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Other Payables and Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Advance from customers $ 976 $ 1,036
Accrued wages and welfare 8,671 6,146
Other payables 12,311 9,272
Total other payables and accrued liabilities $ 21,958 $ 16,454