Accrued Compensation (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Components of Accrued Compensation
Accrued social insurance	$ 17,727	$ 19,974
Accrued salary/wages	7,910	7,903
Accrued vacation/holiday	2,769	2,411
Accrued bonus	2,329	2,421
Accrued commission	1,089	933
Accrued medical insurance claims	286	122
Other accrued compensation	2,389	1,816
Total accrued compensation	34,499	35,580
Accrued salaries - 13th month salaries	$ 700	$ 700