Stockholders' Equity

12 Months Ended

Dec. 31, 2011

Stockholders' Equity Attributable to Parent [Abstract]

Stockholders' Equity

STOCKHOLDERS’ EQUITY

Equity Offering

In March 2011, Acacia completed a public offering of 5,750,000 shares of common stock. The public offering price was $31.50 per share, and the net proceeds to the Company totaled approximately $175,229,000, after deducting underwriting discounts and related offering expenses. Acacia retained broad discretion over the use of the net proceeds from the sale of common stock and intends to use the net proceeds for operations and for other general corporate purposes, including, but not limited to, working capital, strategic acquisitions and other transactions.

Repurchase of Restricted Common Stock

In May 2009, Acacia’s board of directors approved a restricted stock vesting net issuance program.  Under the program, upon the vesting of unvested shares of restricted common stock, Acacia withheld from fully vested shares of common stock otherwise deliverable to any employee-participant in Acacia’s equity compensation programs, a number of whole shares of common stock having a fair market value (as determined by Acacia as of the date of vesting) equal to the amount of tax required to be withheld by law, in order to satisfy the tax withholding obligations of Acacia in connection with the vesting of such shares.  Of a total of 580,600 shares of restricted stock vested between June 2009 and September 2009, 174,628 shares of common stock were withheld by Acacia, in satisfaction of $1,107,000 in required withholding tax liability.