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Accrued Compensation (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Components of Accrued Compensation    
Accrued social insurance $ 16,866 $ 16,735
Accrued salary/wages 8,631 8,783
Accrued vacation/holiday 3,168 2,954
Accrued bonus 2,263 2,361
Accrued commission 541 1,432
Other accrued compensation 2,395 1,700
Total accrued compensation 33,864 33,965
Salaries accrued for thirteenth month $ 300 $ 400