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Net Loss Per Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding dilutive securities not included in diluted loss per share calculation 11,737,837 10,366,645 11,737,837 10,366,645
Stock Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding dilutive securities not included in diluted loss per share calculation 11,494,722 10,123,530 11,494,722 10,123,530
Warrants to purchase common stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding dilutive securities not included in diluted loss per share calculation 243,115 243,115 243,115 243,115