Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share - Schedule of Antidilutive Shares Excluded from Calculation of Diluted Net Loss Per Share (Details)

v3.19.3
Net Loss Per Share - Schedule of Antidilutive Shares Excluded from Calculation of Diluted Net Loss Per Share (Details) - shares
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive shares have been excluded from calculation of diluted net loss per share 22,919,018 2,386,858
Convertible Preferred Stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive shares have been excluded from calculation of diluted net loss per share 19,356,835  
Stock Options to Purchase Common Stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive shares have been excluded from calculation of diluted net loss per share 1,942,411  
Non-vested Common Stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive shares have been excluded from calculation of diluted net loss per share 1,619,772 2,386,858