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Accrued Compensation (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Components of Accrued Compensation    
Accrued bonus $ 7,602 $ 13,965
Accrued commission 1,779 1,283
Accrued salary/wages 7,107 7,465
Accrued social insurance 7,375 16,588
Accrued vacation/holiday 3,307 2,766
Other accrued compensation 1,761 1,601
Total accrued compensation $ 28,931 $ 43,668