Yelp (YELP) 10-Q 29 Oct 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 28, 2013	Oct. 28, 2013
		Common Class A [Member]	Common Class B [Member]
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	30-Sep-13
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Trading Symbol	YELP
Entity Registrant Name	YELP INC
Entity Central Index Key	1345016
Current Fiscal Year End Date	-19
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		53,912,809	12,188,208

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$101,214	$95,124
Accounts receivable (net of allowance for doubtful accounts of $624 and $384 at September 30, 2013 and December 31, 2012, respectively)	17,192	11,738
Prepaid expenses and other current assets	6,809	4,912
Total current assets	125,215	111,774
Property, equipment and software, net	25,921	14,799
Goodwill	58,814	48,605
Intangibles, net	5,772	5,936
Restricted cash	8,168	6,400
Other assets	440	182
Total assets	224,330	187,696
Current liabilities:
Accounts payable	2,839	2,284
Accrued liabilities	22,040	16,367
Deferred revenue	2,221	2,856
Total current liabilities	27,100	21,507
Long term liabilities	799	527
Total liabilities	27,899	22,034
Commitments and contingencies (Note 9)
Stockholders' equity
Common stock, $0.000001 par value-500,000,000 shares authorized; 65,973,621 and 63,505,269 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively
Additional paid-in capital	262,675	225,245
Accumulated other comprehensive income (loss)	2,143	805
Accumulated deficit	-68,387	-60,388
Total stockholders' equity	196,431	165,662
Total liabilities and stockholders' equity	$224,330	$187,696

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Allowance for doubtful accounts	$624	$384
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	65,973,621	63,505,269
Common stock, Shares Outstanding	65,973,621	63,505,269

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net revenue	$61,181	$36,371	$162,337	$96,410
Costs and expenses
Cost of revenue (exclusive of depreciation and amortization shown separately below)	4,277	2,501	11,635	6,925
Sales and marketing	34,126	21,302	93,123	60,404
Product development	11,208	5,753	26,441	14,230
General and administrative	10,535	6,987	29,447	23,679
Depreciation and amortization	2,816	1,780	7,931	4,802
Restructuring and integration			675
Total costs and expenses	62,962	38,323	169,252	110,040
Loss from operations	-1,781	-1,952	-6,915	-13,630
Other income (expense), net	-31	-14	-298	-23
Loss before income taxes	-1,812	-1,966	-7,213	-13,653
Provision for income taxes	-510	-45	-786	-142
Net loss	-2,322	-2,011	-7,999	-13,795
Accretion of redeemable convertible preferred stock				-31
Net loss attributable to common stockholders (Class A and B)	($2,322)	($2,011)	($7,999)	($13,826)
Net loss per share attributable to common stockholders (Class A and B)
Basic	($0.04)	($0.03)	($0.12)	($0.27)
Diluted	($0.04)	($0.03)	($0.12)	($0.27)
Weighted-average shares used to compute net loss per share attributable to common stockholders (Class A and B)
Basic	65,530	61,267	64,620	51,176
Diluted	65,530	61,267	64,620	51,176

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net loss	($2,322)	($2,011)	($7,999)	($13,795)
Other comprehensive income (loss):
Foreign currency translation adjustments	2,333	73	1,338	-121
Other comprehensive income (loss)	2,333	73	1,338	-121
Comprehensive income (loss)	$11	($1,938)	($6,661)	($13,916)

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
OPERATING ACTIVITIES:
Net loss	($7,999)	($13,795)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	7,931	4,802
Provision for doubtful accounts and sales returns	2,178	193
Stock-based compensation	17,888	11,621
Loss on disposal of assets and website development costs	188	25
Changes in operating assets and liabilities:
Accounts receivable	-7,557	-2,657
Prepaid expenses and other assets	-3,020	-1,760
Accounts payable and accrued expenses	3,179	672
Deferred revenue	-680	-829
Net cash provided by (used in) operating activities	12,108	-1,728
INVESTING ACTIVITIES:
Acquisition of SeatMe, net of cash acquired	-2,057
Purchases of property, equipment and software	-9,547	-3,484
Capitalized website and software development costs	-3,265	-2,334
Change in restricted cash	-1,768	-6,048
Goodwill measurement period adjustment	1,153
Net cash used in investing activities	-15,484	-11,866
FINANCING ACTIVITIES:
Proceeds from initial public offering, net of offering costs		112,257
Proceeds from issuance of common stock	9,702	2,824
Repurchase of common stock	-368
Net cash provided by financing activities	9,334	115,081
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	132	-140
CHANGE IN CASH AND CASH EQUIVALENTS	6,090	101,347
CASH AND CASH EQUIVALENTS-Beginning of period	95,124	21,736
CASH AND CASH EQUIVALENTS-End of period	101,214	123,083
SUPPLEMENTAL DISCLOSURES OF OTHER CASH FLOW INFORMATION:
Cash paid for income taxes, net of refunds	116	80
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Purchases of property and equipment recorded in accounts payable and accruals	3,878	770
Capitalized website and software development costs recorded in accounts payable and accruals	31
Accretion of redeemable convertible preferred stock		31
Vesting of early exercised options		$46

DESCRIPTION_OF_BUSINESS_AND_BA

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	9 Months Ended
	Sep. 30, 2013
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	1. DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION
	Yelp Inc. was incorporated in Delaware on September 3, 2004. Except where specifically noted or the context otherwise requires, the use of terms such as the “Company” and “Yelp” in these Notes to Condensed Consolidated Financial Statements refers to Yelp Inc. and its subsidiaries.
	Yelp connects people with great local businesses. Yelp’s users have contributed millions of reviews of almost every type of local business, giving a voice to consumers and bringing “word of mouth” online. Businesses of all sizes use the Yelp platform to engage with consumers at the critical moment when they are deciding where to spend their money.
	Basis of Presentation
	The accompanying condensed consolidated financial statements are unaudited. These unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and applicable rules and regulations of the U.S. 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 consolidated financial statements contained in the Company’s Annual Report on Form 10-K filed with the SEC on February 27, 2013 (the “Annual Report”). The condensed consolidated balance sheet as of December 31, 2012 included herein was derived from the audited consolidated financial statements as of that date but does not include all disclosures required by GAAP, including notes to the financial statements.
	The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, include all adjustments of a normal recurring nature necessary for the fair presentation of the interim periods presented.
	Significant Accounting Policies
	There have been no material changes to our significant accounting policies, as compared to the significant accounting policies described in the Annual Report.
	Effective January 1, 2013, the Company prospectively adopted Accounting Standards Update (“ASU”) 2013-02, “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” This update requires companies to provide information regarding the amounts reclassified out of accumulated other comprehensive income by component. In addition, companies are required to present, either on the face of the statement where net income (loss) is presented or in the accompanying notes, significant amounts reclassified out of accumulated other comprehensive income (loss) by the respective line items of net income (loss). The adoption of ASU 2013-02 did not have a material impact on the Company’s consolidated financial statements.
	Effective July 1, 2013, the Company prospectively adopted ASU 2013-11, “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the Financial Accounting Standards Board Emerging Issues Task Force).” This update eliminates diversity in practice for presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is available to reduce the taxable income or tax payable that would result from disallowance of a tax position. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements.
	Principles of Consolidation
	These condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
	Use of Estimates
	The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of income and expenses during the reporting period. These estimates are based on information available as of the date of the condensed consolidated financial statements; therefore, actual results could differ from management’s estimates.

FAIR_VALUE_OF_FINANCIAL_INSTRU

FAIR VALUE OF FINANCIAL INSTRUMENTS	9 Months Ended
	Sep. 30, 2013
FAIR VALUE OF FINANCIAL INSTRUMENTS	2. FAIR VALUE OF FINANCIAL INSTRUMENTS
	The accounting guidance for fair value measurements prioritizes the inputs used in measuring fair value in the following hierarchy:
	Level 1—Observable inputs, such as quoted prices in active markets,
	Level 2—Inputs other than the quoted prices in active markets that are observable directly, or
	Level 3—Unobservable inputs in which there is little or no market data, which requires the Company to develop its own assumptions.
	This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. On a recurring basis, the Company measures its financial assets at fair value. The Company’s investment instruments are classified within Level 1 of the fair value hierarchy because they are valued using quoted prices in active markets.
	The following table represents the Company’s financial instruments measured at fair value as of September 30, 2013 and December 31, 2012 (in thousands):
			September 30, 2013								December 31, 2012
			Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Money market funds(1)		$	83,286	$	—	$	—	$	83,286	$	87,262	$	—	$	—	$	87,262
	-1	Included in cash and cash equivalents on the condensed consolidated balance sheets.

