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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 12, 2018
Aug. 31, 2018
Aug. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Commitments And Contingencies Disclosure [Line Items]          
Lease agreement expiration date Jan. 31, 2023        
Percentage of annual increase in rent 3.00%        
Tenant incentive allowance $ 842        
Security deposit in connection with lease       $ 209 $ 209
Rent expense       2,257 1,295
Sub-lease Agreement [Member]          
Commitments And Contingencies Disclosure [Line Items]          
Lease agreement expiration date   Oct. 31, 2020 Aug. 31, 2020    
Percentage of annual increase in rent   3.00% 3.00%    
Security deposit in connection with lease       $ 283 $ 283