Trulia (TRLA) 10-Q 2 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 21, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Trading Symbol	'TRLA	'
Entity Registrant Name	'TRULIA, INC.	'
Entity Central Index Key	'0001349454	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	36,924,431

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
CURRENT ASSETS:	'	'
Cash and cash equivalents	$220,755	$225,597
Accounts receivable, net of allowance for doubtful accounts of $53 and $411 as of March 31, 2014 and December 31, 2013, respectively	11,230	11,697
Prepaid expenses and other current assets	8,190	12,272
Total current assets	240,175	249,566
Restricted cash	6,412	1,589
Property and equipment, net	25,999	22,289
Intangible assets	114,073	117,888
Goodwill	255,904	255,904
Other assets	8,430	8,173
TOTAL ASSETS	650,993	655,409
CURRENT LIABILITIES:	'	'
Accounts payable	1,778	3,018
Accrued liabilities	11,155	11,261
Accrued compensation and benefits	8,498	10,863
Deferred revenue	10,962	10,002
Deferred rent, current portion	924	1,035
Capital lease liability, current portion	28	51
Total current liabilities	33,345	36,230
Deferred rent, net of current portion	5,125	4,751
Capital lease liability, net of current portion	80	84
Long-term debt	230,000	230,000
Other long-term liabilities	3,439	3,268
TOTAL LIABILITIES	271,989	274,333
Commitments and contingencies (NOTE 7)	'	'
STOCKHOLDERS' EQUITY:	'	'
Preferred stock, par value of $0.00001, 20,000,000 shares authorized as of March 31, 2014 and December 31, 2013; no shares issued or outstanding as of March 31, 2014 and December 31, 2013	'	'
Common stock, par value of $0.00001, 1,000,000,000 shares authorized as of March 31, 2014 and December 31, 2013; 38,003,181 and 37,668,476 shares issued as of March 31, 2014 and December 31, 2013, respectively; 36,917,277 and 36,582,572 shares outstanding as of March 31, 2014 and December 31, 2013, respectively;	'	'
Treasury stock at $27.65, 1,085,904 shares as of March 31, 2014 and December 31, 2013, respectively	'	'
Additional paid-in capital	459,039	445,960
Accumulated deficit	-80,035	-64,884
TOTAL STOCKHOLDERS' EQUITY	379,004	381,076
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$650,993	$655,409

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Allowance for doubtful accounts	$53	$411
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	38,003,181	37,668,476
Common stock, shares outstanding	36,917,277	36,582,572
Treasury stock, per share	$27.65	$27.65
Treasury stock, shares	1,085,904	1,085,904
Preferred stock [Member]	'	'
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

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]	'	'
Revenue	$54,489	$24,002
Cost and operating expenses:	'	'
Cost of revenue (exclusive of amortization of product development cost)	10,097	3,181
Technology and development	12,625	4,897
Sales and marketing	33,144	12,293
General and administrative	11,994	5,172
Total cost and operating expenses	67,860	25,543
Loss from operations	-13,371	-1,541
Interest income	145	26
Interest expense	-1,827	-236
Loss before provision for income taxes	-15,053	-1,751
Provision for income taxes	-98	-231
Net loss attributable to common stockholders	($15,151)	($1,982)
Net loss per share attributable to common stockholders, basic and diluted	($0.41)	($0.07)
Weighted average shares used in computing net loss per share attributable to common stockholders, basic and diluted	36,726,178	28,427,025

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:	'	'
Net income (loss)	($15,151)	($1,982)
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Depreciation and amortization	6,256	1,360
Compensation paid in stock	9,888	1,392
Provision for doubtful accounts	-221	22
Loss on disposal of fixed assets	5	'
Amortization of debt discount	'	35
Amortization of debt issue cost	24	7
Amortization of underwriters fees	221	'
Changes in operating assets and liabilities:	'	'
Accounts receivable	688	-1,377
Prepaid expenses and other current assets	4,082	-173
Other assets	-502	'
Accounts payable	-829	42
Accrued liabilities	2,655	354
Accrued compensation and benefits	159	78
Deferred rent	263	18
Deferred revenue	960	1,518
Other long-term liabilities	57	'
Net cash provided by operating activities	8,555	1,294
CASH FLOWS FROM INVESTING ACTIVITIES:	'	'
(Increase) decrease in restricted cash and deposits	-4,823	248
Purchases of property and equipment	-8,894	-2,423
Net cash used in investing activities	-13,717	-2,175
CASH FLOWS FROM FINANCING ACTIVITIES:	'	'
Proceeds from the follow-on public offering, net of underwriting discounts	'	114,056
Payments of costs related to follow-on public offering	'	-65
Repayments on capital lease liability	-27	-87
Proceeds from exercise of stock options	1,721	1,296
Value of equity awards withheld for tax liabilities	-1,374	'
Net cash provided by financing activities	320	115,200
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-4,842	114,319
CASH AND CASH EQUIVALENTS-Beginning of period	225,597	100,017
CASH AND CASH EQUIVALENTS-End of period	220,755	214,336
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:	'	'
Cash paid for interest	'	191
Cash paid for income taxes	167	231
NON-CASH INVESTING AND FINANCING ACTIVITIES:	'	'
Unpaid deferred IPO/follow-on offering costs	'	1,024
Compensation paid in stock capitalized in product development costs	434	113
Net change related to purchase of equipment in accounts payable and accrued liabilities	-3,172	-7
Purchases of equipment with accounts payable and accrued liabilities at period end	792	256
Number of common warrants exercised in a net settlement transaction	'	$56,054

Organization_and_Description_o

Organization and Description of Business	3 Months Ended
	Mar. 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 online marketplace and mobile applications help consumers research homes and neighborhoods and provide a broad array of information to help them in the buying and selling processes. We also help real estate professionals market themselves and their listings. Our subscription-based real estate marketing and software products provide real estate professionals with access to transaction-ready consumers and help them grow and manage their businesses.
	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 (the “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 Merger Agreement.
	Convertible Senior Notes
	On December 17, 2013, we issued $230.0 million aggregate principal amount of 2.75% Convertible Senior Notes, due in 2020 (the “2020 Notes”), which included a $30 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 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, subject to adjustment in certain events. Further detail on these 2020 Notes is presented in Note 6 of these condensed consolidated financial statements.
	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	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	2	Summary of Significant Accounting Policies
	Basis of Presentation
	Our unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Accordingly, these interim condensed consolidated financial statements should be read in conjunction with the audited financial statements and accompanying notes as of and for the fiscal year ended December 31, 2013 included in our Annual Report on Form 10-K, which was filed with the SEC on March 3, 2014. The condensed consolidated balance sheet as of December 31, 2013, included herein, was derived from the audited financial statements as of that date.
	The unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements and, in our opinion, reflect all adjustments, consisting only of normal recurring adjustments, necessary to present fairly our financial position as of March 31, 2014, our results of operations and cash flows for the three months ended March 31, 2014 and 2013. The results for the three month period ended March 31, 2014 are not necessarily indicative of the results to be expected for the year ended December 31, 2014, or for any other interim period, or for any other future year.
	Principles of Consolidation
	The unaudited 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 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; allowance for doubtful accounts; useful lives of property and equipment and intangible assets; recoverability of long-lived assets, intangible assets with definite lives and goodwill; income tax uncertainties, including a valuation allowance for deferred tax assets; accounting for business combinations; 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.
	Significant Accounting Policies
	There have been no changes to our significant accounting policies described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2013.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 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 approximated their fair values. The estimated fair value and carrying value of our 2020 Notes as of March 31, 2014 was $236.8 million and $230.0 million, respectively. We determined the estimated fair value of the 2020 Notes through use of option pricing and discounted cash flow models. 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. The estimated fair value and carrying value of our 2020 Notes as of December 31, 2013 was $252.0 million and $230.0 million, respectively. The following table sets forth the fair value of our financial assets remeasured on a recurring basis, by level within the fair value hierarchy (in thousands):
			As of March 31, 2014
			Level I		Level II		Level III		Total
	Financial Assets:
	Money market funds		$	6,683	$	—	$	—	$	6,683
	Restricted cash			6,412		—		—		6,412
	Total financial assets		$	13,095	$	—	$	—	$	13,095
			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 three months ended March 31, 2014 and 2013. There were no other-than-temporary impairments for these instruments as of March 31, 2014 and December 31, 2013. In the three months ended March 31, 2014 our restricted cash increased by $4.8 million, of which $3.8 million was in connection with our new lease agreement in San Francisco discussed further in Note 7, and $968,000 related to the amendment of our continuing lease agreement in Denver. As of March 31, 2014, the contractual maturities of all certificates of deposit were from less than one year to three years.
	Our cash equivalents include all credit card and debit card transactions that process as of the last day of each month and settle within a few days of the beginning of the subsequent month. The amounts due from third party merchant processors for these transactions that are included in our cash equivalents totaled $336,000 and $349,000 as of March 31, 2014 and December 31, 2013, respectively.

