Subsequent Events

12 Months Ended

Dec. 31, 2013

Subsequent Events [Abstract]

Subsequent Events

15. Subsequent Events

On February 20, 2014, the Company entered into a lease amendment to expand the currently leased corporate headquarters located at 33 Hayden Avenue, Lexington, Massachusetts by 29,316 rentable square feet. The Company anticipates that it will occupy the expanded space in June 2014 upon the completion of landlord building modifications. The initial rent for the additional space will be $22.50 per square foot plus certain operating expenses and taxes. The Company will have the right to occupy the entire additional space upon the completion of the building modifications, but it will pay rent on only 9,524 square feet for the first two months and on 19,048 for the following eight months, before paying rent on the full 29,316 rentable square feet thereafter. The total combined leased space, including the additional space, will consist of 80,872 square feet. The initial term of the amendment begins upon the Company occupying the additional space, through December 2019, concurrent with the original lease.