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Fair Value Measurement - Summary of Assets And Liabilities Measured At Fair Value (Detail) - Fair Value, Recurring - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Assets:    
Assets $ 459,778 $ 1,874
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 191,898 20,472
Cash, cash equivalents and restricted cash    
Assets:    
Assets 459,778 1,874
Level 1    
Assets:    
Assets 459,778 1,874
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 37,916 0
Level 1 | Cash, cash equivalents and restricted cash    
Assets:    
Assets 459,778 1,874
Level 2    
Assets:    
Assets 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 17,783 0
Level 2 | Cash, cash equivalents and restricted cash    
Assets:    
Assets 0 0
Level 3    
Assets:    
Assets 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 136,199 20,472
Level 3 | Cash, cash equivalents and restricted cash    
Assets:    
Assets 0 0
Assumed common stock warrants (Public)    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 37,916  
Assumed common stock warrants (Public) | Level 1    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 37,916  
Assumed common stock warrants (Public) | Level 2    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 0  
Assumed common stock warrants (Public) | Level 3    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 0  
Assumed common stock warrants (Private Placement)    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 17,783  
Assumed common stock warrants (Private Placement) | Level 1    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 0  
Assumed common stock warrants (Private Placement) | Level 2    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 17,783  
Assumed common stock warrants (Private Placement) | Level 3    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 0  
Earnout liability    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 136,199  
Earnout liability | Level 1    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 0  
Earnout liability | Level 2    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities 0  
Earnout liability | Level 3    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities $ 136,199  
Redeemable convertible preferred stock warrants liability    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities   19,233
Redeemable convertible preferred stock warrants liability | Level 1    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities   0
Redeemable convertible preferred stock warrants liability | Level 2    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities   0
Redeemable convertible preferred stock warrants liability | Level 3    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities   19,233
Derivative liability    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities   1,239
Derivative liability | Level 1    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities   0
Derivative liability | Level 2    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities   0
Derivative liability | Level 3    
Liabilities, Fair Value Disclosure [Abstract]    
Liabilities   $ 1,239