Property_and_Equipment_net

Property and Equipment, net	3 Months Ended
	Mar. 31, 2014
Property Plant And Equipment [Abstract]	'
Property and Equipment, net	'
	4	Property and Equipment, net
	Property and equipment consisted of the following (in thousands):
			As of March 31,			As of December 31,
			2014			2013
	Computer equipment		$	7,887		$	7,275
	Capitalized product development costs			12,416			9,934
	Furniture and fixtures			3,802			3,276
	Leasehold improvements			9,852			8,985
	Software			1,052			183
	Equipment not yet in service			4,565			3,868
	Total property and equipment			39,574			33,521
	Less: accumulated depreciation and amortization			(13,575	)		(11,232	)
	Total property and equipment, net		$	25,999		$	22,289
	As of March 31, 2014 and December 31, 2013, property and equipment under capital lease, included within the computer equipment balance above, amounted to $131,000 and $261,000, respectively, with accumulated depreciation of $23,000 and $87,000, respectively. Depreciation expense for the three months ended March 31, 2014 and 2013 was $2.4 million and $1.4 million, respectively.
	We capitalized costs associated with product development of $3.8 million and $1.6 million during the three months ended March 31, 2014 and 2013, respectively. Amortization expense for product development costs included in the technology and development expenses during the three months ended March 31, 2014 and 2013 was $1.2 million and $199,000, respectively.

Intangible_Assets

Intangible Assets	3 Months Ended
	Mar. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]	'
Intangible Assets	'
	5	Intangible Assets
	As noted in Note 1 above, 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, for a total purchase price of $372.7 million. The total purchase price was allocated to the preliminary net tangible and intangible assets based on their preliminary fair values as of August 20, 2013. The excess of the purchase price over the preliminary net tangible assets and intangibles assets was recorded as goodwill. The total value allocated to the intangible assets was $123.1 million.
	The following tables present the detail of intangible assets subject to amortization (in thousands):
			Three Months Ended March 31, 2014
			Gross		Accumulated			Net
					Amortization
	Enterprise relationships		$	29,000	$	(1,777	)	$	27,223
	Premium users			15,200		(1,863	)		13,337
	Existing technology			32,300		(2,828	)		29,472
	Trade names			42,900		(2,629	)		40,271
	Home/MLS data feeds			3,700		(227	)		3,473
	Other			785		(488	)		297
	Total		$	123,885	$	(9,812	)	$	114,073
			Year Ended December 31, 2013
			Gross		Accumulated			Net
					Amortization
	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 for the three months ended March 31, 2014 and 2013 was $3.9 million and $56,000, respectively.
	Future amortization expense is expected to be as follows over each of the next five years (in thousands):
			Total
	2014 (remaining nine months)		$	11,701
	2015			15,222
	2016			15,214
	2017			15,214
	2018			14,111
	Thereafter			42,611
	Total		$	114,073

Debt

Debt	3 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
Debt	'
	6	Debt
	As discussed in Notes 1 and 3, on December 17, 2013 we issued $230.0 million aggregate principal amount of the 2020 Notes, which included a $30 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. The estimated fair value and carrying value of the 2020 Notes as of March 31, 2014 were $236.8 million and $230.0 million, respectively.
	The conversion option of the 2020 Notes has no cash settlement provisions. Total issuance costs for the convertible 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.
	We recognized interest expense related to the 2020 Notes in the three months ended March 31, 2014 and in the period from December 17, 2013 through December 31, 2013 of $1.8 million and $246,000, respectively. The amortization of debt issuance costs related to the 2020 Notes in the three months ended March 31, 2014 and in the period from December 17, 2013 through December 31, 2013 was $245,000 and $38,000, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	7	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 (“the Lease”) for 52,595 square feet of office space at 535 Mission Street in San Francisco. The term of the Lease is approximately 107 months and is scheduled to commence on November 1, 2014, or the date that the landlord substantially completes the construction of our new facility. We will also obtain the right to occupy an additional 26,682 square feet of office space commencing in October 2015. Furthermore, we have options to lease up to an aggregate of approximately 40,000 square feet of additional office space under the Lease. Future minimum lease payments under the Lease will range from $182,000 per month to $347,000 per month. Once we occupy this office space, it will become our new principal executive office and will replace 116 New Montgomery Street in San Francisco. To secure our lease obligation we were required to enter into a secured letter of credit arrangement with a financial institution for the amount of $3.8 million. This deposit is classified as restricted cash in our balance sheet as of March 31, 2014.
	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 was $1.1 million and $727,000 for the three months ended March 31, 2014 and 2013, respectively.
	As of March 31, 2014, our minimum payments under the noncancelable operating leases were as follows (in thousands):
	Year Ending December 31:		Operating Lease
	2014 (remaining nine months)		$	2,689
	2015			6,201
	2016			5,900
	2017			6,044
	2018			6,222
	Thereafter			26,260
	Total minimum lease payments		$	53,316
	Contingencies
	Merger Litigation
	Following the announcement that we entered into an Agreement and Plan of Merger to acquire Market Leader, purported class action law suits brought on behalf of all Market Leader shareholders contesting the merger were filed in King County Superior Court and then consolidated under the caption In re Market Leader Inc. Shareholders’ Litigation, No. 13-2-20796-6 SEA (the “Merger Litigation”). On July 15, 2013, a superseding Consolidated Class Action Complaint (“Consolidated Complaint”), was filed, alleging that Market Leader’s board of directors breached its fiduciary duties by failing to maximize shareholder value or to engage in a fair sale process before approving the proposed acquisition of Market Leader by Trulia. The Consolidated Complaint also alleged that the defendants, including us and Mariner Acquisition Corp., our wholly owned subsidiary, failed to provide Market Leader shareholders with material information regarding the merger in the proxy statement and related public filings. The Consolidated Complaint further alleged that Market Leader, Trulia, and Mariner Acquisition Corp. aided and abetted the Market Leader directors’ breaches of fiduciary duty. The Consolidated Complaint sought an injunction prohibiting the consummation of the merger, rescission to the extent the merger terms have already been implemented, damages for the alleged breaches of fiduciary duty, and payment of plaintiffs’ attorneys’ fees and costs. On August 5, 2013, the parties entered into a memorandum of understanding to settle the Merger Litigation and resolve all allegations against Market Leader and the other defendants. The settlement provided for the release of all claims against the defendants relating to the merger, including those alleged in the Consolidated Complaint. Lead counsel for the consolidated action applied to the court for an award of fees and reimbursement of costs incurred in connection with the Merger Litigation. Market Leader agreed not to oppose the application for an award of fees and reimbursement of costs up to $350,000. On December 23, 2013, the court entered an order preliminarily approving the settlement, and on March 7, 2014, a final order approving the settlement was issued.
	Zillow Litigation
	In September 2012, Zillow, Inc. (“Zillow”) filed a lawsuit against us alleging patent infringement of US patent 7,970,674 (the “’764 Patent”). Zillow is seeking a permanent injunction against the alleged infringement, compensatory damages, and attorneys’ fees. We believe we have meritorious defenses and we intend to vigorously defend the claims against us. On September 11, 2013, we filed a petition for covered business method patent review with the United States Patent and Trademark Office (“PTO”). Also, on September 12, 2013, we filed a motion to stay pending the review. The district court granted our motion to stay on October 7, 2013, and this matter is now stayed. On March 10, 2014, the PTO granted our petition and instituted the covered business method patent review. Separately, on March 27, 2014, the PTO ruled in an inter partes review proceeding brought by a different company that the majority of the claims of the ‘764 Patent were invalid. This litigation is still in its early stages and the final outcome, including any estimated liability, if any, with respect to these claims, is uncertain. We did not accrue any amounts related to this litigation because a reasonably possible range of loss, if any, that may result from this matter could not be estimated as of March 31, 2014 and December 31, 2013.
	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 our 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 March 31, 2014 and December 31, 2013.

