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Commitments - Additional Information (Detail)
3 Months Ended 9 Months Ended
Aug. 09, 2021
Oct. 27, 2020
Aug. 04, 2020
May 28, 2020
USD ($)
ft²
Aug. 08, 2019
Nov. 05, 2018
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Other Commitments [Line Items]                        
Milestone expenses             $ 0   $ 0      
Milestone payments due             0   0      
Operating lease right-of-use assets             3,540,000   3,540,000   $ 3,936,000  
Operating lease liability             $ 6,139,000   $ 6,139,000      
Weighted average remaining lease term in years             7 years 10 months 24 days   7 years 10 months 24 days   8 years 7 months 6 days  
Weighted average discount rate             11.00%   11.00%   11.00%  
Lease expenses             $ 100,000 $ 300,000 $ 200,000 $ 400,000    
Pennsylvania [Member] | Office [Member]                        
Other Commitments [Line Items]                        
Operating lease term         3 years 6 months              
Lease extension period         3 years              
Operating lease right-of-use assets                       $ 400,000
Operating lease liability                       $ 400,000
Lease term commencement date         Feb. 15, 2020              
Pennsylvania [Member] | Office and Lab [Member]                        
Other Commitments [Line Items]                        
Lease extension period           2 years            
Lease term commencement date           Jan. 01, 2019            
Lease term expiration date Dec. 31, 2022   Dec. 31, 2021     Dec. 31, 2020            
Massachusetts [Member] | Office [Member]                        
Other Commitments [Line Items]                        
Area of office space | ft²       17,705                
Massachusetts [Member] | Office [Member] | Letter of Credit                        
Other Commitments [Line Items]                        
Letter of credit       $ 1,300,000                
Massachusetts [Member] | Office Sublease [Member]                        
Other Commitments [Line Items]                        
Lease term expiration date   Oct. 30, 2029                    
Massachusetts [Member] | First Sublease Year [Member] | Office Sublease [Member]                        
Other Commitments [Line Items]                        
Annual base rent             800,000   800,000      
Massachusetts [Member] | First Sublease Year [Member] | Office Sublease [Member] | Letter of Credit                        
Other Commitments [Line Items]                        
Lease security deposits letters of credit             800,000   800,000      
Massachusetts [Member] | Final Sublease Year [Member] | Office Sublease [Member]                        
Other Commitments [Line Items]                        
Annual base rent             1,000,000.0   1,000,000.0      
Massachusetts [Member] | Sixth Sublease Year | Office Sublease [Member] | Letter of Credit                        
Other Commitments [Line Items]                        
Lease security deposits letters of credit             $ 400,000   $ 400,000      
WFUHS [Member]                        
Other Commitments [Line Items]                        
License agreement consideration deduction percentage             60.00%   60.00%      
WFUHS [Member] | Maximum [Member]                        
Other Commitments [Line Items]                        
Milestone payments             $ 2,600,000   $ 2,600,000      
IU [Member]                        
Other Commitments [Line Items]                        
License agreement consideration deduction percentage             20.00%   20.00%      
IU [Member] | Maximum [Member]                        
Other Commitments [Line Items]                        
Milestone payments             $ 2,600,000   $ 2,600,000      
Annual royalty pay obligation             $ 100,000   $ 100,000