10-Q/A

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q/A

(Amendment No. 1)

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2012

OR

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number: 001-35604

KAYAK SOFTWARE CORPORATION

(Exact name of registrant as specified in its charter)

Delaware	54-2139807
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

55 North Water Street, Suite 1

Norwalk, CT 06854

(Address of principal executive offices, including zip code)

(203) 899-3100

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes¨Nox

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    YesxNo¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer  o	Accelerated Filer o
Non-accelerated filer (Do not check if a smaller reporting company)  x	Smaller reporting company  o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes ¨  Nox

At August 15, 2012, there were 4,577,170 shares of KAYAK's Class A common stock outstanding and 33,937,749 shares of KAYAK's Class B common stock outstanding.

EXPLANATORY NOTE

The purpose of this Amendment No. 1 on Form 10–Q/A to KAYAK Software Corporation’s quarterly report on Form 10–Q for the quarter ended June 30, 2012, filed with the Securities and Exchange Commission on August 24, 2012 (the “Form 10–Q”), is solely to furnish Exhibit 101 to the Form 10–Q in accordance with Rule 405 of Regulation S–T.

No other changes have been made to the Form 10–Q.  This Amendment No. 1 speaks as of the original filing date of the Form 10–Q, does not reflect events that may have occurred subsequent to the original filing date and does not modify or update in any way disclosures made in the original Form 10–Q.

Pursuant to rule 406T of Regulation S–T, the interactive data files on Exhibit 101 hereto are deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and otherwise are not subject to liability under those sections.

Item 6. Exhibits

Exhibit No.	Description
3.1*	Amended and Restated Certificate of Incorporation of the Company as in effect (filed as exhibit 3.9 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)
3.2*	Amended and Restated By-Laws of the Company as in effect (filed as exhibit 3.11 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)
4.1*	Form of Registrant’s Class A Common Stock Certificate (filed as exhibit 4.1 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)
4.2*	Form of Registrant’s Class B Common Stock Certificate (filed as exhibit 4.8 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)
4.3*	Election and Amendment Agreement, dated April 19, 2012, between the Company and the stockholders named therein (filed as exhibit 4.9 to Amendment No. 10 to the Registration Statement on Form S-1 filed on April 20, 2012). (1)
10.1*	2012 Equity Incentive Plan (filed as exhibit 10.3 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.2*	KAYAK Insertion Order: IO10963, dated April 5, 2012, between the Company and Expedia (filed as exhibit 10.14 to Amendment No. 13 to the Registration Statement on Form S-1 filed on July 13, 2012). (1)^
10.3*	Form of Indemnification Agreement between the Company and certain of its directors and executive officers (filed as exhibit 10.59 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.4*	Form of Non-Qualified Stock Option Agreement under the 2012 Equity Incentive Plan (filed as exhibit 10.62 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.5*	Election and Amendment Agreement, dated April 19, 2012, between the Company and the stockholders named therein (included in Exhibit 4.3) (filed as exhibit 4.9 to Amendment No. 10 to the Registration Statement on Form S-1 filed on April 20, 2012). (1)
10.6*	Eighth Amendment, dated May 3, 2012, to the Third Amended and Restated 2005 Equity Incentive Plan (filed as exhibit 10.68 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.7*	Employment and Non-Competition Agreement, dated May 14, 2012, between the Company and Daniel Stephen Hafner, as amended by First Amendment, dated May 17, 2012 (filed as exhibit 10.69 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.8*	Employment and Non-Competition Agreement, dated May 14, 2012, between the Company and Paul M. English, as amended by First Amendment, dated May 17, 2012 (filed as exhibit 10.70 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.9*	Employment and Non-Competition Agreement, dated May 14, 2012, between the Company and Melissa H. Reiter, as amended by First Amendment, dated May 17, 2012 (filed as exhibit 10.71 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.10*	Employment and Non-Competition Agreement, dated May 14, 2012, between the Company and Robert M. Birge, as amended by First Amendment, dated May 17, 2012 (filed as exhibit 10.72 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.11*	Employment and Non-Competition Agreement, dated May 14, 2012, between the Company and Karen Ruzic Klein, as amended by First Amendment, dated May 17, 2012 (filed as exhibit 10.73 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.12*	Amadeus Products and Services Agreement, effective as of January 1, 2012, between the Company and Amadeus IT Group S.A. (filed as exhibit 10.66 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)^
10.13*	Lease, dated June 4, 2012, between the Company and Yale & Towne SPE LLC (filed as exhibit 10.74 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)
31.1*	Certification of Chief Executive Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Chief Financial Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1*	Certifications of Chief Executive Officer and Chief Financial Officer, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS**	XBRL Instance Document.
101.SCH**	XBRL Taxonomy Extension Schema Document.
101.CAL**	XBRL Taxonomy Extension Calculation Linkbase Document.

101.DEF**	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB**	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE**	XBRL Taxonomy Extension Presentation Linkbase Document.

* These exhibits were previously included or incorporated by reference in KAYAK Software Corporation's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2012, filed with the Securities and Exchange Commission on August 24, 2012.

** Filed herewith.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

		KAYAK SOFTWARE CORPORATION
Date: September 19, 2012	By:	/s/ Daniel Stephen Hafner
	Name:	Daniel Stephen Hafner
	Title:	Chief Executive Officer and Director

EXHIBIT INDEX

Exhibit No.	Description
3.1*	Amended and Restated Certificate of Incorporation of the Company as in effect (filed as exhibit 3.9 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)
3.2*	Amended and Restated By-Laws of the Company as in effect (filed as exhibit 3.11 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)
4.1*	Form of Registrant’s Class A Common Stock Certificate (filed as exhibit 4.1 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)
4.2*	Form of Registrant’s Class B Common Stock Certificate (filed as exhibit 4.8 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)
4.3*	Election and Amendment Agreement, dated April 19, 2012, between the Company and the stockholders named therein (filed as exhibit 4.9 to Amendment No. 10 to the Registration Statement on Form S-1 filed on April 20, 2012). (1)
10.1*	2012 Equity Incentive Plan (filed as exhibit 10.3 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.2*	KAYAK Insertion Order: IO10963, dated April 5, 2012, between the Company and Expedia (filed as exhibit 10.14 to Amendment No. 13 to the Registration Statement on Form S-1 filed on July 13, 2012). (1)^
10.3*	Form of Indemnification Agreement between the Company and certain of its directors and executive officers (filed as exhibit 10.59 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.4*	Form of Non-Qualified Stock Option Agreement under the 2012 Equity Incentive Plan (filed as exhibit 10.62 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.5*	Election and Amendment Agreement, dated April 19, 2012, between the Company and the stockholders named therein (included in Exhibit 4.3) (filed as exhibit 4.9 to Amendment No. 10 to the Registration Statement on Form S-1 filed on April 20, 2012). (1)
10.6*	Eighth Amendment, dated May 3, 2012, to the Third Amended and Restated 2005 Equity Incentive Plan (filed as exhibit 10.68 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.7*	Employment and Non-Competition Agreement, dated May 14, 2012, between the Company and Daniel Stephen Hafner, as amended by First Amendment, dated May 17, 2012 (filed as exhibit 10.69 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.8*	Employment and Non-Competition Agreement, dated May 14, 2012, between the Company and Paul M. English, as amended by First Amendment, dated May 17, 2012 (filed as exhibit 10.70 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.9*	Employment and Non-Competition Agreement, dated May 14, 2012, between the Company and Melissa H. Reiter, as amended by First Amendment, dated May 17, 2012 (filed as exhibit 10.71 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.10*	Employment and Non-Competition Agreement, dated May 14, 2012, between the Company and Robert M. Birge, as amended by First Amendment, dated May 17, 2012 (filed as exhibit 10.72 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.11*	Employment and Non-Competition Agreement, dated May 14, 2012, between the Company and Karen Ruzic Klein, as amended by First Amendment, dated May 17, 2012 (filed as exhibit 10.73 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)†
10.12*	Amadeus Products and Services Agreement, effective as of January 1, 2012, between the Company and Amadeus IT Group S.A. (filed as exhibit 10.66 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)^
10.13*	Lease, dated June 4, 2012, between the Company and Yale & Towne SPE LLC (filed as exhibit 10.74 to Amendment No. 12 to the Registration Statement on Form S-1 filed on July 9, 2012). (1)
31.1*	Certification of Chief Executive Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Chief Financial Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1*	Certifications of Chief Executive Officer and Chief Financial Officer, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS**	XBRL Instance Document.
101.SCH**	XBRL Taxonomy Extension Schema Document.
101.CAL**	XBRL Taxonomy Extension Calculation Linkbase Document.

101.DEF**	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB**	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE**	XBRL Taxonomy Extension Presentation Linkbase Document.

* These exhibits were previously included or incorporated by reference in KAYAK Software Corporation's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2012, filed with the Securities and Exchange Commission on August 24, 2012.

** Filed herewith.

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Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Customer A Customer Concentration Risk	Jun. 30, 2011 Customer A Customer Concentration Risk	Jun. 30, 2012 Customer A Customer Concentration Risk	Jun. 30, 2011 Customer A Customer Concentration Risk	Jun. 30, 2012 Customer B Customer Concentration Risk	Jun. 30, 2011 Customer B Customer Concentration Risk	Jun. 30, 2012 Customer B Customer Concentration Risk	Jun. 30, 2011 Customer B Customer Concentration Risk	Jun. 30, 2012 Customer C Customer Concentration Risk	Jun. 30, 2011 Customer C Customer Concentration Risk	Jun. 30, 2012 Customer C Customer Concentration Risk	Jun. 30, 2011 Customer C Customer Concentration Risk
Concentration Risk [Line Items]
Percentage of total revenues			26.00%	24.00%	24.00%	25.00%	9.00%	8.00%	10.00%	8.00%	8.00%	12.00%	9.00%	13.00%
Accounts receivable	$ 50,247	$ 37,332	$ 11,438	$ 7,354	$ 11,438	$ 7,354	$ 3,259	$ 1,511	$ 3,259	$ 1,511	$ 4,070	$ 4,242	$ 4,070	$ 4,242

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Stock Options and Restricted Stock Stock Options, Stock Option Activity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2012		Dec. 31, 2011
Stock Option Activity [Roll Forward]
Balance, December 31, 2011 (shares)	9,086,586
Options granted, number of shares	626,500	[1]
Exercised, number of shares	(71,442)
Canceled/forfeited, number of shares	(399,652)
Balance, June 30, 2012 (shares)	9,241,992		9,086,586
Balance, December 31, 2011 (usd per share)	$ 10.79
Options granted, weighted average exercise price (usd per share)	$ 25.03	[1]
Exercised, weighted-average exercise price (usd per share)	$ 18.92
Canceled/forfeited, weighted-average exercise price (usd per share)	$ 19.09
Balance, June 30, 2012 (usd per share)	$ 11.33		$ 10.79
Aggregate Intrinsic Value	$ 140,159	[2]	$ 86,590	[2]
Weighted Average Remaining Contractual Terms (in years)	6 years 10 months 24 days		7 years 3 months 18 days
Vested and exercisable as of June 30, 2012, number of shares	5,780,981
Vested and exercisable as of June 30, 2012, weighted average exercise price (usd per share)	$ 8.09
Vested and exercisable as of June 30, 2012, aggregate intrinsic value	106,431	[2]
Vested and exercisable as of June 30, 2012, weighted average remaining contractual term	5 years 10 months 24 days
Vested and exercisable as of June 30, 2012 and expected to vest thereafter, number of shares	8,653,670	[3]
Vested and exercisable as of June 30, 2012 and expected to vest thereafter, weigthed average exercise price (usd per share)	$ 10.85	[3]
Vested and exercisable as of June 30, 2012 and expected to vest thereafter, aggregate intrinsic value	$ 135,450	[2],[3]
Vested and exercisable as of June 30, 2012 and expected to vest thereafter, weighted average remaining contractual term	6 years 9 months 18 days	[3]

[1] Includes 242,500 shares granted to non-employees. The assumptions used to value these grants are similar to those used for grants made to employees with the exception of the expected term.

[2] The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying award and the fair value of $26.50, and $20.14 of our common stock on June 30, 2012, and December 31, 2011.

[3] Stock options expected to vest reflect an estimated forfeiture rate.

