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Net Loss per Common Share - Anti-Dilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 3,081,089 1,147,860
Stock Options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 779,655 237,829
Unvested Restricted Shares [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 604,934 18,663
Warrants [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 1,696,500 891,368