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Other Current Liability - Summary of Contract Liability (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current contract liabilities      
Total current contract liabilities $ 612 $ 259 $ 216
Advance from customers      
Current contract liabilities      
Total current contract liabilities 511 156 93
Custodial service      
Current contract liabilities      
Total current contract liabilities 50 44 63
Transportation Service      
Current contract liabilities      
Total current contract liabilities $ 51 $ 59 $ 60