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Net loss per share (Tables)
3 Months Ended
Mar. 31, 2014
Net loss per share  
Schedule of potentially anti-dilutive securities excluded from calculation of diluted net loss per share

 

 

 
  Three Months ended
March 31,
  Period from
August 4, 2010
(inception) to
March 31,
2014
 
 
  2014   2013  

Outstanding stock options

    3,719,831     1,987,012     3,719,831  

Unvested restricted stock

    224,852     642,569     224,852  

Unvested restricted stock units

    409,537     657,258     409,537