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Stockholders' Equity - Shares Reserved For Future Issuances (Detail) - shares
Jun. 30, 2022
Dec. 31, 2021
Class Of Stock [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 74,310,805 55,139,084
Exercise of Common Stock Warrants and Pre-funded Warrants    
Class Of Stock [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 38,382,647 20,602,244
LPC Purchase Agreement [Member]    
Class Of Stock [Line Items]    
Common Stock, Capital Shares Reserved for Future Issuance 30,000,000 30,000,000
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 663,089 665,720
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 4,543,352 3,400,489
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 721,717 470,631