ACQUISITIONS

ACQUISITIONS	9 Months Ended
	Sep. 30, 2013
ACQUISITIONS	3. ACQUISITIONS
	SeatMe, Inc.
	On July 24, 2013, the Company acquired SeatMe, Inc. (“SeatMe”). In connection with the acquisition, all of the outstanding capital stock and options to purchase capital stock of SeatMe were converted into the right to receive an aggregate of approximately $2.2 million in cash and 260,901 shares of Yelp Class A common stock with an aggregate fair value of approximately $9.7 million, as determined on the basis of the closing market price of the Company’s Class A common stock on the acquisition date. Of the total consideration paid in connection with the acquisition, $0.1 million in cash and 31,236 shares of Yelp Class A common stock are being held in escrow to secure indemnification obligations. The key factor underlying the acquisition was securing the technology to provide online reservations directly through the Company’s website with minimal product and engineering work.
	The acquisition was accounted for as a business combination in accordance with Accounting Standards Codification Topic 805, “Business Combinations” (“ASC 805”), with the results of SeatMe’s operations included in the consolidated financial statements starting on July 24, 2013. The following table summarizes the consideration paid for SeatMe and the allocation of the purchase price, based on the estimated fair value of the assets acquired and liabilities assumed at the acquisition date (in thousands):
		24-Jul-13
	Fair value of purchase consideration:
	Cash:
	Distributed to SeatMe equity holders	$	2,057
	Held in escrow account		56
	Class A common stock:
	Distributed to SeatMe equity holders		8,420
	Held in escrow account		1,246
	Total purchase consideration	$	11,779
	Fair value of net assets acquired:
	Cash and Cash Equivalents	$	56
	Property and equipment		47
	Intangibles		1,440
	Goodwill		10,279
	Other assets		117
	Total assets acquired		11,939
	Total liabilities assumed		160
	Net assets acquired	$	11,779
	Estimated useful lives of the intangible assets acquired are shown below:
	Intangible Type	Useful Life
	Developed technology		6 years
	Customer relationships		2 years
	Trade name		2 years
	Weighted average		5.6 years
	The intangible assets are being amortized on a straight-line basis, which reflects the pattern in which the economic benefits of the intangible assets are being utilized. The goodwill results from the Company’s opportunity to offer its customers and leverage the SeatMe web- and app-based reservation solution. None of the goodwill is deductible for tax purposes.
	For the three and nine months ended September 30, 2013, the Company recorded acquisition-related transaction costs of approximately $0.2 million, which were included in general and administrative expense in the accompanying consolidated statement of operations. Pro forma results of operations for this acquisition have not been presented because they are not material to the consolidated results of operations, either individually or in aggregate.
	Qype GmbH
	On October 23, 2012, the Company, through its wholly-owned subsidiary, Yelp Ireland Ltd., completed the acquisition of all the outstanding equity interests of Qype GmbH and its subsidiaries (collectively, “Qype”) for approximately $24.3 million in cash and Yelp Class A common stock with an approximate fair value of $23.3 million. Of the total consideration paid in connection with the acquisition, $10.3 million was held in the form of cash in escrow to secure indemnification obligations. The balance remaining in the escrow fund relating to this acquisition was approximately $9.4 million as of September 30, 2013. The acquisition was accounted for as a business combination in accordance with ASC 805, with the results of Qype’s operations included in the consolidated financial statements starting on October 23, 2012. The key factors underlying the acquisition were to secure an established European market presence, obtain Qype’s content and traffic and the opportunity for expansion.
	The unaudited pro forma financial information in the table below summarizes the combined results of operations for the Company and Qype, and includes the accounting effects resulting from the acquisition, including transaction, restructuring and integration costs, amortization charges from acquired intangible assets, and changes in depreciation due to differing asset values and depreciation lives as though the companies were combined as of January 1, 2012. The unaudited pro forma financial information, as presented below, is for informational purposes only and is not necessarily indicative of the results of operations that would have been achieved if the acquisition had taken place as of January 1, 2012 (in thousands, except per share data):
		Pro Forma
		Three Months Ended			Nine Months Ended
		30-Sep-12			30-Sep-12
	Revenue	$	39,810		$	104,546
	Net loss	$	(1,049	)	$	(18,160	)
	Basic and diluted net loss per share attributable to common stockholders	$	(0.02	)	$	(0.35	)
	In October 2012, following the acquisition of Qype, the Company announced its plan to reduce the size of the Qype workforce and terminate several of Qype’s leases. These actions were made in order to reduce the Company’s cost structure, enhance operating efficiencies and strengthen the Company’s business to achieve long-term profitable growth. As a result of this plan, the Company incurred restructuring charges during the fourth quarter of 2012 and the first quarter of 2013, which were included in the restructuring and integration costs in the consolidated statements of operations for such periods. Restructuring liabilities were $0.1 million as of September 30, 2013, and are included in accrued liabilities on the accompanying condensed consolidated balance sheet. The Company’s restructuring plan was substantially completed during the nine months ended September 30, 2013. Any additional expense related to this restructuring plan incurred in the future is expected to be immaterial. The Company has recorded restructuring charges of $1.9 million to date. The following table summarizes the changes in the Company’s restructuring liabilities (in thousands):
	Balance as of December 31, 2012	$	685
	Provision		935
	Payments		(1,304	)
	Adjustment to prior provision		(261	)
	Balance as of September 30, 2013	$	55

CASH_AND_CASH_EQUIVALENTS

CASH AND CASH EQUIVALENTS	9 Months Ended
	Sep. 30, 2013
CASH AND CASH EQUIVALENTS	4. CASH AND CASH EQUIVALENTS
	Cash and cash equivalents as of September 30, 2013 and December 31, 2012 consist of the following (in thousands):
		September 30,		December 31,
		2013		2012
	Cash and cash equivalents
	Cash	$	17,928	$	7,862
	Money market funds		83,286		87,262
	Total cash and cash equivalents	$	101,214	$	95,124
	In addition, the lease agreements for the Company’s San Francisco, New York and London, England offices each require the Company to maintain a letter of credit issued to the landlords of each facility. Each letter of credit is subject to renewal annually until the lease expires. As of September 30, 2013 and December 31, 2012, the Company had letters of credit in the aggregate amount of $8.2 million and $6.4 million, respectively, related to such leases.

PROPERTY_EQUIPMENT_AND_SOFTWAR

PROPERTY, EQUIPMENT AND SOFTWARE, NET	9 Months Ended
	Sep. 30, 2013
PROPERTY, EQUIPMENT AND SOFTWARE, NET	5. PROPERTY, EQUIPMENT AND SOFTWARE, NET
	Property, equipment and software, net as of September 30, 2013 and December 31, 2012 consist of the following (in thousands):
		September 30,			December 31,
		2013			2012
	Computer equipment	$	11,559		$	8,315
	Software		458			433
	Capitalized website and internal-use software development costs		12,119			8,653
	Furniture and fixtures		3,525			2,613
	Leasehold improvements		11,592			5,017
	Telecommunication		1,909			1,570
	Total		41,162			26,601
	Less accumulated depreciation		(15,241	)		(11,802	)
	Property, equipment and software, net	$	25,921		$	14,799
	Depreciation expense for the three months ended September 30, 2013 and 2012 was approximately $1.9 million and $1.5 million, respectively, and for the nine months ended September 30, 2013 and 2012, depreciation expense was approximately $5.3 million and $4.0 million, respectively.

GOODWILL_AND_INTANGIBLE_ASSETS

GOODWILL AND INTANGIBLE ASSETS	9 Months Ended
	Sep. 30, 2013
GOODWILL AND INTANGIBLE ASSETS	6. GOODWILL AND INTANGIBLE ASSETS
	The Company’s goodwill is the result of the acquisition of Qype on October 23, 2012 and the acquisition of SeatMe on July 24, 2013, and represents the excess of purchase consideration over the fair value of assets and liabilities acquired.
	The changes in the carrying amount of goodwill for the nine months ended September 30, 2013 were as follows (in thousands):
	Balance as of December 31, 2012	$	48,605
	Goodwill acquired		10,279
	Measurement period adjustment		(1,153	)
	Effect of currency translation		1,083
	Balance as of September 30, 2013	$	58,814
	Under the terms of the share purchase agreement by and among the Company, its wholly-owned subsidiary Yelp Ireland Ltd., Qype and its shareholders, the Qype purchase price was subject to a post-closing adjustment based on Qype’s net working capital as of the acquisition date. On April 15, 2013, Yelp and the former Qype shareholders agreed to an adjustment of the purchase price in favor of Yelp in the amount of €0.9 million (approximately $1.2 million as of September 30, 2013) based on Qype’s net working capital as of the acquisition date. As this agreement occurred during the measurement period of the acquisition, as defined by ASC 805, the impact of this adjustment was recorded as an increase to cash and a decrease to goodwill. The related funds were released to the Company from the escrow fund during the nine months ended September 30, 2013.
	The intangible assets detail at September 30, 2013 and December 31, 2012 consist of the following (dollars in thousands):
										Weighted
		Gross						Net		Average
		Carrying			Accumulated			Carrying		Remaining
		Amount			Amortization			Amount		Life
	September 30, 2013:
	Content	$	3,346		$	(719	)	$	2,627		4.1 years
	Advertiser relationships		2,005			(859	)		1,146		1.1 years
	Developed technology		1,843			(292	)		1,551		5.0 years
	Trade name and other		546			(203	)		343		1.4 years
	Domains		250			(145	)		105		4.0 years
		$	7,990		$	(2,218	)	$	5,772
										Weighted
		Gross						Net		Average
		Carrying			Accumulated			Carrying		Remaining
		Amount			Amortization			Amount		Life
	December 31, 2012:
	Content	$	3,304		$	(126	)	$	3,178		4.8 years
	Advertiser relationships		1,982			(188	)		1,794		1.8 years
	Developed technology		529			(51	)		478		1.8 years
	Trade name and other		396			(38	)		358		1.8 years
	Domains		246			(118	)		128		4.6 years
		$	6,457		$	(521	)	$	5,936
	Amortization expense was $0.6 million and zero for the three months ended September 30, 2013 and 2012, respectively, and $1.6 million and zero for the nine months ended September 30, 2013 and 2012, respectively.
	As of September 30, 2013, the estimated future amortization of purchased intangible assets for (i) the remaining three months of 2013, (ii) each of the succeeding four years and (iii) the succeeding fifth year and thereafter are as follows (in thousands):
	Year Ending December 31,	Amount
	2013 (from October 1, 2013)	$	631
	2014		2,229
	2015		922
	2016		880
	2017		758
	2018 and thereafter		352
	Total amortization	$	5,772

