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Net Loss Per Share - Summary of Potentially Dilutive Shares of Common Stock (Details) - shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,971,447 1,598,306
Outstanding stock options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 175,041 170,016
Unvested restricted stock units    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 56,458 89,575
Warrants to purchase common stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,739,948 1,338,715