and expected to vest	502

StockBased_Compensation_Restri

Stock-Based Compensation - Restricted Stock Units Activity (Detail) (Non-vested RSUs [Member], USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Non-vested RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, Beginning balance	1,660,589
Number of shares, Granted	1,612,050
Number of shares, Canceled	-383,629
Number of shares, Released	-757,441
Number of shares, Ending balance	2,131,569	1,660,589
Number of shares, Restricted stock units expected to vest	1,632,663
Weighted Average Grant Date fair Value, Beginning balance	$35.28
Weighted Average Grant Date fair Value, Granted	$44.34
Weighted Average Grant Date fair Value, Canceled	$38.55
Weighted Average Grant Date fair Value, Released	$34.32
Weighted Average Grant Date fair Value, Ending balance	$41.73	$35.28
Weighted Average Grant Date fair Value, Restricted stock units expected to vest	$42.36
Weighted Average Remaining Contractual Life (Years), Unvested	2 years 2 months 27 days	1 year 11 months 9 days
Weighted Average Remaining Contractual Life (Years), Restricted stock units expected to vest	2 years 1 month 6 days
Aggregate Intrinsic Value, Beginning balance	$58,569
Aggregate Intrinsic Value, Ending balance	98,247	58,569
Aggregate Intrinsic Value, Restricted stock units expected to vest	$75,151

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Performance-Based Awards (Detail) (Performance Based Award [Member], USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Performance Based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, Beginning balance	1,576,250
Number of shares, Granted	0
Number of shares, Canceled	-393,750
Number of shares, Released	0
Number of shares, Ending balance	1,182,500	1,576,250
Number of shares, Restricted stock units expected to vest-December 31, 2014	1,111,464
Weighted Average Grant Date fair Value, Beginning balance	$22.84
Weighted Average Grant Date fair Value, Granted	$0
Weighted Average Grant Date fair Value, Canceled	$31.57
Weighted Average Grant Date fair Value, Released	$0
Weighted Average Grant Date fair Value, Ending balance	$20.11	$22.84
Weighted Average Grant Date fair Value, Restricted stock units expected to vest	$20.11
Weighted Average Remaining Contractual Life (Years), Unvested	1 year 4 months 17 days	3 years
Weighted Average Remaining Contractual Life (Years), Restricted stock units expected to vest-December 31, 2014	1 year 4 months 17 days
Aggregate Intrinsic Value, Beginning balance	$55,594
Aggregate Intrinsic Value, Ending balance	54,430	55,594
Aggregate Intrinsic Value, Restricted stock units expected to vest-December 31, 2014	$51,161

StockBased_Compensation_Assump

Stock-Based Compensation - Assumptions Used to Estimate Fair Value of Employee Stock Option and Equity Classified Stock Appreciation Right Awards (Detail) (Black-Scholes option-pricing model [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Black-Scholes option-pricing model [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	5 years 3 months 18 days	5 years 6 months	5 years 6 months
Expected volatility	48.00%	52.00%	53.00%
Risk-free interest rate	1.70%	1.20%	0.90%
Dividend rate	0.00%	0.00%	0.00%

StockBased_Compensation_Assump1

Stock-Based Compensation - Assumptions Used to Estimate Fair Value of Each Performance Based Awards (Detail) (Monte Carlo simulation model [Member], Performance Based Award [Member], USD $)	0 Months Ended
	Aug. 29, 2013	29-May-13	Aug. 29, 2013	29-May-13
Monte Carlo simulation model [Member] \| Performance Based Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price	$41.67	$30.31	$41.67	$30.31
Expected term (in years)	2 years 8 months 5 days	2 years 11 months 5 days
Risk free rate	0.65%	0.47%
Volatility	52.60%	52.60%
Dividend yield	0.00%	0.00%
Cost of equity	12.30%	12.60%