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Accrued Expenses and Other Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accrued bonus	$ 3,475	$ 5,792
Income taxes payable	5,939	2,515
Accrued marketing	7,812	1,141
Other accrued expenses	7,534	6,772
Accrued expenses and other current liabilities	$ 24,760	$ 16,220

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Stock Options and Restricted Stock Stock Options, Valuation Assumptions (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk-free interest rate	1.00%	1.80%
Expected volatility	44.60%	43.80%
Expected life (in years)	6 years	6 years
Dividend yield	0.00%	0.00%

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Intangible Assets - Intangible Assets by Major Class (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			1 Months Ended	6 Months Ended	12 Months Ended								12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jan. 31, 2011 Domain and trade names [Member]	Jun. 30, 2011 Domain and trade names [Member]	Dec. 31, 2011 Domain and trade names [Member]	Jun. 30, 2012 Domain and trade names [Member]	Jun. 30, 2012 Customer relationships [Member]	Dec. 31, 2011 Customer relationships [Member]	Jun. 30, 2012 Technology [Member]	Dec. 31, 2011 Technology [Member]	Jun. 30, 2012 Non-compete agreements [Member]	Dec. 31, 2011 Non-compete agreements [Member]	Dec. 31, 2011 Level 3 [Member] Discounted cash flows [Member] Domain and trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 49,091		$ 49,091						$ 33,345	$ 10,651	$ 10,878	$ 4,141	$ 4,160	$ 954	$ 982
Gross Carrying Amount					49,525			33,505
Accumulated Amortization	(34,528)		(34,528)		(16,861)			(11,255)	(26,628)	(4,569)	(3,826)	(2,672)	(1,287)	(659)	(493)
Impairment	0	0	0	(14,980)		(14,980)	(14,980)	(14,980)
Intangible assets, net	14,563		14,563		17,684			7,270	6,717	6,082	7,052	1,469	2,873	295	489
Amortization expense	$ 1,400	$ 1,900	$ 2,815	$ 3,535
Discount rate																17.00%

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Accrued Expenses and Other Current Liabilities (Tables)

6 Months Ended

Jun. 30, 2012

Accounts Payable and Accrued Liabilities, Current [Abstract]

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following:

	June 30, 2012		December 31, 2011
Accrued bonus	$	3,475	$	5,792
Income taxes payable	5,939		2,515
Accrued marketing	7,812		1,141
Other accrued expenses	7,534		6,772
Accrued expenses and other current liabilities	$	24,760	$	16,220

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Earnings per share - Computation of Basic (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basic earnings (loss) per share:
Net income (loss)	$ 7,288	$ 3,776	$ 11,433	$ (3,138)
Redeemable convertible preferred stock dividends declared	(2,936)	(2,936)	(5,872)	(5,872)
Deemed dividend resulting from modification of redeemable convertible preferred stock	(2,929)	0	(2,929)	0
Net income (loss) attributed to common stockholders	$ 1,423	$ 840	$ 2,632	$ (9,010)
Weighted average common shares outstanding (shares)	7,049,863	7,505,505	7,043,571	7,451,737
Basic earnings (loss) per share (usd per share)	$ 0.20	$ 0.11	$ 0.37	$ (1.21)

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Subsequent Events (unaudited)

6 Months Ended

Jun. 30, 2012

Subsequent Events [Abstract]

Subsequent Events (unaudited)

Subsequent Events (unaudited)

On July 25, 2012, we completed our IPO whereby we sold 4,025,000 shares of our Class A common stock at a price of $26.00 per share before underwriting discounts and commissions. The IPO generated net proceeds of approximately $97.3 million, after deducting underwriting discounts and commissions but before estimated offering expenses of $3.8 million. Upon the closing of the IPO, all shares of our then-outstanding common stock and preferred stock automatically converted into an aggregate of 33,864,565  shares of Class B common stock. Additionally, all outstanding options and warrants as of that date automatically converted into options and warrant to purchase Class B common stock.

Effective as of July 19, 2012, upon the pricing of our IPO, options to purchase 1,300,000 shares of our common stock were awarded to certain employees and officers of the Company. The exercise price of these stock options is $26.00 per share. These options will vest over four years with 25% of the shares subject to these stock options vesting on January 19, 2013 and then monthly thereafter. Total unrecognized estimated compensation expense relate to these non-vested options is approximately $14,800, calculated using a Black-Scholes Model as described in "-Note 13 - Stock Options and Restricted Stock."

Upon the consummation of our IPO, we issued to certain stockholders, for no cash consideration, 308,032 shares of Class A common stock. In addition, certain of our stockholders also vested in a right to purchase from us, up to an aggregate of 352,178 shares of Class A common stock at an exercise price of $26.00 per share. This right terminated on August 1, 2012, and eligible stockholders elected to purchase 231,695 of these shares for an additional consideration of approximately $6.0 million. Issuances described in this paragraph were in consideration for such stockholders entry into that certain Election and Amendment Agreement, dated April 19, 2012, pursuant to which certain stockholders provided various elections, waivers, consents and amendments related to our capital structure as described in "- Note 11 - Redeemable Convertible Preferred Stock".

Effective as of July 20, 2012, we entered into a settlement agreement with Orbitz Worldwide, LLC pursuant to which the parties agreed to resolve their ongoing disputes. The settlement agreement did not involve any material financial payments between the companies, nor did it involve any material changes in contractual terms.

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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Dec. 31, 2011
Operating leases
Operating leases, rent expense	$ 332	$ 426	$ 671	$ 897
Other Commitments
Other Commitments Content Licensing Agreement Due In Remaining Fiscal Year	3,500		3,500
Other commitments, product and services agreement, minimum future payments per year	1,600		1,600
Other commitments, product and services agreement, minimum future payments due within six months	$ 800		$ 800

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Acquisitions Purchase price allocation (Details) (USD $) In Thousands, unless otherwise specified				0 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Apr. 02, 2011 JaBo Software [Member]	Apr. 02, 2011 Customer Relationships (useful life - 7 years) [Member] JaBo Software [Member]		Apr. 02, 2011 Trade & Domain Names (usefule life - 10 years) [Member] JaBo Software [Member]		Apr. 02, 2011 Current Technology (useful life - 2 years) [Member] JaBo Software [Member]		Apr. 02, 2011 Noncompete Agreements (useful life - 2 years) [Member] JaBo Software [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 155,244	$ 155,677	$ 4,138
Useful life of intangible assets				7 years		10 years		2 years		2 years
Accounts receivable and other assets			983
Contingent asset			230
Identifiable intangible assets
Identifiable intangible assets				3,200	[1]	2,600	[1]	700	[1]	300	[1]
Total assets			12,151
Liabilities assumed:
Deferred tax liability			1,700
Other liabilities			1,291
Total net assets acquired			$ 9,160

[1] The weighted average useful life of the identifiable intangible assets acquired is 7 years.

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Liabilities, Fair Value Disclosure [Abstract]

Warrant Liability, Changes in Valuation

Changes in valuation during the years ended December 31, 2011 and the six months endedJune 30, 2012, were as follows:

	Level 3 Warrant Instruments
Balance, December 31, 2011	1,150
Mark-to-market adjustment	169
Balance, June 30, 2012	$	1,319

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Redeemable Convertible Preferred Stock Preferred Stock Warrants (Details) (USD $) In Thousands, except Share data, unless otherwise specified		3 Months Ended		6 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2012	Jun. 30, 2012 Series D Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2011 Series D Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2012 Series D Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2011 Series D Redeemable Convertible Preferred Stock [Member]	Dec. 31, 2011 Series D Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2012 Series C Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2011 Series C Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2012 Series C Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2011 Series C Redeemable Convertible Preferred Stock [Member]	Dec. 31, 2011 Series C Redeemable Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Number of shares entited by rights issued	352,178	62,000		62,000			41,904		41,904
Exercise price of rights (usd per share)	26	20.73		20.73			2.983		2.983
Warrant liability		$ 489		$ 489		$ 426	$ 830		$ 830		$ 724
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) Included in Other Income		$ (84)	$ (183)	$ (63)	$ (66)		$ (106)	$ (55)	$ (106)	$ (143)
Risk free interest rate				0.40%		0.40%			0.30%		0.30%
Expected volatility				41.20%		42.90%			42.00%		41.00%
Expected life (in years)				3 years		3 years			2 years		2 years
Dividend yield				0.00%		0.00%			0.00%		0.00%

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Related Party Transactions (Details) (Travel Post [Member], USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended
	May 31, 2011	Mar. 31, 2010
Related Party Transaction [Line Items]
Monthy Licence Fee From Related Party	$ 10	$ 50
Series A Preferred Stock [Member]
Related Party Transaction [Line Items]
Amendment to commercial agreement, sale of subsidiary, shares received	1,000,000

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Goodwill (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Goodwill [Roll Forward]
Balance, December 31, 2011	$ 155,677
Foreign currency translation	(433)
Balance, June 30, 2012	$ 155,244

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2012

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Significant Estimates and Judgments

The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America 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 financial statements and the reported amounts of revenue and expenses during the reporting period. Significant estimates relied upon in preparing these financial statements include the provision for uncollectible accounts, estimates used to determine the fair value of our common stock, preferred stock, put option, stock-based compensation and preferred stock warrants, recoverability of our net deferred tax assets and the fair value of long lived assets and goodwill. Changes in estimates are recorded in the period in which they become known. We base estimates on historical experience and various other assumptions that we believe to be reasonable under the circumstances. Actual results may differ from our estimates.

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, and have been prepared in accordance with accounting principles generally accepted in the United States of America. Operating results of acquired businesses are included in the consolidated statements of operations from the date of acquisition. All intercompany accounts and transactions have been eliminated. We have reclassified certain prior period amounts  to conform to our current period presentation.

The interim financial statements and footnotes are unaudited. In the opinion of our management, these statements include all adjustments, which are of a normal recurring nature, necessary to present a fair statement of the Company’s results of operations, financial position and cash flows. Interim results are not necessarily indicative of financial results for a full year. The interim information included in this Form 10-Q should be read in conjunction with our prospectus filed with the Securities and Exchange Commission, or SEC, pursuant to Rule 424 (b) on July 20, 2012 relating to our initial public offering, or IPO.

Foreign Currency Translation

Assets and liabilities for our international operations are translated to U.S. dollars at current exchange rates in effect at the balance sheet date. Income and expense accounts are translated at average exchange rates in effect during the year. Resulting translation adjustments are recorded as a separate component of accumulated other comprehensive income.

Segments

We have one operating segment for financial reporting purposes: travel search.

Revenue Recognition

KAYAK’s services are free for travelers. We earn revenues by sending referrals to travel suppliers and Online Travel Agents, OTAs after a traveler selects a specific itinerary (distribution revenues), and through advertising placements on our websites and mobile applications (advertising revenues).

We recognize distribution revenue upon completion of the referral, provided that our fees are fixed and determinable, there is persuasive evidence of an arrangement and collection is reasonably assured. Advertising revenues are recognized when a traveler clicks on an advertisement that a customer has placed on our website or when we display an advertisement.

Distribution Revenues

We earn distribution revenues by sending qualified leads to travel suppliers and OTAs and by facilitating bookings directly through our websites and mobile applications. After a traveler has entered a query on our website, reviewed the results, and decided upon a specific itinerary, we send the user directly into the travel supplier's or OTA's purchase process to complete the transaction. In many cases, users may now complete bookings with the travel supplier or OTA without leaving our websites and mobile applications. Travel suppliers and OTAs have the flexibility to pay us either when these qualified leads click on a query result at a set cost per click, or CPC basis, or when they purchase a travel product on the travel supplier or OTA website which we refer to as a cost per acquisition, or CPA, basis. We separately negotiate and enter into our distribution agreements, and these agreements set forth the payment terms for the applicable travel supplier or OTA

Advertising Revenues

Advertising revenues primarily come from payments for compare units, text-based sponsored links and display advertisements. A “compare unit” is an advertising placement that, if selected by a KAYAK user, launches the advertiser’s website and initiates a query based on the same travel parameters provided on the KAYAK website. The major types of advertisers on our websites consist of OTAs, third party sponsored link providers, hotels, airlines and vacation package providers. Generally, our advertisers pay us on a CPC basis, which means advertisers pay us only when someone clicks on one of their advertisements, or on a cost per thousand impression basis, or CPM. Paying on a CPM basis means that advertisers pay us based on the number of times their advertisements appear on our websites.

Concentrations of Credit Risk

Financial instruments that subject the Company to significant concentrations of credit risk consist primarily of cash, cash equivalents, marketable securities and accounts receivable. The Company’s cash and cash equivalents and marketable securities are primarily held in one financial institution that we believe to be of high credit quality.

Significant customers accounted for the following percentages of total revenues:

	Three Months Ended June 30,		Six Months Ended June 30,
	2012	2011	2012	2011
Customer A	26%	24%	24%	25%
Customer B	9%	8%	10%	8%
Customer C	8%	12%	9%	13%

Amounts due from these significant customers were:

	June 30,		December 31,
	2012		2011
Customer A	$	11,438	$	7,354
Customer B	3,259		1,511
Customer C	4,070		4,242

We believe significant customer amounts outstanding at June 30, 2012 and December 31, 2011 are collectible.

Cost of Revenues

Cost of revenues consists primarily of expenses incurred related to airfare query costs, data center costs and related bandwidth charges. All costs of revenues are expensed as incurred.

Marketing

Marketing expenses are comprised primarily of costs of search engine and other digital marketing, brand advertising, affiliate referral fees, and public relations. All marketing costs are expensed as incurred.

Stock-Based Compensation

We estimate the value of stock option awards on the date of grant using the Black-Scholes option-pricing model (the Black-Scholes model). The determination of the fair value of stock option awards on the date of grant is affected by our estimated stock price as well as assumptions regarding a number of complex and subjective variables. These variables include our expected stock price volatility over the term of the awards, expected term, risk-free interest rate, expected dividends and expected forfeiture rates. The forfeiture rate is estimated using historical option cancellation information, adjusted for anticipated changes in exercise and employment termination behavior. Outstanding awards do not contain market or performance conditions and therefore, we recognize stock-based compensation expense on a straight-line basis over the requisite service period.

We account for stock options issued to non-employees in accordance with the guidance for equity-based payments to non-employees. Stock option awards to non-employees are accounted for at fair value using the Black-Scholes option-pricing model. Our management believes that the fair value of stock options is more reliably measured than the fair value of the services received. The fair value of the unvested portion of the options granted to non-employees is re-measured each period. The resulting increase or decrease in value, if any, is recognized during the period the related services are rendered. The fair value of each non-employee stock-based compensation award is re-measured each period until a commitment date is reached, which is generally the vesting date.

Fair Value of Financial Instruments

The carrying amounts of the Company’s cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities, approximate fair value because of their short maturities.

Cash Equivalents and Marketable Securities

Cash equivalents include all highly liquid investments maturing within 90 days from the date of purchase.

Marketable securities are classified as held-to-maturity as we have the intent and ability to hold these investments to maturity. Marketable securities are reported at amortized cost. Cash equivalents and marketable securities are invested in instruments we believe to be of high-quality, primarily money market funds, U.S. Government obligations, State and Municipality obligations and corporate bonds with remaining contractual maturities of less than one year.

Accounts Receivable and Allowance for Doubtful Accounts

We review accounts receivable on a regular basis and estimate an amount of losses for uncollectible accounts based on our historical collections experience, age of the receivable and knowledge of the customer. We record changes in our estimate to the allowance for doubtful accounts through bad debt expense and relieve the allowance when accounts are ultimately collected or determined to be uncollectible.

Deferred Financing Costs Related to Initial Public Offering

As of June 30, 2012 and December 31, 2011 we had incurred $3,314 and $2,173, respectively, of legal and accounting costs related to our IPO. We capitalize such costs in prepaid expense and other current assets and will net these costs against the proceeds received from the IPO which occurred on July 25, 2012.

