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Other Current Liability - Summary of Contract Liability (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Current contract liabilities      
Total current contract liabilities $ 216 $ 756 $ 113
Advance from customers      
Current contract liabilities      
Total current contract liabilities 93 668  
Custodial service      
Current contract liabilities      
Total current contract liabilities 63 71  
Transportation Service      
Current contract liabilities      
Total current contract liabilities $ 60 $ 17