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Stockholders' Equity - Shares Reserved For Future Issuances (Detail) - shares
Jun. 30, 2021
Dec. 31, 2020
Class Of Stock [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 4,564,406 3,646,200
2012 Stock Option And Grant Plan [Member] | 2012 Stock Incentive Plan [Member]    
Class Of Stock [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 885,418 921,824
2019 Stock Option And Grant Plan [Member] | 2019 Stock Incentive Plan [Member]    
Class Of Stock [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 3,175,199 2,396,922
2019 Stock Option And Grant Plan [Member] | 2019 Employee Stock Purchase Plan [Member]    
Class Of Stock [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 503,789 327,454