Property and Equipment

Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation of property and equipment is computed on a straight-line basis over the estimated useful lives of the assets or, when applicable, the life of the lease, whichever is shorter.

Software and Website Development Costs

Certain costs to develop internal use computer software are capitalized provided these costs are expected to be recoverable. These costs are included in property and equipment and are amortized over three years beginning when the asset is substantially ready for use. Costs incurred during the preliminary project stage, as well as maintenance and training costs are expensed as incurred. We capitalized $248 and $278 of software development costs and amortized $267 and $213 in the three months endedJune 30, 2012 and June 30, 2011, respectively, and capitalized $470 and $475 and amortized $527 and $413 in the six months endedJune 30, 2012 and June 30, 2011, respectively.

Impairment of Long-Lived Assets

Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. When such events occur, we compare the carrying amounts of the assets to their undiscounted expected future cash flows. If this comparison indicates that there is impairment, the amount of the impairment is calculated as the difference between the carrying value and fair value. During the six months endedJune 30, 2011 we recorded an impairment charge of $15.0 million on trade and domain name assets related to our decision to discontinue the sidestep.com URL. See “—Note 6—Intangible Assets” for additional description of our impairment charge.

Goodwill

Goodwill represents the excess of the cost of acquired business over the fair value of the assets acquired at the date of acquisition. Goodwill is tested for impairment at least annually and whenever events or changes in circumstances indicate that goodwill may be impaired. Goodwill is not deductible for tax purposes.

We assess goodwill for possible impairment using a two-step process. The first step identifies if there is potential goodwill impairment. If step one indicates that an impairment may exist, a second step is performed to measure the amount of the goodwill impairment, if any. Goodwill impairment exists when the estimated fair value of goodwill is less than its carrying value. If impairment exists, the carrying value of the goodwill is reduced to fair value through an impairment charge in our consolidated statements of operations.

For purposes of goodwill impairment testing, we estimate the fair value of the Company using generally accepted valuation methodologies, including market and income based approaches, and relevant data available through and as of the testing date. The market approach is a valuation method in which fair value is estimated based on observed prices in actual transactions and on asking prices for similar assets. Under the market approach, the valuation process is essentially that of comparison and correlation between the subject asset and other similar assets. The income approach is a method in which fair value is estimated based on the cash flows that an asset could be expected to generate over its useful life, including residual value cash flows. These cash flows are then discounted to their present value using a rate of return that accounts for the relative risk of not realizing the estimated annual cash flows and for the time value of money.

Warrant liability

Warrants to purchase redeemable convertible preferred stock are accounted for on the balance sheets at fair value as liabilities. Changes in fair value are recognized in earnings in the period of change.

Accumulated Other Comprehensive Income

Accumulated other comprehensive income consists of foreign currency translation adjustments. The financial statements of non-U.S. entities are translated from their functional currencies into U.S. dollars. Assets and liabilities are translated at period end rates of exchange and revenue and expenses are translated using average rates of exchange. The resulting gain or loss is included in accumulated other comprehensive income on the balance sheet.

Income Taxes

We record income taxes under the liability method. Interest and penalties related to income tax liabilities, if any, are included in income tax expense. Deferred tax assets and liabilities reflect our estimation of the future tax consequences of temporary differences between the carrying amounts of assets and liabilities for book and tax purposes. We determine deferred income taxes based on the differences in accounting methods and timing between financial statement and income tax reporting. Accordingly, we determine the deferred tax asset or liability for each temporary difference based on the enacted tax rates expected to be in effect when we realize the underlying items of income and expense. We consider many factors when assessing the likelihood of future realization of our deferred tax assets, including our recent earnings experience by jurisdiction, expectations of future taxable income, and the carryforward periods available to us for tax reporting purposes, as well as other relevant factors. We may establish a valuation allowance to reduce deferred tax assets to the amount we believe is more likely than not to be realized. Due to inherent complexities arising from the nature of our businesses, future changes in income tax law, tax sharing agreements or variances between our actual and anticipated operating results, we make certain judgments and estimates. Therefore, actual income taxes could materially vary from these estimates.

Effective January 1, 2007, we adopted the authoritative guidance for uncertainty in income taxes. This guidance requires that we recognize a tax benefit from an uncertain position only if it is more likely than not that the position is sustainable, based solely on its technical merits and consideration of the relevant taxing authority’s widely understood administrative practices and precedents. If this threshold is met, we would measure the tax benefit as the largest amount of benefit that is greater than fifty percent likely of being realized upon ultimate settlement. The adoption of this guidance did not have a material impact on our financial statements. Penalties and interest on uncertain tax positions are included in income tax expense.

Recent Accounting Pronouncements

In June 2011, the FASB issued amended disclosure requirements for the presentation of comprehensive income. The amended guidance eliminates the option to present components of other comprehensive income (OCI) as part of the statement of changes in equity. Under the amended guidance, all changes in OCI are to be presented either in a single continuous statement of comprehensive income or in two separate but consecutive financial statements. We adopted these changes effective January 1, 2012 and applied retrospectively for all periods presented. There was no impact to the consolidated results as the amendments related only to changes in financial statement presentation.

In September 2011, the FASB issued amended guidance that will simplify how entities test goodwill for impairment. After an assessment of certain qualitative factors, if it is determined to be more likely than not that the fair value of a reporting unit is less than its carrying amount, entities must perform the quantitative analysis of the goodwill impairment test. Otherwise, the quantitative test becomes optional. The guidance is effective January 1, 2012, with early adoption permitted. We elected to adopt this guidance for the 2011 goodwill impairment test performed in the fourth quarter. Goodwill impairment testing did not result in any impact to our financial results.

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Information about Geographic Areas (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues [Line Items]
Revenues	$ 76,938	$ 56,753	$ 150,276	$ 109,427
United States
Revenues [Line Items]
Revenues	61,957	46,890	121,125	92,116
Germany
Revenues [Line Items]
Revenues	6,635	5,761	14,237	11,173
Rest of the world [Member]
Revenues [Line Items]
Revenues	$ 8,346	$ 4,102	$ 14,914	$ 6,138

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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 10,912		$ 11,198
Level 1 Fair Value [Member]
Schedule of Held-to-maturity Securities [Line Items]
Level 1 Fair Value	10,910	[1]	11,191	[1]
Agency bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,001		2,605
Agency bonds [Member] | Level 1 Fair Value [Member]
Schedule of Held-to-maturity Securities [Line Items]
Level 1 Fair Value	1,001	[1]	2,605	[1]
Certificates of deposit [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	900		900
Certificates of deposit [Member] | Level 1 Fair Value [Member]
Schedule of Held-to-maturity Securities [Line Items]
Level 1 Fair Value	900	[1]	899	[1]
Commercial paper [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	3,594		3,097
Commercial paper [Member] | Level 1 Fair Value [Member]
Schedule of Held-to-maturity Securities [Line Items]
Level 1 Fair Value	3,595	[1]	3,096	[1]
Corporate Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	5,417		4,596
Corporate Debt Securities [Member] | Level 1 Fair Value [Member]
Schedule of Held-to-maturity Securities [Line Items]
Level 1 Fair Value	$ 5,414	[1]	$ 4,591	[1]

[1] Level 1 fair values are defined as observable inputs such as quoted prices in active markets.

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Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2012

Marketable Securities [Abstract]

Marketable Securities

The following tables summarize the investments in marketable securities all of which are classified as held to maturity:

	June 30, 2012				December 31, 2011
	Amortized Cost		Level  1(1) Fair Value		Amortized Cost		Level  1(1) Fair Value
Agency bonds	$	1,001	$	1,001	$	2,605	$	2,605
Certificate of deposit	900		900		900		899
Commercial paper	3,594		3,595		3,097		3,096
Corporate debentures/ bonds	5,417		5,414		4,596		4,591
Marketable securities	$	10,912	$	10,910	$	11,198	$	11,191

(1) Level 1 fair values are defined as observable inputs such as quoted prices in active markets.

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Acquisitions (Tables)

6 Months Ended

Jun. 30, 2012

Business Combinations [Abstract]

Schedule of Purchase Price Allocation

The table below sets forth the final purchase price allocation:

Assets acquired:
Accounts receivable and other assets	$	983
Contingent asset	230
Identifiable intangible assets (1)
Customer relationships (useful life—7 years)	3,200
Trade & domain names (useful life—10 years)	2,600
Current technology (useful life—2 years)	700
Non-compete agreements (useful life—2 years)	300
Goodwill	4,138
Total assets	12,151
Liabilities assumed:
Deferred tax liability	1,700
Other liabilities	1,291
Total net assets acquired	$	9,160

(1) The weighted average useful life of the identifiable intangible assets acquired is 7 years.

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Stock Options and Restricted Stock Stoct Options Outsanding and Exercisable By Exercise Price Range (Details) (USD $)	6 Months Ended
	Jun. 30, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	9,241,992
Options Outstanding Weighted Average Remaining Contractual Life (in Years)	6 years 10 months 24 days
Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 11.33
Options Exercisable and Vested, Number of Shares	5,780,981
Options Exercisable and Vested, Weighted-Average Exercise Price (usd per share)	$ 8.09
$1.00 - $1.40 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	971,103
Options Outstanding Weighted Average Remaining Contractual Life (in Years)	2 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 1.16
Options Exercisable and Vested, Number of Shares	971,103
Options Exercisable and Vested, Weighted-Average Exercise Price (usd per share)	$ 1.16
Exercise Price, Lower Limit (usd per share)	$ 1.00
Exercise Price, Upper Limit (usd per share)	$ 1.40
$2.98 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	216,240
Options Outstanding Weighted Average Remaining Contractual Life (in Years)	4 years 3 months 18 days
Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 2.98
Options Exercisable and Vested, Number of Shares	216,240
Options Exercisable and Vested, Weighted-Average Exercise Price (usd per share)	$ 2.98
Exercise Price (usd per share)	$ 2.98
$ 5.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	1,362,500
Options Outstanding Weighted Average Remaining Contractual Life (in Years)	4 years 10 months 24 days
Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 5.00
Options Exercisable and Vested, Number of Shares	1,362,500
Options Exercisable and Vested, Weighted-Average Exercise Price (usd per share)	$ 5.00
Exercise Price (usd per share)	$ 5.00
$7.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	1,737,000
Options Outstanding Weighted Average Remaining Contractual Life (in Years)	7 years
Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 7.50
Options Exercisable and Vested, Number of Shares	1,284,822
Options Exercisable and Vested, Weighted-Average Exercise Price (usd per share)	$ 7.50
Exercise Price (usd per share)	$ 7.50
$11.29 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	255,000
Options Outstanding Weighted Average Remaining Contractual Life (in Years)	7 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 11.29
Options Exercisable and Vested, Number of Shares	166,041
Options Exercisable and Vested, Weighted-Average Exercise Price (usd per share)	$ 11.29
Exercise Price (usd per share)	$ 11.29
$13.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	955,000
Options Outstanding Weighted Average Remaining Contractual Life (in Years)	7 years 6 months
Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 13.00
Options Exercisable and Vested, Number of Shares	562,597
Options Exercisable and Vested, Weighted-Average Exercise Price (usd per share)	$ 13.00
Exercise Price (usd per share)	$ 13.00
$14.82 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	1,905,316
Options Outstanding Weighted Average Remaining Contractual Life (in Years)	8 years 3 months 18 days
Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 14.82
Options Exercisable and Vested, Number of Shares	840,814
Options Exercisable and Vested, Weighted-Average Exercise Price (usd per share)	$ 14.82
Exercise Price (usd per share)	$ 14.82
$15.50 - $21.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	1,153,333
Options Outstanding Weighted Average Remaining Contractual Life (in Years)	8 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 19.03
Options Exercisable and Vested, Number of Shares	355,614
Options Exercisable and Vested, Weighted-Average Exercise Price (usd per share)	$ 17.87
Exercise Price, Lower Limit (usd per share)	$ 15.50
Exercise Price, Upper Limit (usd per share)	$ 21.00
$25.50 - $26.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Shares	686,500
Options Outstanding Weighted Average Remaining Contractual Life (in Years)	9 years 8 months 12 days
Options Outstanding, Weighted Average Exercise Price (usd per share)	$ 25.74
Options Exercisable and Vested, Number of Shares	21,250
Options Exercisable and Vested, Weighted-Average Exercise Price (usd per share)	$ 25.50
Exercise Price, Lower Limit (usd per share)	$ 25.50
Exercise Price, Upper Limit (usd per share)	$ 26.50

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Property and Equipment Property and Equipment (Table) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Property and Equipment [Line Items]
Property and equipment	$ 14,192	$ 13,115
Accumulated depreciation	(8,924)	(7,641)
Property and equipment, net	5,268	5,474
Website development [Member]
Property and Equipment [Line Items]
Property and equipment, estimated life	3 years
Property and equipment	6,022	5,552
Computer equipment [Member]
Property and Equipment [Line Items]
Property and equipment, estimated life	3 years
Property and equipment	4,669	4,172
Leasehold improvements [Member]
Property and Equipment [Line Items]
Property and equipment	2,310	2,283
Furniture and fixtures [Member]
Property and Equipment [Line Items]
Property and equipment, estimated life	5 years
Property and equipment	793	749
Software [Member]
Property and Equipment [Line Items]
Property and equipment, estimated life	3 years
Property and equipment	305	266
Vehicles [Member]
Property and Equipment [Line Items]
Property and equipment, estimated life	5 years
Property and equipment	53	53
Office equipment [Member]
Property and Equipment [Line Items]
Property and equipment, estimated life	5 years
Property and equipment	$ 40	$ 40

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Property and Equipment (Tables)

6 Months Ended

Jun. 30, 2012

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment consisted of the following:

	Estimated Life	June 30,			December 31,
		2012			2011
Website development	3 years	$	6,022		$	5,552
Computer equipment	3 years	4,669			4,172
Leasehold improvements	Life of lease	2,310			2,283
Furniture and fixtures	5 years	793			749
Software	3 years	305			266
Vehicles	5 years	53			53
Office equipment	5 years	40			40
Property and equipment		14,192			13,115
Accumulated depreciation		(8,924		)	(7,641		)
Property and equipment, net		$	5,268		$	5,474

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Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2012

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule Intangible Assets by Major Asset Class

The following tables detail our intangible asset balances by major asset class:

	June 30, 2012							December 31, 2011
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Impairment			Net Carrying Amount
Intangible asset class
Domain and trade names	$	33,345	$	(26,628	)	$	6,717	$	33,505	$	(11,255	)	$	(14,980	)	$	7,270
Customer relationships	10,651		(4,569		)	6,082		10,878		(3,826		)	—			7,052
Technology	4,141		(2,672		)	1,469		4,160		(1,287		)	—			2,873
Non-compete agreements	954		(659		)	295		982		(493		)	—			489
Intangible assets, net	$	49,091	$	(34,528	)	$	14,563	$	49,525	$	(16,861	)	$	(14,980	)	$	17,684

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Organization

6 Months Ended

Jun. 30, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

Organization

The Company was incorporated in Delaware on January 14, 2004 under the name of Travel Search Company, Inc. On August 17, 2004, we officially changed our name to KAYAK Software Corporation (the Company). We operate KAYAK.com and other travel websites and mobile applications that allow people to search for rates and availability for airline tickets, hotel rooms, rental cars, and other travel-related services across hundreds of websites and provide choices on where to book. As used in this report, the terms “we,” “us,” “our,” and the “Company” mean KAYAK Software Corporation and its subsidiaries, unless the context indicates another meaning.

