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Stockholders' Equity - Summary of Common Stock Reserved for Future Issuance (Details) - shares
Jun. 30, 2021
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total common stock reserved for future issuance 6,622,710 4,195,805
Stock Options Issued and Outstanding    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total common stock reserved for future issuance 3,839,951 2,463,317
Warrants for Common Stock    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total common stock reserved for future issuance 1,366,141 80,428
Awards Available Under 2018 Equity Incentive Plan    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total common stock reserved for future issuance 605,524 1,039,531
Employee Stock Purchase Plan    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total common stock reserved for future issuance 811,094 612,529