Quarterly report pursuant to Section 13 or 15(d)

Redeemable Convertible Preferred Stock - Schedule of Common Stock Reserved for Future Issuance (Details)

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Redeemable Convertible Preferred Stock - Schedule of Common Stock Reserved for Future Issuance (Details) - shares
Sep. 30, 2018
Sep. 25, 2018
Temporary Equity [Line Items]    
Redeemable convertible preferred stock 16,028,462  
Common stock options issued and outstanding 3,383,756  
Warrants to purchase redeemable convertible preferred stock 117,400  
Warrants to purchase common stock 942  
Total 22,107,783  
2018 Equity Incentive Plan    
Temporary Equity [Line Items]    
Remaining shares reserved for issuance under 2018 Equity Incentive Plan 2,577,223  
Total   2,300,000