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</td></tr></table> The following table presents the detail of accrued liabilities for the periods presented (in thousands):   <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="76%" align="center"> <tr><td width="74%"> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center">December 31,</td> <td valign="bottom"> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2011</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2010</td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Accrued vacation and employee-related expenses</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">15,709</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">6,215</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Exercise of unvested stock options</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">4,806</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,563</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Accrued incentives</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">24,600</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">11,807</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Accrued sales tax and value-added taxes</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">5,839</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,638</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Other accrued expenses</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">7,690</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,378</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr><td valign="top"> Total</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">58,644</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">27,601</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td></tr></table> </div> -792000 -792000 -767000 -767000 -3704000 -3704000 25857000 44826000 81448000 143000 128000 15000 8684000 13594000 118000 1318000 382000 -2115000 -5798000 -5271000 177318000 177318000 2583755 177700000 6287000 680000 3438000 4995000 448000 1811000 3109000 2648000 2231000 10974000 70365 -433000 -433000 792000 767000 3704000

12886000

28217000

58263000

111372000

27601000

58644000

-3000

100000

25074000

617629000

6270000

9146000

30292000

2672000

5460000

238188000

873697000

172206000

725927000

80495000

89979000

92951000

339048000

9484000

2972000

246097000

0.0001

43308742

40637575

60842819

43308742

40637575

60842819

4000

10000

103827000

123482000

223523000

496344000

64985000

139798000

6625000

18551000

11854000

19551000

43100000

<div> <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"> <tr><td valign="top" width="4%" align="left">12.</td> <td valign="top" align="left">Redeemable Convertible Preferred Stock and Stockholders' Equity </td></tr></table> Initial Public Offering In May 2011, the Company closed its IPO of 9,016,000 shares of its Class A common stock, which included 6,003,804 shares of Class A common stock sold by the Company (inclusive of 1,176,000 shares of Class A common stock from the full exercise of the overallotment option of shares granted to the underwriters) and 3,012,196 shares of Class A common stock sold by the selling stockholders. The public offering price of the shares sold in the offering was $45.00 per share. The Company did not receive any proceeds from the sales of shares by the selling stockholders. The total gross proceeds from the offering to the Company were $270.2 million. After deducting underwriting discounts and commissions and offering expenses payable by the Company, the aggregate net proceeds received by the Company totaled approximately $248.4 million. Follow-on Offering In November 2011, the Company closed its follow-on offering of 10,062,500 shares of its Class A common stock, which included 2,583,755 shares of Class A common stock sold by the Company (inclusive of 1,312,500 shares of Class A common stock from the full exercise of the overallotment option of shares granted to the underwriters) and 7,478,745 shares of Class A common stock sold by the selling stockholders. The public offering price of the shares sold in the offering was $71.00 per share. The Company did not receive any proceeds from the sales of shares by the selling stockholders. The total gross proceeds from the offering to the Company were $178.1 million. After deducting underwriting discounts and commissions and offering expenses payable by the Company, the aggregate net proceeds received by the Company totaled approximately $177.3 million. Preferred Stock Prior to its IPO, the Company had outstanding 17,238,579 shares designated as Series A convertible preferred stock, 17,450,991 shares designated as Series B convertible preferred stock, 4,357,644 designated as Series C redeemable convertible preferred stock and 6,599,987 designated as Series D redeemable convertible preferred stock. Each share of preferred stock was convertible into one share of common stock. Immediately prior to the completion of the Company's IPO on May 19, 2011, all shares of outstanding preferred stock automatically converted into 45,647,201 shares of the Company's Class B common stock. Warrant In connection with the line of credit agreement, on September 20, 2004, the Company issued a warrant to purchase 70,365 shares of Series A convertible preferred stock with an exercise price of $0.32 per share. The fair value of the warrant, based on an option valuation model, which approximates a binomial lattice model, was insignificant and was reflected as a discount to borrowings under the financing. The warrant was exercisable for seven years from the date of issuance. In May 2010, the warrant was exercised. As a result, the Company issued 70,365 shares of Series A convertible preferred stock and received an insignificant amount of proceeds. Common Stock At December 31, 2010, there were 120,000,000 shares of common stock authorized, and 43,308,742 shares issued and outstanding. Following its IPO on May 19, 2011, the Company had two classes of authorized common stock outstanding; Class A common stock and Class B common stock. As of December 31, 2011, there were 40,637,575 shares and 60,842,819 shares of Class A common stock and Class B common stock, respectively, issued and outstanding.   Common Stock Reserved for Future Issuance As of December 31, 2011, the Company had reserved the following shares of common stock for future issuances in connection with the following:   <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="76%" align="center"> <tr><td width="83%"> </td> <td valign="bottom" width="4%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Options outstanding</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">14,784,701</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Restricted stock units outstanding</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,139,910</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Available for future stock option and restricted stock unit grants</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">12,585,455</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Available for future employee stock purchase plan options</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,335,633</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Total available for future issuance</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">31,845,699</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr></table> Equity