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Commitments and Contingencies - Additional Information (Detail)
1 Months Ended 6 Months Ended
Apr. 30, 2021
ft²
Jul. 31, 2019
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Commitments And Contingencies [Line Items]          
Right-of-use asset     $ 279,000 $ 421,000 $ 600,000
Right-of-use liability     337,000    
Operating lease, short-term liability     $ 337,000 282,000  
Operating lease, long-term liability       175,000  
Operating lease, weighted average discount rate     9.00%    
Operating lease remaining term     11 months    
Facility Leases [Member]          
Commitments And Contingencies [Line Items]          
Right-of-use liability     $ 500,000    
Operating lease, long-term liability     $ 0 $ 200,000  
Redwood City, California [Member]          
Commitments And Contingencies [Line Items]          
Area of operating lease | ft² 6,368        
Operating lease, description     the Company executed a non-cancellable operating lease agreement for the same 6,368 square feet of space, which began in June 2021 and expires in May 2023.    
Operating lease beginning date 2021-06        
Operating lease, expiration 2023-05 2021-05      
Payment to acquire office furniture under operating lease   $ 1