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