Stockholders_Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]	'
Stockholders' Equity	'
	8	Stockholders’ Equity
	Common Stock
	As of March 31, 2014 and December 31, 2013, we had reserved shares of our common stock for issuance as follows:
			As of March 31,		As of December 31,
			2014		2013
	Stock options and awards issued and outstanding			6,687,067		6,452,832
	Stock options and awards available for grant under 2012 Plan			2,885,250		1,976,815
	Stock options and awards available for grant under the 2004 Plan			274,318		82,784
	Total			9,846,635		8,512,431

Compensation_Paid_in_Stock

Compensation Paid in Stock	3 Months Ended
	Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Compensation Paid in Stock	'
	9	Compensation paid in stock
	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, RSAs, RSUs, 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, 2014 and 2013 the shares available for grant under the 2012 Plan were automatically increased by 1,463,303 and 1,102,112 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 RSUs are granted for zero purchase price.
	Market Leader 2004 Equity Incentive Plan
	In connection with our acquisition of Market Leader and pursuant to the Merger Agreement between us and Market Leader, we assumed Market Leader’s 2004 Equity Incentive Plan (“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 may make equity-based awards, to the extent permissible by applicable law and NYSE rules, under the terms of the 2004 Plan to issue the reserved but unissued shares under the 2004 Plan and the shares that would otherwise be returned to the 2004 Plan due to (i) awards that lapse, expire, terminate, or are canceled prior to the issuance of shares thereunder or (ii) shares of common stock that are issued under the 2004 Plan and thereafter are forfeited to or otherwise reacquired by us.
	As of the date we assumed the 2004 Plan, a total of 283,522 shares of common stock were available for issuance. The shares available were increased on January 1, 2014 by 202,770 shares under the automatic annual increase provisions of the 2004 Plan.
	We did not assume House Value’s 1999 Stock Incentive Plan (the “1999 Plan”). However, pursuant to the 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 will continue to be outstanding and will be governed by the provisions of the 1999 Plan.
	The total shares of common stock available for grant under our 2012 Plan and 2004 Plan were 3,159,568 and 2,059,599 as of March 31, 2014 and December 31, 2013, respectively.
	Stock Option Activity
	Stock option activity for the three months ended March 31, 2014 under the 2005 Plan, 2012 Plan, 1999 Plan, and 2004 Plan was as follows:
			Stock			Weighted		Weighted		Aggregate
			Options			Average		Average		Intrinsic
			Outstanding			Exercise Price		Remaining		Value
								Contractual
								Life (Years)
										(In thousands)
	Balance—January1, 2014			3,088,449		$	13.9		7.42	$	68,131
	Granted			131,080			32.65
	Canceled			(44,601	)		11.17
	Exercised			(206,006	)		8.17
	Balance—March 31, 2014			2,968,922		$	15.16		7.42	$	56,428
	Options exercisable—March 31, 2014			1,473,977		$	9.94		6.36	$	35,458
	Options vested and expected to vest—March 31, 2014			2,884,299		$	14.91		7.38	$	55,522
	The options exercisable as of March 31, 2014 included options that were exercisable prior to vesting. The weighted average grant date fair value of options granted during the three months ended March 31, 2014 and 2013 was $14.87 and $12.63, 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 $4.9 million and $11.4 million, for the three months ended March 31, 2014 and 2013, respectively.
	The total estimated grant date fair value of employee options vested during the three months ended March 31, 2014 and 2013 was $2.1 million and $756,000, respectively. As of March 31, 2014, total unrecognized compensation cost related to non-vested stock options granted to employees was $12.6 million, net of estimated forfeitures of $1.3 million. These costs will be amortized on a straight-line basis over a weighted average vesting period of 2.38 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			597,083			30.7
	Canceled			(51,856	)		35.19
	Released			(173,206	)		31.6
	Unvested—March 31, 2014			2,032,610		$	27.22		1.9	$	67,483
	Restricted stock units expected to vest—March 31, 2014			1,798,404		$	34.29		1.82	$	59,707
	As of March 31, 2014 total unrecognized compensation cost related to the unvested RSUs granted to employees was $51.0 million, net of estimated forfeitures of $5.7 million, respectively. This cost will be amortized on a straight-line basis over a weighted average vesting period of 3.02 years.
	In the three months ended June 30, 2013 and September 30, 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 and 528,750 were time based awards. The performance based awards were contingent upon closing of the acquisition of Market Leader referred to in Note 1 above, 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 acquisition of Market Leader referred to in Note 1 above 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 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—December 31, 2013			1,576,250		$	22.84		3	$	55,594
	Granted			—
	Canceled			(15,000	)
	Released			—
	Unvested—March 31, 2014			1,561,250		$	22.89		2.76	$	51,834
	Restricted stock units expected to vest—March 31, 2014			1,484,567		$	22.92		2.75	$	49,288
	We estimated the fair value of the performance based awards with market-based conditions using a Monte Carlo simulation model. Total compensation cost recorded related to performance-based awards in the three months ended March 31, 2014 was $2.8 million.
	As of March 31, 2014 total unrecognized compensation cost related to the unvested performance based awards was $27.3 million, net of estimated forfeitures of $1.4 million, respectively. This cost will be amortized on a straight-line basis over a weighted average vesting period of 2.76 years.
	Summary of Assumptions
	The fair value of employee stock option awards was estimated on the date of grant using the Black-Scholes options pricing model with the following weighted average assumptions:
			Three Months Ended March 31,
			2014		2013
	Expected term (in years)		5.4		5.4
	Expected volatility		49%		52%
Risk-free interest rate		1.7%		0.9%
Dividend rate		0%		0%
The fair value of performance based awards with market based condition was estimated using the Monte Carlo simulation model with the following weighted average assumptions:
		As of May 29,		As of 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		52.60%		52.60%
Dividend yield		0%		0%
Cost of equity		12.60%		12.30%
Stock Appreciation Rights Activity
We measure the fair value of stock appreciation rights similar to stock options. Additionally, we classify stock appreciation rights that may be settled in cash as a liability and remeasure it at fair value at the end of each reporting period. Any changes in fair value as a result of this remeasurement are recorded as cumulative compensation cost. Compensation expense related to stock appreciation rights is recognized over the vesting period using the straight-line method reduced for estimated forfeitures. We recognized $114,000 as compensation expense in the three months ended March 31, 2014 related to the stock appreciation rights. Stock appreciation rights activity is summarized in the following table:
		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			(3,259	)		—
Exercised			—			—
Balance—March 31, 2014			124,285		$	11.72		2.83	$	2,670
Exercisable—March 31, 2014			39,548		$	11.18		2.78	$	871
Vested and expected to vest—March 31, 2014			116,828		$	11.66		2.82	$	2,516
The aggregate intrinsic value of stock appreciation rights exercised was $1.1 million for the three months ended March 31, 2014. The total estimated grant date fair value of employee stock appreciation rights vested during the three months ended March 31, 2014 was $412,000. As of March 31, 2014 total unrecognized compensation cost related to non-vested stock appreciation rights granted to employees was $2.2 million, net of estimated forfeitures of $82,000. These costs will be amortized on a straight-line basis over a weighted average vesting period of 1.71 years.
There were no stock appreciation rights issued or outstanding in the three months ended March 31, 2013.
The value of each employee stock appreciation right was estimated at the end of the reporting period using the Black-Scholes options pricing model with the following weighted average assumptions:
		Three Months
		Ended March 31,
		2014
Estimated term (in years)		1.41
Risk-free interest rate		0.29%
Expected volatility		35%
Expected dividend yield		0%
Our stock appreciation rights typically vest on a graded basis over either a two or four year period and typically expire the earlier of five years from the date of grant or ninety days following termination of employment.
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):
		Three Months Ended March 31,
		2014			2013
Compensation paid in stock related to vesting of stock based awards:
Cost of revenue		$	426		$	41
Technology and development			1,844			411
Sales and marketing			3,493			337
General and administrative			4,125			603
Total compensation paid in stock			9,888			1,392
Other compensation paid in stock			—			—
Total compensation paid in stock		$	9,888		$	1,392
We capitalized compensation paid in stock of $295,000 and $113,000 as product development costs during the three months ended March 31, 2014 and 2013, respectively.

