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Commitments and Contingencies - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Nov. 30, 2020
USD ($)
Aug. 30, 2018
ft²
Apr. 30, 2018
USD ($)
Apr. 30, 2015
ft²
Other Commitments [Line Items]                
Operating lease future minimum payments due [1] $ 9,916,000   $ 9,916,000          
Operating lease minimum future commitments 7,925,000   7,925,000          
PNAI [Member]                
Other Commitments [Line Items]                
Operating lease minimum future commitments         $ 9,916,000      
Operating lease, rent expense 0 $ 535,000 0 $ 1,605,000        
PNAI [Member] | Research And Laboratory Equipment [Member]                
Other Commitments [Line Items]                
Operating lease, rent expense 0   0 $ 256,000        
PNAI [Member] | Office and Laboratory Space at Woborn Massauchets [Member]                
Other Commitments [Line Items]                
Area of real estate availed on lease | ft²           24,606   3,800
Operating lease term           84 months   39 months
Operating lease renewal term           3 years    
Letters of credit outstanding             $ 293,000  
Operating lease future minimum payments due $ 9,916,000   $ 9,916,000          
Operating lease minimum future commitments         $ 7,925,000      
[1] Future minimum lease payments include repayment of outstanding restructuring liabilities.