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DEBT (Details) - USD ($)
$ in Thousands
1 Months Ended
Apr. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Feb. 28, 2018
DEBT        
Finance Leases   $ 823 $ 1,485  
Assets acquired under capital leases        
Finance leases   2,120 $ 2,632  
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       $ 15,000
Interest rate (as a percent)   5.50%