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Employee benefit plan
12 Months Ended
Dec. 31, 2012
Employee benefit plan  
Employee benefit plan

14. Employee benefit plan

        In January 2012, the Company adopted a 401(k) retirement and savings plan (the "401(k) Plan") covering all employees. The 401(k) Plan allows employees to make pre-tax contributions up to the maximum allowable amount set by the Internal Revenue Service. Under the 401(k) Plan, the Company may make discretionary contributions as approved by the board of directors. During the year ended December 31, 2012 and for the period from April 5, 2011 (Inception) through December 31, 2012, the Company made contributions to the 401(k) Plan of $52,000. No contributions were made during 2011.