Common Stock - Summary of Reserved Shares of Common Stock for Future Issuances (Detail) - shares	Dec. 31, 2020	Dec. 31, 2019
Class Of Stock [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	3,774,712	3,253,969
Stock Compensation Plan [Member]
Class Of Stock [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	1,600,703	1,391,697
Options to purchase common stock [Member]
Class Of Stock [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	2,173,776	1,820,160
Restricted Stock Units [Member]
Class Of Stock [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	233	42,112