ACCRUED_LIABILITIES

ACCRUED LIABILITIES	9 Months Ended
	Sep. 30, 2013
ACCRUED LIABILITIES	7. ACCRUED LIABILITIES
	Accrued liabilities as of September 30, 2013 and December 31, 2012 consist of the following (in thousands):
		September 30,		December 31,
		2013		2012
	Accrued vacation and employee related expenses	$	4,870	$	2,463
	Accrued commissions		2,918		2,037
	Deferred rent		1,784		1,755
	Legal settlement accrual		—		2,167
	Accrued value added taxes payable		978		1,260
	Accrued payroll tax		1,271		845
	Merchant revenue share liability		689		538
	Accrued restructuring and integration		55		710
	Fixed asset purchase commitments		3,878		383
	Other accrued expenses		5,597		4,209
	Total	$	22,040	$	16,367

OTHER_INCOME_EXPENSE_NET

OTHER INCOME (EXPENSE), NET	9 Months Ended
	Sep. 30, 2013
OTHER INCOME (EXPENSE), NET	8. OTHER INCOME (EXPENSE), NET
	Other income (expense), net for the three and nine months ended September 30, 2013 and 2012 consists of the following (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Interest income	$	11		$	16		$	41		$	34
	Transaction gain (loss) on foreign exchange		50			(20	)		(173	)		(29	)
	Other non-operating income (loss), net		(92	)		(10	)		(166	)		(28	)
	Other income (expense), net	$	(31	)	$	(14	)	$	(298	)	$	(23	)

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 30, 2013
COMMITMENTS AND CONTINGENCIES	9. COMMITMENTS AND CONTINGENCIES
	Office Facility Leases — The Company leases its office facilities under operating lease agreements that expire from November 2014 to September 2021. The terms of the lease agreements provide for rental payments on a graduated basis. The Company recognizes rent expense on a straight-line basis over the lease period.
	Rental expense was $2.3 million and $1.1 million for the three months ended September 30, 2013 and 2012, respectively, and was $5.5 million and $3.0 million for the nine months ended September 30, 2013 and 2012, respectively.
	Legal Proceedings — The Company is subject to legal proceedings arising in the ordinary course of business. Although the results of litigation and claims cannot be predicted with certainty, the Company currently does not believe that the final outcome of any of these matters will have a material adverse effect on the Company’s business, financial position, results of operations or cash flows.
	In February and March 2010, the Company was sued in two putative class actions on behalf of local businesses asserting various causes of action based on claims that the Company manipulated the ratings and reviews on its platform to coerce local businesses to buy its advertising products. These cases were subsequently consolidated in an action asserting claims for violation of the California Business & Professions Code, extortion and attempted extortion based on the conduct they allege and seeking monetary relief in an unspecified amount and injunctive relief. In October 2011, the court dismissed this consolidated action with prejudice. The plaintiffs have appealed to the U.S. Court of Appeals for the Ninth Circuit, which heard the appeal on July 11, 2013. The Ninth Circuit has not yet issued a decision. Accordingly, the Company is currently unable to reasonably estimate either the probability of incurring a loss or an estimated range of such loss, if any, from this appeal.
	In March 2011, the Company was sued in an action on behalf of certain current and former employees asserting claims for violations of the federal Fair Labor Standards Act, the California Labor Code and the California Business & Professions Code seeking monetary relief in an unspecified amount. In December 2012, the court issued a judgment giving final approval to a settlement of this matter, without any admission of liability on the Company’s part, for payments by the Company in an aggregate amount of approximately $0.8 million. The Company had originally accrued for a settlement of approximately $1.3 million in the year ended December 31, 2010. The accrual was adjusted in the quarter ended December 31, 2012 for the final settlement amount, which was paid in the first quarter of 2013.
	Qype, an indirect wholly-owned subsidiary of the Company, had been party to two lawsuits regarding fees payable for directory data that Qype and its predecessor purchased from Deutsche Telekom AG (“Deutsche Telekom”) between 2005 and 2008 at a rate set by the German Federal Network Agency (“FNA”). Following German court decisions overturning the rate set by the FNA, Deutsche Telekom sued Qype in the Regional Court of Bonn on August 26, 2010 for approximately €1.5 million plus interest for additional fees for data delivered between 2005 and 2008 (the “2010 Claim”). In August 2011, the court rejected Deutsche Telekom’s claim in full and Deutsche Telekom appealed the decision to the Higher Regional Court of Cologne, which referred the appeal to the Higher Regional Court in Düsseldorf in July 2012. Following a hearing in April 2013, the Higher Regional Court denied Deutsche Telekom’s appeal in September 2013, although Deutsche Telekom may challenge this decision. In addition, on August 6, 2012, Deutsche Telekom filed a claim against Qype in the Regional Court of Bonn for approximately €118,400 plus interest asserting Qype was unjustly enriched as a result of paying an insufficient rate for directory data from 2005 to 2008. However, following a hearing on December 19, 2012, the court dismissed Deutsche Telekom’s claim in full and the time for appeal has lapsed. In August 2013, Deutsche Telekom filed a claim against Qype in the Regional Court of Cologne seeking approximately €441,900 in additional data service fees plus interest for data delivered in 2009. The Company has requested that the Regional Court stay proceedings in this case pending final resolution of the 2010 Claim. During the three months ended September 30, 2013, under the applicable authoritative literature, the Company has reversed the accrual for a loss contingency that was recorded as of the acquisition date of Qype.
	Indemnification Agreements — In the ordinary course of business, the Company may provide indemnifications of varying scope and terms to customers, vendors, lessors, business partners and other parties with respect to certain matters, including, but not limited to, losses arising out of breach of such agreements, services to be provided by the Company or from intellectual property infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with directors and certain officers and employees that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors, officers or employees.
	While the outcome of these matters cannot be predicted with certainty, the Company does not believe that the outcome of any claims listed above or any other claims under indemnification arrangements will have a material effect on the Company’s financial position, results of operations or cash flows.

