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DEBT (Details) - USD ($)
$ in Thousands
1 Months Ended
Jun. 30, 2017
Dec. 31, 2019
Feb. 28, 2018
DEBT      
Company debt consisting of capital leases   $ 1,485  
Assets acquired under capital leases      
Finance leases   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%