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Common Stock - Summary of Reserved Shares of Common Stock (Detail) - shares | Dec. 31, 2020 | Jul. 08, 2020 | Dec. 31, 2019
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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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