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Convertible Preferred Stock and Common stock - Schedule of Stock by Class (Detail) - shares | Mar. 31, 2021 | Dec. 31, 2020
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Class of Stock [Line Items] |  |
Shares Authorized | 1,371,373,770 | 700,754,910
Shares Issued | 146,102,070 | 125,221,900
Shares Outstanding | 143,852,070 | 122,971,900
Class A common stock [Member] |  |
Class of Stock [Line Items] |  |
Shares Authorized | 1,000,754,910 | 530,136,050
Shares Issued | 126,295,420 | 118,549,390
Shares Outstanding | 124,045,420 | 116,299,390
Class B common stock [Member] |  |
Class of Stock [Line Items] |  |
Shares Authorized | 270,618,860 | 170,618,860
Shares Issued | 4,562,160 | 6,672,510
Shares Outstanding | 4,562,160 | 6,672,510
Class C common stock [Member] |  |
Class of Stock [Line Items] |  |
Shares Authorized | 100,000,000 |
Shares Issued | 15,244,490 |
Shares Outstanding | 15,244,490 |

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