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Organization and Description of Business - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Aug. 27, 2021
Aug. 09, 2021
Sep. 21, 2020
Aug. 22, 2020
Sep. 30, 2020
Dec. 31, 2022
Dec. 31, 2020
Dec. 31, 2021
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Issuance of Class C shares in connection with Google Private Placement             $ 99,100  
Description of the stock split arrangement           8.8-for-1.0    
Proceeds from issuance of common stock             $ 99,100  
Proceeds from private placement     $ 100,000          
Accumulated deficit           $ 1,082,028   $ 811,284
Common Class A [Member]                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Issue of common stocks, initial public offering         45,681,499      
Net proceeds from IPO         $ 767,568      
Underwriting discounts and commissions         $ 49,336      
Common Class C [Member]                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Issue of common stocks, initial public offering         5,555,555      
Issuance of Class C shares in connection with Google Private Placement       $ 100,000 $ 99,100 $ 99,100    
Issuance of Class C shares in connection with Google Private Placement, Shares       5,555,555        
Payments of stock issuance costs       $ 900 $ 900      
IPO [Member]                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Proceeds from issuance of common stock     $ 822,267          
IPO [Member] | Common Class A [Member]                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Issue of common stocks, initial public offering     45,681,499          
Shares issued, price per share     $ 18.00          
Net proceeds from IPO     $ 767,568          
Underwriting discounts and commissions     49,336          
Other offering costs     $ 4,906          
Convertible preferred stock, shares issued upon conversion     136,625,900          
Conversa Health Inc. [Member]                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Effective date of acquisition   Aug. 09, 2021            
Silver Cloud Health Holdings, Inc. [Member]                
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]                
Effective date of acquisition Aug. 27, 2021