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Earnout Liability - Narrative (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Business Acquisition, Contingent Consideration [Line Items]          
Post triggering event period     10 days    
Earnout shares of common stock outstanding (in shares) | shares 25,000,000   25,000,000    
Sponsor vesting shares of common stock outstanding (in shares) | shares 4,500,000   4,500,000    
Change in fair value of earnout liability | $ $ 21,511 $ 0 $ 67,008 $ 0  
Earnout liability          
Business Acquisition, Contingent Consideration [Line Items]          
Earn-out liability | $ 136,000   $ 136,000   $ 0
Change in fair value of earnout liability | $ $ 21,500        
Earnout liability | Dividend yield          
Business Acquisition, Contingent Consideration [Line Items]          
Measurement input 0   0    
Earnout liability | Expected volatility          
Business Acquisition, Contingent Consideration [Line Items]          
Measurement input 0.63   0.63    
Earnout liability | Risk-free interest rate          
Business Acquisition, Contingent Consideration [Line Items]          
Measurement input 0.0087   0.0087    
Earnout liability | Share trigger price 1          
Business Acquisition, Contingent Consideration [Line Items]          
Post triggering event period     10 days    
Share price (in dollars per share) | $ / shares $ 15.00   $ 15.00    
Period from businees combination closing date stock price trigger     3 years    
Earnout liability | Share trigger price 2          
Business Acquisition, Contingent Consideration [Line Items]          
Post triggering event period     10 days    
Share price (in dollars per share) | $ / shares 20.00   $ 20.00    
Period from businees combination closing date stock price trigger     4 years    
Earnout liability | Share trigger price 3          
Business Acquisition, Contingent Consideration [Line Items]          
Post triggering event period     10 days    
Share price (in dollars per share) | $ / shares $ 25.00   $ 25.00    
Period from businees combination closing date stock price trigger     5 years