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Net Loss Per Share (Details)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Convertible preferred stock
   
Net loss per share    
Amounts of potentially dilutive securities that excluded from the calculation of diluted net loss per share due to their anti-dilutive effect (in shares)   19,114,241
Outstanding stock options
   
Net loss per share    
Amounts of potentially dilutive securities that excluded from the calculation of diluted net loss per share due to their anti-dilutive effect (in shares) 2,942,927 1,775,593
Unvested restricted stock
   
Net loss per share    
Amounts of potentially dilutive securities that excluded from the calculation of diluted net loss per share due to their anti-dilutive effect (in shares) 78,015 224,019