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Convertible Preferred Stock and Stockholders’ Equity (Deficit) - Summary of Stock Option Activity Under 2018 Plan and 2006 Plan (Details) - 2018 Employee Stock Purchase Plan - 2018 Plan and 2006 Plan
6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Shares    
Beginning balance (shares) | shares 1,282,847  
Granted (shares) | shares 545,374  
Exercised (shares) | shares (50,047)  
Canceled (shares) | shares (61,455)  
Ending balance (shares) | shares 1,716,719 1,282,847
Vested and exercisable (shares) | shares 566,997  
Weighted- Average Exercise Price    
Beginning balance (USD per share) | $ / shares $ 6.90  
Granted (USD per share) | $ / shares 4.15  
Exercised (USD per share) | $ / shares 1.30  
Canceled (USD per share) | $ / shares 15.06  
Ending balance (USD per share) | $ / shares 5.99 $ 6.90
Vested and exercisable (USD per share) | $ / shares $ 6.86  
Weighted- Average Remaining Contractual Term    
Outstanding 9 years 12 days 9 years 2 months 12 days
Vested and exercisable 8 years 4 months 24 days  
Aggregate Intrinsic Value    
Beginning balance | $  
Exercised | $  
Ending balance | $ 366,055
Vested and exercisable | $ $ 248,379