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Leases - Summary of Lease, Cost (Detail) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating leases    
Operating lease cost $ 38,000  
Less: sublease income (16,000) $ (9,000)
Operating lease expense 22,000  
Short-term lease rent expense 5,000  
Total rent expense $ 27,000 $ 27,000