STOCKHOLDERS_EQUITY

STOCKHOLDERS' EQUITY	9 Months Ended
	Sep. 30, 2013
STOCKHOLDERS' EQUITY	10. STOCKHOLDERS’ EQUITY
	Initial Public Offering
	In March 2012, the Company completed its initial public offering of its Class A common stock to the public (the “IPO”) whereby 8,172,500 shares of Class A common stock were sold by the Company (inclusive of 1,072,500 shares of Class A common stock from the full exercise of the overallotment option of shares granted to the underwriters) and 50,000 shares of Class A common stock were sold by a selling stockholder, The Yelp Foundation. The public offering price of the shares sold in the offering was $15.00 per share. The Company did not receive any proceeds from the sales of shares by the selling stockholder. The total gross proceeds from the offering to the Company were $122.6 million. After deducting underwriters’ discounts and commissions and offering expenses, the aggregate net proceeds received by the Company totaled approximately $111.4 million. Immediately prior to the closing of the IPO, all shares of the Company’s outstanding redeemable convertible preferred stock automatically converted into 35,816,772 shares of Class B common stock. As a result, following the IPO, the Company has two classes of common stock outstanding: Class A common stock (one vote per share) and Class B common stock (ten votes per share).
	The following table presents the shares authorized and issued and outstanding as of the periods presented (in thousands, except share data):
		September 30, 2013					December 31, 2012
		Shares			Shares		Shares		Shares
		Authorized			Issued and		Authorized		Issued and
					Outstanding				Outstanding
	Stockholders’ equity:
	Class A common stock, $0.000001 par value		200,000,000			53,573,297		200,000,000		23,380,283
	Class B common stock, $0.000001 par value		100,000,000			12,400,324		100,000,000		40,124,986
	Common stock, $0.000001 par value		200,000,000			—		200,000,000		—
	Undesignated Preferred Stock		10,000,000			—		10,000,000		—
	Equity Incentive Plans
	The Company has outstanding awards under three equity incentive plans: the Amended and Restated 2005 Equity Incentive Plan (the “2005 Plan”), the 2011 Equity Incentive Plan (the “2011 Plan”) and the 2012 Equity Incentive Plan, as amended (the “2012 Plan”). In July 2011, the Company terminated the 2005 Plan and provided that no further stock awards were to be granted under the 2005 Plan. All outstanding stock awards under the 2005 Plan will continue to be governed by their existing terms. Upon the effectiveness of the underwriting agreement in connection with the IPO, all shares that were reserved under the 2011 Plan but not issued were assumed by the 2012 Plan. No further awards will be granted pursuant to the 2011 Plan. All outstanding stock awards under the 2011 Plan will continue to be governed by their existing terms. Under the 2012 Plan, the Company has the ability to issue incentive stock options (“ISOs”), non-statutory stock options (“NSOs”), stock appreciation rights, restricted stock awards (“RSAs”), restricted stock units (“RSUs”), performance units and/or performance shares. Additionally, the 2012 Plan provides for the grant of performance cash awards to employees, directors and consultants.
	Restricted Stock Awards and Restricted Stock Units
	The Company began granting RSAs to its employees in July 2011. In March 2012, the Company began granting RSUs. The cost of the RSAs and RSUs are determined using the fair value of the Company’s common stock on the date of grant. Stock-based compensation expense is amortized on a straight-line basis over the requisite service period. RSAs and RSUs generally vest over a four-year period with 25% vesting at the end of one year and the remaining vesting quarterly or annually thereafter.
	The Company granted zero RSAs and 120,438 RSUs during the three months ended September 30, 2013, and zero RSAs and 184,563 RSUs during the nine months ended September 30, 2013. The Company recorded stock-based compensation expense related to RSAs and RSUs of approximately $0.7 million and $0.1 million for the three months ended September 30, 2013 and 2012, respectively, and $1.7 million and $0.3 million for the nine months ended September 30, 2013 and 2012, respectively. As of September 30, 2013, the Company had approximately $10.2 million of unrecognized stock-based compensation expense, net of estimated forfeitures, related to RSAs and RSUs, which will be recognized over the remaining weighted-average vesting period of approximately 2.50 years.
	Stock Options
	Stock options granted under the 2012 Plan will be granted at a price per share not less than the fair value at date of grant. Options granted to date generally vest either over a four-year period with 25% vesting at the end of one year and the remaining vesting monthly thereafter or over a four-year period with 10% vesting over the first year, 20% vesting over the second year, 30% vesting over the third year and 40% vesting over the fourth year. Options granted generally are exercisable for up to 10 years. A summary of stock option activity for the nine months ended September 30, 2013, is as follows:
		Options Outstanding
		Number of			Weighted-		Weighted-		Aggregate
		Shares			Average		Average		Intrinsic
					Exercise		Remaining		Value
					Price		Contractual		(in thousands)
							Term (in
							years)
	Outstanding – January 1 , 2013		10,113,176		$	10		7.89	$	96,992
	Granted		4,224,002			28.06
	Exercised		(2,212,811	)		4.38
	Canceled		(669,709	)		19.7
	Outstanding – September 30, 2013		11,454,658		$	17.18		8.35	$	561,268
	Options vested and expected to vest as of September 30, 2013		11,111,350		$	16.97		8.33	$	546,790
	Options vested and exercisable as of September 30, 2013		3,772,662		$	8.53		7.29	$	217,501
	Aggregate intrinsic value represents the difference between the closing price of the Company’s Class A common stock on the New York Stock Exchange on September 30, 2013 of $66.18 and the exercise price of outstanding, in-the-money options. The total intrinsic value of options exercised was approximately $30.7 million and $22.5 million for the three months ended September 30, 2013 and 2012, respectively, and $65.5 million and $25.1 million for the nine months ended September 30, 2013 and 2012, respectively. The weighted-average grant date fair value of options granted was $30.36 and $13.09 per share for the three months ended September 30, 2013 and 2012, respectively, and $15.86 and $10.72 per share for the nine months ended September 30, 2013 and 2012, respectively.
	As of September 30, 2013, total unrecognized compensation costs, adjusted for estimated forfeitures, related to unvested stock options was approximately $79.9 million, which is expected to be recognized over a weighted-average time period of 2.93 years.
	Employee Stock Purchase Plan
	Concurrent with the effectiveness of the underwriting agreement in connection with the IPO on March 1, 2012, the Company’s 2012 Employee Stock Purchase Plan (the “ESPP”) became effective. The ESPP allows eligible employees to purchase shares of the Company’s Class A common stock at a discount through payroll deductions of up to 15% of their eligible compensation, subject to any plan limitations during designated offering periods. At the end of each offering period, employees are able to purchase shares at 85% of the lower of the fair market value of the Company’s Class A common stock on the first trading day of the offering period or on the last day of the offering period. The Company initiated an offering under the ESPP on June 3, 2013 with an offering end date of November 29, 2013. There were no shares purchased by employees under the ESPP for the three and nine months ended September 30, 2013. The Company recognized $0.3 million and $0.4 million of stock-based compensation related to the ESPP in the three and nine months ended September 30, 2013, respectively.
	Stock-Based Compensation
	The following table summarizes the effects of stock-based compensation related to stock-based awards in the condensed consolidated statements of operations during the periods presented (in thousands):
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2013			2012		2013		2012
	Stock-based compensation effects in loss before income taxes:
	Cost of revenue	$	104		$	27	$	281	$	85
	Sales and marketing		2,660			1,152		6,930		3,171
	Product development		1,709			466		3,565		1,009
	General and administrative		2,542			689		6,557		7,356
	Restructuring and integration		—			—		555		—
	Total stock-based compensation	$	7,015		$	2,334	$	17,888	$	11,621
	During the three and nine months ended September 30, 2013, the Company recognized zero and $0.6 million of stock-based compensation, respectively, related to the acceleration of vesting of RSUs associated with the Qype restructuring plan described in Note 3. During the three and nine months ended September 30, 2012, the Company recognized zero and $5.5 million of stock-based compensation, respectively, related to the acceleration of vesting of stock options held by two executive officers related to the completion of the IPO, included in general and administrative expense. The Company capitalized stock-based compensation as website development costs of $152,000 and $72,000 in the three months ended September 30, 2013 and 2012, respectively, and $383,000 and $209,000 in the nine months ended September 30, 2013 and 2012, respectively.

NET_LOSS_PER_SHARE

NET LOSS PER SHARE	9 Months Ended
	Sep. 30, 2013
NET LOSS PER SHARE	11. NET LOSS PER SHARE
	Basic and diluted net income (loss) per share attributable to common stockholders are presented in conformity with the “two-class method” required for participating securities. Immediately prior to the consummation of the IPO in March 2012, all outstanding shares of preferred stock and common stock were converted to Class B common stock. As a result, shares of Class A and Class B common stock are the only outstanding equity in the Company. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion. Each share of Class A common stock is entitled to one vote per share and each class of Class B common stock is entitled to 10 votes per share. Shares of Class B common stock may be converted into Class A common stock on a share-for-share basis at any time at the option of the stockholder, and are automatically converted into Class A common stock upon sale or transfer, subject to certain limited exceptions, or upon the election of the holder or in connection with certain other conversion events.
	The Company’s weighted-average unvested shares subject to repurchase and settlement in shares of common stock upon vesting have the non-forfeitable right to receive dividends on an equal basis with common stock and therefore are considered participating securities that must be included in the calculation of net loss per share using the two-class method in all presented periods.
	The following table presents the calculation of basic and diluted net income (loss) per share (in thousands, except share and per share data):
		Three Months Ended September 30,
		2013						2012
		Class A			Class B			Class A			Class B
	Net loss	$	(1,623	)	$	(699	)	$	(345	)	$	(1,666	)
	Add: accretion of redeemable convertible preferred stock		—			—			—			—
	Net loss attributable to common stockholders	$	(1,623	)	$	(699	)	$	(345	)	$	(1,666	)
	Basic shares:
	Weighted-average common shares outstanding		45,802			19,728			10,500			50,767
	Diluted shares:
	Weighted-average shares used to compute diluted net loss per share		45,802			19,728			10,500			50,767
	Net loss per share attributable to common stockholders:
	Basic	$	(0.04	)	$	(0.04	)	$	(0.03	)	$	(0.03	)
	Diluted	$	(0.04	)	$	(0.04	)	$	(0.03	)	$	(0.03	)
		Nine Months Ended September 30,
		2013						2012
		Class A			Class B			Class A			Class B
	Net loss	$	(4,414	)	$	(3,585	)	$	(1,930	)	$	(11,865	)
	Add: accretion of redeemable convertible preferred stock		—			—			(4	)		(27	)
	Net loss attributable to common stockholders	$	(4,414	)	$	(3,585	)	$	(1,934	)	$	(11,892	)
	Basic shares:
	Weighted-average common shares outstanding		35,656			28,964			7,157			44,019
	Diluted shares:
	Weighted-average shares used to compute diluted net loss per share		35,656			28,964			7,157			44,019
	Net loss per share attributable to common stockholders:
	Basic	$	(0.12	)	$	(0.12	)	$	(0.27	)	$	(0.27	)
	Diluted	$	(0.12	)	$	(0.12	)	$	(0.27	)	$	(0.27	)
	The following share-based instruments were excluded from the calculation of diluted net income (loss) per share because their effect would have been anti-dilutive for the periods presented (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Stock options		11,455			9,436			11,455			9,436
	Restricted stock units		369			4			369			4
	Restricted stock awards		88			130			88			130
	Employee stock purchase plan		54			—			54			—

