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DEBT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 30, 2015
Capital lease obligations        
DEBT        
Company debt consisting of capital leases $ 1,100 $ 800    
Period over which monthly installments are payable 12 months      
Assets acquired under capital leases        
Interest expenses for capital lease obligations $ 70 30 $ 30  
Capital lease obligations | Assets acquired under capital leases        
Assets acquired under capital leases        
Net book value 4,500 3,600    
Accumulated depreciation 4,500 $ 4,400    
Comerica | Line of credit        
DEBT        
Maximum borrowing capacity       $ 10,000
Outstanding borrowings $ 0      
Comerica | Line of credit | Base (prime) rate        
DEBT        
Effective interest rate on borrowing base (prime) rate      
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        
DEBT        
Effective interest rate on borrowing London Interbank Offered Rates      
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      
Amount outstanding $ 0      
HSBC China | Line of credit | People's Bank of China        
DEBT        
Effective interest rate on borrowing People's Bank of China      
Multiplier for calculating effective rate from benchmark rate 1.05