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Convertible Preferred Stock and Common stock - Summary of Common Stock Reserved For Issuance (Detail) - shares	Mar. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Common stock reserved for issuance	374,015,355	346,016,510
Convertible preferred stock outstanding [Member]
Class of Stock [Line Items]
Common stock reserved for issuance	223,033,725	238,954,050
Options issued and outstanding [Member]
Class of Stock [Line Items]
Common stock reserved for issuance	59,603,390	62,827,150
Restricted stock units issued and outstanding [Member]
Class of Stock [Line Items]
Common stock reserved for issuance	50,272,925	32,556,160
Shares available for future stock-based incentive award issuances [Member]
Class of Stock [Line Items]
Common stock reserved for issuance	41,105,315	11,679,150