Subsequent Events

12 Months Ended

Dec. 31, 2012

Subsequent Events [Abstract]

Subsequent Events

14. Subsequent Events

Underwritten Public Offering

On January 9, 2013, we announced the closing of a $117.5 million underwritten public offering of approximately 2.5 million shares of common stock at a price of $47.53. The Company received net proceeds of approximately $111.1 million from this offering.

Lease Agreement for Corporate Headquarters

On January 15, 2013, the Company entered into an operating lease agreement to accommodate the Company’s continued growth and to relocate its corporate headquarters in Lexington, Massachusetts. The Company will occupy the location in stages as building modifications are completed. The Company currently anticipates that it will begin occupying a portion of the facility in May 2013. The initial lease term is for 77 months after the Company begins occupying the entire location, with an option to extend the lease term for two separate three year renewal periods (see Note 12 for additional information).