Stockholders' Equity

6 Months Ended

Jun. 30, 2011

Stockholders' Equity [Abstract]

Stockholders' Equity

Note 12. Stockholders’ Equity

In February 2010, we completed a public offering of approximately 1.77 million shares of our common stock, including the underwriter’s exercise of their overallotment to purchase 230,595 shares, at an offering price of $35.50 per share for aggregate gross proceeds of approximately $62.8 million. The underwriters for the transaction received a fee of 6% of the gross proceeds. After fees and related expenses, net proceeds from the offering were approximately $58.5 million.

The offering was completed pursuant to a prospectus supplement, dated January 27, 2010, to a shelf registration statement on Form S-3 that was previously filed with the SEC and which was declared effective on January 20, 2010. This shelf registration statement allows us to offer and sell from time to time, in one or more series or issuances and on terms that we will determine at the time of the offering, any combination of the securities described in the prospectus, up to an aggregate amount of $100 million.

In the six months ended June 30, 2011, we issued an aggregate of 17,606 shares of our common stock upon the exercise of stock options and an aggregate of 29,692 shares of our common stock upon the vesting of restricted stock units.