Net_Loss_per_Share_Attributabl

Net Loss per Share Attributable to Common Stockholders	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Net Loss per Share Attributable to Common Stockholders	'
	10	Net Loss per Share Attributable to Common Stockholders
	The following table sets forth the computation of our basic and diluted net income (loss) per share attributable to common stockholders during the three months ended March 31, 2014 and 2013 (in thousands, except share and per share data):
			Three Months Ended
			March 31,
			2014			2013
	Net loss attributable to common stockholders		$	(15,151	)	$	(1,982	)
	Weighted average shares used in computing basic and diluted net loss per share			36,726,178			28,427,025
	Net loss per share attributable to common stockholders, basic and diluted		$	(0.41	)	$	(0.07	)
	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:
			Three Months Ended March 31,
			2014			2013
	Stock options to purchase common stock			2,968,922			3,417,752
	Restricted stock units			3,593,860			552,008
	Stock appreciation rights			124,285			—
	Heldback shares in connection with Movity acquisition			30,524			30,524
	Convertible senior notes			6,400,969			—

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	11	Income Taxes
	We account for income taxes in accordance with authoritative guidance, which requires 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 statements 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.

Employee_Benefit_Plan

Employee Benefit Plan	3 Months Ended
	Mar. 31, 2014
Postemployment Benefits [Abstract]	'
Employee Benefit Plan	'
	12	Employee Benefit Plan
	We have a defined contribution 401(k) retirement plan covering Trulia employees who have met certain eligibility requirements (the “Trulia 401(k) Plan”). Eligible employees may contribute pretax compensation up to the maximum amount allowable under Internal Revenue Service limitations. Employee contributions and earnings thereon vest immediately.
	Effective with the Market Leader acquisition, we assumed the Market Leader defined contribution 401(k) plan separately covering our Market Leader employees (the “Market Leader 401(k) Plan”). Eligible employees may contribute pretax compensation up to the maximum amount allowable under 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 during the three months ended March 31, 2014 and 2013 was $592,000 and $264,000, respectively. The Market Leader 401(k) Plan allows for discretionary employer contributions, but no such contributions have been made.

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	13	Subsequent Events
	On April 10, 2014, we entered into a lease agreement for 64,908 square feet of office space in the Denver metropolitan area. The term of the lease is approximately 90 calendar months and is scheduled to commence on May 1, 2014. The lease agreement calls for escalating rent payments over the 90 calendar months and allows for six full months of rent abatement. Future minimum lease payments range from $124,000 per month to $141,000 per month. In connection with this lease agreement we entered into a secured letter of credit arrangement with a financial institution for the amount of $1.1 million to secure our lease obligation. This deposit is classified as restricted cash in our balance sheet as of March 31, 2014.
	Effective April 1, 2014, we merged our existing defined contribution 401(k) retirement plans into one plan with a single financial institution. The new plan covers all our employees who have met certain eligibility requirements. Eligible employees may contribute pretax compensation up to the maximum amount allowable under Internal Revenue Service limitations. Employee contributions and earnings thereon vest immediately.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	Our unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Accordingly, these interim condensed consolidated financial statements should be read in conjunction with the audited financial statements and accompanying notes as of and for the fiscal year ended December 31, 2013 included in our Annual Report on Form 10-K, which was filed with the SEC on March 3, 2014. The condensed consolidated balance sheet as of December 31, 2013, included herein, was derived from the audited financial statements as of that date.
	The unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements and, in our opinion, reflect all adjustments, consisting only of normal recurring adjustments, necessary to present fairly our financial position as of March 31, 2014, our results of operations and cash flows for the three months ended March 31, 2014 and 2013. The results for the three month period ended March 31, 2014 are not necessarily indicative of the results to be expected for the year ended December 31, 2014, or for any other interim period, or for any other future year.
Principles of Consolidation	'
	Principles of Consolidation
	The unaudited 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 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; allowance for doubtful accounts; useful lives of property and equipment and intangible assets; recoverability of long-lived assets, intangible assets with definite lives and goodwill; income tax uncertainties, including a valuation allowance for deferred tax assets; accounting for business combinations; 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.
Significant Accounting Policies	'
	Significant Accounting Policies
	There have been no changes to our significant accounting policies described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2013.
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.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Schedule of Fair Value of Financial Assets Remeasured on Recurring Basis	'
	The following table sets forth the fair value of our financial assets remeasured on a recurring basis, by level within the fair value hierarchy (in thousands):
		As of March 31, 2014
		Level I		Level II		Level III		Total
	Financial Assets:
	Money market funds	$	6,683	$	—	$	—	$	6,683
	Restricted cash		6,412		—		—		6,412
	Total financial assets	$	13,095	$	—	$	—	$	13,095
		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

