Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Net Loss per Share (Details)

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Summary of Significant Accounting Policies - Net Loss per Share (Details) - shares
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Anti-dilutive securities    
Total shares excluded from diluted net loss per share applicable to common stockholders 2,771,115 2,540,830
Employee Stock options    
Anti-dilutive securities    
Total shares excluded from diluted net loss per share applicable to common stockholders 2,771,115 2,534,613
Restricted stock    
Anti-dilutive securities    
Total shares excluded from diluted net loss per share applicable to common stockholders   6,217