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Goodwill (Tables)

6 Months Ended

Jun. 30, 2012

Goodwill Disclosure [Abstract]

Goodwill roll-forward

Changes in the carrying amount of goodwill for the year endedDecember 31, 2011 and six months endedJune 30, 2012 were as follows:

Balance, December 31, 2011	$	155,677
Foreign currency translation	(433		)
Balance, June 30, 2012	$	155,244

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Summary of Significant Accounting Policies - Narrative (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			1 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 segments	Jun. 30, 2011	Dec. 31, 2011	Jan. 31, 2011 Domain and trade names [Member]	Jun. 30, 2011 Domain and trade names [Member]	Dec. 31, 2011 Domain and trade names [Member]	Jun. 30, 2012 Internal use computer software [Member]
Segments
Number of operating segments for financial reporting purposes			1
Cash Equivalents and Marketable Securities
Highly liquid investments maximum maturity period included in cash equivalents			90 days
Deferred Finance Costs Related to Initial Public Offering
Deferred legal and accounting costs	$ 3,314		$ 3,314		$ 2,173
Software and Development Costs
Property and equipment amortization period									3 years
Capitalized internal use software development costs	248	278	470	475
Amortization of internal use software development costs	267	213	527	413
Impairment of Long-Lived Assets
Impairment of intangible assets	$ 0	$ 0	$ 0	$ 14,980		$ 14,980	$ 14,980	$ 14,980

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Stock Options and Restricted Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options authorized (shares)	13,000,000	12,000,000
Common stock, fair value (usd per share)	$ 26.50	$ 20.14
Options granted to non-employees (shares)	242,500
Vested shares, total fair value	$ 5,655	$ 10,885
Stock options exercised, total intrinsic value	462	4,143
Weighted-average fair value of options (usd per share)	$ 12.72	$ 9.71
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, life of the option	10 years
Estimated rate of stock options vested	25.00%
Estimated remaining ratable period	36 months
Total unrecognized estimated compensation expense, non-vested options	$ 29,345	$ 31,124
Weighted average remaining vesting period	2 years 4 months 24 days	2 years 7 months 6 days
2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, available (shares)	933,098	159,946

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Consolidated Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 54,550		$ 35,127
Marketable securities	10,912		11,198
Accounts receivable, net of allowance for doubtful accounts of $3,354 and $3,581 at June 30, 2012, and December 31, 2011 respectively	50,247		37,332
Deferred tax asset	2,212		2,212
Prepaid expenses and other current assets	5,826		5,425
Total current assets	123,747		91,294
Property and equipment, net	5,268		5,474
Intangible assets, net	14,563		17,684
Goodwill	155,244		155,677
Deferred tax asset	9,441		7,488
Other assets	248		331
Total assets	308,511		277,948
Current liabilities
Accounts payable	16,212		9,514
Accrued expenses and other current liabilities	24,760		16,220
Total current liabilities	40,972		25,734
Warrant liability	1,319		1,150
Deferred tax liability	3,241		4,202
Other long-term liabilities	799		1,092
Total liabilities	46,331		32,178
Redeemable convertible preferred stock
Commitments and contingencies (Note 10)
Stockholders’ equity (deficit)
Additional paid-in capital	6,575		3,296
Cumulative translation adjustment	(2,215)		(977)
Accumulated earnings (deficit)	1,518		(4,050)
Stockholders’ equity (deficit)	5,885		(1,724)
Total liabilities and stockholders’ equity	308,511		277,948
Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	256,295		247,494
Series A Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	7,154		9,702
Series A1 Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	1,915		2,355
Series B Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	8,023		9,888
Series B1 Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	3,226		4,026
Series C Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	14,113		15,372
Series D Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	221,864		206,151
Common Stock
Stockholders’ equity (deficit)
Common Stock	7		7
Common Class A [Member]
Stockholders’ equity (deficit)
Common Stock	0	[1]	0	[1]
Common Class B [Member]
Stockholders’ equity (deficit)
Common Stock	0		0
Pro Forma [Member]
Current assets
Cash and cash equivalents	54,550	[2]
Marketable securities	10,912	[2]
Accounts receivable, net of allowance for doubtful accounts of $3,354 and $3,581 at June 30, 2012, and December 31, 2011 respectively	50,247	[2]
Deferred tax asset	2,212	[2]
Prepaid expenses and other current assets	5,826	[2]
Total current assets	123,747	[2]
Property and equipment, net	5,268	[2]
Intangible assets, net	14,563	[2]
Goodwill	155,244	[2]
Deferred tax asset	9,441	[2]
Other assets	248	[2]
Total assets	308,511	[2]
Current liabilities
Accounts payable	16,212	[2]
Accrued expenses and other current liabilities	24,760	[2]
Total current liabilities	40,972	[2]
Warrant liability	1,319	[2]
Deferred tax liability	3,241	[2]
Other long-term liabilities	799	[2]
Total liabilities	46,331	[2]
Redeemable convertible preferred stock
Commitments and contingencies (Note 10)		[2]
Stockholders’ equity (deficit)
Additional paid-in capital	262,843	[2]
Cumulative translation adjustment	(2,215)	[2]
Accumulated earnings (deficit)	1,518	[2]
Stockholders’ equity (deficit)	262,180	[2]
Total liabilities and stockholders’ equity	308,511	[2]
Pro Forma [Member] | Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	0	[2]
Pro Forma [Member] | Series A Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	0	[2]
Pro Forma [Member] | Series A1 Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	0	[2]
Pro Forma [Member] | Series B Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	0	[2]
Pro Forma [Member] | Series B1 Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	0	[2]
Pro Forma [Member] | Series C Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	0	[2]
Pro Forma [Member] | Series D Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock
Redeemable convertible preferred stock	0	[2]
Pro Forma [Member] | Common Stock
Stockholders’ equity (deficit)
Common Stock	0	[2]
Pro Forma [Member] | Common Class A [Member]
Stockholders’ equity (deficit)
Common Stock	0	[1],[2]
Pro Forma [Member] | Common Class B [Member]
Stockholders’ equity (deficit)
Common Stock	$ 34	[2]

[1] Upon the completion of an initial public offering, we will have two classes of common stock. All existing shares will convert into Class B common stock and shares sold in the initial public offering will be Class A common stock. The rights of the holders of our common stock are identical except with respect to voting and conversion rights.

[2] The unaudited pro forma balance sheet gives effect to the conversion of all outstanding shares of our common stock and our redeemable convertible preferred stock into 33,864,565 shares of Class B common stock upon the completion of an initial public offering.

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Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 650	$ 441	$ 1,285	$ 867

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Consolidated Statements of Changes in Stockholders' Equity (Deficit) (unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Other Comprehensive Income (Loss)	Accumulated Equity (Deficit)
Balance at Dec. 31, 2011	$ (1,724)	$ 7	$ 3,296	$ (977)	$ (4,050)
Balance, shares at Dec. 31, 2011		7,025,467
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option expense	5,840		5,840
Issuance of common stock, shares	71,442	71,442
Issuance of common stock	302		302
Excess tax benefits from stock-based compensation	73		73
Dividends on preferred stock	(5,872)		(2,936)		(2,936)
Deemed dividend resulting from modification of redeemable convertible preferred stock	(2,929)				(2,929)
Other comprehensive income	(1,238)			(1,238)
Net income	11,433				11,433
Balance at Jun. 30, 2012	$ 5,885	$ 7	$ 6,575	$ (2,215)	$ 1,518
Balance, shares at Jun. 30, 2012		7,096,909

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Earnings per share - Anti-dulitive Securities Excluded from Calculation (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation (shares)	4,693,834	6,021,738	5,348,867	35,907,763
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation (shares)	4,639,939	5,953,591	5,287,959	9,036,203
Convertible preferred stock (as converted basis)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation (shares)	0	0	0	26,767,656
Convertible preferred stock warrants (as converted basis)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation (shares)	53,895	68,147	60,908	103,904

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Stock Options and Restricted Stock (Tables)

6 Months Ended

Jun. 30, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes stock option activity:

	Number of Shares		Weighted-Average Exercise Price		Aggregate Intrinsic Value(1)		Weighted-Average Remaining Contractual Term (in years)
Balance, December 31, 2011	9,086,586		$	10.79	$	86,590	7.3
Options granted (3)	626,500		$	25.03
Exercised	(71,442	)	$	18.92
Canceled/forfeited	(399,652	)	$	19.09
Balance, June 30, 2012	9,241,992		$	11.33	$	140,159	6.9
Vested and exercisable as of June 30, 2012	5,780,981		$	8.09	$	106,431	5.9
Vested and exercisable as of June 30, 2012 and expected to vest thereafter (2)	8,653,670		$	10.85	$	135,450	6.8

(1) The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying award and the fair value of $26.50, and $20.14 of our common stock on June 30, 2012, and December 31, 2011.

(2) Stock options expected to vest reflect an estimated forfeiture rate.

(3) Includes 242,500 shares granted to non-employees. The assumptions used to value these grants are similar to those used for grants made to employees with the exception of the expected term.

Schedule of Share-based Payment Awards, Valuation Assumptions

The following weighted-average assumptions were used for grants made to employees and do not include the assumptions for non-employee grants:

	June 30, 2012		December 31, 2011
Risk-free interest rate	1.0	%	1.8	%
Expected volatility	44.6	%	43.8	%
Expected life (in years)	6		6
Dividend yield	—	%	—	%

Share-based Payment Awards, Summary of Outstanding and Exercisable Options by Exersise Price Range

The following table summarizes information concerning outstanding and exercisable options as of June 30, 2012:

	Options Outstanding				Options Exercisable and Vested
Range of Exercise Prices	Number of Shares	Weighted Average Remaining Contractual Life (in Years)	Weighted- Average Exercise Price		Number of Shares	Weighted- Average Exercise Price
$  1.00 - $  1.40	971,103	2.4	$	1.16	971,103	$	1.16
$2.98	216,240	4.3	$	2.98	216,240	$	2.98
$5.00	1,362,500	4.9	$	5.00	1,362,500	$	5.00
$7.50	1,737,000	7.0	$	7.50	1,284,822	$	7.50
$11.29	255,000	7.6	$	11.29	166,041	$	11.29
$13.00	955,000	7.5	$	13.00	562,597	$	13.00
$14.82	1,905,316	8.3	$	14.82	840,814	$	14.82
$15.50 - $21.00	1,153,333	8.6	$	19.03	355,614	$	17.87
25.50 - 26.50	686,500	9.7	$	25.74	21,250	25.50
$  1.00 - $26.50	9,241,992	6.9	$	11.33	5,780,981	$	8.09

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Fair Value Measurements

6 Months Ended

Jun. 30, 2012

Liabilities, Fair Value Disclosure [Abstract]

Fair Value Measurements

Fair Value Measurements

Generally accepted accounting principles set forth a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The three tiers are Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

Our preferred stock warrants are measured at fair value on a recurring basis. The preferred stock warrants are valued using the Black-Scholes model with the following assumptions: share price, exercise price, expected term, volatility, risk-free interest rate and dividend yield as described in “—Note 11—Redeemable Convertible Preferred Stock”.

Changes in valuation during the years ended December 31, 2011 and the six months endedJune 30, 2012, were as follows:

	Level 3 Warrant Instruments
Balance, December 31, 2011	1,150
Mark-to-market adjustment	169
Balance, June 30, 2012	$	1,319

Mark-to-market adjustments related to stock put options and warrant instruments are included in other income (expense).

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Earnings per share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Schedule of computation of basic earnings per share

	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Basic earnings (loss) per share:
Net income (loss)	$	7,288		$	3,776		$	11,433		$	(3,138	)
Redeemable convertible preferred stock dividends	(2,936		)	(2,936		)	(5,872		)	$	(5,872	)
Deemed dividend resulting from modification of redeemable convertible preferred stock	$	(2,929	)	$	—		$	(2,929	)	$	—
Net income (loss) attributable to common stockholders—Basic	$	1,423		$	840		$	2,632		$	(9,010	)
Weighted average common shares outstanding	7,049,863			7,505,505			7,043,571			7,451,737
Basic earnings (loss) per share	$	0.20		$	0.11		$	0.37		$	(1.21	)

Schedule of computation of diluted earnings per share

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Diluted earnings (loss) per share:
Net income (loss) attributable to common stockholders—Diluted	$	7,288	$	3,776	$	11,433	$	(9,010	)
Weighted average common shares outstanding	7,049,863		7,505,505		7,043,571		7,451,737
Options to purchase common stock	4,602,055		3,082,612		3,954,035		—
Convertible preferred stock (as converted basis)	26,767,656		26,767,656		26,767,656		—
Contingent preferred stock per Election and Amendment Agreement (1)	151,111		—		151,111		—
Convertible preferred stock warrants (as converted basis)	50,009		35,757		42,996		—
Weighted average shares and potential diluted shares	38,620,694		37,391,530		37,959,369		7,451,737
Diluted earnings (loss) per share	$	0.19	$	0.10	$	0.30	$	(1.21	)

(1) Additional preferred stock per Election and Amendment Agreement as discussed in “-Note 11-Redeemable Convertible Preferred Stock." Shares calculated based on common stock fair value of $26.50 as of June 30, 2012.

