Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Changes in Fair Value of the Derivative Warrant Liabilities (Detail)

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Summary of Significant Accounting Policies - Summary of Changes in Fair Value of the Derivative Warrant Liabilities (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Contingent Earnout Liability [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in fair value $ (42,710)  
Recognition of liability 123,129  
Balance at end of year 80,419  
Private Placement Warrant Liability [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in fair value (1,418)  
Recognition of liability 5,702  
Balance at end of year 4,284  
SVB Warrant Liability [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of year 545 $ 370
Change in fair value 1,248 79
Exercise of common stock warrants $ 1,793  
Balance at end of year   $ 449