Property_and_Equipment_net_Tab

Property and Equipment, net (Tables)	3 Months Ended
	Mar. 31, 2014
Property Plant And Equipment [Abstract]	'
Property and Equipment	'
	Property and equipment consisted of the following (in thousands):
		As of March 31,			As of December 31,
		2014			2013
	Computer equipment	$	7,887		$	7,275
	Capitalized product development costs		12,416			9,934
	Furniture and fixtures		3,802			3,276
	Leasehold improvements		9,852			8,985
	Software		1,052			183
	Equipment not yet in service		4,565			3,868
	Total property and equipment		39,574			33,521
	Less: accumulated depreciation and amortization		(13,575	)		(11,232	)
	Total property and equipment, net	$	25,999		$	22,289

Intangible_Assets_Tables

Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]	'
Schedule of Intangible Assets Subject to Amortization	'
	The following tables present the detail of intangible assets subject to amortization (in thousands):
		Three Months Ended March 31, 2014
		Gross		Accumulated			Net
				Amortization
	Enterprise relationships	$	29,000	$	(1,777	)	$	27,223
	Premium users		15,200		(1,863	)		13,337
	Existing technology		32,300		(2,828	)		29,472
	Trade names		42,900		(2,629	)		40,271
	Home/MLS data feeds		3,700		(227	)		3,473
	Other		785		(488	)		297
	Total	$	123,885	$	(9,812	)	$	114,073
		Year Ended December 31, 2013
		Gross		Accumulated			Net
				Amortization
	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
	2014 (remaining nine months)	$	11,701
	2015		15,222
	2016		15,214
	2017		15,214
	2018		14,111
	Thereafter		42,611
	Total	$	114,073

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Schedule of Minimum Payments under Noncancelable Operating Leases	'
	As of March 31, 2014, our minimum payments under the noncancelable operating leases were as follows (in thousands):
	Year Ending December 31:	Operating Lease
	2014 (remaining nine months)	$	2,689
	2015		6,201
	2016		5,900
	2017		6,044
	2018		6,222
	Thereafter		26,260
	Total minimum lease payments	$	53,316

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]	'
Summary of Common Stock Reserved	'
	Common Stock
	As of March 31, 2014 and December 31, 2013, we had reserved shares of our common stock for issuance as follows:
		As of March 31,		As of December 31,
		2014		2013
	Stock options and awards issued and outstanding		6,687,067		6,452,832
	Stock options and awards available for grant under 2012 Plan		2,885,250		1,976,815
	Stock options and awards available for grant under the 2004 Plan		274,318		82,784
	Total		9,846,635		8,512,431

Compensation_Paid_in_Stock_Tab

Compensation Paid in Stock (Tables)	3 Months Ended
	Mar. 31, 2014
Stock Option Activity under 2005 Plan, 2012 Plan, 1999 Plan and 2004 Plan	'
	Stock option activity for the three months ended March 31, 2014 under the 2005 Plan, 2012 Plan, 1999 Plan, and 2004 Plan was as follows:
		Stock			Weighted		Weighted		Aggregate
		Options			Average		Average		Intrinsic
		Outstanding			Exercise Price		Remaining		Value
							Contractual
							Life (Years)
									(In thousands)
	Balance—January1, 2014		3,088,449		$	13.9		7.42	$	68,131
	Granted		131,080			32.65
	Canceled		(44,601	)		11.17
	Exercised		(206,006	)		8.17
	Balance—March 31, 2014		2,968,922		$	15.16		7.42	$	56,428
	Options exercisable—March 31, 2014		1,473,977		$	9.94		6.36	$	35,458
	Options vested and expected to vest—March 31, 2014		2,884,299		$	14.91		7.38	$	55,522
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		597,083			30.7
	Canceled		(51,856	)		35.19
	Released		(173,206	)		31.6
	Unvested—March 31, 2014		2,032,610		$	27.22		1.9	$	67,483
	Restricted stock units expected to vest—March 31, 2014		1,798,404		$	34.29		1.82	$	59,707
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—December 31, 2013		1,576,250		$	22.84		3	$	55,594
	Granted		—
	Canceled		(15,000	)
	Released		—
	Unvested—March 31, 2014		1,561,250		$	22.89		2.76	$	51,834
	Restricted stock units expected to vest—March 31, 2014		1,484,567		$	22.92		2.75	$	49,288
Assumptions Used to Estimate Fair Value of Each Employee Stock Option Awards	'
	The fair value of employee stock option awards was estimated on the date of grant using the Black-Scholes options pricing model with the following weighted average assumptions:
		Three Months Ended March 31,
		2014		2013
	Expected term (in years)	5.4		5.4
	Expected volatility	49%		52%
	Risk-free interest rate	1.7%		0.9%
	Dividend rate	0%		0%
Stock Appreciation Rights Activity	'
	Stock appreciation rights activity is summarized in the following table:
		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		(3,259	)		—
	Exercised		—			—
	Balance—March 31, 2014		124,285		$	11.72		2.83	$	2,670
	Exercisable—March 31, 2014		39,548		$	11.18		2.78	$	871
	Vested and expected to vest—March 31, 2014		116,828		$	11.66		2.82	$	2,516
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):
		Three Months Ended March 31,
		2014			2013
	Compensation paid in stock related to vesting of stock based awards:
	Cost of revenue	$	426		$	41
	Technology and development		1,844			411
	Sales and marketing		3,493			337
	General and administrative		4,125			603
	Total compensation paid in stock		9,888			1,392
	Other compensation paid in stock		—			—
	Total compensation paid in stock	$	9,888		$	1,392
Performance Based Award [Member]	'
Assumptions Used to Estimate Fair Value of Each Performance Based Awards	'
	The fair value of performance based awards with market based condition was estimated using the Monte Carlo simulation model with the following weighted average assumptions:
		As of May 29,		As of 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	52.60%		52.60%
	Dividend yield	0%		0%
	Cost of equity	12.60%		12.30%
Stock Appreciation Rights Activity [Member]	'
Value of Each Employee Stock Appreciation Right	'
	The value of each employee stock appreciation right was estimated at the end of the reporting period using the Black-Scholes options pricing model with the following weighted average assumptions:
		Three Months
		Ended March 31,
		2014
	Estimated term (in years)	1.41
	Risk-free interest rate	0.29%
	Expected volatility	35%
	Expected dividend yield	0%

Net_Loss_per_Share_Attributabl1

Net Loss per Share Attributable to Common Stockholders (Tables)	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Computation of Basic and Diluted Earnings Attributable to Common Stockholders	'
	The following table sets forth the computation of our basic and diluted net income (loss) per share attributable to common stockholders during the three months ended March 31, 2014 and 2013 (in thousands, except share and per share data):
		Three Months Ended
		March 31,
		2014			2013
	Net loss attributable to common stockholders	$	(15,151	)	$	(1,982	)
	Weighted average shares used in computing basic and diluted net loss per share		36,726,178			28,427,025
	Net loss per share attributable to common stockholders, basic and diluted	$	(0.41	)	$	(0.07	)
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:
		Three Months Ended March 31,
		2014			2013
	Stock options to purchase common stock		2,968,922			3,417,752
	Restricted stock units		3,593,860			552,008
	Stock appreciation rights		124,285			—
	Heldback shares in connection with Movity acquisition		30,524			30,524
	Convertible senior notes		6,400,969			—

