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Accrued Compensation (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Components of Accrued Compensation    
Accrued social insurance $ 17,216 $ 17,727
Accrued salary/wages 8,309 7,910
Accrued vacation/holiday 2,830 2,769
Accrued bonus 1,724 2,329
Accrued commission 935 1,089
Other accrued compensation 1,206 2,675
Total accrued compensation 32,220 34,499
Salaries accrued for thirteenth month $ 100 $ 700