Incentive Plans The Company has two equity incentive plans: the Amended and Restated 2003 Stock Incentive Plan (the "2003 Plan") and the 2011 Equity Incentive Plan (the "2011 Plan"). Under the 2003 Plan, 34,814,756 shares of common stock were reserved for the issuance of incentive stock options ("ISOs"), nonstatutory stock options ("NSOs"), or to eligible participants as of December 31, 2010. Upon the IPO, 2,000,000 shares were initially reserved under the 2011 Plan and all shares that were reserved under the 2003 Plan but not issued were assumed by the 2011 Plan. Following the IPO, any shares subject to options or other similar awards granted under the 2003 Plan that expire, are forfeited, are repurchased by us or otherwise terminate unexercised will become available under the 2011 Plan. As of December 31, 2011 the total number of shares available under the 2011 Plan is 29,300,703 shares. No additional shares will be issued under the 2003 Plan. Under the 2011 Plan, the Company has the ability to issue ISOs, NSOs, stock appreciation rights, restricted stock, restricted stock units ("RSUs"), performance units and/or performance shares. The ISOs and NSOs will be granted at a price per share not less than the fair value at date of grant. Options granted to date generally vest over a four-year period with 25% vesting at the end of one year and the remaining vest monthly thereafter. Options granted generally are exercisable up to 10 years. The Company began granting RSUs in June 2011, which generally vest over a four-year period with 25% vesting at the end of one year and the remaining vest quarterly thereafter. Early Exercise of Stock Options The Company typically allows employees to exercise options granted under the 2003 Plan prior to vesting. The unvested shares are subject to the Company's repurchase right at the original purchase price. The proceeds initially are recorded as an accrued liability from the early exercise of stock options (see Note 8, Accrued Liabilities), and reclassified to common stock as the Company's repurchase right lapses. The Company has issued common stock of approximately 980,000 and 655,000 shares during the years ended December 31, 2011 and 2010, respectively, for stock options exercised prior to vesting. During the years ended December 31, 2011 and 2010, the Company repurchased 21,830 and 233,812 shares, respectively, of common stock related to unvested stock options, at the original exercise price due to the termination of employees. At December 31, 2011 and 2010, 789,137 and 981,172 shares held by employees and directors were subject to repurchase at an aggregate price of $4.8 million and $3.6 million, respectively. On March 3, 2009, the Company's Board of Directors approved an executive loan program. The program allowed certain executives of the Company to exercise options to purchase common stock of the Company granted to them by executing promissory notes payable to the Company in an aggregate principal amount not to exceed $0.8 million per participating executive. The loan program contained provisions to ensure compliance with federal securities laws, which prohibit companies from extending credit to certain executives. The Company had the right to repurchase some or all of the shares by cancellation of the notes in advance of filing a registration statement with the SEC. As of December 31, 2010, $3.6 million of promissory notes payable to the Company were outstanding, but not recorded within the consolidated balance sheet as the notes were considered in substance non-recourse. There were no promissory notes outstanding as of December 31, 2011 as they were repaid in full during 2011.   Employee Stock Purchase Plan Concurrent with the effectiveness of the Company's registration statement on Form S-1 on May 18, 2011, the Company's 2011 Employee Stock Purchase Plan (the "ESPP") became effective. The ESPP allows eligible employees to purchase shares of the Company's Class A common stock at a discount through payroll deductions of up to 10% of their eligible compensation, subject to any plan limitations. The ESPP provides for six-month offering periods, and at the end of each offering period, employees are able to purchase shares at 85% of the lower of the fair market value of the Company's Class A common stock on the first trading day of the offering period or on the last day of the offering period. Employees purchased 164,367 shares of common stock at an exercise price of $38.25 in November 2011. As of December 31, 2011, approximately 3,335,633 shares remained available for future issuance. Stock Option Activity A summary of stock option activity for the year ended December 31, 2011 is as follows:   <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%" align="center"> <tr><td width="54%"> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center">Options Outstanding</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" rowspan="2" colspan="2" align="center">Weighted- Average Remaining Contractual Term (in years)</td> <td valign="bottom" rowspan="2"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" rowspan="2" colspan="2" align="center">Aggregate Intrinsic Value (in thousands)</td> <td valign="bottom" rowspan="2"> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">Number of Shares</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">Weighted- Average Exercise Price</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Outstanding—December 31, 2010</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">15,202,015</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">3.97</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td></tr> <tr><td valign="top"> Granted</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">4,036,415</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">24.51</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Exercised</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(3,665,152</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3.97</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td></tr> <tr><td valign="top"> Canceled or expired</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(788,577</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">8.22</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Outstanding—December 31, 2011</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">14,784,701</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">9.35</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">7.83</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">794,071</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr><td valign="top"> Options vested and expected to vest as of December 31, 2011</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">14,132,939</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">8.97</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">7.80</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">764,340</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Options vested and exercisable as of December 31, 2011</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">5,195,327</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">3.02</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6.97</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">311,684</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr></table> Aggregate intrinsic value represents the difference between the Company's closing stock price of its common stock and the exercise price of outstanding, in-the-money options. The Company's closing stock price as reported on the New York Stock Exchange as of December 31, 2011 was $63.01. The total intrinsic value of options exercised was approximately $177.5 million, $6.0 million and $0.7 million for the years ended December 31, 2011, 2010 and 2009, respectively. The weighted-average grant date fair value of options granted was $13.28, $3.99 and $1.68 for the years ended December 31, 2011, 2010 and 2009, respectively. As of December 31, 2011, total unrecognized compensation cost, adjusted for estimated forfeitures, related to nonvested stock options was approximately $49.9 million which is expected to be recognized over the next 2.39 years.   