Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Share - Anti-dilutive Outstanding Shares of Common Stock Equivalents Excluded from Computation of Diluted Net Loss per Share (Details)

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Net Loss Per Share - Anti-dilutive Outstanding Shares of Common Stock Equivalents Excluded from Computation of Diluted Net Loss per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of diluted net loss per share 2,368,346 12,426,267 2,368,346 12,426,267
Redeemable Convertible Preferred Stock on an if Converted Basis        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of diluted net loss per share   11,334,414   11,334,414
Stock Options to Purchase Common Stock        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of diluted net loss per share 2,177,666 734,663 2,177,666 734,663
Common stock subject to future vesting [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of diluted net loss per share 190,680 357,190 190,680 357,190