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DEBT OBLIGATIONS (Details)
¥ in Thousands, $ in Thousands
9 Months Ended
Oct. 28, 2016
USD ($)
Sep. 30, 2018
CNY (¥)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Obligations          
Current borrowings       $ 437 $ 461
Long-term debt       62,021 52,694
Unamortized debt issuance costs       (459) (572)
Revolving Credit Facility          
Debt Obligations          
Long-term debt       $ 62,480 53,266
Maximum borrowing capacity $ 125,000        
Commitment fees on unused portion of the Revolving credit facility ( as a percent)   0.15% 0.15%    
Revolving Credit Facility | Minimum          
Debt Obligations          
Commitment fees on unused portion of the Revolving credit facility ( as a percent)   0.10% 0.10%    
Revolving Credit Facility | Maximum          
Debt Obligations          
Commitment fees on unused portion of the Revolving credit facility ( as a percent)   0.25% 0.25%    
Revolving Credit Facility | LIBOR          
Debt Obligations          
Applicable margin (as a percent)   1.50% 1.50%    
Revolving Credit Facility | LIBOR | Minimum          
Debt Obligations          
Applicable margin (as a percent) 1.00%        
Revolving Credit Facility | LIBOR | Maximum          
Debt Obligations          
Applicable margin (as a percent) 2.25%        
Revolving Credit Facility | Prime Rate          
Debt Obligations          
Applicable margin (as a percent)   0.50% 0.50%    
Revolving Credit Facility | Prime Rate | Minimum          
Debt Obligations          
Applicable margin (as a percent) 0.00%        
Revolving Credit Facility | Prime Rate | Maximum          
Debt Obligations          
Applicable margin (as a percent) 1.25%        
Term Loan          
Debt Obligations          
Effective rate (as a percent)   3.40%   3.40%  
Debt instrument term 5 years        
China Credit Facility          
Debt Obligations          
Current borrowings       $ 437 $ 461
Interest rate (as a percent)   4.90%   4.90%  
Maximum borrowing capacity   ¥ 10,000   $ 1,456  
Average outstanding borrowings   3,000 $ 460    
Available borrowing capacity   ¥ 7,000   $ 1,019