INCOME_TAXES

INCOME TAXES	9 Months Ended
	Sep. 30, 2013
INCOME TAXES	12. INCOME TAXES
	The Company is subject to income tax in the United States as well as other tax jurisdictions in which it conducts business. Earnings from non-U.S. activities are subject to local country income tax. The Company does not provide for federal income taxes on the undistributed earnings of its foreign subsidiaries as such earnings are to be reinvested indefinitely.
	The Company recorded an income tax provision of $510,000 and $45,000 for the three months ended September 30, 2013 and 2012, respectively, and $786,000 and $142,000 for the nine months ended September 30, 2013 and 2012, respectively, related to foreign income taxes and state minimum taxes. Based on the available objective evidence during the nine months ended September 30, 2013, management believes it is more likely than not that the tax benefits of the U.S. losses incurred during the nine months ended September 30, 2013 may not be realized by the end of the 2013 fiscal year. Accordingly, the Company did not record the tax benefits of the U.S. losses incurred during the nine months ended September 30, 2013. The primary difference between the effective tax rate and the federal statutory tax rate relates to the valuation allowances on the Company’s net operating losses, foreign tax rate differences, meals and entertainment and non-deductible stock-based compensation expense.
	As of September 30, 2013, the total amount of gross unrecognized tax benefits was $1.1 million, $0.2 million of which would affect our effective tax rate if recognized. As of September 30, 2013, the Company had an immaterial amount related to the accrual of interest and penalties. During the three months ended September 30, 2013, the Company’s gross unrecognized tax benefits increased by $0.2 million, $0.1 million of which would affect our effective tax rate if recognized. The Company does not have any tax positions as of September 30, 2013 for which it is reasonably possible that the total amount of gross unrecognized tax benefits will significantly increase or decrease within the next 12 months.

INFORMATION_ABOUT_REVENUE_AND_

INFORMATION ABOUT REVENUE AND GEOGRAPHIC AREAS	9 Months Ended
	Sep. 30, 2013
INFORMATION ABOUT REVENUE AND GEOGRAPHIC AREAS	13. INFORMATION ABOUT REVENUE AND GEOGRAPHIC AREAS
	The Company considers operating segments to be components of the Company in which separate financial information is available that is evaluated regularly by the Company’s chief operating decision maker in deciding how to allocate resources and in assessing performance. The chief operating decision maker for the Company is the Chief Executive Officer. The Chief Executive Officer reviews financial information presented on a consolidated basis, accompanied by information about revenue by product line and geographic region for purposes of allocating resources and evaluating financial performance.
	The Company has one business activity and there are no segment managers who are held accountable for operations, operating results or plans for levels or components below the consolidated unit level. Accordingly, the Company has determined that it has a single operating and reporting segment.
	Revenue by geography is based on the billing address of the customer. The following tables present the Company’s net revenue by product line, as well as revenue and long-lived assets by geographic region for the periods presented (each in thousands):
	Net Revenue
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Net revenue by product:
	Local advertising	$	51,167	$	28,485	$	134,932	$	75,214
	Brand advertising		6,910		5,886		18,715		15,583
	Other services		3,104		2,000		8,690		5,613
	Total net revenue	$	61,181	$	36,371	$	162,337	$	96,410
	During the three and nine months ended September 30, 2013 and 2012, a substantial majority of the Company’s revenue was generated in the United States. In addition, no individual customer accounted for 10% or more of consolidated net revenue in either period.
	Long-Lived Assets
		September 30,		December 31,
		2013		2012
	United States	$	24,839	$	14,275
	All Other Countries		1,522		702
	Total long-lived assets	$	26,361	$	14,977

DESCRIPTION_OF_BUSINESS_AND_BA1

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Policies)	9 Months Ended
	Sep. 30, 2013
Basis of Presentation	Basis of Presentation
	The accompanying condensed consolidated financial statements are unaudited. These unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and applicable rules and regulations of the U.S. 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 consolidated financial statements contained in the Company’s Annual Report on Form 10-K filed with the SEC on February 27, 2013 (the “Annual Report”). The condensed consolidated balance sheet as of December 31, 2012 included herein was derived from the audited consolidated financial statements as of that date but does not include all disclosures required by GAAP, including notes to the financial statements.
	The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, include all adjustments of a normal recurring nature necessary for the fair presentation of the interim periods presented.
Significant Accounting Policies	Significant Accounting Policies
	There have been no material changes to our significant accounting policies, as compared to the significant accounting policies described in the Annual Report.
	Effective January 1, 2013, the Company prospectively adopted Accounting Standards Update (“ASU”) 2013-02, “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” This update requires companies to provide information regarding the amounts reclassified out of accumulated other comprehensive income by component. In addition, companies are required to present, either on the face of the statement where net income (loss) is presented or in the accompanying notes, significant amounts reclassified out of accumulated other comprehensive income (loss) by the respective line items of net income (loss). The adoption of ASU 2013-02 did not have a material impact on the Company’s consolidated financial statements.
	Effective July 1, 2013, the Company prospectively adopted ASU 2013-11, “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the Financial Accounting Standards Board Emerging Issues Task Force).” This update eliminates diversity in practice for presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is available to reduce the taxable income or tax payable that would result from disallowance of a tax position. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements.
Principles of Consolidation	Principles of Consolidation
	These condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates
	The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of income and expenses during the reporting period. These estimates are based on information available as of the date of the condensed consolidated financial statements; therefore, actual results could differ from management’s estimates.

FAIR_VALUE_OF_FINANCIAL_INSTRU1

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value, Assets Measured on Recurring Basis	The following table represents the Company’s financial instruments measured at fair value as of September 30, 2013 and December 31, 2012 (in thousands):
			September 30, 2013								December 31, 2012
			Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
	Money market funds(1)		$	83,286	$	—	$	—	$	83,286	$	87,262	$	—	$	—	$	87,262
	-1	Included in cash and cash equivalents on the condensed consolidated balance sheets.

ACQUISITIONS_Tables

ACQUISITIONS (Tables)	9 Months Ended
	Sep. 30, 2013
Consideration Paid and Allocation of Purchase Price	The following table summarizes the consideration paid for SeatMe and the allocation of the purchase price, based on the estimated fair value of the assets acquired and liabilities assumed at the acquisition date (in thousands):
		July 24, 2013
	Fair value of purchase consideration:
	Cash:
	Distributed to SeatMe equity holders	$	2,057
	Held in escrow account		56
	Class A common stock:
	Distributed to SeatMe equity holders		8,420
	Held in escrow account		1,246
	Total purchase consideration	$	11,779
	Fair value of net assets acquired:
	Cash and Cash Equivalents	$	56
	Property and equipment		47
	Intangibles		1,440
	Goodwill		10,279
	Other assets		117
	Total assets acquired		11,939
	Total liabilities assumed		160
	Net assets acquired	$	11,779
Estimated Useful Lives of Intangible Assets Acquired	Estimated useful lives of the intangible assets acquired are shown below:
	Intangible Type	Useful Life
	Developed technology		6 years
	Customer relationships		2 years
	Trade name		2 years
	Weighted average		5.6 years
Business Acquisition, Pro Forma Information	The unaudited pro forma financial information, as presented below, is for informational purposes only and is not necessarily indicative of the results of operations that would have been achieved if the acquisition had taken place as of January 1, 2012 (in thousands, except per share data):
		Pro Forma
		Three Months Ended			Nine Months Ended
		September 30, 2012			September 30, 2012
	Revenue	$	39,810		$	104,546
	Net loss	$	(1,049	)	$	(18,160	)
	Basic and diluted net loss per share attributable to common stockholders	$	(0.02	)	$	(0.35	)
Schedule of Restructuring and Related Costs	The following table summarizes the changes in the Company’s restructuring liabilities (in thousands):
	Balance as of December 31, 2012	$	685
	Provision		935
	Payments		(1,304	)
	Adjustment to prior provision		(261	)
	Balance as of September 30, 2013	$	55

CASH_AND_CASH_EQUIVALENTS_Tabl

CASH AND CASH EQUIVALENTS (Tables)	9 Months Ended
	Sep. 30, 2013
Schedule of Cash and Cash Equivalents	Cash and cash equivalents as of September 30, 2013 and December 31, 2012 consist of the following (in thousands):
		September 30,		December 31,
		2013		2012
	Cash and cash equivalents
	Cash	$	17,928	$	7,862
	Money market funds		83,286		87,262
	Total cash and cash equivalents	$	101,214	$	95,124