Schedule of anti-dilutive securities excluded from computation of earnings per share

The potentially dilutive securities that have been excluded from the calculation of diluted net income (loss) per common share because the effect is anti-dilutive is as follows:

	Three Months Ended June 30,		Six Months Ended June 30,
	2012	2011	2012	2011
Options to purchase common stock	4,639,939	5,953,591	5,287,959	9,036,203
Convertible preferred stock (as converted basis)	—	—	—	26,767,656
Convertible preferred stock warrants (as converted basis)	53,895	68,147	60,908	103,904
	4,693,834	6,021,738	5,348,867	35,907,763

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Information about Geographic Areas

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

Information about Geographic Areas

Information about Geographic Areas

Revenues by geography are based on the country in which our websites are located. For example, KAYAK.com is in the United States, while de.KAYAK.com and swoodoo.com are in Germany. We allocate revenues based on the website’s proportional revenue-generating activity (generally, volume of queries and clicks relative to the whole). Long-lived assets are allocated based on the location of the corporate entity to which they relate.

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Revenues
United States	$	61,957	$	46,890	$	121,125	$	92,116
Germany	6,635		5,761		14,237		11,173
Rest of the world	8,346		4,102		14,914		6,138
Total revenues	$	76,938	$	56,753	$	150,276	$	109,427

	As of June 30,		As of December 31,
	2012		2011
Long-lived assets
United States	$	147,390	$	149,254
Germany	18,956		20,205
Rest of the world	8,729		9,376
Total long-lived assets	$	175,075	$	178,835

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Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities
Net income (loss)	$ 11,433	$ (3,138)
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	4,100	4,402
Stock-based compensation expense	5,840	6,191
Excess tax benefits from exercise of stock options	(73)	(226)
Deferred taxes	(2,819)	(9,811)
Mark to market adjustments	169	(916)
Impairment of intangible assets	0	14,980
Other	0	121
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable, net	(13,277)	(8,901)
Prepaid expenses and other current assets	461	2,989
Accounts payable	6,871	5,870
Accrued liabilities and other liabilities	8,171	(3,061)
Net cash from operating activities	20,876	8,500
Cash flows from investing activities
Capital expenditures	(1,162)	(1,068)
Purchase of marketable securities	(7,481)	(18,182)
Maturities of marketable securities	7,651	6,699
Cash paid for business combinations, net of cash acquired	0	(9,194)
Net cash from investing activities	(992)	(21,745)
Cash flows from financing activities
Proceeds from exercise of stock options	302	682
Tax benefits realized from exercise of stock options	73	226
Cash paid for expenses in connection with initial public offering	(411)	(1,118)
Net cash from financing activities	(36)	(210)
Effect of exchange rate changes on cash and cash equivalents	(425)	465
Increase (decrease) in cash and cash equivalents	19,423	(12,990)
Cash and cash equivalents, beginning of period	35,127	34,966
Cash and cash equivalents, end of period	54,550	21,976
Cash paid during the period for:
Interest	0	0
Income taxes	$ 11,040	$ 7,331

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Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Accounts receivable, net of allowance for doubtful accounts	$ 3,354	$ 3,581
Redeemable convertible preferred stock, shares authorized	26,876,384	26,876,384
Series A Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, par value	$ 0.001	$ 0.001
Redeemable convertible preferred stock - liquidation preference	13,200
Redeemable convertible preferred stock, shares authorized	6,600,000	6,600,000
Redeemable convertible preferred stock, shares issued	6,600,000	6,600,000
Redeemable convertible preferred stock, shares outstanding	6,600,000	6,600,000
Series A1 Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, par value	$ 0.001	$ 0.001
Redeemable convertible preferred stock - liquidation preference	3,228
Redeemable convertible preferred stock, shares authorized	1,176,051	1,176,051
Redeemable convertible preferred stock, shares issued	1,176,051	1,176,051
Redeemable convertible preferred stock, shares outstanding	1,176,051	1,176,051
Series B Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, par value	$ 0.001	$ 0.001
Redeemable convertible preferred stock - liquidation preference	13,598
Redeemable convertible preferred stock, shares authorized	4,989,308	4,989,308
Redeemable convertible preferred stock, shares issued	4,989,308	4,989,308
Redeemable convertible preferred stock, shares outstanding	4,989,308	4,989,308
Series B1 Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, par value	$ 0.001	$ 0.001
Redeemable convertible preferred stock - liquidation preference	5,616
Redeemable convertible preferred stock, shares authorized	2,138,275	2,138,275
Redeemable convertible preferred stock, shares issued	2,138,275	2,138,275
Redeemable convertible preferred stock, shares outstanding	2,138,275	2,138,275
Series C Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, par value	$ 0.001	$ 0.001
Redeemable convertible preferred stock - liquidation preference	21,467
Redeemable convertible preferred stock, shares authorized	3,897,084	3,897,084
Redeemable convertible preferred stock, shares issued	3,855,180	3,855,180
Redeemable convertible preferred stock, shares outstanding	3,855,180	3,855,180
Series D Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock, par value	$ 0.001	$ 0.001
Redeemable convertible preferred stock - liquidation preference	$ 294,115
Redeemable convertible preferred stock, shares authorized	8,075,666	8,075,666
Redeemable convertible preferred stock, shares issued	8,008,842	8,008,842
Redeemable convertible preferred stock, shares outstanding	8,008,842	8,008,842
Common Stock
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized	50,000,000	45,000,000
Common stock, shares issued	7,096,909	7,025,467
Common stock, shares outstanding	7,096,909	7,025,467
Common Class A [Member]
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Pro Forma [Member] | Common Class B [Member]
Common stock, par value (usd per share)	$ 0.001
Common stock, shares authorized	50,000,000
Common stock, shares issued	33,864,565
Common stock, shares outstanding	33,864,565

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2012

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Operating Leases

We lease our office and data center facilities under noncancelable leases that expire at various points between May 2013 and April 2025. We are also responsible for certain real estate taxes, utilities and maintenance costs on our office facilities. Rent expense was approximately $332 and $426 for the three months endedJune 30, 2012 and 2011 respectively and $671 and $897 for the six months endedJune 30, 2012 and 2011 respectively.

Other Commitments

We have a content licensing agreement that as of June 30, 2012, obligates us to make minimum future payments of $3,500 for the remainder of 2012. During 2013, we will be obligated to make minimum payments based on the number of queries performed in 2012, and as a result, we are unable to estimate our calendar year 2013 minimum commitment at this time. If not renewed, this agreement expires in December 2013.

On April 3, 2012, we entered into a Products and Services Agreement with a technology provider. This agreement obligates us to make minimum future payments of $1,600 per year for the next four years. As of June 30, 2012, our remaining obligation for 2012 is $800 .

Legal Matters

We are involved in various legal proceedings, including but not limited to the matters described below that involve claims for substantial amounts of money or for other relief or that might necessitate changes to our business or operations.

In April 2009, Parallel Networks, LLC filed a complaint against us for patent infringement in the U.S. District Court for the Eastern District of Texas. The complaint alleged, among other things, that our website technology infringes a patent owned by Parallel Networks purporting to cover a “Method And Apparatus For Client-Server Communication Using a Limited Capability Client Over A Low-Speed Communications Link” (U.S. Patent No. 6,446,111 B1) and sought injunctive relief, monetary damages, costs and attorneys fees. The complaint was dismissed without prejudice in February 2010, but the plaintiff filed a new complaint against us on March 29, 2010 containing similar allegations. The case was set for trial on September 10, 2012. The court has since stayed proceedings in the district court pending resolution of plaintiff’s appeal of certain rulings by the court, which granted summary judgment on several claims in favor of us and other defendants. At this time we are unable to estimate any potential damages associated with this matter. As such, we have not recorded any accrual for potential loss as of December 31, 2011 or June 30, 2012.

In addition, from time to time, we may become involved in legal proceedings arising in the ordinary course of our business. Such proceedings, even if not meritorious, could result in the expenditure of significant financial and managerial resources. If any legal proceedings were to result in an unfavorable outcome, it could have a material adverse effect on our business, financial position and results of operations; however, at this time, we are unable to estimate the potential range of loss, if any, and it is too early to determine the likelihood of whether or not any of these claims will ultimately result in a loss. As such, we have not recorded any material accrual for potential loss as of December 31, 2011 or June 30, 2012.

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DEI Document	6 Months Ended
	Jun. 30, 2012	Aug. 15, 2012 Common Class A [Member]	Aug. 15, 2012 Common Class B [Member]
Entity Information [Line Items]
Entity registrant name	KAYAK Software Corp
Trading symbol	KYAK
Entity central index key	0001312928
Current fiscal year end date	--12-31
Entity filer category	Non-accelerated Filer
Document type	10-Q
Document period end date	Jun. 30, 2012
Document fiscal year focus	2012
Document fiscal period focus	Q2
Amendment flag	false
Entity common stock, shares outstanding		4,577,170	33,937,749

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Redeemable Convertible Preferred Stock

6 Months Ended

Jun. 30, 2012

Temporary Equity [Abstract]

Redeemable Convertible Preferred Stock

Redeemable Convertible Preferred Stock

The Company had authorized 26,876,384 shares of redeemable convertible preferred stock, and had designated six series as of June 30, 2012 and December 31, 2011: 6,600,000 shares of Series A Preferred, 1,176,051 shares of Series A-1 Preferred, 4,989,308 shares of Series B Preferred, 2,138,275 shares of Series B-1 Preferred, 3,897,084 shares of Series C Preferred and 8,075,666 Series D Preferred.

Series A Preferred

In March and June 2004, the Company issued an aggregate of 6,600,000 shares of Series A Preferred at $1.00 per share for gross proceeds of $6,600.

Series A-1 Preferred

In November 2004, the Company issued an aggregate of 825,000 shares of Series A-1 Preferred at $2.00 per share for gross proceeds of $1,650. The purchase price of the shares was subject to adjustment based on any dilution occurring as a result of any subsequent stock offering that occurred prior to February 1, 2006 at a price per share lower than $2.00. Consequently, in March 2005, an additional 351,051 shares were issued to Series A-1 holders to adjust the stock purchase price to $1.403 per share, the per-share price of the Series B Preferred Stock.

Series B Preferred

In February 2005, the Company issued 4,989,308 shares of its Series B Preferred at $1.403 per share for gross proceeds of $7,000.

Series B-1 Preferred

In April 2006, the Company issued 2,138,275 shares of its Series B-1 Preferred at $1.403 per share for gross proceeds of $3,000.

Series C Preferred

In May 2006, the Company issued 3,855,180 shares of its Series C Preferred at $2.983 per share for gross proceeds of $11,500.

Series D Preferred

In December 2007, the Company issued 8,008,842 shares of its Series D Preferred at $20.727 per share for gross proceeds of $166,000 and $278 in issuance costs.

A summary of the rights and preferences of the Series A, A-1, B, B-1, C and D Preferred, as of June 30, 2012, are as follows:

Voting

Series A, A-1, B, B-1, C and D Preferred stockholders are entitled to one vote per common share equivalent on all matters voted on by holders of common stock.

Dividends

Series A, A-1, B, B-1, C and D Preferred stockholders are entitled to receive dividends that are paid on common stock of the Company equal to an amount of the largest number of whole shares of common stock into which the shares of preferred stock are convertible. In addition, Series A, A-1, B, B-1, C and D preferred stockholders are entitled to receive, out of funds legally available, dividends at the rate of 6% per annum of the adjusted original issue price per share and are accumulated regardless if declared. Accumulated and unpaid dividends totaled $57,617 and $51,745 as of June 30, 2012, and December 31, 2011 respectively. Dividends are payable upon a liquidation event, redemption or if declared by the Board of Directors.

In April 2012, the Company executed an Election and Amendment Agreement with certain existing stockholders, or eligible holders, pursuant to which we granted certain eligible holders the right to purchase from us 352,178 shares of common stock at the IPO price of $26.00. We refer to these as the private placement purchase rights. The private placement purchase rights must be exercised, if at all within five business days after the closing of our IPO.

Pursuant to the Election and Amendment Agreement, if our IPO price was below $27.00 per share, we agreed that we would issue to the eligible holders additional shares of Class A common stock for no additional consideration pursuant to an automatic adjustment. As a result of the revision in the terms due to the Election and Amendment Agreement, we recognized a charge of $2,929 as a deemed dividend at the modification date. This charge impacts net income (loss) attributable to our common stockholders and basic net income (loss) per share attributable to common stockholders.

Liquidation Rights

In the event of a liquidation, dissolution or winding up of the Company, a sale of all or substantially all of the Company’s assets, and certain mergers, before any distribution payments to common stockholders, the holders of Series A, A-1, B, B-1, C and D Preferred are entitled to an amount equal to the liquidation preference payment. The liquidation preference payment is equal to the original stock price paid per share multiplied by 1.5 for the Series A holders ($1.50 per share), Series A-1 holders ($2.104 per share), Series B holders ($2.104 per share), Series B-1 holders ($2.104 per share), Series C holders ($4.475 per share) and Series D holders ($31.09 per share) plus unpaid dividends (whether or not declared).

Conversion

Each share of Series A, A-1, B, B-1, C and D preferred is convertible into one share of common stock, adjusted for certain anti-dilutive events. Conversion is at the option of the holder but becomes automatic upon (i) the completion of an IPO involving gross proceeds of at least $25,000 at a price per share that equals or exceeds $31.09 per share, subject to certain adjustments, or (ii) upon the election of the holders of shares of preferred stock representing 58% of the votes applicable to such preferred stock (Requisite Holders), provided that with respect to Series D Preferred, such election must also include holders of at least two-thirds of the Series D preferred. Upon a conversion event holders are not entitled to receive any previously accumulated and unpaid dividends.