StockBased_Compensation_Compen

Stock-Based Compensation - Compensation Expense for Stock Based Awards Granted to Employees (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$41,473	$20,449	$2,570
Other compensation paid in stock	3,460	2,524
Total stock-based compensation expense and other compensation paid in stock	44,933	22,973	2,570
Total compensation paid in stock	45,015	22,973	2,570
Cost of revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	2,812	644	32
Other compensation paid in stock	276	74
Technology and development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	9,466	5,659	930
Other compensation paid in stock	1,205	706
Sales and marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	13,425	4,880	398
Other compensation paid in stock	747	783
General and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	15,770	9,266	1,210
Other compensation paid in stock	1,232	961
Restructuring cost [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Other compensation paid in stock	$82

Net_Loss_per_Share_Attributabl2

Net Loss per Share Attributable to Common Stockholders - Computation of Basic and Diluted Earnings Attributable to Common Stockholders (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net loss attributable to common stockholders	($75,763)	($17,759)	($10,921)
Shares used in computing net loss per share attributable to common stockholders, basic and diluted	37,335,200	33,129,572	12,538,769
Net loss per share attributable to common stockholders, basic and diluted	($2.03)	($0.54)	($0.87)

Net_Loss_per_Share_Attributabl3

Net Loss per Share Attributable to Common Stockholders - Summary of Outstanding Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock options to purchase common stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock	2,219,689	3,088,449	3,570,566
Restricted stock units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock	3,314,069	3,236,839	37,760
Stock Appreciation Rights [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock	16,659	127,544
Heldback shares in connection with Movity acquisition [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock		30,524	30,524
Common stock warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock			56,054
Convertible senior notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock	6,400,969	6,400,969

Market_Leader_Restructuring_Ad

Market Leader Restructuring - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2014
	Employees	Dec. 31, 2014
Reorganizations [Abstract]
Reduction of market leader head count	83
Restructuring costs		$4,987,000
Restructuring costs accruals		$2,900,000

Market_Leader_Restructuring_Su

Market Leader Restructuring - Summary of Total Restructuring Activities (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014
Reorganization Items [Line Items]
Restructuring costs, gross	$257	$1,224	$3,643
Cash payments	-281	-789	-978
Non-cash charges		-82
Change in estimate	-67	-70
Ending balance	2,857	2,948	2,665
One-Time Termination Benefits [Member]
Reorganization Items [Line Items]
Restructuring costs, gross		565	598
Cash payments	-41	-591	-329
Non-cash charges		-82
Change in estimate		-25
Ending balance	95	136	269
Contract Termination [Member]
Reorganization Items [Line Items]
Restructuring costs, gross		614	2,168
Cash payments	-150	-6
Ending balance	2,626	2,776	2,168
Other Associated Costs [Member]
Reorganization Items [Line Items]
Restructuring costs, gross	257	45	877
Cash payments	-90	-192	-649
Change in estimate	-67	-45
Ending balance	$136	$36	$228

SelfInsurance_Additional_Infor

Self-Insurance - Additional Information (Detail) (USD $)	12 Months Ended
Self-Insurance - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Insurance [Abstract]
Maximum amount of individual claim under self insurance plan	$100,000
Percentage of cumulative medical claim under self insurance plan	125.00%
Liability for self-insured claims included in accrued compensation and benefits	$707,000	$225,000

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Release of valuation allowance	$7,900,000		$7,923,000
Valuation allowance		46,191,000	20,995,000
Increase in valuation allowance		25,200,000
Interest and penalties related to uncertain tax positions		0
Tax positions expected to increase or decrease within next 12 months		0
State enterprise zone credits [Member]
Income Tax Contingency [Line Items]
Tax credits carryforwards		1,300,000
Federal [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards		192,200,000
Net operating loss carryforwards expiration year		2025
Net operating loss related to windfall tax benefit		59,000,000
Federal [Member] \| Research credit [Member]
Income Tax Contingency [Line Items]
Tax credits carryforwards		6,600,000	2,900,000
Federal tax credits carryforwards expiration		2025
State [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards		152,500,000
Net operating loss carryforwards expiration year		2015
Net operating loss related to windfall tax benefit		45,700,000
State [Member] \| Research credit [Member]
Income Tax Contingency [Line Items]
Tax credits carryforwards		$5,700,000	$2,500,000

Income_Taxes_Components_of_Pro

Income Taxes - Components of Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
State	$427	$412	$67
Deferred:
Federal		-5,123
State		-2,800
Income tax expense	$427	($7,511)	$67

