Stockholders' Equity (Deficit) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |
9 Months Ended | 12 Months Ended | |
|---|---|---|---|
Sep. 30, 2020 |
Dec. 31, 2020 |
Dec. 31, 2021 |
|
| Common stock, shares authorized | 22,701,005,000 | 22,701,005,000 | |
| Minimum ownership threshold | 100,000,000.0 | ||
| Dividends declared | $ 0 | ||
| Common Class A [Member] | |||
| Common stock, shares authorized | 20,000,000,000 | 20,000,000,000 | 20,000,000,000 |
| Number of shares sold in the transaction | 206,500,523 | ||
| Sale price per share | $ 4.65 | ||
| Proceeds from sale of equity | $ 942,500 | ||
| Payment of stock issuance cost | $ 17,700 | ||
| Common Class A [Member] | SOMPO [Member] | |||
| Number of shares sold in the transaction | 107,526,881 | ||
| Common Class B [Member] | |||
| Common stock, shares authorized | 2,700,000,000 | 2,700,000,000 | 2,700,000,000 |
| Number of shares issued for conversion | 335,000 | ||
| Common Class F [Member] | |||
| Common stock, shares authorized | 1,005,000 | 1,005,000 | 1,005,000 |
| Voting power | 50.00% |