14.     Stock-Based Compensation

Stock Options

On December 31, 2004, the Company adopted a stock incentive plan (the “2004 Plan”). The 2004 Plan provided for the grant of options to employees, consultants, and non-employee directors to purchase common stock, which vest over time and have a ten-year contractual term. To satisfy options granted under the 2004 Plan, the Company made common stock available from authorized but unissued shares or shares held in treasury, if any, by the Company. Stock options granted under the 2004 Plan were either incentive stock options or non-qualified stock options, as defined in the 2004 Plan agreement. Stock options were granted with an exercise price no less than the fair-market-value price of the common stock at the date of the grant.

The 2004 Plan has a change in control provision whereby if a change in control occurs and the participant’s awards are not equitably adjusted, such awards shall become fully vested and exercisable and all forfeiture restrictions on such awards shall lapse. Based on the terms of the 2004 Plan, the Company’s initial public offering did not trigger the change in control provision and did not result in any modifications to the outstanding equity awards under the 2004 Plan.

On February 3, 2010, the Board of Directors approved an increase to the number of shares of the Company’s common stock available for issuance under the 2004 Plan by 1,875,230 shares.

On June 22, 2010, the Board of Directors approved the 2010 Long-Term Incentive Plan (“2010 Plan”), effective upon the closing of the Company’s initial public offering. The 2010 Plan provides for the grant of options, stock appreciation rights, Full Value Awards (as defined in the 2010 Plan) and cash incentive awards to employees, consultants, and non-employee directors to purchase common stock, which vest over time and have a ten-year contractual term. The maximum number of shares of common stock that may be delivered under the 2010 Plan is equal to the sum of 2,700,000 plus the number of shares of common stock that are subject to outstanding awards under the 2004 Plan which are forfeited, expire or are cancelled after the effective date of the Company’s initial public offering. Stock options and stock appreciation rights are granted with an exercise price no less than the fair-market-value price of the common stock at the date of the grant. As of December 31, 2011, the maximum number of options available for future issuance under the 2010 Plan is 2,363,908.

Employee stock-based compensation expense was as follows:

The following weighted average assumptions were used to value options granted during the periods indicated:

The following table summarizes option activity under the 2004 Plan and 2010 Plan:

The aggregate intrinsic values in the table above represent the total pre-tax intrinsic value (the aggregate difference between the fair value of the Company’s common stock on December 31, 2011, 2010 and 2009 of $11.96, $17.06 and $11.50 respectively, and the exercise price of in-the-money options) that would have been received by the option holders had all option holders exercised their options as of that date.

Exercise prices of stock options outstanding as of December 31, 2011 range from $1.10 to $13.45.

Other information was as follows:

The following table summarizes the prices whereby the Company granted employee stock options from the period January 1, 2009 through July 27, 2010 (the date prior to the Company’s initial public offering):

Prior to our initial public offering on July 28, 2010, the Board of Directors determined the exercise price was the fair market value on the respective grant dates. Historically, determining the fair value of our common stock required making subjective judgments. The valuation of the Company’s common stock considered a market approach and an income approach, incorporating the Company’s historical and expected financial performance, relevant market, industry and economic trends, recent capital transactions, involving either the Company or comparable companies, and comparable public company valuations. The resulting calculation assigns a value for 100% of our Company’s equity on a marketable equivalent, non-controlling interest basis.

After the value of the Company had been determined, the Company allocated the value to each class of its shares, including common stock. The value allocation methodology applies the principles set forth in the AICPA Practice Aid—Valuation of Privately-Held-Company Equity Securities Issued as Compensation (“Practice Aid”). The Practice Aid defines appropriate methods to allocate enterprise value to common shares when multiple share classes exist. Based on various factors, including the stage of a company’s life and the timing and likelihood of various liquidity events, one method of allocation may be more appropriate than the others. The Company used the option pricing method, as defined in the Practice Aid, which treats each class of equity as having a “call option” on the enterprise value. The option pricing method considers the economic preferences and other rights attributable to each share class, resulting in a price for each of the share classes, including common stock. The valuations of common stock also reflected a discount for lack of marketability, adjusted over time to reflect the expected likelihood and timing of a liquidity event subsequent to each valuation date. No other discounts were applied in determining the value of the Company’s common stock. There was inherent uncertainty in the estimates used in the valuations. If different discount rates, assumptions or weightings had been used, the valuations would have been different. From January 1, 2009 through July 27, 2010, the Company performed contemporaneous valuations to determine the fair value of the Company’s common stock at the following dates:

Since our initial public offering on July 28, 2010, the Company has not performed internal valuations or obtained independent valuations in order to determine the Company’s stock price to reference when determining the fair value of our common stock in connection with the granting of stock options.

Restricted Stock Awards

The Company grants restricted stock awards to employees that vest one-third on each of the first three anniversaries of the grant date. The following is a summary of the activity for unvested restricted stock awards during the year ended December 31, 2011:

At December 31, 2011, there was $6.4 million of unrecognized compensation cost related to unvested stock options and restricted stock awards which the Company expects to recognize over a weighted-average period of 2.4 years.