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DEBT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Apr. 30, 2015
Line of credit        
DEBT        
Maximum borrowing capacity       $ 10,000
Outstanding borrowings $ 0      
Line of credit | Base (prime) rate        
DEBT        
Effective interest rate on borrowing base (prime) rate      
Line of credit | Base (prime) rate | Minimum        
DEBT        
Percentage to be subtracted to compute the variable rate on the debt instrument 1.00%      
Line of credit | Base (prime) rate | Maximum        
DEBT        
Percentage to be subtracted to compute the variable rate on the debt instrument 1.50%      
Line of credit | London Interbank Offered Rates        
DEBT        
Effective interest rate on borrowing London Interbank Offered Rates      
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%      
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%      
Capital lease obligations        
DEBT        
Company debt consisting of capital leases $ 800 $ 400    
Period over which monthly installments are payable 12 months      
Assets acquired under capital leases        
Interest expenses for capital lease obligations $ 30 30 $ 50  
Capital lease obligations | Assets acquired under capital leases        
Assets acquired under capital leases        
Net book value 3,600 3,700    
Accumulated depreciation 4,400 $ 3,500    
Standby letters of credit        
DEBT        
Maximum borrowing capacity 4,000      
Amount outstanding $ 0      
Standby letters of credit | Minimum        
DEBT        
Fee (as a percent) 1.00%      
Standby letters of credit | Maximum        
DEBT        
Fee (as a percent) 1.50%