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Leases - Additional Information (Detail)
$ in Thousands
12 Months Ended
Sep. 30, 2020
USD ($)
Lease
Oct. 31, 2019
Sep. 30, 2019
USD ($)
Lessee Lease Description [Line Items]      
Number of Leases | Lease 2    
Lease option to extend two options to extend the lease term for an additional three years each.    
Lease periods commencing upon shipment   18 months  
Outstanding letter of credit $ 608    
Cash and investment restricted as a collateral for outstanding letter of credit $ 608   $ 608
First Lease [Member] | 500 Arsenal Street, Watertown, Massachusetts [Member]      
Lessee Lease Description [Line Items]      
Office lease expiration period 2022-09    
Lease option to extend an option to extend the lease term for an additional five years.    
Second Lease [Member] | 400 Talcott Avenue, Watertown, Massachusetts [Member]      
Lessee Lease Description [Line Items]      
Office lease expiration period 2024-08    
Period of lease agreement 2018-09