Organization_and_Description_o1

Organization and Description of Business - Additional Information (Detail) (USD $)	0 Months Ended			3 Months Ended
	Dec. 17, 2013	Aug. 20, 2013	Dec. 17, 2013	Mar. 31, 2014
			2.75% Convertible Senior Notes [Member]	2.75% Convertible Senior Notes [Member]
				Trading_day
Initial Public Offering [Line Items]	'	'	'	'
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 Agreement and Plan of Merger (the "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 consideration	'	372,700,000	'	'
Debt instrument, aggregate principal amount	230,000,000	'	230,000,000	'
Debt instrument, interest rate stated percentage	'	'	2.75%	'
Proceeds from over-allotment of option granted to initial purchasers	30,000,000	'	30,000,000	'
Debt instrument, redemption period end date	15-Dec-20	'	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
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

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Fair value of convertible notes	$236,800,000	'	$252,000,000
Carrying value of convertible notes	230,000,000	'	230,000,000
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	4,823,000	'	'
Amounts due from third party merchant processors	336,000	'	349,000
Minimum [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Certificates of deposit with maturities period	'1 year	'	'
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_Schedu

Fair Value Measurements - Schedule of Fair Value of Financial Assets Remeasured on Recurring Basis (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financial Assets:	'	'
Total financial assets	$13,095	$8,272
Money market funds [Member]	'	'
Financial Assets:	'	'
Total financial assets	6,683	6,683
Restricted cash [Member]	'	'
Financial Assets:	'	'
Total financial assets	6,412	1,589
Level I [Member]	'	'
Financial Assets:	'	'
Total financial assets	13,095	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	6,412	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	'	'

Property_and_Equipment_net_Pro

Property and Equipment, net - Property and Equipment (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Total property and equipment	$39,574	$33,521
Less: accumulated depreciation and amortization	-13,575	-11,232
Total property and equipment, net	25,999	22,289
Computer equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total property and equipment	7,887	7,275
Capitalized product development costs [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total property and equipment	12,416	9,934
Furniture and fixtures [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total property and equipment	3,802	3,276
Leasehold improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total property and equipment	9,852	8,985
Software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total property and equipment	1,052	183
Equipment not yet in service [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total property and equipment	$4,565	$3,868

Property_and_Equipment_net_Add

Property and Equipment, net - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Property, Plant and Equipment [Line Items]	'	'	'
Property and equipment under capital lease, included under computer equipment	$131,000	'	$261,000
Accumulated depreciation and amortization	13,575,000	'	11,232,000
Depreciation and amortization expense	2,400,000	1,400,000	'
Capital lease [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Accumulated depreciation and amortization	23,000	'	87,000
Capitalized product development costs [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Capitalized costs associated with product development	3,800,000	1,600,000	'
Amortization expense for product development costs	$1,200,000	$199,000	'

Intangible_Assets_Schedule_of_

Intangible Assets - Schedule of Intangible Assets Subject to Amortization (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'
Gross	$123,885	$123,801
Accumulated Amortization	-9,812	-5,913
Intangible assets, Net	114,073	117,888
Enterprise Relationships [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross	29,000	29,000
Accumulated Amortization	-1,777	-1,052
Intangible assets, Net	27,223	27,948
Premium Users [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross	15,200	15,200
Accumulated Amortization	-1,863	-1,103
Intangible assets, Net	13,337	14,097
Existing Technology [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross	32,300	32,300
Accumulated Amortization	-2,828	-1,675
Intangible assets, Net	29,472	30,625
Trade Names [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross	42,900	42,900
Accumulated Amortization	-2,629	-1,557
Intangible assets, Net	40,271	41,343
Home/MLS data feeds [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross	3,700	3,700
Accumulated Amortization	-227	-134
Intangible assets, Net	3,473	3,566
Other [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross	785	701
Accumulated Amortization	-488	-392
Intangible assets, Net	$297	$309

Intangible_Assets_Additional_I

Intangible Assets - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Aug. 20, 2013	Mar. 31, 2014	Mar. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'	'	'
Business acquisition, number of shares issued	4,412,489	'	'
Business acquisition, cash paid on acquisition	$170,500,000	'	'
Total purchase consideration	372,700,000	'	'
Total value allocated to intangible assets	123,100,000	'	'
Amortization expense	'	$3,900,000	$56,000

Intangible_Assets_Schedule_of_1

Intangible Assets - Schedule of Future Amortization Expense (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]	'	'
2014 (remaining nine months)	$11,701	'
2015	15,222	'
2016	15,214	'
2017	15,214	'
2018	14,111	'
Thereafter	42,611	'
Intangible assets, Net	$114,073	$117,888

Debt_Additional_Information_De

Debt - Additional Information (Detail) (USD $)	0 Months Ended		3 Months Ended
	Dec. 31, 2013	Dec. 17, 2013	Mar. 31, 2014
Debt Disclosure [Abstract]	'	'	'
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	'
Fair value of convertible notes	252,000,000	'	236,800,000
Carrying value of convertible notes	230,000,000	'	230,000,000
Payment of debt issuance costs	'	7,600,000	'
Amount of interest expense recognized	246,000	'	1,800,000
Amortization of debt issuance costs	$38,000	'	$245,000

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended				3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 10, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
			sqft	October 2015 [Member]	Minimum [Member]	Maximum [Member]	Indemnification Agreement [Member]	Indemnification Agreement [Member]
				sqft
Loss Contingencies [Line Items]	'	'	'	'	'	'	'	'
Noncancelable operating leases term	'	'	'	'	'1 year	'9 years	'	'
Area of leased office space	'	'	52,595	26,682	'	'	'	'
Lease agreement term	'107 months	'	'	'	'	'	'	'
Options to lease additional office space	'Options to lease up to an aggregate of approximately 40,000 square feet of additional office space under the Lease.	'	'	'	'	'	'	'
Future minimum lease payments per month	$53,316,000	'	'	'	$182,000	$347,000	'	'
Secured letter of credit arrangement deposit classified as restricted cash	3,800,000	'	'	'	'	'	'	'
Rent expense	1,100,000	727,000	'	'	'	'	'	'
Merger related reimbursement costs	350,000	'	'	'	'	'	'	'
Obligations related to indemnification agreements	'	'	'	'	'	'	$0	$0

Commitments_and_Contingencies_2

Commitments and Contingencies - Schedule of Minimum Payments under Noncancelable Operating Leases (Detail) (USD $)	Mar. 31, 2014
In Thousands, unless otherwise specified
Commitments And Contingencies Disclosure [Abstract]	'
2014 (remaining nine months)	$2,689
2015	6,201
2016	5,900
2017	6,044
2018	6,222
Thereafter	26,260
Total minimum lease payments	$53,316

