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Accrued Compensation (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Components of Accrued Compensation    
Accrued social insurance $ 16,709 $ 16,735
Accrued salary/wages 8,641 8,783
Accrued vacation/holiday 2,971 2,954
Accrued bonus 5,208 2,361
Accrued commission 815 1,432
Other accrued compensation 1,993 1,700
Total accrued compensation 36,337 33,965
Salaries accrued for thirteenth month $ 600 $ 400