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Common Stock - Summary of Reserved Shares of Common Stock (Detail) - shares	Dec. 31, 2020	Jul. 08, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding convertible preferred stock converted into common shares		37,206,604	59,883,877
Shares reserved under the compensation plan	8,026,772		8,407,169
Total shares of common stock reserved for issuance	8,026,772		68,291,046
Series A Preferred Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding convertible preferred stock converted into common shares			16,002,820
Series B Preferred Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding convertible preferred stock converted into common shares			8,783,102
Series C Preferred Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding convertible preferred stock converted into common shares			35,097,955

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