Redemption

At any time on or after December 21, 2012, upon the written request of the Requisite Holders, the Company shall redeem, in three equal annual installments, all outstanding Series A, A-1, B, B-1, C and D Preferred, in cash, at an amount equal to the adjusted original issue price plus unpaid dividends. In February 2012, we obtained waivers from more than the Requisite Holders agreeing not to elect any such redemption until after January 2, 2013.

Preferred Stock Warrants

In connection with the issuance of subordinated term loans in 2007, the lender received warrants to purchase 62,000 shares of Series D preferred stock at an exercise price of $20.73 per share. The warrants expire on the tenth anniversary of the loan closing date (December 2017). In connection with the transaction the Company recorded a separate warrant liability based on the estimated fair value at the issuance date by allocating proceeds first to the warrants and the remaining to the loans (the residual method). Warrants are valued at each reporting period with changes recorded as other income (expense) in the statement of operations. The fair value of these warrants was $489 and $426 at June 30, 2012 and December 31, 2011 respectively, based on the following assumptions using the Black-Scholes model:

	June 30, 2012		December 31, 2011
Risk free interest rate	0.4	%	0.4	%
Expected volatility	41.2	%	42.9	%
Expected life (in years)	3		3
Dividend yield	—	%	—	%

The mark-to-market expense on these warrants was $(84) and $(183) for the three months endedJune 30, 2012 and June 30, 2011 respectively and $(63) and $(66) for the six months endedJune 30, 2012 and June 30, 2011 respectively.

In November 2006, under the terms of a loan and security agreement, the Company issued warrants for the purchase of 41,904 shares of Series C preferred. The warrants are exercisable at $2.983 per share and expire on November 22, 2016. The Company recorded a warrant liability based on the fair value of the warrants at the issuance date. The fair value of these warrants was $830 and $724 as of June 30, 2012 and December 31, 2011, respectively, based on the following assumptions using the Black-Scholes model:

	June 30, 2012		December 31, 2011
Risk free interest rate	0.3	%	0.3	%
Expected volatility	42.0	%	41.0	%
Expected life (in years)	2		2
Dividend yield	—	%	—	%

The mark-to-market expense on these warrants was $(106) and $(55) for the three months endedJune 30, 2012 and June 30, 2011 respectively and $(106) and $(143) for the six months endedJune 30, 2012 and June 30, 2011 respectively.

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Consolidated Statements of Operations (unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Statement [Abstract]
Revenues	$ 76,938	$ 56,753	$ 150,276	$ 109,427
Cost of revenues (excludes depreciation and amortization)	4,807	4,684	9,992	9,629
Selling, general and administrative expenses:
Marketing	39,409	30,025	80,658	58,482
Personnel	11,306	9,800	23,219	19,839
Other general and administrative expenses	3,615	4,164	8,447	8,381
Total selling, general and administrative expenses (excludes depreciation and amortization)	54,330	43,989	112,324	86,702
Depreciation and amortization	2,050	2,341	4,100	4,402
Impairment of intangible assets	0	0	0	14,980
Income (loss) from operations	15,751	5,739	23,860	(6,286)
Other income (expense)
Interest income	47	24	68	45
Other income (expense)	(613)	306	(809)	917
Total other income (expense)	(566)	330	(741)	962
Income (loss) before taxes	15,185	6,069	23,119	(5,324)
Income tax expense (benefit)	7,897	2,293	11,686	(2,186)
Net income (loss)	7,288	3,776	11,433	(3,138)
Redeemable convertible preferred stock dividends declared	(2,936)	(2,936)	(5,872)	(5,872)
Deemed dividend resulting from modification of redeemable convertible preferred stock	(2,929)	0	(2,929)	0
Net income (loss) attributed to common stockholders	$ 1,423	$ 840	$ 2,632	$ (9,010)
Net income (loss) per common share
Basic	$ 0.20	$ 0.11	$ 0.37	$ (1.21)
Diluted	$ 0.19	$ 0.10	$ 0.30	$ (1.21)
Weighted average common shares
Basic	7,049,863	7,505,505	7,043,571	7,451,737
Diluted	38,620,694	37,391,530	37,959,369	7,451,737

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Property and Equipment

6 Months Ended

Jun. 30, 2012

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and Equipment

Property and equipment consisted of the following:

	Estimated Life	June 30,			December 31,
		2012			2011
Website development	3 years	$	6,022		$	5,552
Computer equipment	3 years	4,669			4,172
Leasehold improvements	Life of lease	2,310			2,283
Furniture and fixtures	5 years	793			749
Software	3 years	305			266
Vehicles	5 years	53			53
Office equipment	5 years	40			40
Property and equipment		14,192			13,115
Accumulated depreciation		(8,924		)	(7,641		)
Property and equipment, net		$	5,268		$	5,474

Depreciation expense was $650 and $441 for the three months endedJune 30, 2012 and 2011 respectively and $1,285 and $867 for the six months endedJune 30, 2012 and 2011 respectively.

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Marketable Securities

6 Months Ended

Jun. 30, 2012

Marketable Securities [Abstract]

Marketable Securities

Marketable Securities

The following tables summarize the investments in marketable securities all of which are classified as held to maturity:

	June 30, 2012				December 31, 2011
	Amortized Cost		Level  1(1) Fair Value		Amortized Cost		Level  1(1) Fair Value
Agency bonds	$	1,001	$	1,001	$	2,605	$	2,605
Certificate of deposit	900		900		900		899
Commercial paper	3,594		3,595		3,097		3,096
Corporate debentures/ bonds	5,417		5,414		4,596		4,591
Marketable securities	$	10,912	$	10,910	$	11,198	$	11,191

(1) Level 1 fair values are defined as observable inputs such as quoted prices in active markets.

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Related Party Transactions

6 Months Ended

Jun. 30, 2012

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

In March 2010, we sold TravelPost, a website that was acquired in 2007, to a corporation affiliated with certain members of our board of directors. In connection with the sale, we entered into a commercial agreement pursuant to which we granted the new company a three-year license to reproduce and publicly display hotel reviews and hotel related information in exchange for a monthly license fee of $50 for the term of the license. In May 2011, the commercial agreement was amended to lower the monthly license fee to $10 in exchange for 1,000,000 shares of Series A Preferred Stock in TravelPost. No value was attributed to the stock.

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Stockholders' Equity

6 Months Ended

Jun. 30, 2012

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Common Stock

A summary of the rights and preferences of common stock as of June 30, 2012 are as follows:

Voting

Common stockholders are entitled to one vote per share of common stock held on all matters on which such common stockholder is entitled to vote.

Dividends

Common stockholders are eligible to receive dividends on common stock held when funds are available and as approved by the Board of Directors.

Liquidation Rights

In the event of liquidation, dissolution or winding up of the Company, a sale of all or substantially all of the Company’s assets, and certain mergers, common stockholders are entitled to receive all assets of the Company available for distribution, subject to the preferential rights of any outstanding shares of preferred stock.

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Accrued Expenses and Other Current Liabilities

6 Months Ended

Jun. 30, 2012

Accounts Payable and Accrued Liabilities, Current [Abstract]

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following:

	June 30, 2012		December 31, 2011
Accrued bonus	$	3,475	$	5,792
Income taxes payable	5,939		2,515
Accrued marketing	7,812		1,141
Other accrued expenses	7,534		6,772
Accrued expenses and other current liabilities	$	24,760	$	16,220

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Fair Value Measurements (Details) (Level 3 [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning balance	$ 1,150
Mark-to-market adjustment	169
Balance, ending balance	$ 1,319

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Intangible Assets

6 Months Ended

Jun. 30, 2012

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Intangible Assets

Intangible Assets

The following tables detail our intangible asset balances by major asset class:

	June 30, 2012							December 31, 2011
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Impairment			Net Carrying Amount
Intangible asset class
Domain and trade names	$	33,345	$	(26,628	)	$	6,717	$	33,505	$	(11,255	)	$	(14,980	)	$	7,270
Customer relationships	10,651		(4,569		)	6,082		10,878		(3,826		)	—			7,052
Technology	4,141		(2,672		)	1,469		4,160		(1,287		)	—			2,873
Non-compete agreements	954		(659		)	295		982		(493		)	—			489
Intangible assets, net	$	49,091	$	(34,528	)	$	14,563	$	49,525	$	(16,861	)	$	(14,980	)	$	17,684

Amortization expense was $1,400 and $1,900 for the three months endedJune 30, 2012, and June 30, 2011 respectively, and $2,815 and $3,535 for the six months endedJune 30, 2012 and June 30, 2011 respectively. Intangible assets are amortized on a straight-line basis over their estimated economic lives. We believe that the straight-line method of amortization reflects an appropriate allocation of the cost of the intangible assets to earnings in proportion to the amount of economic benefits obtained.

In January 2011, we determined that we would not support two brand names and URLs in the United States and decided that we would begin to migrate all traffic from sidestep.com to KAYAK.com. As a result of this triggering event, we prepared an analysis comparing expected future discounted cash flows to be generated by the SideStep domain and trade name asset to the carrying value of the asset. Our analysis resulted in:

• A charge of $14,980 due to the impairment of the value of the SideStep brand name and URL,

• A change in estimate that resulted in acceleration of amortization based on the estimated decline in queries directed from our SideStep URL through December 2013 to reflect the gradual transition of users to the KAYAK URL.

To determine fair value of the SideStep brand name and URL, we used an income approach, which utilized Level 3 fair value inputs as described in "-Note 15 - Fair Value Measurements", and discounted the expected cash flows of the intangible assets. We calculated expected cash flows, using an estimate of future revenue to be generated from the SideStep URL offset by estimated future expenses. We applied a discount rate of 17% representing the estimated weighted average cost of capital, which reflects the overall level of inherent risk involved in the respective operations and the rate of return an outside investor could expect to earn.

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Goodwill

6 Months Ended

Jun. 30, 2012

Goodwill Disclosure [Abstract]

Goodwill

Goodwill

Changes in the carrying amount of goodwill for the year endedDecember 31, 2011 and six months endedJune 30, 2012 were as follows:

Balance, December 31, 2011	$	155,677
Foreign currency translation	(433		)
Balance, June 30, 2012	$	155,244

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Income Taxes

6 Months Ended

Jun. 30, 2012

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Our effective tax rates were 52.0% and 37.8% for the three months endedJune 30, 2012 and 2011. The increase in the effective tax rate for the three months endedJune 30, 2012 as compared to the same period in 2011 was primarily due to losses in Europe for which no benefit was recognized.

Our effective tax rates were 50.5% and 41.0% for the six months endedJune 30, 2012 and 2011. The increase in the effective tax rate for the six months endedJune 30, 2012 as compared to the same period in 2011 was primarily due to losses in Europe for which no benefit was recognized.

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Subsequent Events (unaudited) (Details) (USD $)	6 Months Ended			0 Months Ended		0 Months Ended				0 Months Ended
	Jun. 30, 2012		Apr. 30, 2012	Aug. 01, 2012 Subsequent Event [Member]	Jul. 19, 2012 Subsequent Event [Member]	Aug. 01, 2012 Common Class A [Member] Subsequent Event [Member]	Jul. 25, 2012 Common Class A [Member] Subsequent Event [Member]	Jun. 30, 2012 Common Stock	Dec. 31, 2011 Common Stock	Jul. 19, 2012 Common Stock Subsequent Event [Member]	Jul. 25, 2012 IPO [Member] Subsequent Event [Member]	Jul. 25, 2012 IPO [Member] Common Class A [Member] Subsequent Event [Member]	Jul. 25, 2012 IPO [Member] Common Class B [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Sale of common stock (shares)												4,025,000
Options granted, weighted average exercise price (usd per share)	$ 25.03	[1]								$ 26		$ 26
Proceeds from issuance of initial public offering											$ 97,300,000
Cash paid for expenses in connection with initial public offering											3,800,000
Common stock, shares issued								7,096,909	7,025,467				33,864,565
Options granted, number of shares	626,500	[1]								1,300,000
Estimated rate of stock options vested					25.00%
Total unrecognized estimated compensation expense, non-vested options					14,800,000
Shares issued during the period (shares)							308,032
Number of shares entited by rights issued			352,178				352,178
Exercise price of rights (usd per share)			26				26
Issuance of common stock, shares						231,695
Proceeds from issuance of common stock				$ 6,000,000

[1] Includes 242,500 shares granted to non-employees. The assumptions used to value these grants are similar to those used for grants made to employees with the exception of the expected term.

