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Summary of Significant Accounting Policies - Basic and Diluted Loss Per Common Share (Details) - shares
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Stock options    
Anti-dilutive securities    
Outstanding securities not included in the computation of diluted net loss per common share as their inclusion would be anti-dilutive (in shares) 1,123,582 991,711
Unvested Restricted Common Stock    
Anti-dilutive securities    
Outstanding securities not included in the computation of diluted net loss per common share as their inclusion would be anti-dilutive (in shares) 52,063 105,199
Preferred Stock    
Anti-dilutive securities    
Outstanding securities not included in the computation of diluted net loss per common share as their inclusion would be anti-dilutive (in shares) 1,969,797 1,969,797