PROPERTY_EQUIPMENT_AND_SOFTWAR1

PROPERTY, EQUIPMENT AND SOFTWARE, NET (Tables)	9 Months Ended
	Sep. 30, 2013
Property, Equipment and Software, Net	Property, equipment and software, net as of September 30, 2013 and December 31, 2012 consist of the following (in thousands):
		September 30,			December 31,
		2013			2012
	Computer equipment	$	11,559		$	8,315
	Software		458			433
	Capitalized website and internal-use software development costs		12,119			8,653
	Furniture and fixtures		3,525			2,613
	Leasehold improvements		11,592			5,017
	Telecommunication		1,909			1,570
	Total		41,162			26,601
	Less accumulated depreciation		(15,241	)		(11,802	)
	Property, equipment and software, net	$	25,921		$	14,799

GOODWILL_AND_INTANGIBLE_ASSETS1

GOODWILL AND INTANGIBLE ASSETS (Tables)	9 Months Ended
	Sep. 30, 2013
Schedule of Goodwill	The changes in the carrying amount of goodwill for the nine months ended September 30, 2013 were as follows (in thousands):
	Balance as of December 31, 2012	$	48,605
	Goodwill acquired		10,279
	Measurement period adjustment		(1,153	)
	Effect of currency translation		1,083
	Balance as of September 30, 2013	$	58,814
Schedule of Finite-Lived Intangible Assets	The intangible assets detail at September 30, 2013 and December 31, 2012 consist of the following (dollars in thousands):
										Weighted
		Gross						Net		Average
		Carrying			Accumulated			Carrying		Remaining
		Amount			Amortization			Amount		Life
	September 30, 2013:
	Content	$	3,346		$	(719	)	$	2,627		4.1 years
	Advertiser relationships		2,005			(859	)		1,146		1.1 years
	Developed technology		1,843			(292	)		1,551		5.0 years
	Trade name and other		546			(203	)		343		1.4 years
	Domains		250			(145	)		105		4.0 years
		$	7,990		$	(2,218	)	$	5,772
										Weighted
		Gross						Net		Average
		Carrying			Accumulated			Carrying		Remaining
		Amount			Amortization			Amount		Life
	December 31, 2012:
	Content	$	3,304		$	(126	)	$	3,178		4.8 years
	Advertiser relationships		1,982			(188	)		1,794		1.8 years
	Developed technology		529			(51	)		478		1.8 years
	Trade name and other		396			(38	)		358		1.8 years
	Domains		246			(118	)		128		4.6 years
		$	6,457		$	(521	)	$	5,936
Schedule Of Intangible Assets Future Amortization Expense	As of September 30, 2013, the estimated future amortization of purchased intangible assets for (i) the remaining three months of 2013, (ii) each of the succeeding four years and (iii) the succeeding fifth year and thereafter are as follows (in thousands):
	Year Ending December 31,	Amount
	2013 (from October 1, 2013)	$	631
	2014		2,229
	2015		922
	2016		880
	2017		758
	2018 and thereafter		352
	Total amortization	$	5,772

ACCRUED_LIABILITIES_Tables

ACCRUED LIABILITIES (Tables)	9 Months Ended
	Sep. 30, 2013
Schedule of Accrued Liabilities	Accrued liabilities as of September 30, 2013 and December 31, 2012 consist of the following (in thousands):
		September 30,		December 31,
		2013		2012
	Accrued vacation and employee related expenses	$	4,870	$	2,463
	Accrued commissions		2,918		2,037
	Deferred rent		1,784		1,755
	Legal settlement accrual		—		2,167
	Accrued value added taxes payable		978		1,260
	Accrued payroll tax		1,271		845
	Merchant revenue share liability		689		538
	Accrued restructuring and integration		55		710
	Fixed asset purchase commitments		3,878		383
	Other accrued expenses		5,597		4,209
	Total	$	22,040	$	16,367

OTHER_INCOME_EXPENSE_NET_Table

OTHER INCOME (EXPENSE), NET (Tables)	9 Months Ended
	Sep. 30, 2013
Schedule of Nonoperating Income (Expense)	Other income (expense), net for the three and nine months ended September 30, 2013 and 2012 consists of the following (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Interest income	$	11		$	16		$	41		$	34
	Transaction gain (loss) on foreign exchange		50			(20	)		(173	)		(29	)
	Other non-operating income (loss), net		(92	)		(10	)		(166	)		(28	)
	Other income (expense), net	$	(31	)	$	(14	)	$	(298	)	$	(23	)

STOCKHOLDERS_EQUITY_Tables

STOCKHOLDERS' EQUITY (Tables)	9 Months Ended
	Sep. 30, 2013
Schedule of Stockholders' Equity	The following table presents the shares authorized and issued and outstanding as of the periods presented (in thousands, except share data):
		September 30, 2013					December 31, 2012
		Shares			Shares		Shares		Shares
		Authorized			Issued and		Authorized		Issued and
					Outstanding				Outstanding
	Stockholders’ equity:
	Class A common stock, $0.000001 par value		200,000,000			53,573,297		200,000,000		23,380,283
	Class B common stock, $0.000001 par value		100,000,000			12,400,324		100,000,000		40,124,986
	Common stock, $0.000001 par value		200,000,000			—		200,000,000		—
	Undesignated Preferred Stock		10,000,000			—		10,000,000		—
Schedule of Stock Option Activity	A summary of stock option activity for the nine months ended September 30, 2013, is as follows:
		Options Outstanding
		Number of			Weighted-		Weighted-		Aggregate
		Shares			Average		Average		Intrinsic
					Exercise		Remaining		Value
					Price		Contractual		(in thousands)
							Term (in
							years)
	Outstanding – January 1 , 2013		10,113,176		$	10		7.89	$	96,992
	Granted		4,224,002			28.06
	Exercised		(2,212,811	)		4.38
	Canceled		(669,709	)		19.7
	Outstanding – September 30, 2013		11,454,658		$	17.18		8.35	$	561,268
	Options vested and expected to vest as of September 30, 2013		11,111,350		$	16.97		8.33	$	546,790
	Options vested and exercisable as of September 30, 2013		3,772,662		$	8.53		7.29	$	217,501
Schedule of Stock-based Compensation	The following table summarizes the effects of stock-based compensation related to stock-based awards in the condensed consolidated statements of operations during the periods presented (in thousands):
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2013			2012		2013		2012
	Stock-based compensation effects in loss before income taxes:
	Cost of revenue	$	104		$	27	$	281	$	85
	Sales and marketing		2,660			1,152		6,930		3,171
	Product development		1,709			466		3,565		1,009
	General and administrative		2,542			689		6,557		7,356
	Restructuring and integration		—			—		555		—
	Total stock-based compensation	$	7,015		$	2,334	$	17,888	$	11,621

NET_LOSS_PER_SHARE_Tables

NET LOSS PER SHARE (Tables)	9 Months Ended
	Sep. 30, 2013
Schedule of Earnings Per Share, Basic and Diluted	The following table presents the calculation of basic and diluted net income (loss) per share (in thousands, except share and per share data):
		Three Months Ended September 30,
		2013						2012
		Class A			Class B			Class A			Class B
	Net loss	$	(1,623	)	$	(699	)	$	(345	)	$	(1,666	)
	Add: accretion of redeemable convertible preferred stock		—			—			—			—
	Net loss attributable to common stockholders	$	(1,623	)	$	(699	)	$	(345	)	$	(1,666	)
	Basic shares:
	Weighted-average common shares outstanding		45,802			19,728			10,500			50,767
	Diluted shares:
	Weighted-average shares used to compute diluted net loss per share		45,802			19,728			10,500			50,767
	Net loss per share attributable to common stockholders:
	Basic	$	(0.04	)	$	(0.04	)	$	(0.03	)	$	(0.03	)
	Diluted	$	(0.04	)	$	(0.04	)	$	(0.03	)	$	(0.03	)
		Nine Months Ended September 30,
		2013						2012
		Class A			Class B			Class A			Class B
	Net loss	$	(4,414	)	$	(3,585	)	$	(1,930	)	$	(11,865	)
	Add: accretion of redeemable convertible preferred stock		—			—			(4	)		(27	)
	Net loss attributable to common stockholders	$	(4,414	)	$	(3,585	)	$	(1,934	)	$	(11,892	)
	Basic shares:
	Weighted-average common shares outstanding		35,656			28,964			7,157			44,019
	Diluted shares:
	Weighted-average shares used to compute diluted net loss per share		35,656			28,964			7,157			44,019
	Net loss per share attributable to common stockholders:
	Basic	$	(0.12	)	$	(0.12	)	$	(0.27	)	$	(0.27	)
	Diluted	$	(0.12	)	$	(0.12	)	$	(0.27	)	$	(0.27	)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following share-based instruments were excluded from the calculation of diluted net income (loss) per share because their effect would have been anti-dilutive for the periods presented (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Stock options		11,455			9,436			11,455			9,436
	Restricted stock units		369			4			369			4
	Restricted stock awards		88			130			88			130
	Employee stock purchase plan		54			—			54			—