The following table summarizes information about outstanding and vested stock options as of December 31, 2011:   <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%" align="center"> <tr><td width="39%"> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center">Options Outstanding</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center">Options Vested and Exercisable</td> <td valign="bottom"> </td></tr> <tr><td valign="bottom" nowrap="nowrap"> Exercise Price</td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">Numbers of Shares Outstanding</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">Weighted Average Remaining Contractual Life (Years)</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">Weighted Average Exercise Price</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">Number of Shares</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">Weighted Average Exercise Price</td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> $0.06 – $2.00</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">553,158</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">4.19</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0.91</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">543,882</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">0.90</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> $2.32</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">4,910,409</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">7.10</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2.32</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,239,520</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2.32</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> $3.50</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,202,758</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">7.79</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3.50</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">688,570</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3.50</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> $4.80 – $6.20</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,802,653</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">8.15</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">5.62</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">457,344</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">5.50</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> $8.27 – $14.46</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,510,956</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">8.28</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">9.77</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">243,697</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">9.47</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> $19.63</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,856,862</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">8.74</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">19.63</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">22,314</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">19.63</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> $22.59 – $45.00</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,896,395</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">9.25</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">28.11</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> $66.38 – $78.08</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">34,940</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">9.59</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">70.62</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> $78.70</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">7,280</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">9.85</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">78.70</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> $100.63</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">9,290</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">9.57</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">100.63</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Total</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">14,784,701</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">7.83</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">9.35</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">5,195,327</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">3.02</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td></tr></table> RSU Activity A summary of RSU activity for the year ended December 31, 2011, is as follows:   <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="76%" align="center"> <tr><td width="70%"> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">Number of Shares</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">Weighted- Average Grant Date Fair Value</td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Unvested—December 31, 2010</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Granted</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,155,740</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">76.09</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Released</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Canceled or expired</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(15,830</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">79.69</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Unvested—December 31, 2011</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,139,910</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">76.04</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td></tr></table> As of December 31, 2011, total unrecognized compensation cost, adjusted for estimated forfeitures, related to RSUs was approximately $69.0 million, which is expected to be recognized over the next 3.91 years. Stock-Based Compensation Expense The fair value of options granted to employees is estimated on the grant date using the Black-Scholes option valuation model. This valuation model for stock-based compensation expense requires the Company to make assumptions and judgments about the variables used in the calculation, including the fair value of the Company's common stock, the expected term (the period of time that the options granted are expected to be outstanding), the volatility of the Company's common stock, a risk-free interest rate, and expected dividends. The Company also estimates forfeitures of unvested stock options. To the extent actual forfeitures differ from the estimates, the difference will be recorded as a cumulative adjustment in the period estimates are revised. No compensation cost is recorded for options that do not vest. The Company uses the simplified calculation of expected life described in the SEC's Staff Accounting Bulletin No. 107, Share-Based Payment, and volatility is based on an average of the historical volatilities of the common stock of several entities with characteristics similar to those of the Company. