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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Jul. 21, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Liabilities: |  |  |
Derivative liabilities, current | $ 547 |  | $ 0
Derivative warrant liabilities | 35,069 |  | 0
Other |  |  |
Liabilities: |  |  |
Liabilities, noncurrent | 2,205 |  | 4,343
Class B Units |  |  |
Liabilities: |  |  |
Liabilities, noncurrent | 0 |  | 593,235
Recurring |  |  |
Assets: |  |  |
Total assets | 42,800 |  | 25,016
Liabilities: |  |  |
Total liabilities | 37,821 |  | 597,578
Recurring | Public Warrants |  |  |
Liabilities: |  |  |
Derivative warrant liabilities | 23,402 |  |
Recurring | Private Warrants |  |  |
Liabilities: |  |  |
Derivative warrant liabilities | 11,667 |  |
Recurring | Other |  |  |
Liabilities: |  |  |
Derivative liabilities, current | 547 |  |
Liabilities, noncurrent | 2,205 |  | 4,343
Recurring | Class B Units |  |  |
Liabilities: |  |  |
Liabilities, noncurrent |  |  | 593,235
Recurring | Money market funds |  |  |
Assets: |  |  |
Money market funds | 42,800 |  | 25,016
Level 1 | Recurring |  |  |
Assets: |  |  |
Total assets | 42,800 |  | 25,016
Liabilities: |  |  |
Total liabilities | 23,402 |  | 0
Level 1 | Recurring | Public Warrants |  |  |
Liabilities: |  |  |
Derivative warrant liabilities | 23,402 |  |
Level 1 | Recurring | Private Warrants |  |  |
Liabilities: |  |  |
Derivative warrant liabilities | 0 |  |
Level 1 | Recurring | Other |  |  |
Liabilities: |  |  |
Derivative liabilities, current | 0 |  |
Liabilities, noncurrent | 0 |  | 0
Level 1 | Recurring | Class B Units |  |  |
Liabilities: |  |  |
Liabilities, noncurrent |  |  | 0
Level 1 | Recurring | Money market funds |  |  |
Assets: |  |  |
Money market funds | 42,800 |  | 25,016
Level 2 | Recurring |  |  |
Assets: |  |  |
Total assets | 0 |  | 0
Liabilities: |  |  |
Total liabilities | 0 |  | 0
Level 2 | Recurring | Public Warrants |  |  |
Liabilities: |  |  |
Derivative warrant liabilities | 0 |  |
Level 2 | Recurring | Private Warrants |  |  |
Liabilities: |  |  |
Derivative warrant liabilities | 0 |  |
Level 2 | Recurring | Other |  |  |
Liabilities: |  |  |
Derivative liabilities, current | 0 |  |
Liabilities, noncurrent | 0 |  | 0
Level 2 | Recurring | Class B Units |  |  |
Liabilities: |  |  |
Liabilities, noncurrent |  |  | 0
Level 2 | Recurring | Money market funds |  |  |
Assets: |  |  |
Money market funds | 0 |  | 0
Level 3 | Recurring |  |  |
Assets: |  |  |
Total assets | 0 |  | 0
Liabilities: |  |  |
Total liabilities | 14,419 |  | 597,578
Level 3 | Recurring | Public Warrants |  |  |
Liabilities: |  |  |
Derivative warrant liabilities | 0 |  |
Level 3 | Recurring | Private Warrants |  |  |
Liabilities: |  |  |
Derivative warrant liabilities | 11,667 |  |
Level 3 | Recurring | Other |  |  |
Liabilities: |  |  |
Derivative liabilities, current | 547 |  |
Liabilities, noncurrent | 2,205 |  | 4,343
Level 3 | Recurring | Class B Units |  |  |
Liabilities: |  |  |
Liabilities, noncurrent |  | $ 45,021 | 593,235
Level 3 | Recurring | Money market funds |  |  |
Assets: |  |  |
Money market funds | $ 0 |  | $ 0

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