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of Common Stock Reserved (Detail)	Mar. 31, 2014	Dec. 31, 2013
Conversion of Stock [Line Items]	'	'
Stock options and awards issued and outstanding	6,687,067	6,452,832
Stock options and awards available for grant	3,159,568	2,059,599
Total	9,846,635	8,512,431
2012 Plan [Member]	'	'
Conversion of Stock [Line Items]	'	'
Stock options and awards available for grant	2,885,250	1,976,815
2004 Plan [Member]	'	'
Conversion of Stock [Line Items]	'	'
Stock options and awards available for grant	274,318	82,784

Compensation_Paid_in_Stock_Add

Compensation Paid in Stock - Additional Information (Detail) (USD $)

3 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

Mar. 31, 2014

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Jun. 05, 2013

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Sep. 30, 2013

Jun. 30, 2013

Sep. 30, 2013

Jun. 30, 2013

Jan. 02, 2014

Mar. 31, 2014

Mar. 31, 2014

Product development costs [Member]

Product development costs [Member]

2012 Equity Incentive Plan [Member]

2012 Equity Incentive Plan [Member]

2012 Equity Incentive Plan [Member]

2012 Equity Incentive Plan [Member]

Stock Appreciation Rights Activity [Member]

Stock Appreciation Rights Activity [Member]

Non-vested RSUs [Member]

Performance Based Awards [Member]

Performance Based Awards [Member]

Performance Based Awards [Member]

Time based awards [Member]

Time based awards [Member]

2004 Equity Incentive Plan [Member]

2004 Equity Incentive Plan [Member]

Stock Option Activity [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%

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of options vested

25.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options vesting period

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options expiration period

'10 years

'

'

'

'

'

'

'

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

Certain options, vesting terms

'Certain options vest monthly over two to four years.

'

'

'

'

'

'

'

'

'

'

'Our stock appreciation rights typically vest on a graded basis over either a two or four year period and typically expire the earlier of five years from the date of grant or ninety days following termination of employment.

'

'

'

'

'

'

'

'

'

'

Ratio of remaining options shares vested

'0.028

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock reserved for future issuance

9,846,635

'

'

'

8,512,431

'

'

'

2,370,000

'

'

'

'

'

'

'

'

'

'

'

283,522

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in shares available for grant under the 2012 plan

'

'

'

'

'

'

'

'

'

1,463,303

1,102,112

'

'

'

'

'

'

'

'

'

'

'

Increase in shares approved by stockholders

'

'

'

'

'

'

'

2,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in common stock reserved for issuance

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

202,770

'

'

Shares of common stock available for grant under 2012 Plan and 2004 plan

3,159,568

'

'

'

2,059,599

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average grant date fair value of options granted

$14.87

'

'

$12.63

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options exercises in period aggregate intrinsic value

$4,900,000

'

'

$11,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options vested, grant date fair value

2,100,000

'

'

756,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecognized compensation cost related to non-vested stock options granted, net

12,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Estimated forfeitures of stock-based awards granted

'

'

'

'

'

'

'

'

'

'

'

82,000

'

5,700,000

1,400,000

'

'

'

'

'

'

1,300,000

Weighted average vesting period

'2 years 4 months 17 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecognized compensation cost related to non-vested stock units, net of estimated forfeitures

'

'

'

'

'

'

'

'

'

'

'

2,200,000

'

51,000,000

27,300,000

'

'

'

'

'

'

'

Weighted average vesting period of stock units

'

'

'

'

'

'

'

'

'

'

'

'1 year 8 months 16 days

'

'3 years 7 days

'2 years 9 months 4 days

'

'

'

'

'

'

'

Stock unit awards granted during period

'

2,105,000

2,105,000

'

'

'

'

'

'

'

'

'

'

597,083

'

1,576,250

1,576,250

528,750

528,750

'

'

'

Recognized compensation cost

9,888,000

'

'

1,392,000

'

'

'

'

'

'

'

'

'

'

2,800,000

'

'

'

'

'

'

'

Stock appreciation rights

'

'

'

'

'

'

'

'

'

'

'

114,000

'

'

'

'

'

'

'

'

'

'

Aggregate intrinsic value, Exercised

'

'

'

'

'

'

'

'

'

'

'

1,100,000

'

'

'

'

'

'

'

'

'

'

Estimated grant date fair value vested

'

'

'

'

'

'

'

'

'

'

'

412,000

'

'

'

'

'

'

'

'

'

'

Number of stock appreciation rights issued

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

Number of stock appreciation rights outstanding

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

Capitalized compensation paid in stock

'

'

'

'

'

$295,000

$113,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Compensation_Paid_in_Stock_Sto

Compensation Paid in Stock - Stock Option Activity under 2005 Plan, 2012 Plan, 1999 Plan and 2004 Plan (Detail) (USD $)	3 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'
Stock Options Outstanding, Beginning balance	3,088,449	'
Stock Options Outstanding, Granted	131,080	'
Stock Options Outstanding, Canceled	-44,601	'
Stock Options Outstanding, Exercised	-206,006	'
Stock Options Outstanding, Ending balance	2,968,922	3,088,449
Stock Options Outstanding, Options exercisable	1,473,977	'
Stock Options Outstanding, Options vested and expected to vest	2,884,299	'
Weighted Average Exercise Price, Beginning balance	$13.90	'
Weighted Average Exercise Price, Granted	$32.65	'
Weighted Average Exercise Price, Canceled	$11.17	'
Weighted Average Exercise Price, Exercised	$8.17	'
Weighted Average Exercise Price, Ending balance	$15.16	$13.90
Weighted Average Exercise Price, Options exercisable	$9.94	'
Weighted Average Exercise Price, Options vested and expected to vest	$14.91	'
Weighted Average Remaining Contractual Life (Years)	'7 years 5 months 1 day	'7 years 5 months 1 day
Weighted Average Remaining Contractual Life (Years), Options exercisable	'6 years 4 months 10 days	'
Weighted Average Remaining Contractual Life (Years), Options vested and expected to vest	'7 years 4 months 17 days	'
Aggregate Intrinsic Value, Beginning balance	$68,131	'
Aggregate Intrinsic Value, Ending balance	56,428	68,131
Aggregate Intrinsic Value, Options exercisable	35,458	'
Aggregate Intrinsic Value, Options vested and expected to vest	$55,522	'

Compensation_Paid_in_Stock_Res

Compensation Paid in Stock - Restricted Stock Units Activity (Detail) (USD $)	3 Months Ended			12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2014	Dec. 31, 2013
			Non-vested RSUs [Member]	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	2,105,000	2,105,000	597,083	'
Number of shares, Canceled	'	'	-51,856	'
Number of shares, Released	'	'	-173,206	'
Number of shares, Ending balance	'	'	2,032,610	1,660,589
Number of shares, Restricted stock units expected to vest	'	'	1,798,404	'
Weighted Average Grant Date fair Value, Beginning balance	'	'	$35.28	'
Weighted Average Grant Date fair Value, Granted	'	'	$30.70	'
Weighted Average Grant Date fair Value, Canceled	'	'	$35.19	'
Weighted Average Grant Date Fair Value, Released	'	'	$31.60	'
Weighted Average Grant Date fair Value, Ending balance	'	'	$27.22	$35.28
Weighted Average Grant Date fair Value, Restricted stock units expected to vest	'	'	$34.29	'
Weighted Average Remaining Contractual Life (Years), Unvested	'	'	'1 year 10 months 24 days	'1 year 11 months 9 days
Weighted Average Remaining Contractual Life (Years), Restricted stock units expected to vest	'	'	'1 year 9 months 26 days	'
Aggregate Intrinsic Value, Beginning balance	'	'	$58,569	'
Aggregate Intrinsic Value, Ending balance	'	'	67,483	58,569
Aggregate Intrinsic Value, Restricted stock units expected to vest	'	'	$59,707	'

