Commitments and contingencies

12 Months Ended

Dec. 31, 2012

Commitments and contingencies

Commitments and contingencies

10. Commitments and contingencies

        From April 2011 through April 2012, the Company leased office space from a significant stockholder. There was no formal lease arrangement with the stockholder.

        On May 1, 2012, the Company entered into a commercial building lease agreement. The sixty month lease, which commenced on August 10, 2012, provides for the lease by the Company of approximately 6,000 square feet of space in Cambridge, Massachusetts. Base annual rent is initially set at approximately $22,000 per month with an annual increase of 3%.

        Future minimum lease payments under this lease as of December 31, 2012 are as follows (in thousands):

Year
2013		267
2014		275
2015		284
2016		292
2017		173
	$	1,291

        Rent expense for the year ended December 31, 2012, for the period from April 5, 2011 (Inception) through December 31, 2011 and for the period from April 5, 2011 (Inception) through December 31, 2012 amounted to $176, 000, $41,000 and $217,000, respectively.