Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share - Additional Information (Details)

v3.10.0.1
Net Loss Per Share - Additional Information (Details) - shares
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of net loss per share 19,530,560 6,004,104
Early Exercised Shares of Common Stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of net loss per share 0 5,914