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Actual Tax Rate (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	($26,430)	($8,592)
Permanent items	244	128
State taxes	-844	-499
Net operating loss not benefitted	21,110	8,004
Acquisition related costs	6,216	1,072
Valuation allowance release		-7,923
Stock-based compensation	131	299
Income tax expense	$427	($7,511)	$67

Income_Taxes_Reconciliation_of1

Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Actual Tax Rate (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	35.00%	34.00%

Income_Taxes_Deferred_Tax_Asse

Income Taxes - Deferred Tax Assets and Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Net operating loss carryforwards	$50,824	$40,828
Tax credit carryforwards	8,371	5,210
Accruals and reserves	8,337	5,082
Stock-based compensation	10,891	9,034
Other	16	27
Gross deferred tax assets	78,439	60,181
Valuation allowance	-46,191	-20,995
Total deferred tax assets	32,248	39,186
Liabilities:
Deferred Revenue		-58
Prepaid expenses and other	-1,097	-1,085
Fixed assets and intangibles	-31,151	-38,043
Total deferred tax liabilities	-32,248	-39,186
Net deferred tax assets	$0	$0

Income_Taxes_Schedule_of_Net_D

Income Taxes - Schedule of Net Deferred Tax Assets and Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current deferred tax assets	$1,206	$3,038
Non-current deferred tax assets		2,525
Non-current deferred tax liabilities	-1,206	-5,563
Net deferred tax assets	$0	$0

Income_Taxes_Reconciliation_of2

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Balance at the beginning of the year	$2,336	$20	$475
Increases (decreases) related to prior year tax positions	1,253		-475
Current year increases	3,113	2,316	20
Balance at the end of the year	$6,702	$2,336	$20

Employee_Benefit_Plan_Addition

Employee Benefit Plan - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Company's contribution based on employee contribution	4.00%
Company's expense related to its benefit plan	$2.90	$1.10

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended	0 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2014	Feb. 17, 2015	Dec. 31, 2013	Aug. 20, 2013	Jul. 28, 2014
	Employees	Dec. 31, 2014	Employees	Dec. 31, 2013	Aug. 20, 2013	Jul. 28, 2014
Subsequent Event [Line Items]
Common stock conversion ratio					0.1553
Common stock, par value		$0.00		$0.00
Expected workforce reduction	83
Restructuring charges		$4,987
Zebra Hold Co Inc. [Member] \| Common Class A [Member]
Subsequent Event [Line Items]
Common stock conversion ratio						0.444
Number votes per common stock		One vote
Zebra Hold Co Inc. [Member] \| Common Class B [Member]
Subsequent Event [Line Items]
Number votes per common stock		Ten votes
Common stock, par value						0.0001
Zillow Group Inc. [Member]
Subsequent Event [Line Items]
Acquisition completion date		17-Feb-15
Restructuring completion date		31-Dec-15
Severance cost, description		Severance payments will be paid out by the end of 2015.
Zillow Group Inc. [Member] \| Common Class B [Member]
Subsequent Event [Line Items]
Common stock, par value						0.0001
Zillow Group Inc. [Member] \| Zebra Hold Co Inc. [Member] \| Common Class A [Member]
Subsequent Event [Line Items]
Common stock conversion ratio						1
Common stock, par value						0.0001
Zillow Group Inc. [Member] \| Zebra Hold Co Inc. [Member] \| Common Class B [Member]
Subsequent Event [Line Items]
Common stock conversion ratio						1
Zillow Group Inc. [Member] \| Subsequent Events [Member]
Subsequent Event [Line Items]
Expected workforce reduction			342
Expected percentage of workforce reduction			32.00%
Zillow Group Inc. [Member] \| Subsequent Events [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Restructuring charges			21,500
Zillow Group Inc. [Member] \| Subsequent Events [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Restructuring charges			24,500

Valuation_and_Qualifying_Accou1

Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract]
Beginning balance	$411	$142	$80
Charged to costs and expenses	-135	351	95
Reductions and write-offs	-190	-82	-33
Ending balance	$86	$411	$142