INFORMATION_ABOUT_REVENUE_AND_1

INFORMATION ABOUT REVENUE AND GEOGRAPHIC AREAS (Tables)	9 Months Ended
	Sep. 30, 2013
Schedule of Net Revenue by Product	The following tables present the Company’s net revenue by product line, as well as revenue and long-lived assets by geographic region for the periods presented (each in thousands):
	Net Revenue
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Net revenue by product:
	Local advertising	$	51,167	$	28,485	$	134,932	$	75,214
	Brand advertising		6,910		5,886		18,715		15,583
	Other services		3,104		2,000		8,690		5,613
	Total net revenue	$	61,181	$	36,371	$	162,337	$	96,410
Schedule of Long-Lived Assets by Geographic Area	During the three and nine months ended September 30, 2013 and 2012, a substantial majority of the Company’s revenue was generated in the United States. In addition, no individual customer accounted for 10% or more of consolidated net revenue in either period.
	Long-Lived Assets
		September 30,		December 31,
		2013		2012
	United States	$	24,839	$	14,275
	All Other Countries		1,522		702
	Total long-lived assets	$	26,361	$	14,977

FAIR_VALUE_OF_FINANCIAL_INSTRU2

FAIR VALUE OF FINANCIAL INSTRUMENTS (Detail) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$83,286	[1]	$87,262	[1]
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	83,286	[1]	87,262	[1]
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds		[1]		[1]
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds		[1]		[1]
[1]	Included in cash and cash equivalents on the condensed consolidated balance sheets.

ACQUISITION_Additional_Informa

ACQUISITION - Additional Information (Detail) (USD $)	9 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Jul. 24, 2013	Sep. 30, 2013	Sep. 30, 2013	Oct. 23, 2012	Sep. 30, 2013
			SeatMe, Inc. [Member]	SeatMe, Inc. [Member]	SeatMe, Inc. [Member]	Qype [Member]	Qype [Member]
ACQUISITION [Abstract]
Business acquisition consideration paid, cash			$2,200,000
Business acquisition consideration paid, common stock			260,901
Business acquisition consideration paid, value of common stock			9,700,000			23,300,000
Business acquisition consideration paid, cash held in escrow			56,000			10,300,000	9,400,000
Business acquisition consideration paid, shares held in escrow			31,236
Business combination acquisition related costs				200,000	200,000
Consideration transferred			11,779,000			24,300,000
Restructuring reserve	55,000	685,000					100,000
Restructuring charges	$935,000						$1,900,000

Consideration_and_Purchase_Pri

Consideration and Purchase Price Allocation Based on Estimated Fair Value of Assets and Liabilities Assumed (Detail) (USD $)	9 Months Ended		1 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Jul. 24, 2013
			SeatMe, Inc. [Member]
Fair value of purchase consideration:
Cash consideration	$2,057		$2,057
Cash in escrow account			56
Fair value of Class A common stock			8,420
Fair value of Class A common stock in escrow account			1,246
Total purchase consideration			11,779
Fair value of net assets acquired:
Cash and Cash Equivalents			56
Property and equipment			47
Intangibles			1,440
Goodwill	58,814	48,605	10,279
Other assets			117
Total assets acquired			11,939
Total liabilities assumed			160
Net assets acquired			$11,779

Summary_of_Estimated_Useful_Li

Summary of Estimated Useful Lives of Intangible Assets Acquired (Detail) (SeatMe, Inc. [Member])	1 Months Ended
	Jul. 24, 2013
Acquired Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	5 years 7 months 6 days
Developed technology [Member]
Acquired Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	6 years
Customer Relationship [Member]
Acquired Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	2 years
Trade name [Member]
Acquired Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	2 years

Schedule_of_Pro_Forma_Results_

Schedule of Pro Forma Results (Detail) (USD $)	3 Months Ended	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2012
ACQUISITION [Abstract]
Revenue	$39,810	$104,546
Net loss	($1,049)	($18,160)
Basic and diluted net loss per share attributable to common stockholders	($0.02)	($0.35)

Schedule_of_Restructuring_and_

Schedule of Restructuring and Related Costs (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
ACQUISITION [Abstract]
Beginning balance	$685
Provision	935
Payments	-1,304
Adjustment to prior provision	-261
Ending balance	$55

Schedule_of_Cash_and_Cash_Equi

Schedule of Cash and Cash Equivalents (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
CASH AND CASH EQUIVALENTS [Abstract]
Cash	$17,928	$7,862
Money market funds	83,286	87,262
Total cash and cash equivalents	$101,214	$95,124	$123,083	$21,736

CASH_AND_CASH_EQUIVALENTS_Addi

CASH AND CASH EQUIVALENTS - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
CASH AND CASH EQUIVALENTS [Abstract]
Letters of credit	$8.20	$6.40

PROPERTY_EQUIPMENT_AND_SOFTWAR2

PROPERTY, EQUIPMENT AND SOFTWARE, NET (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property, equipment and software, gross	$41,162	$26,601
Less accumulated depreciation	-15,241	-11,802
Property, equipment and software, net	25,921	14,799
Computer Equipment [Member]
Property, equipment and software, gross	11,559	8,315
Software [Member]
Property, equipment and software, gross	458	433
Capitalized website and internal-use software development costs [Member]
Property, equipment and software, gross	12,119	8,653
Furniture and Fixtures [Member]
Property, equipment and software, gross	3,525	2,613
Leasehold Improvements [Member]
Property, equipment and software, gross	11,592	5,017
Telecommunication [Member]
Property, equipment and software, gross	$1,909	$1,570

PROPERTY_EQUIPMENT_AND_SOFTWAR3

PROPERTY, EQUIPMENT AND SOFTWARE, NET - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Property, Plant and Equipment [Line Items]
Depreciation expense	$1.90	$1.50	$5.30	$4

Schedule_of_Goodwill_Detail

Schedule of Goodwill (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
GOODWILL AND INTANGIBLE ASSETS [Abstract]
Beginning balance	$48,605
Goodwill acquired	10,279
Measurement period adjustment	-1,153
Effect of currency translation	1,083
Ending balance	$58,814

GOODWILL_AND_INTANGIBLE_ASSETS2

GOODWILL AND INTANGIBLE ASSETS - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2013
	USD ($)	USD ($)	USD ($)	USD ($)	Qype [Member]	Qype [Member]
					USD ($)	EUR (€)
Indefinite-lived Intangible Assets [Line Items]
Purchase price adjustment			($1,153,000)		$1,200,000	€ 900,000
GOODWILL AND INTANGIBLE ASSETS [Abstract]
Amortization expense	$600,000	$0	$1,600,000	$0

Schedule_of_Finitelived_Intang

Schedule of Finite-lived Intangible Assets (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$7,990	$6,457
Accumulated Amortization	-2,218	-521
Total amortization	5,772	5,936
Content [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,346	3,304
Accumulated Amortization	-719	-126
Total amortization	2,627	3,178
Weighted Average Remaining Life	4 years 1 month 6 days	4 years 9 months 18 days
Advertiser relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,005	1,982
Accumulated Amortization	-859	-188
Total amortization	1,146	1,794
Weighted Average Remaining Life	1 year 1 month 6 days	1 year 9 months 18 days
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,843	529
Accumulated Amortization	-292	-51
Total amortization	1,551	478
Weighted Average Remaining Life	5 years	1 year 9 months 18 days
Trade name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	546	396
Accumulated Amortization	-203	-38
Total amortization	343	358
Weighted Average Remaining Life	1 year 4 months 24 days	1 year 9 months 18 days
Domain [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	250	246
Accumulated Amortization	-145	-118
Total amortization	$105	$128
Weighted Average Remaining Life	4 years	4 years 7 months 6 days

Schedule_Of_Intangible_Assets_

Schedule Of Intangible Assets Future Amortization Expense (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
GOODWILL AND INTANGIBLE ASSETS [Abstract]
2013	$631
2014	2,229
2015	922
2016	880
2017	758
2018 and thereafter	352
Total amortization	$5,772	$5,936

ACCRUED_LIABILITIES_Detail

ACCRUED LIABILITIES (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Payables and Accruals [Abstract]
Accrued vacation and employee related expenses	$4,870	$2,463
Accrued commissions	2,918	2,037
Deferred rent	1,784	1,755
Legal settlement accrual		2,167
Accrued value added taxes payable	978	1,260
Accrued payroll tax	1,271	845
Merchant revenue share liability	689	538
Accrued restructuring and integration	55	710
Fixed asset purchase commitments	3,878	383
Other accrued expenses	5,597	4,209
Total	$22,040	$16,367

OTHER_INCOME_EXPENSE_NET_Detai

OTHER INCOME (EXPENSE), NET (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Income and Expenses [Abstract]
Interest income	$11	$16	$41	$34
Transaction gain (loss) on foreign exchange	50	-20	-173	-29
Other non-operating income (loss), net	-92	-10	-166	-28
Other income (expense), net	($31)	($14)	($298)	($23)

