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Related Party Transactions - Additional Information (Detail) - Lessee Company Where Ceo of the Lessor Company is the Member of Board of Directors [Member]
$ in Thousands
9 Months Ended
Dec. 07, 2018
ft²
Sep. 30, 2021
Sep. 30, 2020
USD ($)
Apr. 01, 2019
ft²
Related Party Transaction [Line Items]        
Area of space subleased 400      
Revised area of space subleased       3,700
Sublease lease term extension   2 years    
Percentage of profit arising on sublease due to excess amount collected from subtenant to be shared       50.00%
Operating lease rental expense sublease rentals | $     $ 160