Stockholders' Equity - Shares Reserved For Future Issuances (Detail) - shares	Mar. 31, 2022	Dec. 31, 2021
Class Of Stock [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	54,264,374	55,139,084
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	755,689	470,631