Equity Award Activity and Stock-Based Compensation - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | | |
Sep. 30, 2022 | Feb. 28, 2022 | Jan. 31, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | May 31, 2022 | Mar. 31, 2022 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Number of Options, Granted | | | | | | 8,000,000 | | | | |
Expected term | | | | | | 5 years 11 months 4 days | | | | |
Stock price volatility | | | | | | 75.53% | | | | |
Risk-free rate | | | | | | 2.28% | | | | |
Number of shares available for grant | 32,000,000 | | | 32,000,000 | | 32,000,000 | | | | |
Employee Stock Purchase Plan | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Share based compensation expense | | | | | | $ 1,000,000 | $ 3,000,000 | | | |
Additional stock based compensation expense | | | | | | $ 4 | | | | |
Percentage of price per share | | | | | | 85% | | | | |
Compensation expense recognition date | | | | | | May 20, 2024 | | | | |
Employee Stock Purchase Plan | Class A Common Stock | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Share-based payment award, description | | | | | | The ESPP provides for 24-month offering periods, generally beginning in November and May of each year, and each offering period consists of four six-month purchase periods. | | | | |
Percentage of eligible compensation to purchase shares at discount | 15% | | | 15% | | 15% | | | | |
Maximum eligible compensation to purchase shares at discount | | | | | | $ 25,000 | | | | |
Maximum number of shares eligible to purchase by an employee on purchase date | | | | | | 2,500 | | | | |
2022 Inducement Plan | Class A Common Stock | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Aggregate number of shares reserved for issuance | | | | | | | | | 27,000,000 | 12,000,000 |
Number of shares available for grant | 16,000,000 | | | 16,000,000 | | 16,000,000 | | | | |
Mr. Vijay Talwar | Class A Common Stock | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Options, Grant date Fair Value | | | $ 12,000,000 | | | | | | | |
Mr. Vijay Talwar | 2022 Employee Stock Purchase Plan | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Vesting period | | | 4 years | | | | | | | |
Term of option award | | | 10 years | | | | | | | |
Share based compensation expense | $ 6,000,000 | | | | | | | | | |
Mr. Vijay Talwar | 2022 Employee Stock Purchase Plan | Class A Common Stock | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Number of Options, Granted | | | 6,000,000 | | | | | | | |
Exercise price | | | $ 2.86 | | | | | | | |
Mr. Jun Yan | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Percentage of RSU vest upon termination of interim CEO within six months from commencement of employment | | | | | | 50% | | | | |
Percentage of Option vest upon termination of interim CEO within six months from commencement of employment | | | | | | 50% | | | | |
Mr. Jun Yan | 2022 Employee Stock Purchase Plan | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Vesting period | 1 year | | | | | | | | | |
Term of option award | 10 years | | | | | | | | | |
Mr. Jun Yan | 2022 Employee Stock Purchase Plan | Class A Common Stock | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Options, Grant date Fair Value | $ 1,000,000 | | | | | | | | | |
Number of Options, Granted | 2,000,000 | | | | | | | | | |
Exercise price | $ 0.86 | | | | | | | | | |
Maximum | Employee Stock Purchase Plan | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Common stock shares purchased | | | | | | 1,000,000 | 1,000,000 | | | |
Restricted Stock Units ("RSUs") | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Weighted average grant date fair value, granted | | | | $ 1.49 | $ 7.75 | $ 1.80 | $ 11.15 | | | |
Unvested share outstanding | | | | | | 78,000,000 | | | | |
Unrecognized compensation expenses | $ 185,000,000 | | | $ 185,000,000 | | $ 185,000,000 | | | | |
Unrecognized compensation expenses, recognition period | | | | | | 2 years 6 months | | | | |
Restricted Stock Units ("RSUs") | Mr. Vijay Talwar | 2022 Employee Stock Purchase Plan | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Restricted stock units, granted date fair value | | | $ 13,000,000 | | | | | | | |
Number of Options, Granted | | | 5,000,000 | | | | | | | |
Restricted Stock Units ("RSUs") | Mr. Jun Yan | 2022 Employee Stock Purchase Plan | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Restricted stock units, granted date fair value | $ 2,000,000 | | | | | | | | | |
Number of Options, Granted | 2,000,000 | | | | | | | | | |
Performance Stock Units ("PSUs") | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Unvested share outstanding | | | | | | | | 11,000,000 | | |
Performance Stock Units ("PSUs") | Executive Chair | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Stock-based compensation expense reversal amount | | $ 3,000,000 | | | | | | | | |
Performance stock units, modified fair value | | $ 2,000,000 | | | | | | | | |
Performance Stock Units ("PSUs") | Chief Executive Officer [Member] | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Stock-based compensation expense reversal amount | | | $ 21,000,000 | | | | | | | |
Stock Options | | | | | | | | | | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | | | | | | | | | | |
Unrecognized compensation expenses | $ 1,000,000 | | | $ 1,000,000 | | $ 1,000,000 | | | | |
Unrecognized compensation expenses, recognition period | | | | | | 1 year | | | | |