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DEBT (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Feb. 01, 2017
USD ($)
Capital lease obligations          
DEBT          
Company debt consisting of capital leases   $ 1,300 $ 1,100    
Assets acquired under capital leases          
Interest expenses for capital lease obligations   80 70 $ 30  
Capital lease obligations | Assets acquired under capital leases          
Assets acquired under capital leases          
Net book value   5,300 4,500    
Accumulated depreciation   4,200 4,500    
Comerica | Line of credit          
DEBT          
Maximum borrowing capacity $ 10,000        
Outstanding borrowings   0      
Comerica | Line of credit | Base (prime) rate | Minimum          
DEBT          
Percentage to be subtracted to compute the variable rate on the debt instrument 1.00%        
Comerica | Line of credit | Base (prime) rate | Maximum          
DEBT          
Percentage to be subtracted to compute the variable rate on the debt instrument 1.50%        
Comerica | Line of credit | London Interbank Offered Rates | Minimum          
DEBT          
Percentage that needs to be added to compute the variable rate on the debt instrument 1.25%        
Comerica | Line of credit | London Interbank Offered Rates | Maximum          
DEBT          
Percentage that needs to be added to compute the variable rate on the debt instrument 1.75%        
Comerica | Standby letters of credit          
DEBT          
Maximum borrowing capacity $ 4,000        
Amount outstanding   0      
Comerica | Standby letters of credit | Minimum          
DEBT          
Fee (as a percent) 1.00%        
Comerica | Standby letters of credit | Maximum          
DEBT          
Fee (as a percent) 1.50%        
HSBC China | Line of credit          
DEBT          
Maximum borrowing capacity     $ 4,000   $ 9,000
Amount outstanding   $ 6,000      
HSBC China | Line of credit | People's Bank of China          
DEBT          
Multiplier for calculating effective rate from benchmark rate   1.10