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the option. The Company uses an expected dividend yield of zero, as it does not anticipate paying any dividends in the foreseeable future. Expected forfeitures are based on the Company's historical experience.   The following table presents the weighted-average assumptions used to estimate the fair value of options granted during the periods presented:   <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="84%" align="center"> <tr><td width="75%"> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center">Year Ended December 31,</td> <td valign="bottom"> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"> 2011 </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"> 2010 </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center"> 2009 </td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Volatility</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">55</td> <td valign="bottom" nowrap="nowrap">% </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">58</td> <td valign="bottom" nowrap="nowrap">% </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">67</td> <td valign="bottom" nowrap="nowrap">% </td></tr> <tr><td valign="top"> Expected dividend yield</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Risk-free rate</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2.58</td> <td valign="bottom" nowrap="nowrap">% </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2.15</td> <td valign="bottom" nowrap="nowrap">% </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2.37</td> <td valign="bottom" nowrap="nowrap">% </td></tr> <tr><td valign="top"> Expected term (in years)</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6.07</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6.08</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6.01</td> <td valign="bottom" nowrap="nowrap">  </td></tr></table> The following table presents the weighted-average assumptions used to estimate the fair value of the ESPP during the periods presented:   <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="68%" align="center"> <tr><td width="65%"> </td> <td valign="bottom" width="32%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom" colspan="2" align="center">Year Ended December 31,</td> <td valign="bottom"> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2011</td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Volatility</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">75</td> <td valign="bottom" nowrap="nowrap">% </td></tr> <tr><td valign="top"> Expected dividend yield</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Risk-free rate</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">0.06</td> <td valign="bottom" nowrap="nowrap">% </td></tr> <tr><td valign="top"> Expected term (in years)</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">0.50</td> <td valign="bottom" nowrap="nowrap">  </td></tr></table> The following table presents the amount of stock-based compensation related to stock-based awards to employees and nonemployees on the Company's consolidated statements of operations during the periods presented (in thousands):   <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="84%" align="center"> <tr><td width="68%"> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="5%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="5%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center">Year Ended December 31,</td> <td valign="bottom"> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2011</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2010</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2009</td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Cost of revenue</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">1,678</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">439</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">370</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Sales and marketing</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">8,074</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,225</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">657</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Product development</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">13,625</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,248</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,346</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> General and administrative</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6,391</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,920</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,779</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Total stock-based compensation</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">29,768</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">8,832</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6,152</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Tax benefit from stock-based compensation</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(4,679</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(1,526</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(27</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Total stock-based compensation, net of tax effect</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">25,089</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">7,306</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">6,125</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr></table> During the years ended December 31, 2011, 2010 and 2009, the Company capitalized $0.5 million, $0.3 million and $0.1 million, respectively, of stock-based compensation as website development costs. Management modified or accelerated the vesting terms for certain employee options, which resulted in an additional $1.4 million and $0.1 million of stock-based compensation expense for the years ended December 31, 2011 and 2009, respectively. There were no material modifications to stock option awards for the year ended December 31, 2010. On February 24, 2009, the Company's Board of Directors approved a common stock option repricing whereby previously granted and unexercised options held by current employees with exercise prices above $2.32 were repriced to $2.32 per share which represented the per share fair value of the Company's common stock as of the date of the repricing, with no modification to the vesting schedule of the previously issued options. As a result, 2,429,750 options originally granted to purchase common stock at prices ranging from $2.50 to $5.56 were repriced under this program. This repricing is estimated to result in incremental stock-based compensation expense of $1.0 million. Expense related to vested shares was expensed on the repricing date and expense related to nonvested shares is being amortized over the remaining term of the option. </div>