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Information about Geographic Areas Schedule of Long-lived Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Long-lived Assets [Line Items]
Long-Lived Assets	$ 175,075	$ 178,835
United States
Long-lived Assets [Line Items]
Long-Lived Assets	147,390	149,254
Germany
Long-lived Assets [Line Items]
Long-Lived Assets	18,956	20,205
Rest of the world [Member]
Long-lived Assets [Line Items]
Long-Lived Assets	$ 8,729	$ 9,376

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Redeemable Convertible Preferred Stock (Tables)

6 Months Ended

Jun. 30, 2012

Series C Redeemable Convertible Preferred Stock [Member]

Temporary Equity [Line Items]

Fair Value Inputs

	June 30, 2012		December 31, 2011
Risk free interest rate	0.3	%	0.3	%
Expected volatility	42.0	%	41.0	%
Expected life (in years)	2		2
Dividend yield	—	%	—	%

Series D Redeemable Convertible Preferred Stock [Member]

Temporary Equity [Line Items]

Fair Value Inputs

	June 30, 2012		December 31, 2011
Risk free interest rate	0.4	%	0.4	%
Expected volatility	41.2	%	42.9	%
Expected life (in years)	3		3
Dividend yield	—	%	—	%

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Redeemable Convertible Preferred Stock (Details) (USD $)	3 Months Ended		6 Months Ended				4 Months Ended			1 Months Ended				1 Months Ended			1 Months Ended			1 Months Ended			1 Months Ended	6 Months Ended		6 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 series	Jun. 30, 2011	Apr. 30, 2012	Dec. 31, 2011	Jun. 30, 2004 Series A Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2012 Series A Redeemable Convertible Preferred Stock [Member]	Dec. 31, 2011 Series A Redeemable Convertible Preferred Stock [Member]	Mar. 31, 2005 Series A1 Redeemable Convertible Preferred Stock [Member]	Nov. 30, 2004 Series A1 Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2012 Series A1 Redeemable Convertible Preferred Stock [Member]	Dec. 31, 2011 Series A1 Redeemable Convertible Preferred Stock [Member]	Feb. 28, 2005 Series B Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2012 Series B Redeemable Convertible Preferred Stock [Member]	Dec. 31, 2011 Series B Redeemable Convertible Preferred Stock [Member]	Apr. 30, 2006 Series B1 Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2012 Series B1 Redeemable Convertible Preferred Stock [Member]	Dec. 31, 2011 Series B1 Redeemable Convertible Preferred Stock [Member]	May 31, 2006 Series C Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2012 Series C Redeemable Convertible Preferred Stock [Member]	Dec. 31, 2011 Series C Redeemable Convertible Preferred Stock [Member]	Dec. 31, 2007 Series D Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2012 Series D Redeemable Convertible Preferred Stock [Member]	Dec. 31, 2011 Series D Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2012 Redeemable Convertible Preferred Stock [Member]	Dec. 31, 2011 Redeemable Convertible Preferred Stock [Member]	Jun. 30, 2012 Minimum [Member]
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares authorized	26,876,384		26,876,384			26,876,384		6,600,000	6,600,000			1,176,051	1,176,051		4,989,308	4,989,308		2,138,275	2,138,275		3,897,084	3,897,084		8,075,666	8,075,666
Number of series of preferred stock issued			6
Redeemable convertible preferred stock, redemption price (usd per share)							$ 1			$ 1.403	$ 2			$ 1.403			$ 1.403			$ 2.983			$ 20.727
Proceeds from issuance of redeemable convertible preferred stock							$ 6,600,000				$ 1,650,000			$ 7,000,000			$ 3,000,000			$ 11,500,000			$ 166,000,000
Temporary equity, stock issued during period (shares)							6,600,000			351,051	825,000			4,989,308			2,138,275			3,855,180			8,008,842
Expenses paid for issuance of redeemable convertible preferred stock																							278,000
Dividend rate entitled to preferred stockholdres																										6.00%
Accumulated and unpaid dividends																										57,617,000	51,745,000
Number of shares entited by rights issued					352,178																41,904			62,000
Exercise price of rights (usd per share)					26																2.983			20.73
Share price lower threshold	$ 27		$ 27
Deemed dividend resulting from modification of redeemable convertible preferred stock	2,929,000	0	2,929,000	0
Liquidation preference, multiplier			1.5
Liquidation preference per share (usd per share)								$ 1.50				$ 2.104			$ 2.104			$ 2.104			$ 4.475			$ 31.09
Automatic converstion threshold, gross proceeds upon completion of IPO																												$ 25,000,000
Automatic converstion threshold, minimum share price (usd per share)			$ 31.09
Automatic converstion threshold, votes needed			58.00%																					67.00%

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Earnings per share

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Earnings per share

Earnings per share

The following tables set forth the computation of basic and diluted earnings (loss) per share of common stock for the three and six months ended June 30, 2012 and June 30, 2011 were as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Basic earnings (loss) per share:
Net income (loss)	$	7,288		$	3,776		$	11,433		$	(3,138	)
Redeemable convertible preferred stock dividends	(2,936		)	(2,936		)	(5,872		)	$	(5,872	)
Deemed dividend resulting from modification of redeemable convertible preferred stock	$	(2,929	)	$	—		$	(2,929	)	$	—
Net income (loss) attributable to common stockholders—Basic	$	1,423		$	840		$	2,632		$	(9,010	)
Weighted average common shares outstanding	7,049,863			7,505,505			7,043,571			7,451,737
Basic earnings (loss) per share	$	0.20		$	0.11		$	0.37		$	(1.21	)

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Diluted earnings (loss) per share:
Net income (loss) attributable to common stockholders—Diluted	$	7,288	$	3,776	$	11,433	$	(9,010	)
Weighted average common shares outstanding	7,049,863		7,505,505		7,043,571		7,451,737
Options to purchase common stock	4,602,055		3,082,612		3,954,035		—
Convertible preferred stock (as converted basis)	26,767,656		26,767,656		26,767,656		—
Contingent preferred stock per Election and Amendment Agreement (1)	151,111		—		151,111		—
Convertible preferred stock warrants (as converted basis)	50,009		35,757		42,996		—
Weighted average shares and potential diluted shares	38,620,694		37,391,530		37,959,369		7,451,737
Diluted earnings (loss) per share	$	0.19	$	0.10	$	0.30	$	(1.21	)

(1) Additional preferred stock per Election and Amendment Agreement as discussed in “-Note 11-Redeemable Convertible Preferred Stock." Shares calculated based on common stock fair value of $26.50 as of June 30, 2012.

The potentially dilutive securities that have been excluded from the calculation of diluted net income (loss) per common share because the effect is anti-dilutive is as follows:

	Three Months Ended June 30,		Six Months Ended June 30,
	2012	2011	2012	2011
Options to purchase common stock	4,639,939	5,953,591	5,287,959	9,036,203
Convertible preferred stock (as converted basis)	—	—	—	26,767,656
Convertible preferred stock warrants (as converted basis)	53,895	68,147	60,908	103,904
	4,693,834	6,021,738	5,348,867	35,907,763

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2012

Accounting Policies [Abstract]

Significant Estimates and Judgments

Significant Estimates and Judgments

The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America 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 financial statements and the reported amounts of revenue and expenses during the reporting period. Significant estimates relied upon in preparing these financial statements include the provision for uncollectible accounts, estimates used to determine the fair value of our common stock, preferred stock, put option, stock-based compensation and preferred stock warrants, recoverability of our net deferred tax assets and the fair value of long lived assets and goodwill. Changes in estimates are recorded in the period in which they become known. We base estimates on historical experience and various other assumptions that we believe to be reasonable under the circumstances. Actual results may differ from our estimates.

Principles of Concolidation

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, and have been prepared in accordance with accounting principles generally accepted in the United States of America. Operating results of acquired businesses are included in the consolidated statements of operations from the date of acquisition. All intercompany accounts and transactions have been eliminated. We have reclassified certain prior period amounts  to conform to our current period presentation.

The interim financial statements and footnotes are unaudited. In the opinion of our management, these statements include all adjustments, which are of a normal recurring nature, necessary to present a fair statement of the Company’s results of operations, financial position and cash flows. Interim results are not necessarily indicative of financial results for a full year. The interim information included in this Form 10-Q should be read in conjunction with our prospectus filed with the Securities and Exchange Commission, or SEC, pursuant to Rule 424 (b) on July 20, 2012 relating to our initial public offering, or IPO.

Foreign Currency Translation

Foreign Currency Translation

Assets and liabilities for our international operations are translated to U.S. dollars at current exchange rates in effect at the balance sheet date. Income and expense accounts are translated at average exchange rates in effect during the year. Resulting translation adjustments are recorded as a separate component of accumulated other comprehensive income.

The financial statements of non-U.S. entities are translated from their functional currencies into U.S. dollars. Assets and liabilities are translated at period end rates of exchange and revenue and expenses are translated using average rates of exchange. The resulting gain or loss is included in accumulated other comprehensive income on the balance sheet.

Segments

Segments

We have one operating segment for financial reporting purposes: travel search.

Revenue Recognition

Revenue Recognition

KAYAK’s services are free for travelers. We earn revenues by sending referrals to travel suppliers and Online Travel Agents, OTAs after a traveler selects a specific itinerary (distribution revenues), and through advertising placements on our websites and mobile applications (advertising revenues).

We recognize distribution revenue upon completion of the referral, provided that our fees are fixed and determinable, there is persuasive evidence of an arrangement and collection is reasonably assured. Advertising revenues are recognized when a traveler clicks on an advertisement that a customer has placed on our website or when we display an advertisement.

Distribution Revenues

We earn distribution revenues by sending qualified leads to travel suppliers and OTAs and by facilitating bookings directly through our websites and mobile applications. After a traveler has entered a query on our website, reviewed the results, and decided upon a specific itinerary, we send the user directly into the travel supplier's or OTA's purchase process to complete the transaction. In many cases, users may now complete bookings with the travel supplier or OTA without leaving our websites and mobile applications. Travel suppliers and OTAs have the flexibility to pay us either when these qualified leads click on a query result at a set cost per click, or CPC basis, or when they purchase a travel product on the travel supplier or OTA website which we refer to as a cost per acquisition, or CPA, basis. We separately negotiate and enter into our distribution agreements, and these agreements set forth the payment terms for the applicable travel supplier or OTA

Advertising Revenues

Advertising revenues primarily come from payments for compare units, text-based sponsored links and display advertisements. A “compare unit” is an advertising placement that, if selected by a KAYAK user, launches the advertiser’s website and initiates a query based on the same travel parameters provided on the KAYAK website. The major types of advertisers on our websites consist of OTAs, third party sponsored link providers, hotels, airlines and vacation package providers. Generally, our advertisers pay us on a CPC basis, which means advertisers pay us only when someone clicks on one of their advertisements, or on a cost per thousand impression basis, or CPM. Paying on a CPM basis means that advertisers pay us based on the number of times their advertisements appear on our websites.

Cost of Revenues

Cost of Revenues

Cost of revenues consists primarily of expenses incurred related to airfare query costs, data center costs and related bandwidth charges. All costs of revenues are expensed as incurred.

Marketing

Marketing

Marketing expenses are comprised primarily of costs of search engine and other digital marketing, brand advertising, affiliate referral fees, and public relations. All marketing costs are expensed as incurred.

Share-based Compensation

Stock-Based Compensation

We estimate the value of stock option awards on the date of grant using the Black-Scholes option-pricing model (the Black-Scholes model). The determination of the fair value of stock option awards on the date of grant is affected by our estimated stock price as well as assumptions regarding a number of complex and subjective variables. These variables include our expected stock price volatility over the term of the awards, expected term, risk-free interest rate, expected dividends and expected forfeiture rates. The forfeiture rate is estimated using historical option cancellation information, adjusted for anticipated changes in exercise and employment termination behavior. Outstanding awards do not contain market or performance conditions and therefore, we recognize stock-based compensation expense on a straight-line basis over the requisite service period.

We account for stock options issued to non-employees in accordance with the guidance for equity-based payments to non-employees. Stock option awards to non-employees are accounted for at fair value using the Black-Scholes option-pricing model. Our management believes that the fair value of stock options is more reliably measured than the fair value of the services received. The fair value of the unvested portion of the options granted to non-employees is re-measured each period. The resulting increase or decrease in value, if any, is recognized during the period the related services are rendered. The fair value of each non-employee stock-based compensation award is re-measured each period until a commitment date is reached, which is generally the vesting date.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

The carrying amounts of the Company’s cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities, approximate fair value because of their short maturities.

Cash Equivalents

Cash equivalents include all highly liquid investments maturing within 90 days from the date of purchase.

Marketable Securities

Marketable securities are classified as held-to-maturity as we have the intent and ability to hold these investments to maturity. Marketable securities are reported at amortized cost. Cash equivalents and marketable securities are invested in instruments we believe to be of high-quality, primarily money market funds, U.S. Government obligations, State and Municipality obligations and corporate bonds with remaining contractual maturities of less than one year.

Accounts Receivable and Allowance for Doubtful Accounts

Accounts Receivable and Allowance for Doubtful Accounts

We review accounts receivable on a regular basis and estimate an amount of losses for uncollectible accounts based on our historical collections experience, age of the receivable and knowledge of the customer. We record changes in our estimate to the allowance for doubtful accounts through bad debt expense and relieve the allowance when accounts are ultimately collected or determined to be uncollectible.

Deferred Financing Costs Related to Intial Public Offering

Deferred Financing Costs Related to Initial Public Offering

As of June 30, 2012 and December 31, 2011 we had incurred $3,314 and $2,173, respectively, of legal and accounting costs related to our IPO. We capitalize such costs in prepaid expense and other current assets and will net these costs against the proceeds received from the IPO which occurred on July 25, 2012.

Property and Equipment

Property and Equipment

Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation of property and equipment is computed on a straight-line basis over the estimated useful lives of the assets or, when applicable, the life of the lease, whichever is shorter.

Software and Website Development Costs

Software and Website Development Costs

Certain costs to develop internal use computer software are capitalized provided these costs are expected to be recoverable. These costs are included in property and equipment and are amortized over three years beginning when the asset is substantially ready for use. Costs incurred during the preliminary project stage, as well as maintenance and training costs are expensed as incurred.

Impairment of Long-Lived Assets

Impairment of Long-Lived Assets

Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. When such events occur, we compare the carrying amounts of the assets to their undiscounted expected future cash flows. If this comparison indicates that there is impairment, the amount of the impairment is calculated as the difference between the carrying value and fair value.

Goodwill

Goodwill

Goodwill represents the excess of the cost of acquired business over the fair value of the assets acquired at the date of acquisition. Goodwill is tested for impairment at least annually and whenever events or changes in circumstances indicate that goodwill may be impaired. Goodwill is not deductible for tax purposes.

We assess goodwill for possible impairment using a two-step process. The first step identifies if there is potential goodwill impairment. If step one indicates that an impairment may exist, a second step is performed to measure the amount of the goodwill impairment, if any. Goodwill impairment exists when the estimated fair value of goodwill is less than its carrying value. If impairment exists, the carrying value of the goodwill is reduced to fair value through an impairment charge in our consolidated statements of operations.