Compensation_Paid_in_Stock_Sum

Compensation Paid in Stock - Summary of Performance-Based Awards (Detail) (USD $)	3 Months Ended			12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Number of shares, Granted	'	2,105,000	2,105,000	'
Performance Based Awards [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Number of shares, Beginning balance	1,576,250	'	'	'
Number of shares, Granted	'	1,576,250	1,576,250	'
Number of shares, Canceled	-15,000	'	'	'
Number of shares, Released	'	'	'	'
Number of shares, Ending balance	1,561,250	'	'	1,576,250
Number of shares, Restricted stock units expected to vest-March 31, 2014	1,484,567	'	'	'
Weighted Average Grant Date fair Value, Beginning balance	$22.84	'	'	'
Weighted Average Grant Date fair Value, Ending balance	$22.89	'	'	$22.84
Weighted Average Grant Date fair Value, Restricted stock units expected to vest	$22.92	'	'	'
Weighted Average Remaining Contractual Life (Years), Unvested	'2 years 9 months 4 days	'	'	'3 years
Weighted Average Remaining Contractual Life (Years), Restricted stock units expected to vest-March 31, 2014	'2 years 9 months	'	'	'
Aggregate Intrinsic Value, Beginning balance	$55,594	'	'	'
Aggregate Intrinsic Value, Ending balance	51,834	'	'	55,594
Aggregate Intrinsic Value, Restricted stock units expected to vest-March 31, 2014	$49,288	'	'	'

Compensation_Paid_in_Stock_Ass

Compensation Paid in Stock - Assumptions Used to Estimate Fair Value of Each Employee Stock Option Awards (Detail) (Black-Scholes option-pricing model [Member])	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Black-Scholes option-pricing model [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Expected term (in years)	'5 years 4 months 24 days	'5 years 4 months 24 days
Expected volatility	49.00%	52.00%
Risk-free interest rate	1.70%	0.90%
Dividend rate	0.00%	0.00%

Compensation_Paid_in_Stock_Ass1

Compensation Paid in Stock - Assumptions Used to Estimate Fair Value of Each Performance Based Awards (Detail) (Monte Carlo simulation model [Member], Performance Based Awards [Member], USD $)	0 Months Ended
	Aug. 29, 2013	29-May-13
Monte Carlo simulation model [Member] | Performance Based Awards [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Stock price	$41.67	$30.31
Simulation period	'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%

Compensation_Paid_in_Stock_Sto1

Compensation Paid in Stock - Stock Appreciation Rights Activity (Detail) (USD $)	3 Months Ended			12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2014	Dec. 31, 2013
			Stock Appreciation Rights Activity [Member]	Stock Appreciation Rights Activity [Member]
Stock Appreciation Rights Activity [Line Items]	'	'	'	'
Number of shares, Beginning balance	'	'	127,544	'
Number of shares, Granted	2,105,000	2,105,000	'	'
Number of shares, Canceled	'	'	-3,259	'
Number of shares, Exercised	'	'	'	'
Number of shares, Ending balance	'	'	124,285	127,544
Number of shares, Exercisable	'	'	39,548	'
Number of shares, Vested and expected to vest	'	'	116,828	'
Weighted Average Exercise Price, Beginning balance	'	'	$11.83	'
Weighted Average Exercise Price, Granted	'	'	'	'
Weighted Average Exercise Price, Canceled	'	'	'	'
Weighted Average Exercise Price, Exercised	'	'	'	'
Weighted Average Exercise Price, Ending balance	'	'	$11.72	$11.83
Weighted Average Exercise Price, Exercisable	'	'	$11.18	'
Weighted Average Exercise Price, Vested and expected to vest	'	'	$11.66	'
Weighted Average Remaining Contractual Life (Years)	'	'	'2 years 9 months 29 days	'3 years 29 days
Weighted Average Remaining Contractual Life (Years), Exercisable	'	'	'2 years 9 months 11 days	'
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest	'	'	'2 years 9 months 26 days	'
Aggregate Intrinsic Value, Beginning balance	'	'	$2,990	'
Aggregate Intrinsic Value, Ending balance	'	'	2,670	2,990
Aggregate Intrinsic Value, Exercisable	'	'	871	'
Aggregate Intrinsic Value, Vested and expected to vest	'	'	$2,516	'

Compensation_Paid_in_Stock_Val

Compensation Paid in Stock - Value of Each Employee Stock Appreciation Right Granted (Detail) (Stock Appreciation Rights Activity [Member])	3 Months Ended
	Mar. 31, 2014
Stock Appreciation Rights Activity [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Estimated term (in years)	'1 year 4 months 28 days
Risk-free interest rate	0.29%
Expected volatility	35.00%
Expected dividend yield	0.00%

Compensation_Paid_in_Stock_Com

Compensation Paid in Stock - Compensation Expense for Stock Based Awards Granted to Employees (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Compensation paid in stock	$9,888	$1,392
Other compensation paid in stock	'	'
Total compensation paid in stock	9,888	1,392
Cost of revenue [Member]	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Compensation paid in stock	426	41
Technology and development [Member]	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Compensation paid in stock	1,844	411
Sales and marketing [Member]	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Compensation paid in stock	3,493	337
General and administrative [Member]	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'
Compensation paid in stock	$4,125	$603

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 $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]	'	'
Net loss attributable to common stockholders	($15,151)	($1,982)
Weighted average shares used in computing basic and diluted net loss per share	36,726,178	28,427,025
Net loss per share attributable to common stockholders, basic and diluted	($0.41)	($0.07)

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)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Stock options to purchase common stock [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive stock	2,968,922	3,417,752
Restricted stock units [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive stock	3,593,860	552,008
Stock Appreciation Rights [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive stock	124,285	'
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
Convertible Senior Notes [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive stock	6,400,969	'

Employee_Benefit_Plan_Addition

Employee Benefit Plan - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Compensation And Retirement Disclosure [Abstract]	'	'
Company's contribution based on employee contribution	4.00%	'
Company's expense related to its benefit plan	$592,000	$264,000
Discretionary employer contributions amount	$0	'

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	3 Months Ended				1 Months Ended
	Mar. 31, 2014	Mar. 10, 2014	Mar. 31, 2014	Mar. 31, 2014	Apr. 30, 2014	Apr. 30, 2014	Apr. 30, 2014
		sqft	Minimum [Member]	Maximum [Member]	Subsequent Events [Member]	Subsequent Events [Member]	Subsequent Events [Member]
					sqft	Minimum [Member]	Maximum [Member]
Subsequent Event [Line Items]	'	'	'	'	'	'	'
Area of leased office space	'	52,595	'	'	64,908	'	'
Lease agreement term	'107 months	'	'	'	'90 months	'	'
Lease agreement commencement date	'	'	'	'	'May 1, 2014	'	'
Lease rent escalation period	'	'	'	'	'90 months	'	'
Rent abatement period	'	'	'	'	'6 months	'	'
Future minimum lease payments per month	$53,316,000	'	$182,000	$347,000	'	$124,000	$141,000
Secured letter of credit arrangement deposit classified as restricted cash	$3,800,000	'	'	'	$1,100,000	'	'