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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 01, 2021
Jan. 16, 2020
Nov. 21, 2019
Nov. 30, 2016
Nov. 30, 2020
Nov. 30, 2016
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Related Party Transaction [Line Items]                        
Research and development expense             $ 14,028 $ 6,919     $ 32,104 $ 20,833
Capital contributions from related party                 $ 8,400 $ 9,595   17,995
Laboratory Equipment [Member]                        
Related Party Transaction [Line Items]                        
Purchased of equipment                     100  
Holdings [Member] | Series A Preferred Unit Purchase Agreement [Member]                        
Related Party Transaction [Line Items]                        
Gross proceeds from sale of equity           $ 35,600            
Capital contributions from related party           35,600            
Holdings [Member] | Series B Bridge Unit Purchase Agreement [Member]                        
Related Party Transaction [Line Items]                        
Capital contributions from related party     $ 10,000                  
Holdings [Member] | Second Series B Bridge Unit Purchase Agreement [Member]                        
Related Party Transaction [Line Items]                        
Capital contributions from related party   $ 11,400                    
Holdings [Member] | Series A and Series B [Member]                        
Related Party Transaction [Line Items]                        
Capital contributions from related party                       18,000
Maximum [Member] | Holdings [Member] | Series B Bridge Unit Purchase Agreement [Member]                        
Related Party Transaction [Line Items]                        
Gross proceeds from sale of equity     $ 10,000                  
Maximum [Member] | Holdings [Member] | Second Series B Bridge Unit Purchase Agreement [Member]                        
Related Party Transaction [Line Items]                        
Gross proceeds from sale of equity   $ 15,000                    
Consulting Agreement [Member]                        
Related Party Transaction [Line Items]                        
Amount to be paid for consulting services           $ 100            
Period of agreement       4 years                
Extented period of agreement         1 month              
Agreement expiration date         Dec. 31, 2020              
Consulting Agreement [Member] | Holdings [Member]                        
Related Party Transaction [Line Items]                        
Restricted common units granted           123,853            
Award vesting       30.00%                
Consulting Agreement [Member] | Future Services [Member] | Vests Over Forty Eight Months [Member]                        
Related Party Transaction [Line Items]                        
Award vesting       70.00%                
Consulting Agreement [Member] | Future Services [Member] | Remaining Restricted Common Units [Member]                        
Related Party Transaction [Line Items]                        
Vesting period of stock option       48 months                
Consulting Agreements [Member]                        
Related Party Transaction [Line Items]                        
Research and development expense                     $ 100 $ 100
Consulting Agreements [Member] | Maximum [Member]                        
Related Party Transaction [Line Items]                        
Research and development expense             $ 100 $ 100        
New Consulting Agreement [Member]                        
Related Party Transaction [Line Items]                        
Period of agreement 4 years