COMMITMENTS_AND_CONTINGENCIES_

COMMITMENTS AND CONTINGENCIES - Additional Information (Detail)	3 Months Ended			9 Months Ended				1 Months Ended	12 Months Ended
	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2010	Aug. 13, 2013	Dec. 31, 2012	Dec. 31, 2010
	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	Qype [Member]	Qype [Member]	Qype [Member]
								EUR (€)	EUR (€)	EUR (€)
COMMITMENTS AND CONTINGENCIES [Abstract]
Rental expense	$2,300,000		$1,100,000	$5,500,000	$3,000,000
Litigation settlement		800,000
Payments for legal settlement		800,000
Litigation accrual						800,000	1,300,000
Damages sought								€ 441,900	€ 118,400	€ 1,500,000

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

1 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Mar. 31, 2012

Mar. 31, 2012

Mar. 31, 2012

Restricted Stock [Member]

Restricted Stock Unit [Member]

Restricted Stock Unit [Member]

Restricted Stock Unit [Member]

Restricted Stock Unit [Member]

Restricted Stock Awards [Member]

Restricted Stock Awards [Member]

Restricted Stock Awards [Member]

Restricted Stock Awards [Member]

Stock Options [Member]

Stock Options [Member]

Stock Options [Member]

Stock Options [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Accelerated Vesting [Member]

Accelerated Vesting [Member]

Accelerated Vesting [Member]

Accelerated Vesting [Member]

Common Class A [Member]

Common Class A [Member]

Common Class B [Member]

Vote

Underwriters [Member]

Vote

Shareholders Equity [Line Items]

Shares issued, issuance one

8,172,500

1,072,500

Shares issued, issuance two

50,000

Share price

$15

Proceeds from IPO, gross

$122,600,000

Proceeds from IPO, net

111,400,000

Conversion of redeemable convertible preferred stock, shares issued

35,816,772

Voting rights

1

10

Vesting period

4 years

4 years

4 years

Percentage vesting, end of year one

25.00%

25.00%

25.00%

Awards granted

120,438

184,563

0

0

Stock-based compensation

7,015,000

2,334,000

17,888,000

11,621,000

700,000

100,000

1,700,000

300,000

700,000

100,000

1,700,000

300,000

300,000

400,000

0

0

600,000

5,500,000

Unrecognized compensation cost

10,200,000

10,200,000

10,200,000

10,200,000

79,900,000

79,900,000

Unrecognized compensation expense, period for recognition

2 years 6 months

2 years 6 months

2 years 11 months 5 days

Percentage vesting, first year

10.00%

Percentage vesting, year two

20.00%

Percentage vesting, year three

30.00%

Percentage vesting, year four

40.00%

Expiration period

10 years

Common Stock closing price

$66.18

$66.18

Options exercised, total intrinsic value

30,700,000

22,500,000

65,500,000

25,100,000

Options granted, grant date fair value

$30.36

$13.09

$15.86

$10.72

Maximum employee subscription rate

15.00%

15.00%

Market discount rate

85.00%

Capitalized website development costs

$152,000

$72,000

$383,000

$209,000

Schedule_of_Shares_by_Type_Det

Schedule of Shares by Type (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Common stock, shares authorized	500,000,000	500,000,000
Common stock, par value per share	$0.00	$0.00
Undesignated Preferred Stock, Shares Authorized	10,000,000	10,000,000
Common stock, shares issued	65,973,621	63,505,269
Common stock, Shares Outstanding	65,973,621	63,505,269
Undesignated Preferred Stock, Shares Issued
Undesignated Preferred Stock, Shares Outstanding
Common Class A [Member]
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Common stock, shares authorized	200,000,000	200,000,000
Common stock, par value per share	$0.00	$0.00
Common stock, shares issued	53,573,297	23,380,283
Common stock, Shares Outstanding	53,573,297	23,380,283
Common Class B [Member]
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Common stock, shares authorized	100,000,000	100,000,000
Common stock, par value per share	$0.00	$0.00
Common stock, shares issued	12,400,324	40,124,986
Common stock, Shares Outstanding	12,400,324	40,124,986
Common Stock [Member]
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Common stock, shares authorized	200,000,000	200,000,000
Common stock, par value per share	$0.00	$0.00

Schedule_of_Stock_Option_Activ

Schedule of Stock Option Activity (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Number of Shares
Outstanding - beginning balance	10,113,176
Granted	4,224,002
Exercised	-2,212,811
Canceled	-669,709
Outstanding - ending balance	11,454,658	10,113,176
Options vested and expected to vest	11,111,350
Options vested and exercisable	3,772,662
Weighted Average Exercise Price
Outstanding - beginning balance	$10
Granted	$28.06
Exercised	$4.38
Canceled	$19.70
Outstanding - ending balance	$17.18	$10
Options vested and expected to vest	$16.97
Options vested and exercisable	$8.53
Weighted Average Remaining Contractual Term, Outstanding	8 years 4 months 6 days	7 years 10 months 21 days
Weighted Average Remaining Contractual Term, Options vested and expected to vest	8 years 3 months 29 days
Weighted Average Remaining Contractual Term, Options vested and exercisable	7 years 3 months 15 days
Aggregate Intrinsic Value
Outstanding - beginning balance	$96,992
Outstanding - ending balance	561,268	96,992
Options vested and expected to vest	546,790
Options vested and exercisable	$217,501

Schedule_of_StockBased_Compens

Schedule of Stock-Based Compensation (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$7,015	$2,334	$17,888	$11,621
Cost of revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	104	27	281	85
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	2,660	1,152	6,930	3,171
Product development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	1,709	466	3,565	1,009
General and administration [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	2,542	689	6,557	7,356
Restructuring and integration [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation			$555

Schedule_Of_Earnings_Per_Share

Schedule Of Earnings Per Share Basic And Diluted (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net loss	($2,322)	($2,011)	($7,999)	($13,795)
Add: accretion of redeemable convertible preferred stock				-31
Net loss attributable to common stockholders	-2,322	-2,011	-7,999	-13,826
Basic shares:
Weighted-average common shares outstanding	65,530	61,267	64,620	51,176
Diluted shares:
Weighted-average shares used to compute diluted net loss per share	65,530	61,267	64,620	51,176
Net loss per share attributable to common stockholders:
Basic	($0.04)	($0.03)	($0.12)	($0.27)
Diluted	($0.04)	($0.03)	($0.12)	($0.27)
Common Class A [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net loss	-1,623	-345	-4,414	-1,930
Add: accretion of redeemable convertible preferred stock				-4
Net loss attributable to common stockholders	-1,623	-345	-4,414	-1,934
Basic shares:
Weighted-average common shares outstanding	45,802	10,500	35,656	7,157
Diluted shares:
Weighted-average shares used to compute diluted net loss per share	45,802	10,500	35,656	7,157
Net loss per share attributable to common stockholders:
Basic	($0.04)	($0.03)	($0.12)	($0.27)
Diluted	($0.04)	($0.03)	($0.12)	($0.27)
Common Class B [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net loss	-699	-1,666	-3,585	-11,865
Add: accretion of redeemable convertible preferred stock				-27
Net loss attributable to common stockholders	($699)	($1,666)	($3,585)	($11,892)
Basic shares:
Weighted-average common shares outstanding	19,728	50,767	28,964	44,019
Diluted shares:
Weighted-average shares used to compute diluted net loss per share	19,728	50,767	28,964	44,019
Net loss per share attributable to common stockholders:
Basic	($0.04)	($0.03)	($0.12)	($0.27)
Diluted	($0.04)	($0.03)	($0.12)	($0.27)

Schedule_of_AntiDilutive_Share

Schedule of Anti-Dilutive Shares (Detail)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock Options [Member]
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]
Employee stock purchase plan	11,455	9,436	11,455	9,436
Restricted Stock Units (RSUs) [Member]
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]
Employee stock purchase plan	369	4	369	4
Restricted Stock [Member]
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]
Employee stock purchase plan	88	130	88	130
Employee Stock Purchase Plan [Member]
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]
Employee stock purchase plan	54		54

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Taxes [Line Items]
Provision for income taxes	$510,000	$45,000	$786,000	$142,000
Gross unrecognized tax benefits	1,100,000		1,100,000
Unrecognized tax benefits that would affect effective tax rate if recognized	100,000		200,000
Unrecognized tax benefits increase	$200,000

Schedule_of_Net_Revenue_by_Pro

Schedule of Net Revenue by Product Line (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net revenue by product:
Net revenue	$61,181	$36,371	$162,337	$96,410
Local Advertising [Member]
Net revenue by product:
Net revenue	51,167	28,485	134,932	75,214
Brand Advertising [Member]
Net revenue by product:
Net revenue	6,910	5,886	18,715	15,583
Other Services [Member]
Net revenue by product:
Net revenue	$3,104	$2,000	$8,690	$5,613

Schedule_of_LongLived_Assets_D

Schedule of Long-Lived Assets (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Segment Reporting Information [Line Items]
Long-lived assets	$26,361	$14,977
United States [Member]
Segment Reporting Information [Line Items]
Long-lived assets	24,839	14,275
All Other Countries [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$1,522	$702