-0.10

0.08

0.15

-0.10

0.07

0.11

138000

-73000

-1310000

129000

1600000

129000

1600000

19480000

35064000

74871000

12249000

-3125000

18966000

22942000

<div> <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="100%"> <tr><td valign="top" width="4%" align="left">13.</td> <td valign="top" align="left">Income Taxes </td></tr></table> The Company accounts for income taxes in accordance with authoritative guidance, which requires the use of the asset and liability method. Under this method, deferred income tax assets and liabilities are determined based upon the difference between the consolidated financial statement carrying amounts and the tax basis of assets and liabilities and are measured using the enacted tax rate expected to apply to taxable income in the years in which the differences are expected to be reversed. The following table presents domestic and foreign components of income (loss) before income taxes for the periods presented (in thousands):   <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="84%" align="center"> <tr><td width="67%"> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="5%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="5%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center">Year Ended December 31,</td> <td valign="bottom"> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2011</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2010</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2009</td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> United States</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">28,945</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">19,275</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">(2,644</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr><td valign="top"> Foreign</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(6,003</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(309</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(481</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Total</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">22,942</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">18,966</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">(3,125</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr></table> The following table presents the components of the provision for income taxes for the periods presented (in thousands):   <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="84%" align="center"> <tr><td width="69%"> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="6%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="5%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center">Year Ended December 31,</td> <td valign="bottom"> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2011</td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2010</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2009</td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Current:</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td></tr> <tr><td valign="top"> Federal</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">11</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">107</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">129</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> State</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">204</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">541</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">560</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Foreign</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,307</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">224</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">205</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Total current</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,522</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">872</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">894</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr><td valign="top"> Deferred:</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Federal</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">8,258</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,847</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> State</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">726</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(247</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Foreign</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">524</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">109</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(46</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr><td valign="top"> Total deferred</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">9,508</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,709</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(46</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Total provision</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">11,030</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">3,581</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">848</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr></table> The following table presents a reconciliation of the statutory federal rate and the Company's effective tax rate for the periods presented:   <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="84%" align="center"> <tr><td width="75%"> </td> <td valign="bottom" width="8%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="10" align="center">Year Ended December 31,</td> <td valign="bottom"> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2011</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2010</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2009</td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> U.S. federal taxes at statutory rate</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">35</td> <td valign="bottom" nowrap="nowrap">% </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">35</td> <td valign="bottom" nowrap="nowrap">% </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">34</td> <td valign="bottom" nowrap="nowrap">% </td></tr> <tr><td valign="top"> State income taxes, net of federal benefit</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(12</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(12</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Foreign rate differential</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">11</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(1</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(10</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr><td valign="top"> Permanent differences</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">4</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(6</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Stock-based compensation</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">11</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">10</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(32</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr><td valign="top"> Change in valuation allowance</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">17</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(20</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(24</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Research and development credits</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(21</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(8</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">25</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Other</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(2</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Total</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">48</td> <td valign="bottom" nowrap="nowrap">% </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">19</td> <td valign="bottom" nowrap="nowrap">% </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(27</td> <td valign="bottom" nowrap="nowrap">)% </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr></table>   Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The following table presents the significant components of the Company's deferred tax assets and liabilities for the periods presented (in thousands):   <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="76%" align="center"> <tr><td width="72%"> </td> <td valign="bottom" width="8%"> </td> <td> </td> <td> </td> <td> </td> <td valign="bottom" width="7%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="6" align="center">December 31,</td> <td valign="bottom"> </td></tr> <tr><td valign="bottom"> </td> <td valign="bottom">  </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2011</td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td