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Commitments and Contingencies - Schedule of Future Minimum Rental Payments for Operating Leases (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]    
2022 $ 55  
2023 73  
2024 62  
Total remaining lease payments 190  
Less: imputed interest (20)  
Total operating lease liabilities 170 $ 108
Less: current portion (44)  
Long-term operating lease liabilities $ 126 $ 0
Weighted-average remaining lease term (in years) 2 years 9 months 18 days  
Weighted-average discount rate 8.00%