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Summary of Significant Accounting Policies - Antidilutive Securities Excluded from Computation of Earnings per Share (Details) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities (in shares)   14,033
Warrants | Warrants to purchase Series C-1 Preferred    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities (in shares) 14,033  
Warrants | June 2016 Public Offering    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities (in shares) 4,218,750 0
Warrants | Warrants Associated with Loan Agreement    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities (in shares) 122,435 0
Stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive securities (in shares) 1,819,444 1,379,727