For purposes of goodwill impairment testing, we estimate the fair value of the Company using generally accepted valuation methodologies, including market and income based approaches, and relevant data available through and as of the testing date. The market approach is a valuation method in which fair value is estimated based on observed prices in actual transactions and on asking prices for similar assets. Under the market approach, the valuation process is essentially that of comparison and correlation between the subject asset and other similar assets. The income approach is a method in which fair value is estimated based on the cash flows that an asset could be expected to generate over its useful life, including residual value cash flows. These cash flows are then discounted to their present value using a rate of return that accounts for the relative risk of not realizing the estimated annual cash flows and for the time value of money.

Warrant Liability

Warrant liability

Warrants to purchase redeemable convertible preferred stock are accounted for on the balance sheets at fair value as liabilities. Changes in fair value are recognized in earnings in the period of change.

Income Taxes

Income Taxes

We record income taxes under the liability method. Interest and penalties related to income tax liabilities, if any, are included in income tax expense. Deferred tax assets and liabilities reflect our estimation of the future tax consequences of temporary differences between the carrying amounts of assets and liabilities for book and tax purposes. We determine deferred income taxes based on the differences in accounting methods and timing between financial statement and income tax reporting. Accordingly, we determine the deferred tax asset or liability for each temporary difference based on the enacted tax rates expected to be in effect when we realize the underlying items of income and expense. We consider many factors when assessing the likelihood of future realization of our deferred tax assets, including our recent earnings experience by jurisdiction, expectations of future taxable income, and the carryforward periods available to us for tax reporting purposes, as well as other relevant factors. We may establish a valuation allowance to reduce deferred tax assets to the amount we believe is more likely than not to be realized. Due to inherent complexities arising from the nature of our businesses, future changes in income tax law, tax sharing agreements or variances between our actual and anticipated operating results, we make certain judgments and estimates. Therefore, actual income taxes could materially vary from these estimates.

Effective January 1, 2007, we adopted the authoritative guidance for uncertainty in income taxes. This guidance requires that we recognize a tax benefit from an uncertain position only if it is more likely than not that the position is sustainable, based solely on its technical merits and consideration of the relevant taxing authority’s widely understood administrative practices and precedents. If this threshold is met, we would measure the tax benefit as the largest amount of benefit that is greater than fifty percent likely of being realized upon ultimate settlement. The adoption of this guidance did not have a material impact on our financial statements. Penalties and interest on uncertain tax positions are included in income tax expense.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In June 2011, the FASB issued amended disclosure requirements for the presentation of comprehensive income. The amended guidance eliminates the option to present components of other comprehensive income (OCI) as part of the statement of changes in equity. Under the amended guidance, all changes in OCI are to be presented either in a single continuous statement of comprehensive income or in two separate but consecutive financial statements. We adopted these changes effective January 1, 2012 and applied retrospectively for all periods presented. There was no impact to the consolidated results as the amendments related only to changes in financial statement presentation.

In September 2011, the FASB issued amended guidance that will simplify how entities test goodwill for impairment. After an assessment of certain qualitative factors, if it is determined to be more likely than not that the fair value of a reporting unit is less than its carrying amount, entities must perform the quantitative analysis of the goodwill impairment test. Otherwise, the quantitative test becomes optional. The guidance is effective January 1, 2012, with early adoption permitted. We elected to adopt this guidance for the 2011 goodwill impairment test performed in the fourth quarter. Goodwill impairment testing did not result in any impact to our financial results.

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Income Taxes (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Tax Disclosure [Abstract]
Effective tax rates	52.00%	37.80%	50.50%	41.00%

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Acquisitions (Details) (JaBo Software [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended
	Apr. 02, 2011
JaBo Software [Member]
Business Acquisition [Line Items]
Percentage of outstanding share capital acquired	100.00%
Total purchase price, net	$ 9,160
Weighted average useful life of intangible assets acquired	7 years

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Consolidated Statements of Comprehensive Income (Loss) (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Statement of Other Comprehensive Income [Abstract]
Net income (loss)	$ 7,288	$ 3,776	$ 11,433	$ (3,138)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	(2,392)	898	(1,238)	2,484
Other comprehensive income (loss)	(2,392)	898	(1,238)	2,484
Total comprehensive income (loss)	$ 4,896	$ 4,674	$ 10,195	$ (654)

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Acquisitions

6 Months Ended

Jun. 30, 2012

Business Combinations [Abstract]

Acquisitions

Acquisitions

On April 1, 2011, the Company acquired 100% of the outstanding share capital in JaBo Vertrieb-und Entwicklung GmbH, or JaBo Software, a leading Austrian travel search company, for a total cash purchase price of $9,160, net.

The table below sets forth the final purchase price allocation:

Assets acquired:
Accounts receivable and other assets	$	983
Contingent asset	230
Identifiable intangible assets (1)
Customer relationships (useful life—7 years)	3,200
Trade & domain names (useful life—10 years)	2,600
Current technology (useful life—2 years)	700
Non-compete agreements (useful life—2 years)	300
Goodwill	4,138
Total assets	12,151
Liabilities assumed:
Deferred tax liability	1,700
Other liabilities	1,291
Total net assets acquired	$	9,160

(1) The weighted average useful life of the identifiable intangible assets acquired is 7 years.

The primary elements that generated goodwill are the value of the acquired assembled workforce, specialized processes and procedures and operating synergies, none of which qualify as separate intangible assets.

The pro forma impact of this acquisition on revenues and net income was immaterial.

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Earnings per share - Computation of Diluted (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Dec. 31, 2011
Earnings Per Share, Diluted [Abstract]
Net income (loss) attributable to common stockholders—Diluted	$ 7,288		$ 3,776		$ 11,433		$ (9,010)
Weighted average common shares outstanding (shares)	7,049,863		7,505,505		7,043,571		7,451,737
Options to purchase common stock (shares)	4,602,055		3,082,612		3,954,035		0
Convertible preferred stock (as converted basis) (shares)	26,767,656		26,767,656		26,767,656		0
Contingent preferred stock per Election and Amendment Agreement (shares)	151,111	[1]	0	[1]	151,111	[1]	0	[1]
Convertible preferred stock warrants (as converted basis) (shares)	50,009		35,757		42,996		0
Weighted average shares and potential diluted shares (shares)	38,620,694		37,391,530		37,959,369		7,451,737
Diluted earnings (loss) per share (usd per share)	$ 0.19		$ 0.10		$ 0.30		$ (1.21)
Common stock, fair value (usd per share)	$ 26.50				$ 26.50				$ 20.14

[1] Additional preferred stock per Election and Amendment Agreement as discussed in “-Note 11-Redeemable Convertible Preferred Stock." Shares calculated based on common stock fair value of $26.50 as of June 30, 2012.

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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2012

Accounting Policies [Abstract]

Concentrations of Credit Risk

Significant customers accounted for the following percentages of total revenues:

	Three Months Ended June 30,		Six Months Ended June 30,
	2012	2011	2012	2011
Customer A	26%	24%	24%	25%
Customer B	9%	8%	10%	8%
Customer C	8%	12%	9%	13%

Amounts due from these significant customers were:

	June 30,		December 31,
	2012		2011
Customer A	$	11,438	$	7,354
Customer B	3,259		1,511
Customer C	4,070		4,242

We believe significant customer amounts outstanding at June 30, 2012 and December 31, 2011 are collectible.

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Information about Geographic Areas (Tables)

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

Scedule of Revenue by Geographic Area

Long-lived assets are allocated based on the location of the corporate entity to which they relate.

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Revenues
United States	$	61,957	$	46,890	$	121,125	$	92,116
Germany	6,635		5,761		14,237		11,173
Rest of the world	8,346		4,102		14,914		6,138
Total revenues	$	76,938	$	56,753	$	150,276	$	109,427

Schedule of Long-lived Assets by Geographic Area

	As of June 30,		As of December 31,
	2012		2011
Long-lived assets
United States	$	147,390	$	149,254
Germany	18,956		20,205
Rest of the world	8,729		9,376
Total long-lived assets	$	175,075	$	178,835

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Stock Options and Restricted Stock

6 Months Ended

Jun. 30, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Options and Restricted Stock

Stock Options and Restricted Stock

The board of directors adopted the 2004 Stock Option Plan, or the 2004 Plan, and the Third Amended and Restated 2005 Equity Incentive Plan, or the 2005 Plan, which permits the sale or award of restricted common stock or grant of incentive and nonqualified stock options for the purchase of common stock to employees, directors and consultants up to a maximum aggregate of 13,000,000 shares and 12,000,000 shares at June 30, 2012 and December 31, 2011, respectively. At June 30, 2012 and December 31, 2011, 933,098 shares and 159,946 shares, respectively, were available under the 2005 Plan for future issuances of restricted common stock or grants of stock options.

Restricted Stock

The Company has issued shares of restricted common stock to employees, directors and consultants, which are subject to repurchase agreements and generally either vest over a four-year period from date of grant or immediately at the time of the grant. If the holder ceases to have a business relationship with the Company, the Company may repurchase any unvested shares of restricted common stock held by these individuals at their original purchase price. There were no unvested shares at June 30, 2012 or December 31, 2011.

Restricted stock is subject to transfer restrictions and contains the same rights and privileges as unrestricted shares of common stock. Shares of restricted stock are presented as outstanding as of the date of issuance. Grants made during 2010 and 2011 all vested immediately as of the date of the grant. There were no restricted stock grants between January 1, 2012 and June 30, 2012.

Stock Options

Stock options generally have terms of ten years. Stock options granted under the stock plans will typically vest 25% after the first year of service and ratably each month over the remaining 36-month period contingent upon employment with the Company on the date of vesting.

The Company utilizes the Black-Scholes model to determine the fair value of stock options. Management is required to make certain assumptions with respect to selected model inputs, including anticipated changes in the underlying stock price (i.e., expected volatility) and option exercise activity (i.e., expected term). The Company bases its expected volatility on the historical volatility of comparable publicly traded companies for a period that is equal to the expected term of the options. The expected term of options granted is derived using the “simplified” method as allowed under the provisions of the SEC’s Staff Accounting Bulletin No. 107 and represents the period of time that options granted are expected to be outstanding. The expected term for performance-based and non-employee awards is based on the period of time for which each award is expected to be outstanding, which is typically the remaining contractual term. The risk-free rate is based on the U.S. Treasury yield in effect at the time of the grant period for a period commensurate with the estimated expected life.

The following table summarizes stock option activity:

	Number of Shares		Weighted-Average Exercise Price		Aggregate Intrinsic Value(1)		Weighted-Average Remaining Contractual Term (in years)
Balance, December 31, 2011	9,086,586		$	10.79	$	86,590	7.3
Options granted (3)	626,500		$	25.03
Exercised	(71,442	)	$	18.92
Canceled/forfeited	(399,652	)	$	19.09
Balance, June 30, 2012	9,241,992		$	11.33	$	140,159	6.9
Vested and exercisable as of June 30, 2012	5,780,981		$	8.09	$	106,431	5.9
Vested and exercisable as of June 30, 2012 and expected to vest thereafter (2)	8,653,670		$	10.85	$	135,450	6.8

(1) The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying award and the fair value of $26.50, and $20.14 of our common stock on June 30, 2012, and December 31, 2011.

(2) Stock options expected to vest reflect an estimated forfeiture rate.

(3) Includes 242,500 shares granted to non-employees. The assumptions used to value these grants are similar to those used for grants made to employees with the exception of the expected term.

The fair value of vested shares was $5,655 for the six months endedJune 30, 2012 and $10,885 during the year endedDecember 31, 2011. The total intrinsic value of options exercised was $462 for the six months endedJune 30, 2012 and $4,143 during the year endedDecember 31, 2011.

The weighted-average fair value of options granted during the six months endedJune 30, 2012 was $12.72 per share and $9.71 per share for the year endedDecember 31, 2011 based on the Black-Scholes model. The following weighted-average assumptions were used for grants made to employees and do not include the assumptions for non-employee grants:

	June 30, 2012		December 31, 2011
Risk-free interest rate	1.0	%	1.8	%
Expected volatility	44.6	%	43.8	%
Expected life (in years)	6		6
Dividend yield	—	%	—	%

The following table summarizes information concerning outstanding and exercisable options as of June 30, 2012:

	Options Outstanding				Options Exercisable and Vested
Range of Exercise Prices	Number of Shares	Weighted Average Remaining Contractual Life (in Years)	Weighted- Average Exercise Price		Number of Shares	Weighted- Average Exercise Price
$  1.00 - $  1.40	971,103	2.4	$	1.16	971,103	$	1.16
$2.98	216,240	4.3	$	2.98	216,240	$	2.98
$5.00	1,362,500	4.9	$	5.00	1,362,500	$	5.00
$7.50	1,737,000	7.0	$	7.50	1,284,822	$	7.50
$11.29	255,000	7.6	$	11.29	166,041	$	11.29
$13.00	955,000	7.5	$	13.00	562,597	$	13.00
$14.82	1,905,316	8.3	$	14.82	840,814	$	14.82
$15.50 - $21.00	1,153,333	8.6	$	19.03	355,614	$	17.87
25.50 - 26.50	686,500	9.7	$	25.74	21,250	25.50
$  1.00 - $26.50	9,241,992	6.9	$	11.33	5,780,981	$	8.09

The fair value of the common stock has been determined by the Board of Directors at each award grant date based on a variety of factors, including arm’s length sales of the Company’s capital stock (including redeemable convertible preferred stock), valuations of comparable public companies, the Company’s financial position and historical financial performance, the status of technological developments within the Company’s products, the composition and ability of the technology and management team, an evaluation of and benchmark to the Company’s competition, the current climate in the marketplace, the illiquid nature of the common stock, the effect of rights and preferences of preferred shareholders, and the prospects of a liquidity event, among others. In addition, at least quarterly the Company performs a valuation to assist in determining the current market value of the stock.

At June 30, 2012 and December 31, 2011, total unrecognized estimated compensation expense related to non-vested stock options granted prior to that date was approximately $29,345 and $31,124, respectively. This expense will be recognized on a straight-line basis over the weighted average remaining vesting period of 2.4 and 2.6 years as of June 30, 2012, and December 31, 2011, respectively.