style="border-bottom: #000000 1px solid;" valign="bottom" colspan="2" align="center">2010</td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Deferred tax assets:</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td></tr> <tr><td valign="top"> Accruals and reserves</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">7,104</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">4,458</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Net operating loss carryforwards</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,685</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">3,832</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Tax credit carryforwards</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">11,842</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">4,081</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Stock-based compensation</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">6,451</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">2,486</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Other</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">93</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">199</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Total deferred tax assets</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">28,175</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">15,056</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Less valuation allowance</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(6,359</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(2,418</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Net deferred tax assets</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">21,816</td> <td valign="bottom" nowrap="nowrap">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">12,638</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Deferred tax liability:</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom"> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Prepaid expenses</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(1,860</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(831</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr><td valign="top"> Intangible assets</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(1,838</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(1,555</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Depreciation</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(31,441</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(13,360</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr><td valign="top"> Other</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(122</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">—  </td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Total deferred tax liabilities</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(35,261</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom"> </td> <td valign="bottom" align="right">(15,746</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr><td valign="top"> Total net deferred tax liabilities</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">(13,445</td> <td valign="bottom" nowrap="nowrap">) </td> <td valign="bottom"> </td> <td valign="bottom">$</td> <td valign="bottom" align="right">(3,108</td> <td valign="bottom" nowrap="nowrap">) </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr></table> Realization of deferred tax assets is dependent upon the generation of future taxable income, if any, the timing and amount of which are uncertain. Due to the history of losses the Company has generated in the past in certain jurisdictions, the Company believes that it is not more likely than not that California and Ireland deferred tax assets will be realized as of December 31, 2011. Accordingly, the Company has recorded a full valuation allowance on its deferred tax assets. The valuation allowance increased by $3.9 million and $6.2 million during the year ended December 31, 2011 and 2010, respectively. Pursuant to authoritative guidance, the benefit of stock options will only be recorded to stockholders' equity when cash taxes payable is reduced. As of December 31, 2011, the portion of net operating loss carryforwards related to stock options is approximately $51.1 million tax-effected. As of December 31, 2011, the Company had net operating loss carryforwards for federal income tax purposes of approximately $148.3 million, which expire at various dates beginning in the year 2023, if not utilized. The Company had net operating loss carryforwards for state income tax purposes of approximately $60.2 million, which expire at various dates beginning in the year 2013, if not utilized. As of December 31, 2011, the Company had research and development credit carryforwards for federal income tax purposes of approximately $13.1 million, which expire at various dates beginning in the year 2023, if not utilized. The Company had research and development credit carryforwards for state income tax purposes of approximately $9.4 million, which can be carried forward indefinitely. The Company had minimum tax credit carryforwards for federal income tax purposes of approximately $0.1 million, which can be carried forward indefinitely. Utilization of the net operating loss carryforwards and credits may be subject to a substantial annual limitation due to the ownership change limitations provided by the Internal Revenue Code of 1986, as amended and similar state provisions. The annual limitation may result in the expiration of net operating losses and credits before utilization. The Company believes an ownership change, as defined under Section 382 of the Internal Revenue Code, existed in prior years, and has reduced its net operating loss carryforwards to reflect the limitation.   As of December 31, 2011, the Company had approximately $10.7 million in total unrecognized tax benefits. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):   <table style="border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0" width="68%" align="center"> <tr><td width="84%"> </td> <td valign="bottom" width="8%"> </td> <td> </td> <td> </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Balance—December 31, 2009</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">2,887</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Tax positions related to current year—additions</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">1,805</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Balance—December 31, 2010</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">4,692</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr><td valign="top"> Tax positions related to current year—additions</td> <td valign="bottom">  </td> <td valign="bottom"> </td> <td valign="bottom" align="right">5,965</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr> <tr bgcolor="#cceeff"><td valign="top"> Balance—December 31, 2011</td> <td valign="bottom">  </td> <td valign="bottom">$</td> <td valign="bottom" align="right">10,657</td> <td valign="bottom" nowrap="nowrap">  </td></tr> <tr style="font-size: 1px;"><td valign="bottom"> </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td valign="bottom">  </td> <td> </td></tr></table> If the $10.7 million of unrecognized tax benefits as of December 31, 2011 is recognized, approximately $6.1 million would decrease the effective tax rate in the period in which each of the benefits is recognized. The remaining amount would be offset by the reversal of related deferred tax assets on which a valuation allowance is placed. The Company does not expect any material changes to its unrecognized tax benefits within the next twelve months. The Company recognizes interest and penalties related to uncertain tax positions in income tax expense. There were no interest and penalties associated with the unrecognized tax benefits accrued. As of December 31, 2011 and 2010, penalties and interest were immaterial. The Company files income tax returns in the U.S. federal jurisdiction as well as many U.S. states and foreign jurisdictions. The tax years 2003 to 2010 remain open to examination by the major jurisdictions in which the Company is subject to tax. Fiscal years outside the normal statute of limitation remain open to audit by tax authorities due to tax attributes generated in those early years which have been carried forward and may be audited in subsequent years when utilized. The Company does not provide for federal income taxes on the undistributed earnings of its foreign subsidiaries, as such earnings are to be reinvested indefinitely. It is not practicable to determine the income tax liability that might be incurred if these earnings were to be repatriated. </div>

418000

4006000

2261000

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