Stockholders' Equity

6 Months Ended

Jun. 30, 2011

Stockholders' Equity [Abstract]

Stockholders' Equity

Note 8. Stockholders’ Equity

     In January 2011, the Company completed a public offering of 4.6 million shares of its common stock at $13.15 per share. The Company received proceeds, net of underwriting discounts and commissions, of $57.9 million ($12.43 per share) and incurred approximately $0.7 million in related offering expenses. The Company has and expects to continue to use the net proceeds of this offering for working capital and other general corporate purposes, which may potentially include the acquisition or development of new technology, the acquisition of diagnostic or related companies, products or businesses or the repayment of existing indebtedness.

     During the six months ended June 30, 2011, 204,113 shares of restricted stock were awarded, 11,051 shares of restricted stock were cancelled, 48,356 shares of common stock were issued due to the exercise of stock options and 26,928 shares of common stock were issued in connection with the Company’s employee stock purchase plan (the “ESPP”), resulting in net proceeds to the Company of approximately $0.6 million. Additionally, during the six months ended June 30, 2011, 42,423 shares of outstanding common stock were repurchased for approximately $0.6 million, which represent shares repurchased in connection with payment of minimum tax withholding obligations for certain employees relating to the lapse of restrictions on certain restricted stock awards during the six months ended June 30, 2011.