Common Stock - Summary of Reserved Shares of Common Stock for Future Issuances (Detail) - shares	Dec. 31, 2019	Dec. 31, 2018
Class Of Stock [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	3,253,969	2,835,101
Stock Compensation Plan [Member]
Class Of Stock [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	1,391,697	1,201,581
Options to purchase common stock [Member]
Class Of Stock [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	1,820,160	1,515,923
Restricted Stock Units [Member]
Class Of Stock [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	42,112	117,597